电机控制脉宽调制器 (MCPWM)

[English]

MCPWM 外设是一个多功能 PWM 生成器,集成多个子模块,在电力电子应用(如电机控制、数字电源等)中至关重要。MCPWM 外设通常适用于以下场景:

  • 数字电机控制,如有刷/无刷直流电机、RC 伺服电机

  • 基于开关模式的数字电源转换

  • 功率数模转换器 (Power DAC),其中占空比等于 DAC 的模拟值

  • 计算外部脉宽,并将其转换为其他模拟值,如速度、距离

  • 为磁场定向控制 (FOC) 生成空间矢量调制 (SVPWM) 信号

外设的主要子模块如下图所示:

MCPWM 概述

  • MCPWM 定时器模块:最终输出 PWM 信号的时间基准。它也决定了其他子模块的事件时序。

  • MCPWM 操作器模块:生成 PWM 波形的关键模块。它由其他子模块组成,如比较器、PWM 生成器、死区生成器和载波调制器。

  • MCPWM 比较器模块:输入时间基准值,并不断与配置的阈值进行比较。当定时器计数值等于任何一个阈值时,生成一个比较事件,MCPWM 生成器随即相应更新其电平。

  • MCPWM 生成器模块:根据 MCPWM 定时器、MCPWM 比较器等子模块触发的各种事件,生成一对独立或互补的 PWM 波形。

  • MCPWM 故障检测模块:通过 GPIO 交换矩阵检测外部的故障情况。检测到故障信号时,MCPWM 操作器将强制所有生成器进入预先定义的状态,从而保护系统。

  • MCPWM 同步模块:同步 MCPWM 定时器,以确保由不同的 MCPWM 生成器最终生成的 PWM 信号具有固定的相位差。可以通过 GPIO 交换矩阵和 MCPWM 定时器事件生成同步信号。

  • 死区生成器模块:在此前生成的 PWM 边沿上插入额外的延迟。

  • 载波模块:可通过 PWM 波形生成器和死区生成器,将一个高频载波信号调制为 PWM 波形,这是控制功率开关器件的必需功能。

  • 制动控制:MCPWM 操作器支持配置检测到特定故障时生成器的制动控制方式。根据故障的严重程度,可以选择立即关闭或是逐周期调节 PWM 输出。

  • MCPWM 捕获模块:独立子模块,不依赖于上述 MCPWM 操作器工作。捕获模块包括一个专用的定时器和几个独立的通道,每个通道都与 GPIO 相连。GPIO 上的脉冲触发捕获定时器以存储时间基准值,随后通过中断进行通知。此模块有助于更加精准地测量脉宽。此外,捕获定时器也可以通过 MCPWM 同步子模块进行同步。

功能概述

下文将分节概述 MCPWM 的功能:

资源配置及初始化

如上图所示,MCPWM 外设由数个子模块组成。本节将介绍各个子模块的资源配置方式。

MCPWM 定时器

调用 mcpwm_new_timer() 函数,以配置结构体 mcpwm_timer_config_t 为参数,分配一个 MCPWM 定时器为对象。结构体定义为:

分配成功后,mcpwm_new_timer() 将返回一个指向已分配定时器的指针。否则,函数将返回错误代码。具体来说,当 MCPWM 组中没有空闲定时器时,将返回 ESP_ERR_NOT_FOUND 错误。1

反之,调用 mcpwm_del_timer() 函数将释放已分配的定时器。

MCPWM 操作器

调用 mcpwm_new_operator()() 函数,以配置结构体 mcpwm_operator_config_t 为参数,分配一个 MCPWM 操作器为对象。结构体定义为:

分配成功后,mcpwm_new_operator()() 将返回一个指向已分配操作器的指针。否则,函数将返回错误代码。具体来说,当 MCPWM 组中没有空闲操作器时,将返回 ESP_ERR_NOT_FOUND 错误。1

反之,调用 mcpwm_del_operator()() 函数将释放已分配的操作器。

MCPWM 比较器

调用 mcpwm_new_comparator() 函数,以一个 MCPWM 操作器句柄和配置结构体 mcpwm_comparator_config_t 为参数,分配一个 MCPWM 比较器为对象。操作器句柄由 mcpwm_new_operator()() 生成,结构体定义为:

分配成功后,mcpwm_new_comparator() 将返回一个指向已分配比较器的指针。否则,函数将返回错误代码。具体来说,当 MCPWM 操作器中没有空闲比较器时,将返回 ESP_ERR_NOT_FOUND 错误。1

反之,调用 mcpwm_del_comparator() 函数将释放已分配的比较器。

MCPWM 生成器

调用 mcpwm_new_generator() 函数,以一个 MCPWM 操作器句柄和配置结构体 mcpwm_generator_config_t 为参数,分配一个 MCPWM 生成器为对象。操作器句柄由 mcpwm_new_operator()() 生成,结构体定义为:

分配成功后,mcpwm_new_generator() 将返回一个指向已分配生成器的指针。否则,函数将返回错误代码。具体来说,当 MCPWM 操作器中没有空闲生成器时,将返回 ESP_ERR_NOT_FOUND 错误。1

反之,调用 mcpwm_del_generator() 函数将释放已分配的生成器。

MCPWM 故障

MCPWM 故障分为两种类型:来自 GPIO 的故障信号和软件故障。

调用 mcpwm_new_gpio_fault() 函数,以配置结构体 mcpwm_gpio_fault_config_t 为参数,分配一个 GPIO 故障为对象。结构体定义为:

分配成功后,mcpwm_new_gpio_fault() 将返回一个指向已分配故障的指针。否则,函数将返回错误代码。具体来说,当指定 MCPWM 组中没有空闲 GPIO 故障时,将返回 ESP_ERR_NOT_FOUND 错误。1

调用函数 mcpwm_soft_fault_activate() 使一个软件故障对象触发故障,无需等待来自 GPIO 的真实故障信号。调用 mcpwm_new_soft_fault() 函数,以配置结构体 mcpwm_soft_fault_config_t 为参数,分配一个软件故障为对象。该结构体暂时保留,供后续使用。

分配成功后,mcpwm_new_soft_fault() 将返回一个指向已分配故障的指针。否则,函数将返回错误代码。具体来说,当内存不足以支持该故障对象时,将返回 ESP_ERR_NO_MEM 错误。虽然软件故障和 GPIO 故障是不同类型的故障,但返回的故障句柄为同一类型。

反之,调用 mcpwm_del_fault() 函数将释放已分配的故障。此函数同时适用于软件故障和 GPIO 故障。

MCPWM 同步源

同步源用于同步 MCPWM 定时器和 MCPWM 捕获定时器,分为三种类型:来自 GPIO 的同步源、软件生成的同步源和 MCPWM 定时器事件生成的同步源。

调用 mcpwm_new_gpio_sync_src() 函数,以配置结构体 mcpwm_gpio_sync_src_config_t 为参数,分配一个 GPIO 同步源。结构体定义为:

分配成功后,mcpwm_new_gpio_sync_src() 将返回一个指向已分配同步源的指针。否则,函数将返回错误代码。具体来说,当 MCPWM 组中没有空闲 GPIO 时钟源时,将返回 ESP_ERR_NOT_FOUND 错误。1

调用 mcpwm_new_timer_sync_src() 函数,以配置结构体 mcpwm_timer_sync_src_config_t 为参数,分配一个定时器事件同步源。结构体定义为:

分配成功后,mcpwm_new_timer_sync_src() 将返回一个指向已分配同步源的指针。否则,函数将返回错误代码。具体来说,若是分配的同步源此前已分配给了同一个定时器,将返回 ESP_ERR_INVALID_STATE 错误。

也可以调用 mcpwm_new_soft_sync_src() 函数,以配置结构体 mcpwm_soft_sync_config_t 为参数,分配一个软件同步源。该结构体暂时保留,供后续使用。

分配成功后,mcpwm_new_soft_sync_src() 将返回一个指向已分配同步源的指针。否则,函数将返回错误代码。具体来说,当内存不足以支持分配的同步源时,将返回 ESP_ERR_NO_MEM 错误。需注意,为确保软件同步源能够正常工作,应预先调用 mcpwm_soft_sync_activate()

相反,调用 mcpwm_del_sync_src() 函数将释放分配的同步源对象。此函数适用于所有类型的同步源。

MCPWM 捕获定时器和通道

MCPWM 组有一个专用定时器,用于捕获特定事件发生时的时间戳。捕获定时器连接了数个独立通道,每个通道都分配了各自的 GPIO。

调用 mcpwm_new_capture_timer() 函数,以配置结构体 mcpwm_capture_timer_config_t 为参数,分配一个捕获定时器。结构体定义为:

备注

在 ESP32 中,mcpwm_capture_timer_config_t::resolution_hz 参数无效,捕获定时器的分辨率始终等于 MCPWM_CAPTURE_CLK_SRC_APB

分配成功后,mcpwm_new_capture_timer() 将返回一个指向已分配捕获定时器的指针。否则,函数将返回错误代码。具体来说,当 MCPWM 组中没有空闲捕获定时器时,将返回 ESP_ERR_NOT_FOUND 错误。1

接下来,可以调用 mcpwm_new_capture_channel() 函数,以一个捕获定时器句柄和配置结构体 mcpwm_capture_channel_config_t 为参数,分配一个捕获通道。结构体定义为:

分配成功后,mcpwm_new_capture_channel() 将返回一个指向已分配捕获通道的指针。否则,函数将返回错误代码。具体来说,当捕获定时器中没有空闲捕获通道时,将返回 ESP_ERR_NOT_FOUND 错误。

反之,调用 mcpwm_del_capture_channel()mcpwm_del_capture_timer() 将释放已分配的捕获通道和定时器。

MCPWM 中断优先级

MCPWM 允许为 定时器、操作器、比较器、故障以及捕获事件分别配置中断,中断优先级由各自的 config_t::intr_priority 决定。且同一个 MCPWM 组中的事件共享同一个中断源。注册多个中断事件时,中断优先级需要保持一致。

备注

MCPWM 组注册多个中断事件时,驱动将以第一个事件的中断优先级作为 MCPWM 组的中断优先级。

定时器操作和事件

更新定时器周期

定时器周期在创建定时器时就已经通过 mcpwm_timer_config_t::period_ticks 被初始化过了。你还可以在运行期间,调用 mcpwm_timer_set_period() 函数来更新定时周期。新周期的生效时机由 mcpwm_timer_config_t::update_period_on_emptymcpwm_timer_config_t::update_period_on_sync 共同决定。如果他们两个参数都是 false, 那么新的定时周期会立即生效。

注册定时器事件回调

MCPWM 定时器运行时会生成不同的事件。若有函数需在特定事件发生时调用,则应预先调用 mcpwm_timer_register_event_callbacks(),将所需函数挂载至中断服务程序 (ISR) 中。驱动中定时器回调函数原型声明为 mcpwm_timer_event_cb_t,其所支持的事件回调类型则列在 mcpwm_timer_event_callbacks_t 中:

由于上述回调函数是在 ISR 中调用的,因此,这些函数 不应 涉及 block 操作。可以检查调用 API 的后缀,确保在函数中只调用了后缀为 ISR 的 FreeRTOS API。

函数 mcpwm_timer_register_event_callbacks() 中的 user_data 参数用于保存用户上下文,将直接传递至各个回调函数。

此函数会在不启用 MCPWM 定时器的情况下延迟安装其中断服务。因此,需在调用 mcpwm_timer_enable() 函数前调用该函数,否则将返回 ESP_ERR_INVALID_STATE 错误。更多信息请参见 启用和禁用定时器

启用和禁用定时器

在对定时器进行 IO 控制前,需要预先调用 mcpwm_timer_enable() 函数启用定时器。这个函数将:

  • 将定时器的状态从 init 切换到 enable

  • 若中断服务此前已通过 mcpwm_timer_register_event_callbacks() 函数延迟安装,则启用中断服务。

  • 若选择了特定时钟源(例如 PLL_160M 时钟),则获取相应的电源管理锁。更多信息请参见 电源管理

反之,调用 mcpwm_timer_disable() 会将定时器切换回 init 状态、禁用中断服务并释放电源管理锁。

启动和停止定时器

通过基本的 IO 控制,即可启动和停止定时器。使用不同的 mcpwm_timer_start_stop_cmd_t 命令调用 mcpwm_timer_start_stop() 便可立即启动定时器,或在发生特定事件时停止定时器。此外,还可以通过配置,让定时器仅计数一轮。也就是说,在计数达到峰值或零后,定时器自行停止。

连接定时器和操作器

调用 mcpwm_operator_connect_timer() 函数,连接分配的 MCPWM 定时器和 MCPWM 操作器。连接后,操作器即可将定时器作为时基,生成所需的 PWM 波形。需注意,MCPWM 定时器和操作器必须位于同一个组中。否则,将返回 ESP_ERR_INVALID_ARG 错误。

比较器操作和事件

注册比较器事件回调

MCPWM 比较器可以在定时器计数器等于比较值时发送通知。若有函数需在比较事件发生时调用,则应预先调用 mcpwm_comparator_register_event_callbacks(),将所需函数挂载至中断服务程序 (ISR) 中。驱动中比较器回调函数原型声明为 mcpwm_compare_event_cb_t,其所支持的事件回调类型则列在 mcpwm_comparator_event_callbacks_t 中:

回调函数会提供类型为 mcpwm_compare_event_data_t 的事件特定数据。由于上述回调函数是在 ISR 中调用的,因此,这些函数 不应 涉及 block 操作。可以检查调用 API 的后缀,确保在函数中只调用了后缀为 ISR 的 FreeRTOS API。

函数 mcpwm_comparator_register_event_callbacks() 中的 user_data 参数用于保存用户上下文,将直接传递至各个回调函数。

此函数会延迟安装 MCPWM 比较器的中断服务。中断服务只能通过 mcpwm_del_comparator 移除。

设置比较值

运行 MCPWM 比较器时,可以调用 mcpwm_comparator_set_compare_value() 设置比较值。需注意以下几点:

生成器对事件执行的操作

设置生成器对定时器事件执行的操作

调用 mcpwm_generator_set_actions_on_timer_event() 并辅以若干操作配置,可以针对不同的定时器事件,为生成器设置不同的操作。操作配置定义在 mcpwm_gen_timer_event_action_t 中:

可借助辅助宏 MCPWM_GEN_TIMER_EVENT_ACTION 构建定时器事件操作条目。

需注意,mcpwm_generator_set_actions_on_timer_event() 的参数列表 必须MCPWM_GEN_TIMER_EVENT_ACTION_END 结束。

也可以调用 mcpwm_generator_set_action_on_timer_event() 逐一设置定时器操作,无需涉及变量参数。

设置生成器对比较器事件执行的操作

调用 mcpwm_generator_set_actions_on_compare_event() 并辅以若干操作配置,可以针对不同的比较器事件,为生成器设置不同的操作。操作配置定义在 mcpwm_gen_compare_event_action_t 中:

可借助辅助宏 MCPWM_GEN_COMPARE_EVENT_ACTION 构建比较事件操作条目。

需注意,mcpwm_generator_set_actions_on_compare_event() 的参数列表 必须MCPWM_GEN_COMPARE_EVENT_ACTION_END 结束。

也可以调用 mcpwm_generator_set_action_on_compare_event() 逐一设置比较器操作,无需涉及变量参数。

设置生成器对故障事件执行的操作

调用 mcpwm_generator_set_action_on_fault_event() 并辅以操作配置,可以针对故障事件,为生成器设置操作。操作配置定义在 mcpwm_gen_fault_event_action_t 中:

当生成器所属的操作器中没有空闲触发器时,将返回 ESP_ERR_NOT_FOUND 错误。1

触发器支持的故障仅为 GPIO 故障,当传入故障不为 GPIO 故障时,将返回 ESP_ERR_NOT_SUPPORTED 错误。

可借助辅助宏 MCPWM_GEN_FAULT_EVENT_ACTION 构建触发事件操作条目。

需注意,故障事件没有类似 mcpwm_generator_set_actions_on_fault_event() 这样的可变参数函数。

设置生成器对同步事件执行的操作

调用 mcpwm_generator_set_action_on_sync_event() 并辅以操作配置,可以针对同步事件,为生成器设置操作。操作配置定义在 mcpwm_gen_sync_event_action_t 中:

当生成器所属的操作器中没有空闲触发器时,将返回 ESP_ERR_NOT_FOUND 错误。1

无论同步为何种类型,触发器仅支持一种同步操作,如果多次设置同步操作,将返回 ESP_ERR_INVALID_STATE 错误。

可借助辅助宏 MCPWM_GEN_SYNC_EVENT_ACTION 构建触发事件操作条目。

需注意,同步事件没有类似 mcpwm_generator_set_actions_on_sync_event() 这样的可变参数函数。

经典 PWM 波形的生成器配置

本节提供了一些生成器支持生成的经典 PWM 波形,同时提供用于生成这些波形的代码片段。总的来说:

  • 生成波形为 对称波形 还是 不对称波形 取决于 MCPWM 定时器的计数模式。

  • 波形对的 激活电平 取决于占空比较小的 PWM 波形的电平。

  • PWM 波形的周期取决于定时器的周期和计数模式。

  • PWM 波形的占空比取决于生成器的各种操作配置组合。

单边不对称波形 - 高电平

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(gena,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_LOW)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(genb,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(genb,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpb, MCPWM_GEN_ACTION_LOW)));
}

单边不对称波形 - 低电平

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(gena,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_FULL, MCPWM_GEN_ACTION_LOW)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(genb,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_FULL, MCPWM_GEN_ACTION_LOW)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(genb,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpb, MCPWM_GEN_ACTION_HIGH)));
}

脉冲位置不对称波形

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_actions_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_HIGH),
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpb, MCPWM_GEN_ACTION_LOW),
                    MCPWM_GEN_COMPARE_EVENT_ACTION_END()));
    ESP_ERROR_CHECK(mcpwm_generator_set_actions_on_timer_event(genb,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_TOGGLE),
                    MCPWM_GEN_TIMER_EVENT_ACTION_END()));
}

双沿不对称波形 - 低电平有效

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_actions_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_HIGH),
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_DOWN, cmpb, MCPWM_GEN_ACTION_LOW),
                    MCPWM_GEN_COMPARE_EVENT_ACTION_END()));
    ESP_ERROR_CHECK(mcpwm_generator_set_actions_on_timer_event(genb,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_LOW),
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_DOWN, MCPWM_TIMER_EVENT_FULL, MCPWM_GEN_ACTION_HIGH),
                    MCPWM_GEN_TIMER_EVENT_ACTION_END()));
}

双沿对称波形 - 低电平有效

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_actions_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_HIGH),
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_DOWN, cmpa, MCPWM_GEN_ACTION_LOW),
                    MCPWM_GEN_COMPARE_EVENT_ACTION_END()));
    ESP_ERROR_CHECK(mcpwm_generator_set_actions_on_compare_event(genb,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpb, MCPWM_GEN_ACTION_HIGH),
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_DOWN, cmpb, MCPWM_GEN_ACTION_LOW),
                    MCPWM_GEN_COMPARE_EVENT_ACTION_END()));
}

双沿对称波形 - 互补

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_actions_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_HIGH),
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_DOWN, cmpa, MCPWM_GEN_ACTION_LOW),
                    MCPWM_GEN_COMPARE_EVENT_ACTION_END()));
    ESP_ERROR_CHECK(mcpwm_generator_set_actions_on_compare_event(genb,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpb, MCPWM_GEN_ACTION_LOW),
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_DOWN, cmpb, MCPWM_GEN_ACTION_HIGH),
                    MCPWM_GEN_COMPARE_EVENT_ACTION_END()));
}

死区

在电力电子学中,常常会用到整流器和逆变器,这就涉及到了整流桥和逆变桥的应用。每个桥臂配有两个功率电子器件,例如 MOSFET、IGBT 等。同一桥臂上的两个 MOSFET 不能同时导通,否则会造成短路。实际应用中,在 PWM 波形显示 MOSFET 开关已关闭后,仍需要一段时间窗口才能完全关闭 MOSFET。因此,需要设置 生成器对事件执行的操作,在已生成的 PWM 波形上添加额外延迟。

死区驱动器的工作方式与 装饰器 类似。在 mcpwm_generator_set_dead_time() 函数的参数中,驱动接收主要生成器句柄 (in_generator),并在应用死区后返回一个新的生成器 (out_generator)。需注意,如果 out_generatorin_generator 相同,这表示 PWM 波形中的时间延迟是以“就地”的方式添加的。反之,如果 out_generatorin_generator 不同,则代表在原 in_generator 的基础上派生出了一个新的 PWM 波形。

结构体 mcpwm_dead_time_config_t 中列出了死区相关的具体配置:

警告

由于硬件限制,同一种 delay 模块(posedge delay 或者 negedge delay)不能同时被应用在不同的 MCPWM 生成器中。例如,以下配置是无效的:

mcpwm_dead_time_config_t dt_config = {
    .posedge_delay_ticks = 10,
};
// 给 generator A 叠加上升沿 delay
mcpwm_generator_set_dead_time(mcpwm_gen_a, mcpwm_gen_a, &dt_config);
// NOTE: 下面的操作是无效的,不能将同一种 delay 应用于不同的 generator 上
mcpwm_generator_set_dead_time(mcpwm_gen_b, mcpwm_gen_b, &dt_config);

然而,你可以为生成器 A 设置 posedge delay,为生成器 B 设置 negedge delay。另外,也可以为生成器 A 同时设置 posedge delaynegedge delay,而让生成器 B 绕过死区模块。

备注

也可以通过设置 生成器对事件执行的操作 来生成所需的死区,通过不同的比较器来控制边沿位置。但是,如果需要使用经典的基于边沿延迟并附带极性控制的死区,则应使用死区子模块。

经典 PWM 波形的死区配置

本节提供了一些死区子模块支持生成的经典 PWM 波形,同时在图片下方提供用于生成这些波形的代码片段。

高电平有效互补

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(gena,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_LOW)));
}

static void dead_time_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb)
{
    mcpwm_dead_time_config_t dead_time_config = {
        .posedge_delay_ticks = 50,
        .negedge_delay_ticks = 0
    };
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(gena, gena, &dead_time_config));
    dead_time_config.posedge_delay_ticks = 0;
    dead_time_config.negedge_delay_ticks = 100;
    dead_time_config.flags.invert_output = true;
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(gena, genb, &dead_time_config));
}

低电平有效互补

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(gena,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_LOW)));
}

static void dead_time_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb)
{
    mcpwm_dead_time_config_t dead_time_config = {
        .posedge_delay_ticks = 50,
        .negedge_delay_ticks = 0,
        .flags.invert_output = true
    };
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(gena, gena, &dead_time_config));
    dead_time_config.posedge_delay_ticks = 0;
    dead_time_config.negedge_delay_ticks = 100;
    dead_time_config.flags.invert_output = false;
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(gena, genb, &dead_time_config));
}

高电平有效

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(gena,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_LOW)));
}

static void dead_time_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb)
{
    mcpwm_dead_time_config_t dead_time_config = {
        .posedge_delay_ticks = 50,
        .negedge_delay_ticks = 0,
    };
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(gena, gena, &dead_time_config));
    dead_time_config.posedge_delay_ticks = 0;
    dead_time_config.negedge_delay_ticks = 100;
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(gena, genb, &dead_time_config));
}

低电平有效

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(gena,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_LOW)));
}

static void dead_time_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb)
{
    mcpwm_dead_time_config_t dead_time_config = {
        .posedge_delay_ticks = 50,
        .negedge_delay_ticks = 0,
        .flags.invert_output = true
    };
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(gena, gena, &dead_time_config));
    dead_time_config.posedge_delay_ticks = 0;
    dead_time_config.negedge_delay_ticks = 100;
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(gena, genb, &dead_time_config));
}

PWMA 上升沿延迟,绕过 PWMB 死区

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(gena,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_LOW)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(genb,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(genb,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpb, MCPWM_GEN_ACTION_LOW)));
}

static void dead_time_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb)
{
    mcpwm_dead_time_config_t dead_time_config = {
        .posedge_delay_ticks = 50,
        .negedge_delay_ticks = 0,
    };
    // apply deadtime to generator_a
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(gena, gena, &dead_time_config));
    // bypass deadtime module for generator_b
    dead_time_config.posedge_delay_ticks = 0;
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(genb, genb, &dead_time_config));
}

PWMB 下降沿延迟,绕过 PWMA 死区

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(gena,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_LOW)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(genb,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(genb,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpb, MCPWM_GEN_ACTION_LOW)));
}

static void dead_time_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb)
{
    mcpwm_dead_time_config_t dead_time_config = {
        .posedge_delay_ticks = 0,
        .negedge_delay_ticks = 0,
    };
    // generator_a bypass the deadtime module (no delay)
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(gena, gena, &dead_time_config));
    // apply dead time to generator_b
    dead_time_config.negedge_delay_ticks = 50;
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(genb, genb, &dead_time_config));

}

PWMB 上升下降沿延迟,绕过 PWMA 死区

static void gen_action_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb, mcpwm_cmpr_handle_t cmpa, mcpwm_cmpr_handle_t cmpb)
{
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(gena,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(gena,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpa, MCPWM_GEN_ACTION_LOW)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_timer_event(genb,
                    MCPWM_GEN_TIMER_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, MCPWM_TIMER_EVENT_EMPTY, MCPWM_GEN_ACTION_HIGH)));
    ESP_ERROR_CHECK(mcpwm_generator_set_action_on_compare_event(genb,
                    MCPWM_GEN_COMPARE_EVENT_ACTION(MCPWM_TIMER_DIRECTION_UP, cmpb, MCPWM_GEN_ACTION_LOW)));
}

static void dead_time_config(mcpwm_gen_handle_t gena, mcpwm_gen_handle_t genb)
{
    mcpwm_dead_time_config_t dead_time_config = {
        .posedge_delay_ticks = 0,
        .negedge_delay_ticks = 0,
    };
    // generator_a bypass the deadtime module (no delay)
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(gena, gena, &dead_time_config));
    // apply dead time on both edge for generator_b
    dead_time_config.negedge_delay_ticks = 50;
    dead_time_config.posedge_delay_ticks = 50;
    ESP_ERROR_CHECK(mcpwm_generator_set_dead_time(genb, genb, &dead_time_config));
}

载波调制

MCPWM 操作器具有载波子模块,可以根据需要(例如隔离式数字电源应用中)使用变压器传递 PWM 输出信号,实现电机驱动器的电气隔离。在电机需要在全负荷下稳定运行时,各个 PWM 输出信号都将占空比稳定保持在 100% 左右。由于变压器无法直接耦合非交替信号,需要使用载波子模块调制信号,生成交流电波形,从而实现耦合。

调用 mcpwm_operator_apply_carrier(),并提供配置结构体 mcpwm_carrier_config_t,配置载波子模块:

具体而言,可调用 mcpwm_operator_apply_carrier() 并将其配置为 NULL,禁用载波子模块。

故障检测和制动控制

MCPWM 操作器能够感知外部信号,接收有关电机故障、功率驱动器及其他连接设备的信息。这些故障信号封装在 MCPWM 故障对象中。

电机需配置故障模式以及检测到特定故障时的对应操作,例如拉低有刷电机的所有输出,或是锁定步进电机的电流状态等。此操作应使电机重回安全状态,降低故障导致损坏的可能性。

设置故障时操作器的制动模式

MCPWM 操作器对故障的响应方式为 制动。可以调用 mcpwm_operator_set_brake_on_fault(),为每个故障对象配置不同的制动模式。制动的相关配置包含在结构体 mcpwm_brake_config_t 中:

设置发生制动事件时的生成器操作

调用 mcpwm_generator_set_actions_on_brake_event() 并辅以若干操作配置,可以针对不同的制动事件,为生成器设置不同的对应操作。操作配置定义在 mcpwm_gen_brake_event_action_t 中:

可借助辅助宏 MCPWM_GEN_BRAKE_EVENT_ACTION 构建制动事件操作条目。

需注意, mcpwm_generator_set_actions_on_brake_event() 的参数列表 必须MCPWM_GEN_BRAKE_EVENT_ACTION_END 结束。

也可以调用 mcpwm_generator_set_action_on_brake_event() 逐一设置制动操作,无需涉及变量参数。

注册故障事件回调

MCPWM 故障检测器支持在检测到实际故障或故障信号消失时发送通知。若有函数需在特定事件发生时调用,则应预先调用 mcpwm_fault_register_event_callbacks(),将所需函数挂载至中断服务程序 (ISR) 中。驱动中故障事件回调函数原型声明为 mcpwm_fault_event_cb_t,其所支持的事件回调类型则列在 mcpwm_fault_event_callbacks_t 中:

由于上述回调函数在 ISR 中调用,因此,这些函数 不应 涉及 block 操作。可以检查调用 API 的后缀,确保在函数中只调用了后缀为 ISR 的 FreeRTOS API。

函数 mcpwm_fault_register_event_callbacks() 中的 user_data 参数用于保存用户上下文,将直接传递至各个回调函数。

此函数会延迟安装 MCPWM 故障的中断服务。中断服务只能通过 mcpwm_del_fault 移除。

寄存器制动事件回调

MCPWM 操作器支持在进行制动操作前发送通知。若有函数需在特定事件发生时调用,则应预先调用 mcpwm_operator_register_event_callbacks(),将所需函数挂载至中断服务程序 (ISR) 中。驱动中制动事件回调函数原型声明为 mcpwm_brake_event_cb_t,其所支持的事件回调类型则列在 mcpwm_operator_event_callbacks_t 中:

由于上述回调函数在 ISR 中调用,因此,这些函数 不应 涉及 block 操作。可以检查调用 API 的后缀,确保在函数中只调用了后缀为 ISR 的 FreeRTOS API。

函数 mcpwm_operator_register_event_callbacks() 中的 user_data 参数用于保存用户上下文,将直接传递至各个回调函数。

此函数会延迟安装 MCPWM 故障的中断服务。中断服务只能通过 mcpwm_del_operator 移除。

生成器强制操作

调用 mcpwm_generator_set_force_level(),使能软件强制决定运行时的生成器输出电平。相较于通过 mcpwm_generator_set_actions_on_timer_event() 配置的其他事件操作,软件强制事件优先级最高。

  • 设置 level 为 -1,代表禁用强制操作,生成器的输出电平重新交由事件操作控制。

  • 设置 hold_on 为 true,代表强制输出电平将保持不变,直到设置 level 为 -1 来移除该电平。

  • 设置 hole_on 为 false,代表强制输出电平仅在短时间有效,随后发生的任何事件都可以改变该电平。

同步模块

MCPWM 定时器接收到同步信号后,定时器将强制进入一个预定义的 相位,该相位由计数值和计数方向共同决定。调用 mcpwm_timer_set_phase_on_sync(),设置同步相位。同步相位配置定义在 mcpwm_timer_sync_phase_config_t 结构体中:

备注

当 MCPWM 定时器在 MCPWM_TIMER_COUNT_MODE_UP_DOWN 模式下工作时,需要特别注意。在该模式下,计数器范围 [0 -> peak-1] 属于 递增 阶段, [peak -> 1] 属于 递减 阶段。因此,如果你将 mcpwm_timer_sync_phase_config_t::count_value 设置为零,则可能还需要将 mcpwm_timer_sync_phase_config_t::direction 设置为 MCPWM_TIMER_DIRECTION_UP。否则,计时器将继续维持递减阶段,计数值会下溢至峰值。

同理, MCPWM 捕获定时器和通道 也支持同步。调用 mcpwm_capture_timer_set_phase_on_sync(),设置捕获定时器的同步相位。同步相位配置定义在 mcpwm_capture_timer_sync_phase_config_t 结构体中:

使用 GPIO 同步定时器

GPIO Sync All MCPWM Timers

static void example_setup_sync_strategy(mcpwm_timer_handle_t timers[])
{
    mcpwm_sync_handle_t gpio_sync_source = NULL;
    mcpwm_gpio_sync_src_config_t gpio_sync_config = {
        .group_id = 0,              // GPIO 故障应与以上定时器位于同一组中
        .gpio_num = EXAMPLE_SYNC_GPIO,
        .flags.pull_down = true,
        .flags.active_neg = false,  // 默认情况下,一个上升沿脉冲可以触发一个同步事件
    };
    ESP_ERROR_CHECK(mcpwm_new_gpio_sync_src(&gpio_sync_config, &gpio_sync_source));

    mcpwm_timer_sync_phase_config_t sync_phase_config = {
        .count_value = 0,                      // 同步相位:目标计数值
        .direction = MCPWM_TIMER_DIRECTION_UP, // 同步相位:计数方向
        .sync_src = gpio_sync_source,          // 同步源
    };
    for (int i = 0; i < 3; i++) {
        ESP_ERROR_CHECK(mcpwm_timer_set_phase_on_sync(timers[i], &sync_phase_config));
    }
}

捕获模块

MCPWM 捕获的主要功能是记录捕获信号的脉冲边沿的有效时间。可以通过捕获得到脉宽,随后使用捕获回调函数将脉宽转换为其他物理量,如距离或速度。例如,在下图的无刷直流电机 (BLDC) 方案中,可以使用捕获子模块来确认来自霍尔传感器的转子位置。

带霍尔传感器的 MCPWM 无刷直流电机

带霍尔传感器的 MCPWM 无刷直流电机

通常,捕获定时器连接了数个捕获通道。有关资源分配的相关信息,请参见 MCPWM 捕获定时器和通道

注册捕获事件回调

MCPWM 捕获通道支持在信号上检测到有效边沿时发送通知。须调用 mcpwm_capture_channel_register_event_callbacks(),注册一个回调函数来获得捕获的定时器计数值。回调函数原型声明在 mcpwm_capture_event_cb_t 中,可以调用 mcpwm_capture_event_callbacks_t 查看支持的捕获回调:

回调函数会针对特定事件,提供 mcpwm_capture_event_data_t 类型的数据,由此,可以通过 mcpwm_capture_event_data_t::cap_edgemcpwm_capture_event_data_t::cap_value 分别得到捕获信号的边沿及该捕获的计数值。随后,调用 mcpwm_capture_timer_get_resolution(),获取捕获定时器的分辨率,以将捕获计数转换为时间戳。

由于上述回调函数在 ISR 中调用,因此,这些函数 不应 涉及 block 操作。可以检查调用 API 的后缀,确保在函数中只调用了后缀为 ISR 的 FreeRTOS API。

函数 mcpwm_capture_channel_register_event_callbacks() 中的 user_data 参数用于保存用户上下文,将直接传递至各个回调函数。

此函数会延迟安装 MCPWM 捕获的中断服务。中断服务只能通过 mcpwm_del_capture_channel 移除。

启用或禁用捕获通道

调用 mcpwm_new_capture_channel() 进行分配后,捕获通道不会自动启用。应调用 mcpwm_capture_channel_enable()mcpwm_capture_channel_disable() 来启用或禁用该通道。如果在为通道注册事件回调时,由于调用了 mcpwm_capture_channel_register_event_callbacks(),致使延迟安装中断服务,则调用 mcpwm_capture_channel_enable() 启用通道时,也将启用中断服务。

启用或禁用捕获定时器

在对捕获定时器进行 IO 控制之前,需要首先调用 mcpwm_capture_timer_enable(),启用定时器。此函数将进行如下内部操作:

  • 将捕获定时器的状态从 init 切换到 enable

  • 如果选择了一个特定时钟源(例如 APB 时钟),则获取一个对应的电源管理锁。更多信息请参见 电源管理

反之,调用 mcpwm_capture_timer_disable() 将使定时器驱动程序切换回 init 状态,并释放电源管理锁。

启动或停止捕获定时器

通过基本的 IO 控制,即可启动或停止捕获定时器。调用 mcpwm_capture_timer_start() 启动捕获定时器,或调用 mcpwm_capture_timer_stop() 立即停止捕获定时器。

触发软件捕获事件

某些场景下,可能存在需要软件触发“虚假”捕获事件的需求。此时,可以调用 mcpwm_capture_channel_trigger_soft_catch() 实现。需注意,此类“虚假”捕获事件仍然会触发中断,并从而调用捕获事件回调函数。

电源管理

启用电源管理(即开启 CONFIG_PM_ENABLE)时,系统会在进入 Light-sleep 前调整 PLL 和 APB 频率。该操作有可能会改变 MCPWM 定时器的计数步长,导致计时偏差。

不过,驱动程序可以获取 ESP_PM_APB_FREQ_MAX 类型的电源管理锁,防止系统改变 APB 频率。每当驱动创建以 MCPWM_TIMER_CLK_SRC_PLL160M 作为时钟源的 MCPWM 定时器实例时,都会在通过 mcpwm_timer_enable() 启用定时器时获取电源管理锁。反之,调用 mcpwm_timer_disable() 时,驱动程序释放锁。

同理,每当驱动创建一个以 MCPWM_CAPTURE_CLK_SRC_APB 作为时钟源的 MCPWM 捕获定时器实例时,都会在通过 mcpwm_capture_timer_enable() 启用定时器时获取电源管理锁,并在调用 mcpwm_capture_timer_disable() 时释放锁。

IRAM 安全

默认情况下,禁用 cache 时,写入/擦除 flash 等原因将导致 MCPWM 中断延迟,事件回调函数也将延迟执行。在实时应用程序中,应避免此类情况。

因此,可以启用 Kconfig 选项 CONFIG_MCPWM_ISR_IRAM_SAFE,该选项:

  • 支持在禁用 cache 时启用所需中断

  • 支持将 ISR 使用的所有函数存放在 IRAM 中 2

  • 支持将驱动程序存放在 DRAM 中(以防其意外映射到 PSRAM 中)

启用该选项可以保证 cache 禁用时的中断运行,但会相应增加 IRAM 占用。

另一个 Kconfig 选项 CONFIG_MCPWM_CTRL_FUNC_IN_IRAM 也支持将常用的 IO 控制函数存放在 IRAM 中,以保证在禁用 cache 时可以正常使用函数。IO 控制函数如下所示:

线程安全

驱动程序会确保工厂函数(如 mcpwm_new_timer())的线程安全,使用时,可以直接从不同的 RTOS 任务中调用此类函数,无需额外锁保护。

驱动程序设置了临界区,以防函数同时在任务和 ISR 中调用。因此,以下函数支持在 ISR 上下文运行:

资源配置及初始化 中尚未提及的函数并非线程安全。在没有设置互斥锁保护的任务中,应避免调用这些函数。

Kconfig 选项

应用示例

API Reference

Header File

  • components/esp_driver_mcpwm/include/driver/mcpwm_timer.h

  • This header file can be included with:

    #include "driver/mcpwm_timer.h"
    
  • This header file is a part of the API provided by the esp_driver_mcpwm component. To declare that your component depends on esp_driver_mcpwm, add the following to your CMakeLists.txt:

    REQUIRES esp_driver_mcpwm
    

    or

    PRIV_REQUIRES esp_driver_mcpwm
    

Functions

esp_err_t mcpwm_new_timer(const mcpwm_timer_config_t *config, mcpwm_timer_handle_t *ret_timer)

Create MCPWM timer.

参数
  • config -- [in] MCPWM timer configuration

  • ret_timer -- [out] Returned MCPWM timer handle

返回

  • ESP_OK: Create MCPWM timer successfully

  • ESP_ERR_INVALID_ARG: Create MCPWM timer failed because of invalid argument

  • ESP_ERR_NO_MEM: Create MCPWM timer failed because out of memory

  • ESP_ERR_NOT_FOUND: Create MCPWM timer failed because all hardware timers are used up and no more free one

  • ESP_FAIL: Create MCPWM timer failed because of other error

esp_err_t mcpwm_del_timer(mcpwm_timer_handle_t timer)

Delete MCPWM timer.

参数

timer -- [in] MCPWM timer handle, allocated by mcpwm_new_timer()

返回

  • ESP_OK: Delete MCPWM timer successfully

  • ESP_ERR_INVALID_ARG: Delete MCPWM timer failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Delete MCPWM timer failed because timer is not in init state

  • ESP_FAIL: Delete MCPWM timer failed because of other error

esp_err_t mcpwm_timer_set_period(mcpwm_timer_handle_t timer, uint32_t period_ticks)

Set a new period for MCPWM timer.

备注

If mcpwm_timer_config_t::update_period_on_empty and mcpwm_timer_config_t::update_period_on_sync are not set, the new period will take effect immediately. Otherwise, the new period will take effect when timer counts to zero or on sync event.

备注

You may need to use mcpwm_comparator_set_compare_value to set a new compare value for MCPWM comparator in order to keep the same PWM duty cycle.

参数
  • timer -- [in] MCPWM timer handle, allocated by mcpwm_new_timer

  • period_ticks -- [in] New period in count ticks

返回

  • ESP_OK: Set new period for MCPWM timer successfully

  • ESP_ERR_INVALID_ARG: Set new period for MCPWM timer failed because of invalid argument

  • ESP_FAIL: Set new period for MCPWM timer failed because of other error

esp_err_t mcpwm_timer_enable(mcpwm_timer_handle_t timer)

Enable MCPWM timer.

参数

timer -- [in] MCPWM timer handle, allocated by mcpwm_new_timer()

返回

  • ESP_OK: Enable MCPWM timer successfully

  • ESP_ERR_INVALID_ARG: Enable MCPWM timer failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Enable MCPWM timer failed because timer is enabled already

  • ESP_FAIL: Enable MCPWM timer failed because of other error

esp_err_t mcpwm_timer_disable(mcpwm_timer_handle_t timer)

Disable MCPWM timer.

参数

timer -- [in] MCPWM timer handle, allocated by mcpwm_new_timer()

返回

  • ESP_OK: Disable MCPWM timer successfully

  • ESP_ERR_INVALID_ARG: Disable MCPWM timer failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Disable MCPWM timer failed because timer is disabled already

  • ESP_FAIL: Disable MCPWM timer failed because of other error

esp_err_t mcpwm_timer_start_stop(mcpwm_timer_handle_t timer, mcpwm_timer_start_stop_cmd_t command)

Send specific start/stop commands to MCPWM timer.

参数
  • timer -- [in] MCPWM timer handle, allocated by mcpwm_new_timer()

  • command -- [in] Supported command list for MCPWM timer

返回

  • ESP_OK: Start or stop MCPWM timer successfully

  • ESP_ERR_INVALID_ARG: Start or stop MCPWM timer failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Start or stop MCPWM timer failed because timer is not enabled

  • ESP_FAIL: Start or stop MCPWM timer failed because of other error

esp_err_t mcpwm_timer_register_event_callbacks(mcpwm_timer_handle_t timer, const mcpwm_timer_event_callbacks_t *cbs, void *user_data)

Set event callbacks for MCPWM timer.

备注

The first call to this function needs to be before the call to mcpwm_timer_enable

备注

User can deregister a previously registered callback by calling this function and setting the callback member in the cbs structure to NULL.

参数
  • timer -- [in] MCPWM timer handle, allocated by mcpwm_new_timer()

  • cbs -- [in] Group of callback functions

  • user_data -- [in] User data, which will be passed to callback functions directly

返回

  • ESP_OK: Set event callbacks successfully

  • ESP_ERR_INVALID_ARG: Set event callbacks failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Set event callbacks failed because timer is not in init state

  • ESP_FAIL: Set event callbacks failed because of other error

esp_err_t mcpwm_timer_set_phase_on_sync(mcpwm_timer_handle_t timer, const mcpwm_timer_sync_phase_config_t *config)

Set sync phase for MCPWM timer.

参数
  • timer -- [in] MCPWM timer handle, allocated by mcpwm_new_timer()

  • config -- [in] MCPWM timer sync phase configuration

返回

  • ESP_OK: Set sync phase for MCPWM timer successfully

  • ESP_ERR_INVALID_ARG: Set sync phase for MCPWM timer failed because of invalid argument

  • ESP_FAIL: Set sync phase for MCPWM timer failed because of other error

Structures

struct mcpwm_timer_event_callbacks_t

Group of supported MCPWM timer event callbacks.

备注

The callbacks are all running under ISR environment

Public Members

mcpwm_timer_event_cb_t on_full

callback function when MCPWM timer counts to peak value

mcpwm_timer_event_cb_t on_empty

callback function when MCPWM timer counts to zero

mcpwm_timer_event_cb_t on_stop

callback function when MCPWM timer stops

struct mcpwm_timer_config_t

MCPWM timer configuration.

Public Members

int group_id

Specify from which group to allocate the MCPWM timer

mcpwm_timer_clock_source_t clk_src

MCPWM timer clock source

uint32_t resolution_hz

Counter resolution in Hz The step size of each count tick equals to (1 / resolution_hz) seconds

mcpwm_timer_count_mode_t count_mode

Count mode

uint32_t period_ticks

Number of count ticks within a period

int intr_priority

MCPWM timer interrupt priority, if set to 0, the driver will try to allocate an interrupt with a relative low priority (1,2,3)

uint32_t update_period_on_empty

Whether to update period when timer counts to zero

uint32_t update_period_on_sync

Whether to update period on sync event

struct mcpwm_timer_config_t::[anonymous] flags

Extra configuration flags for timer

struct mcpwm_timer_sync_phase_config_t

MCPWM Timer sync phase configuration.

Public Members

mcpwm_sync_handle_t sync_src

The sync event source. Set to NULL will disable the timer being synced by others

uint32_t count_value

The count value that should lock to upon sync event

mcpwm_timer_direction_t direction

The count direction that should lock to upon sync event

Header File

  • components/esp_driver_mcpwm/include/driver/mcpwm_oper.h

  • This header file can be included with:

    #include "driver/mcpwm_oper.h"
    
  • This header file is a part of the API provided by the esp_driver_mcpwm component. To declare that your component depends on esp_driver_mcpwm, add the following to your CMakeLists.txt:

    REQUIRES esp_driver_mcpwm
    

    or

    PRIV_REQUIRES esp_driver_mcpwm
    

Functions

esp_err_t mcpwm_new_operator(const mcpwm_operator_config_t *config, mcpwm_oper_handle_t *ret_oper)

Create MCPWM operator.

参数
  • config -- [in] MCPWM operator configuration

  • ret_oper -- [out] Returned MCPWM operator handle

返回

  • ESP_OK: Create MCPWM operator successfully

  • ESP_ERR_INVALID_ARG: Create MCPWM operator failed because of invalid argument

  • ESP_ERR_NO_MEM: Create MCPWM operator failed because out of memory

  • ESP_ERR_NOT_FOUND: Create MCPWM operator failed because can't find free resource

  • ESP_FAIL: Create MCPWM operator failed because of other error

esp_err_t mcpwm_del_operator(mcpwm_oper_handle_t oper)

Delete MCPWM operator.

参数

oper -- [in] MCPWM operator, allocated by mcpwm_new_operator()

返回

  • ESP_OK: Delete MCPWM operator successfully

  • ESP_ERR_INVALID_ARG: Delete MCPWM operator failed because of invalid argument

  • ESP_FAIL: Delete MCPWM operator failed because of other error

esp_err_t mcpwm_operator_connect_timer(mcpwm_oper_handle_t oper, mcpwm_timer_handle_t timer)

Connect MCPWM operator and timer, so that the operator can be driven by the timer.

参数
  • oper -- [in] MCPWM operator handle, allocated by mcpwm_new_operator()

  • timer -- [in] MCPWM timer handle, allocated by mcpwm_new_timer()

返回

  • ESP_OK: Connect MCPWM operator and timer successfully

  • ESP_ERR_INVALID_ARG: Connect MCPWM operator and timer failed because of invalid argument

  • ESP_FAIL: Connect MCPWM operator and timer failed because of other error

esp_err_t mcpwm_operator_set_brake_on_fault(mcpwm_oper_handle_t oper, const mcpwm_brake_config_t *config)

Set brake method for MCPWM operator.

参数
  • oper -- [in] MCPWM operator, allocated by mcpwm_new_operator()

  • config -- [in] MCPWM brake configuration

返回

  • ESP_OK: Set trip for operator successfully

  • ESP_ERR_INVALID_ARG: Set trip for operator failed because of invalid argument

  • ESP_FAIL: Set trip for operator failed because of other error

esp_err_t mcpwm_operator_recover_from_fault(mcpwm_oper_handle_t oper, mcpwm_fault_handle_t fault)

Try to make the operator recover from fault.

备注

To recover from fault or escape from trip, you make sure the fault signal has dissappeared already. Otherwise the recovery can't succeed.

参数
  • oper -- [in] MCPWM operator, allocated by mcpwm_new_operator()

  • fault -- [in] MCPWM fault handle

返回

  • ESP_OK: Recover from fault successfully

  • ESP_ERR_INVALID_ARG: Recover from fault failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Recover from fault failed because the fault source is still active

  • ESP_FAIL: Recover from fault failed because of other error

esp_err_t mcpwm_operator_register_event_callbacks(mcpwm_oper_handle_t oper, const mcpwm_operator_event_callbacks_t *cbs, void *user_data)

Set event callbacks for MCPWM operator.

备注

User can deregister a previously registered callback by calling this function and setting the callback member in the cbs structure to NULL.

参数
  • oper -- [in] MCPWM operator handle, allocated by mcpwm_new_operator()

  • cbs -- [in] Group of callback functions

  • user_data -- [in] User data, which will be passed to callback functions directly

返回

  • ESP_OK: Set event callbacks successfully

  • ESP_ERR_INVALID_ARG: Set event callbacks failed because of invalid argument

  • ESP_FAIL: Set event callbacks failed because of other error

esp_err_t mcpwm_operator_apply_carrier(mcpwm_oper_handle_t oper, const mcpwm_carrier_config_t *config)

Apply carrier feature for MCPWM operator.

参数
  • oper -- [in] MCPWM operator, allocated by mcpwm_new_operator()

  • config -- [in] MCPWM carrier specific configuration

返回

  • ESP_OK: Set carrier for operator successfully

  • ESP_ERR_INVALID_ARG: Set carrier for operator failed because of invalid argument

  • ESP_FAIL: Set carrier for operator failed because of other error

Structures

struct mcpwm_operator_config_t

MCPWM operator configuration.

Public Members

int group_id

Specify from which group to allocate the MCPWM operator

int intr_priority

MCPWM operator interrupt priority, if set to 0, the driver will try to allocate an interrupt with a relative low priority (1,2,3)

uint32_t update_gen_action_on_tez

Whether to update generator action when timer counts to zero

uint32_t update_gen_action_on_tep

Whether to update generator action when timer counts to peak

uint32_t update_gen_action_on_sync

Whether to update generator action on sync event

uint32_t update_dead_time_on_tez

Whether to update dead time when timer counts to zero

uint32_t update_dead_time_on_tep

Whether to update dead time when timer counts to peak

uint32_t update_dead_time_on_sync

Whether to update dead time on sync event

struct mcpwm_operator_config_t::[anonymous] flags

Extra configuration flags for operator

struct mcpwm_brake_config_t

MCPWM brake configuration structure.

Public Members

mcpwm_fault_handle_t fault

Which fault causes the operator to brake

mcpwm_operator_brake_mode_t brake_mode

Brake mode

uint32_t cbc_recover_on_tez

Recovery CBC brake state on tez event

uint32_t cbc_recover_on_tep

Recovery CBC brake state on tep event

struct mcpwm_brake_config_t::[anonymous] flags

Extra flags for brake configuration

struct mcpwm_operator_event_callbacks_t

Group of supported MCPWM operator event callbacks.

备注

The callbacks are all running under ISR environment

Public Members

mcpwm_brake_event_cb_t on_brake_cbc

callback function when mcpwm operator brakes in CBC

mcpwm_brake_event_cb_t on_brake_ost

callback function when mcpwm operator brakes in OST

struct mcpwm_carrier_config_t

MCPWM carrier configuration structure.

Public Members

mcpwm_carrier_clock_source_t clk_src

MCPWM carrier clock source

uint32_t frequency_hz

Carrier frequency in Hz

uint32_t first_pulse_duration_us

The duration of the first PWM pulse, in us

float duty_cycle

Carrier duty cycle

uint32_t invert_before_modulate

Invert the raw signal

uint32_t invert_after_modulate

Invert the modulated signal

struct mcpwm_carrier_config_t::[anonymous] flags

Extra flags for carrier configuration

Header File

  • components/esp_driver_mcpwm/include/driver/mcpwm_cmpr.h

  • This header file can be included with:

    #include "driver/mcpwm_cmpr.h"
    
  • This header file is a part of the API provided by the esp_driver_mcpwm component. To declare that your component depends on esp_driver_mcpwm, add the following to your CMakeLists.txt:

    REQUIRES esp_driver_mcpwm
    

    or

    PRIV_REQUIRES esp_driver_mcpwm
    

Functions

esp_err_t mcpwm_new_comparator(mcpwm_oper_handle_t oper, const mcpwm_comparator_config_t *config, mcpwm_cmpr_handle_t *ret_cmpr)

Create MCPWM comparator.

参数
  • oper -- [in] MCPWM operator, allocated by mcpwm_new_operator(), the new comparator will be allocated from this operator

  • config -- [in] MCPWM comparator configuration

  • ret_cmpr -- [out] Returned MCPWM comparator

返回

  • ESP_OK: Create MCPWM comparator successfully

  • ESP_ERR_INVALID_ARG: Create MCPWM comparator failed because of invalid argument

  • ESP_ERR_NO_MEM: Create MCPWM comparator failed because out of memory

  • ESP_ERR_NOT_FOUND: Create MCPWM comparator failed because can't find free resource

  • ESP_FAIL: Create MCPWM comparator failed because of other error

esp_err_t mcpwm_del_comparator(mcpwm_cmpr_handle_t cmpr)

Delete MCPWM comparator.

参数

cmpr -- [in] MCPWM comparator handle, allocated by mcpwm_new_comparator()

返回

  • ESP_OK: Delete MCPWM comparator successfully

  • ESP_ERR_INVALID_ARG: Delete MCPWM comparator failed because of invalid argument

  • ESP_FAIL: Delete MCPWM comparator failed because of other error

esp_err_t mcpwm_comparator_register_event_callbacks(mcpwm_cmpr_handle_t cmpr, const mcpwm_comparator_event_callbacks_t *cbs, void *user_data)

Set event callbacks for MCPWM comparator.

备注

User can deregister a previously registered callback by calling this function and setting the callback member in the cbs structure to NULL.

参数
  • cmpr -- [in] MCPWM comparator handle, allocated by mcpwm_new_comparator()

  • cbs -- [in] Group of callback functions

  • user_data -- [in] User data, which will be passed to callback functions directly

返回

  • ESP_OK: Set event callbacks successfully

  • ESP_ERR_INVALID_ARG: Set event callbacks failed because of invalid argument

  • ESP_FAIL: Set event callbacks failed because of other error

esp_err_t mcpwm_comparator_set_compare_value(mcpwm_cmpr_handle_t cmpr, uint32_t cmp_ticks)

Set MCPWM comparator's compare value.

参数
  • cmpr -- [in] MCPWM comparator handle, allocated by mcpwm_new_comparator()

  • cmp_ticks -- [in] The new compare value

返回

  • ESP_OK: Set MCPWM compare value successfully

  • ESP_ERR_INVALID_ARG: Set MCPWM compare value failed because of invalid argument (e.g. the cmp_ticks is out of range)

  • ESP_ERR_INVALID_STATE: Set MCPWM compare value failed because the operator doesn't have a timer connected

  • ESP_FAIL: Set MCPWM compare value failed because of other error

Structures

struct mcpwm_comparator_config_t

MCPWM comparator configuration.

Public Members

int intr_priority

MCPWM comparator interrupt priority, if set to 0, the driver will try to allocate an interrupt with a relative low priority (1,2,3)

uint32_t update_cmp_on_tez

Whether to update compare value when timer count equals to zero (tez)

uint32_t update_cmp_on_tep

Whether to update compare value when timer count equals to peak (tep)

uint32_t update_cmp_on_sync

Whether to update compare value on sync event

struct mcpwm_comparator_config_t::[anonymous] flags

Extra configuration flags for comparator

struct mcpwm_comparator_event_callbacks_t

Group of supported MCPWM compare event callbacks.

备注

The callbacks are all running under ISR environment

Public Members

mcpwm_compare_event_cb_t on_reach

ISR callback function which would be invoked when counter reaches compare value

Header File

  • components/esp_driver_mcpwm/include/driver/mcpwm_gen.h

  • This header file can be included with:

    #include "driver/mcpwm_gen.h"
    
  • This header file is a part of the API provided by the esp_driver_mcpwm component. To declare that your component depends on esp_driver_mcpwm, add the following to your CMakeLists.txt:

    REQUIRES esp_driver_mcpwm
    

    or

    PRIV_REQUIRES esp_driver_mcpwm
    

Functions

esp_err_t mcpwm_new_generator(mcpwm_oper_handle_t oper, const mcpwm_generator_config_t *config, mcpwm_gen_handle_t *ret_gen)

Allocate MCPWM generator from given operator.

参数
  • oper -- [in] MCPWM operator, allocated by mcpwm_new_operator()

  • config -- [in] MCPWM generator configuration

  • ret_gen -- [out] Returned MCPWM generator

返回

  • ESP_OK: Create MCPWM generator successfully

  • ESP_ERR_INVALID_ARG: Create MCPWM generator failed because of invalid argument

  • ESP_ERR_NO_MEM: Create MCPWM generator failed because out of memory

  • ESP_ERR_NOT_FOUND: Create MCPWM generator failed because can't find free resource

  • ESP_FAIL: Create MCPWM generator failed because of other error

esp_err_t mcpwm_del_generator(mcpwm_gen_handle_t gen)

Delete MCPWM generator.

参数

gen -- [in] MCPWM generator handle, allocated by mcpwm_new_generator()

返回

  • ESP_OK: Delete MCPWM generator successfully

  • ESP_ERR_INVALID_ARG: Delete MCPWM generator failed because of invalid argument

  • ESP_FAIL: Delete MCPWM generator failed because of other error

esp_err_t mcpwm_generator_set_force_level(mcpwm_gen_handle_t gen, int level, bool hold_on)

Set force level for MCPWM generator.

备注

The force level will be applied to the generator immediately, regardless any other events that would change the generator's behaviour.

备注

If the hold_on is true, the force level will retain forever, until user removes the force level by setting the force level to -1.

备注

If the hold_on is false, the force level can be overridden by the next event action.

备注

The force level set by this function can be inverted by GPIO matrix or dead-time module. So the level set here doesn't equal to the final output level.

参数
  • gen -- [in] MCPWM generator handle, allocated by mcpwm_new_generator()

  • level -- [in] GPIO level to be applied to MCPWM generator, specially, -1 means to remove the force level

  • hold_on -- [in] Whether the forced PWM level should retain (i.e. will remain unchanged until manually remove the force level)

返回

  • ESP_OK: Set force level for MCPWM generator successfully

  • ESP_ERR_INVALID_ARG: Set force level for MCPWM generator failed because of invalid argument

  • ESP_FAIL: Set force level for MCPWM generator failed because of other error

esp_err_t mcpwm_generator_set_action_on_timer_event(mcpwm_gen_handle_t gen, mcpwm_gen_timer_event_action_t ev_act)

Set generator action on MCPWM timer event.

参数
  • gen -- [in] MCPWM generator handle, allocated by mcpwm_new_generator()

  • ev_act -- [in] MCPWM timer event action, can be constructed by MCPWM_GEN_TIMER_EVENT_ACTION helper macro

返回

  • ESP_OK: Set generator action successfully

  • ESP_ERR_INVALID_ARG: Set generator action failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Set generator action failed because of timer is not connected to operator

  • ESP_FAIL: Set generator action failed because of other error

esp_err_t mcpwm_generator_set_actions_on_timer_event(mcpwm_gen_handle_t gen, mcpwm_gen_timer_event_action_t ev_act, ...)

Set generator actions on multiple MCPWM timer events.

备注

This is an aggregation version of mcpwm_generator_set_action_on_timer_event, which allows user to set multiple actions in one call.

参数
  • gen -- [in] MCPWM generator handle, allocated by mcpwm_new_generator()

  • ev_act -- [in] MCPWM timer event action list, must be terminated by MCPWM_GEN_TIMER_EVENT_ACTION_END()

返回

  • ESP_OK: Set generator actions successfully

  • ESP_ERR_INVALID_ARG: Set generator actions failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Set generator actions failed because of timer is not connected to operator

  • ESP_FAIL: Set generator actions failed because of other error

esp_err_t mcpwm_generator_set_action_on_compare_event(mcpwm_gen_handle_t generator, mcpwm_gen_compare_event_action_t ev_act)

Set generator action on MCPWM compare event.

参数
  • generator -- [in] MCPWM generator handle, allocated by mcpwm_new_generator()

  • ev_act -- [in] MCPWM compare event action, can be constructed by MCPWM_GEN_COMPARE_EVENT_ACTION helper macro

返回

  • ESP_OK: Set generator action successfully

  • ESP_ERR_INVALID_ARG: Set generator action failed because of invalid argument

  • ESP_FAIL: Set generator action failed because of other error

esp_err_t mcpwm_generator_set_actions_on_compare_event(mcpwm_gen_handle_t generator, mcpwm_gen_compare_event_action_t ev_act, ...)

Set generator actions on multiple MCPWM compare events.

备注

This is an aggregation version of mcpwm_generator_set_action_on_compare_event, which allows user to set multiple actions in one call.

参数
  • generator -- [in] MCPWM generator handle, allocated by mcpwm_new_generator()

  • ev_act -- [in] MCPWM compare event action list, must be terminated by MCPWM_GEN_COMPARE_EVENT_ACTION_END()

返回

  • ESP_OK: Set generator actions successfully

  • ESP_ERR_INVALID_ARG: Set generator actions failed because of invalid argument

  • ESP_FAIL: Set generator actions failed because of other error

esp_err_t mcpwm_generator_set_action_on_brake_event(mcpwm_gen_handle_t generator, mcpwm_gen_brake_event_action_t ev_act)

Set generator action on MCPWM brake event.

参数
  • generator -- [in] MCPWM generator handle, allocated by mcpwm_new_generator()

  • ev_act -- [in] MCPWM brake event action, can be constructed by MCPWM_GEN_BRAKE_EVENT_ACTION helper macro

返回

  • ESP_OK: Set generator action successfully

  • ESP_ERR_INVALID_ARG: Set generator action failed because of invalid argument

  • ESP_FAIL: Set generator action failed because of other error

esp_err_t mcpwm_generator_set_actions_on_brake_event(mcpwm_gen_handle_t generator, mcpwm_gen_brake_event_action_t ev_act, ...)

Set generator actions on multiple MCPWM brake events.

备注

This is an aggregation version of mcpwm_generator_set_action_on_brake_event, which allows user to set multiple actions in one call.

参数
  • generator -- [in] MCPWM generator handle, allocated by mcpwm_new_generator()

  • ev_act -- [in] MCPWM brake event action list, must be terminated by MCPWM_GEN_BRAKE_EVENT_ACTION_END()

返回

  • ESP_OK: Set generator actions successfully

  • ESP_ERR_INVALID_ARG: Set generator actions failed because of invalid argument

  • ESP_FAIL: Set generator actions failed because of other error

esp_err_t mcpwm_generator_set_action_on_fault_event(mcpwm_gen_handle_t generator, mcpwm_gen_fault_event_action_t ev_act)

Set generator action on MCPWM Fault event.

参数
  • generator -- [in] MCPWM generator handle, allocated by mcpwm_new_generator()

  • ev_act -- [in] MCPWM trigger event action, can be constructed by MCPWM_GEN_FAULT_EVENT_ACTION helper macro

返回

  • ESP_OK: Set generator action successfully

  • ESP_ERR_INVALID_ARG: Set generator action failed because of invalid argument

  • ESP_FAIL: Set generator action failed because of other error

esp_err_t mcpwm_generator_set_action_on_sync_event(mcpwm_gen_handle_t generator, mcpwm_gen_sync_event_action_t ev_act)

Set generator action on MCPWM Sync event.

备注

The trigger only support one sync action, regardless of the kinds. Should not call this function more than once.

参数
  • generator -- [in] MCPWM generator handle, allocated by mcpwm_new_generator()

  • ev_act -- [in] MCPWM trigger event action, can be constructed by MCPWM_GEN_SYNC_EVENT_ACTION helper macro

返回

  • ESP_OK: Set generator action successfully

  • ESP_ERR_INVALID_ARG: Set generator action failed because of invalid argument

  • ESP_FAIL: Set generator action failed because of other error

esp_err_t mcpwm_generator_set_dead_time(mcpwm_gen_handle_t in_generator, mcpwm_gen_handle_t out_generator, const mcpwm_dead_time_config_t *config)

Set dead time for MCPWM generator.

备注

Due to a hardware limitation, you can't set rising edge delay for both MCPWM generator 0 and 1 at the same time, otherwise, there will be a conflict inside the dead time module. The same goes for the falling edge setting. But you can set both the rising edge and falling edge delay for the same MCPWM generator.

参数
  • in_generator -- [in] MCPWM generator, before adding the dead time

  • out_generator -- [in] MCPWM generator, after adding the dead time

  • config -- [in] MCPWM dead time configuration

返回

  • ESP_OK: Set dead time for MCPWM generator successfully

  • ESP_ERR_INVALID_ARG: Set dead time for MCPWM generator failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Set dead time for MCPWM generator failed because of invalid state (e.g. delay module is already in use by other generator)

  • ESP_FAIL: Set dead time for MCPWM generator failed because of other error

Structures

struct mcpwm_generator_config_t

MCPWM generator configuration.

Public Members

int gen_gpio_num

The GPIO number used to output the PWM signal

uint32_t invert_pwm

Whether to invert the PWM signal (done by GPIO matrix)

uint32_t io_loop_back

For debug/test, the signal output from the GPIO will be fed to the input path as well

uint32_t io_od_mode

Configure the GPIO as open-drain mode

uint32_t pull_up

Whether to pull up internally

uint32_t pull_down

Whether to pull down internally

struct mcpwm_generator_config_t::[anonymous] flags

Extra configuration flags for generator

struct mcpwm_gen_timer_event_action_t

Generator action on specific timer event.

Public Members

mcpwm_timer_direction_t direction

Timer direction

mcpwm_timer_event_t event

Timer event

mcpwm_generator_action_t action

Generator action should perform

struct mcpwm_gen_compare_event_action_t

Generator action on specific comparator event.

Public Members

mcpwm_timer_direction_t direction

Timer direction

mcpwm_cmpr_handle_t comparator

Comparator handle

mcpwm_generator_action_t action

Generator action should perform

struct mcpwm_gen_brake_event_action_t

Generator action on specific brake event.

Public Members

mcpwm_timer_direction_t direction

Timer direction

mcpwm_operator_brake_mode_t brake_mode

Brake mode

mcpwm_generator_action_t action

Generator action should perform

struct mcpwm_gen_fault_event_action_t

Generator action on specific fault event.

Public Members

mcpwm_timer_direction_t direction

Timer direction

mcpwm_fault_handle_t fault

Which fault as the trigger. Only support GPIO fault

mcpwm_generator_action_t action

Generator action should perform

struct mcpwm_gen_sync_event_action_t

Generator action on specific sync event.

Public Members

mcpwm_timer_direction_t direction

Timer direction

mcpwm_sync_handle_t sync

Which sync as the trigger

mcpwm_generator_action_t action

Generator action should perform

struct mcpwm_dead_time_config_t

MCPWM dead time configuration structure.

Public Members

uint32_t posedge_delay_ticks

delay time applied to rising edge, 0 means no rising delay time

uint32_t negedge_delay_ticks

delay time applied to falling edge, 0 means no falling delay time

uint32_t invert_output

Invert the signal after applied the dead time

struct mcpwm_dead_time_config_t::[anonymous] flags

Extra flags for dead time configuration

Macros

MCPWM_GEN_TIMER_EVENT_ACTION(dir, ev, act)

Help macros to construct a mcpwm_gen_timer_event_action_t entry.

MCPWM_GEN_TIMER_EVENT_ACTION_END()
MCPWM_GEN_COMPARE_EVENT_ACTION(dir, cmp, act)

Help macros to construct a mcpwm_gen_compare_event_action_t entry.

MCPWM_GEN_COMPARE_EVENT_ACTION_END()
MCPWM_GEN_BRAKE_EVENT_ACTION(dir, mode, act)

Help macros to construct a mcpwm_gen_brake_event_action_t entry.

MCPWM_GEN_BRAKE_EVENT_ACTION_END()
MCPWM_GEN_FAULT_EVENT_ACTION(dir, flt, act)

Help macros to construct a mcpwm_gen_fault_event_action_t entry.

MCPWM_GEN_SYNC_EVENT_ACTION(dir, syn, act)

Help macros to construct a mcpwm_gen_sync_event_action_t entry.

Header File

  • components/esp_driver_mcpwm/include/driver/mcpwm_fault.h

  • This header file can be included with:

    #include "driver/mcpwm_fault.h"
    
  • This header file is a part of the API provided by the esp_driver_mcpwm component. To declare that your component depends on esp_driver_mcpwm, add the following to your CMakeLists.txt:

    REQUIRES esp_driver_mcpwm
    

    or

    PRIV_REQUIRES esp_driver_mcpwm
    

Functions

esp_err_t mcpwm_new_gpio_fault(const mcpwm_gpio_fault_config_t *config, mcpwm_fault_handle_t *ret_fault)

Create MCPWM GPIO fault.

参数
  • config -- [in] MCPWM GPIO fault configuration

  • ret_fault -- [out] Returned GPIO fault handle

返回

  • ESP_OK: Create MCPWM GPIO fault successfully

  • ESP_ERR_INVALID_ARG: Create MCPWM GPIO fault failed because of invalid argument

  • ESP_ERR_NO_MEM: Create MCPWM GPIO fault failed because out of memory

  • ESP_ERR_NOT_FOUND: Create MCPWM GPIO fault failed because can't find free resource

  • ESP_FAIL: Create MCPWM GPIO fault failed because of other error

esp_err_t mcpwm_new_soft_fault(const mcpwm_soft_fault_config_t *config, mcpwm_fault_handle_t *ret_fault)

Create MCPWM software fault.

参数
  • config -- [in] MCPWM software fault configuration

  • ret_fault -- [out] Returned software fault handle

返回

  • ESP_OK: Create MCPWM software fault successfully

  • ESP_ERR_INVALID_ARG: Create MCPWM software fault failed because of invalid argument

  • ESP_ERR_NO_MEM: Create MCPWM software fault failed because out of memory

  • ESP_FAIL: Create MCPWM software fault failed because of other error

esp_err_t mcpwm_del_fault(mcpwm_fault_handle_t fault)

Delete MCPWM fault.

参数

fault -- [in] MCPWM fault handle allocated by mcpwm_new_gpio_fault() or mcpwm_new_soft_fault()

返回

  • ESP_OK: Delete MCPWM fault successfully

  • ESP_ERR_INVALID_ARG: Delete MCPWM fault failed because of invalid argument

  • ESP_FAIL: Delete MCPWM fault failed because of other error

esp_err_t mcpwm_soft_fault_activate(mcpwm_fault_handle_t fault)

Activate the software fault, trigger the fault event for once.

参数

fault -- [in] MCPWM soft fault, allocated by mcpwm_new_soft_fault()

返回

  • ESP_OK: Trigger MCPWM software fault event successfully

  • ESP_ERR_INVALID_ARG: Trigger MCPWM software fault event failed because of invalid argument

  • ESP_FAIL: Trigger MCPWM software fault event failed because of other error

esp_err_t mcpwm_fault_register_event_callbacks(mcpwm_fault_handle_t fault, const mcpwm_fault_event_callbacks_t *cbs, void *user_data)

Set event callbacks for MCPWM fault.

备注

User can deregister a previously registered callback by calling this function and setting the callback member in the cbs structure to NULL.

参数
  • fault -- [in] MCPWM GPIO fault handle, allocated by mcpwm_new_gpio_fault()

  • cbs -- [in] Group of callback functions

  • user_data -- [in] User data, which will be passed to callback functions directly

返回

  • ESP_OK: Set event callbacks successfully

  • ESP_ERR_INVALID_ARG: Set event callbacks failed because of invalid argument

  • ESP_FAIL: Set event callbacks failed because of other error

Structures

struct mcpwm_gpio_fault_config_t

MCPWM GPIO fault configuration structure.

Public Members

int group_id

In which MCPWM group that the GPIO fault belongs to

int intr_priority

MCPWM GPIO fault interrupt priority, if set to 0, the driver will try to allocate an interrupt with a relative low priority (1,2,3)

int gpio_num

GPIO used by the fault signal

uint32_t active_level

On which level the fault signal is treated as active

uint32_t io_loop_back

For debug/test, the signal output from the GPIO will be fed to the input path as well

uint32_t pull_up

Whether to pull up internally

uint32_t pull_down

Whether to pull down internally

struct mcpwm_gpio_fault_config_t::[anonymous] flags

Extra configuration flags for GPIO fault

struct mcpwm_soft_fault_config_t

MCPWM software fault configuration structure.

struct mcpwm_fault_event_callbacks_t

Group of supported MCPWM fault event callbacks.

备注

The callbacks are all running under ISR environment

Public Members

mcpwm_fault_event_cb_t on_fault_enter

ISR callback function that would be invoked when fault signal becomes active

mcpwm_fault_event_cb_t on_fault_exit

ISR callback function that would be invoked when fault signal becomes inactive

Header File

  • components/esp_driver_mcpwm/include/driver/mcpwm_sync.h

  • This header file can be included with:

    #include "driver/mcpwm_sync.h"
    
  • This header file is a part of the API provided by the esp_driver_mcpwm component. To declare that your component depends on esp_driver_mcpwm, add the following to your CMakeLists.txt:

    REQUIRES esp_driver_mcpwm
    

    or

    PRIV_REQUIRES esp_driver_mcpwm
    

Functions

esp_err_t mcpwm_new_timer_sync_src(mcpwm_timer_handle_t timer, const mcpwm_timer_sync_src_config_t *config, mcpwm_sync_handle_t *ret_sync)

Create MCPWM timer sync source.

参数
  • timer -- [in] MCPWM timer handle, allocated by mcpwm_new_timer()

  • config -- [in] MCPWM timer sync source configuration

  • ret_sync -- [out] Returned MCPWM sync handle

返回

  • ESP_OK: Create MCPWM timer sync source successfully

  • ESP_ERR_INVALID_ARG: Create MCPWM timer sync source failed because of invalid argument

  • ESP_ERR_NO_MEM: Create MCPWM timer sync source failed because out of memory

  • ESP_ERR_INVALID_STATE: Create MCPWM timer sync source failed because the timer has created a sync source before

  • ESP_FAIL: Create MCPWM timer sync source failed because of other error

esp_err_t mcpwm_new_gpio_sync_src(const mcpwm_gpio_sync_src_config_t *config, mcpwm_sync_handle_t *ret_sync)

Create MCPWM GPIO sync source.

参数
  • config -- [in] MCPWM GPIO sync source configuration

  • ret_sync -- [out] Returned MCPWM GPIO sync handle

返回

  • ESP_OK: Create MCPWM GPIO sync source successfully

  • ESP_ERR_INVALID_ARG: Create MCPWM GPIO sync source failed because of invalid argument

  • ESP_ERR_NO_MEM: Create MCPWM GPIO sync source failed because out of memory

  • ESP_ERR_NOT_FOUND: Create MCPWM GPIO sync source failed because can't find free resource

  • ESP_FAIL: Create MCPWM GPIO sync source failed because of other error

esp_err_t mcpwm_new_soft_sync_src(const mcpwm_soft_sync_config_t *config, mcpwm_sync_handle_t *ret_sync)

Create MCPWM software sync source.

参数
  • config -- [in] MCPWM software sync source configuration

  • ret_sync -- [out] Returned software sync handle

返回

  • ESP_OK: Create MCPWM software sync successfully

  • ESP_ERR_INVALID_ARG: Create MCPWM software sync failed because of invalid argument

  • ESP_ERR_NO_MEM: Create MCPWM software sync failed because out of memory

  • ESP_FAIL: Create MCPWM software sync failed because of other error

esp_err_t mcpwm_del_sync_src(mcpwm_sync_handle_t sync)

Delete MCPWM sync source.

参数

sync -- [in] MCPWM sync handle, allocated by mcpwm_new_timer_sync_src() or mcpwm_new_gpio_sync_src() or mcpwm_new_soft_sync_src()

返回

  • ESP_OK: Delete MCPWM sync source successfully

  • ESP_ERR_INVALID_ARG: Delete MCPWM sync source failed because of invalid argument

  • ESP_FAIL: Delete MCPWM sync source failed because of other error

esp_err_t mcpwm_soft_sync_activate(mcpwm_sync_handle_t sync)

Activate the software sync, trigger the sync event for once.

参数

sync -- [in] MCPWM soft sync handle, allocated by mcpwm_new_soft_sync_src()

返回

  • ESP_OK: Trigger MCPWM software sync event successfully

  • ESP_ERR_INVALID_ARG: Trigger MCPWM software sync event failed because of invalid argument

  • ESP_FAIL: Trigger MCPWM software sync event failed because of other error

Structures

struct mcpwm_timer_sync_src_config_t

MCPWM timer sync source configuration.

Public Members

mcpwm_timer_event_t timer_event

Timer event, upon which MCPWM timer will generate the sync signal

uint32_t propagate_input_sync

The input sync signal would be routed to its sync output

struct mcpwm_timer_sync_src_config_t::[anonymous] flags

Extra configuration flags for timer sync source

struct mcpwm_gpio_sync_src_config_t

MCPWM GPIO sync source configuration.

Public Members

int group_id

MCPWM group ID

int gpio_num

GPIO used by sync source

uint32_t active_neg

Whether the sync signal is active on negedge, by default, the sync signal's posedge is treated as active

uint32_t io_loop_back

For debug/test, the signal output from the GPIO will be fed to the input path as well

uint32_t pull_up

Whether to pull up internally

uint32_t pull_down

Whether to pull down internally

struct mcpwm_gpio_sync_src_config_t::[anonymous] flags

Extra configuration flags for GPIO sync source

struct mcpwm_soft_sync_config_t

MCPWM software sync configuration structure.

Header File

  • components/esp_driver_mcpwm/include/driver/mcpwm_cap.h

  • This header file can be included with:

    #include "driver/mcpwm_cap.h"
    
  • This header file is a part of the API provided by the esp_driver_mcpwm component. To declare that your component depends on esp_driver_mcpwm, add the following to your CMakeLists.txt:

    REQUIRES esp_driver_mcpwm
    

    or

    PRIV_REQUIRES esp_driver_mcpwm
    

Functions

esp_err_t mcpwm_new_capture_timer(const mcpwm_capture_timer_config_t *config, mcpwm_cap_timer_handle_t *ret_cap_timer)

Create MCPWM capture timer.

参数
  • config -- [in] MCPWM capture timer configuration

  • ret_cap_timer -- [out] Returned MCPWM capture timer handle

返回

  • ESP_OK: Create MCPWM capture timer successfully

  • ESP_ERR_INVALID_ARG: Create MCPWM capture timer failed because of invalid argument

  • ESP_ERR_NO_MEM: Create MCPWM capture timer failed because out of memory

  • ESP_ERR_NOT_FOUND: Create MCPWM capture timer failed because can't find free resource

  • ESP_FAIL: Create MCPWM capture timer failed because of other error

esp_err_t mcpwm_del_capture_timer(mcpwm_cap_timer_handle_t cap_timer)

Delete MCPWM capture timer.

参数

cap_timer -- [in] MCPWM capture timer, allocated by mcpwm_new_capture_timer()

返回

  • ESP_OK: Delete MCPWM capture timer successfully

  • ESP_ERR_INVALID_ARG: Delete MCPWM capture timer failed because of invalid argument

  • ESP_FAIL: Delete MCPWM capture timer failed because of other error

esp_err_t mcpwm_capture_timer_enable(mcpwm_cap_timer_handle_t cap_timer)

Enable MCPWM capture timer.

参数

cap_timer -- [in] MCPWM capture timer handle, allocated by mcpwm_new_capture_timer()

返回

  • ESP_OK: Enable MCPWM capture timer successfully

  • ESP_ERR_INVALID_ARG: Enable MCPWM capture timer failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Enable MCPWM capture timer failed because timer is enabled already

  • ESP_FAIL: Enable MCPWM capture timer failed because of other error

esp_err_t mcpwm_capture_timer_disable(mcpwm_cap_timer_handle_t cap_timer)

Disable MCPWM capture timer.

参数

cap_timer -- [in] MCPWM capture timer handle, allocated by mcpwm_new_capture_timer()

返回

  • ESP_OK: Disable MCPWM capture timer successfully

  • ESP_ERR_INVALID_ARG: Disable MCPWM capture timer failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Disable MCPWM capture timer failed because timer is disabled already

  • ESP_FAIL: Disable MCPWM capture timer failed because of other error

esp_err_t mcpwm_capture_timer_start(mcpwm_cap_timer_handle_t cap_timer)

Start MCPWM capture timer.

参数

cap_timer -- [in] MCPWM capture timer, allocated by mcpwm_new_capture_timer()

返回

  • ESP_OK: Start MCPWM capture timer successfully

  • ESP_ERR_INVALID_ARG: Start MCPWM capture timer failed because of invalid argument

  • ESP_FAIL: Start MCPWM capture timer failed because of other error

esp_err_t mcpwm_capture_timer_stop(mcpwm_cap_timer_handle_t cap_timer)

Start MCPWM capture timer.

参数

cap_timer -- [in] MCPWM capture timer, allocated by mcpwm_new_capture_timer()

返回

  • ESP_OK: Stop MCPWM capture timer successfully

  • ESP_ERR_INVALID_ARG: Stop MCPWM capture timer failed because of invalid argument

  • ESP_FAIL: Stop MCPWM capture timer failed because of other error

esp_err_t mcpwm_capture_timer_get_resolution(mcpwm_cap_timer_handle_t cap_timer, uint32_t *out_resolution)

Get MCPWM capture timer resolution, in Hz.

参数
  • cap_timer -- [in] MCPWM capture timer, allocated by mcpwm_new_capture_timer()

  • out_resolution -- [out] Returned capture timer resolution, in Hz

返回

  • ESP_OK: Get capture timer resolution successfully

  • ESP_ERR_INVALID_ARG: Get capture timer resolution failed because of invalid argument

  • ESP_FAIL: Get capture timer resolution failed because of other error

esp_err_t mcpwm_capture_timer_set_phase_on_sync(mcpwm_cap_timer_handle_t cap_timer, const mcpwm_capture_timer_sync_phase_config_t *config)

Set sync phase for MCPWM capture timer.

参数
  • cap_timer -- [in] MCPWM capture timer, allocated by mcpwm_new_capture_timer()

  • config -- [in] MCPWM capture timer sync phase configuration

返回

  • ESP_OK: Set sync phase for MCPWM capture timer successfully

  • ESP_ERR_INVALID_ARG: Set sync phase for MCPWM capture timer failed because of invalid argument

  • ESP_FAIL: Set sync phase for MCPWM capture timer failed because of other error

esp_err_t mcpwm_new_capture_channel(mcpwm_cap_timer_handle_t cap_timer, const mcpwm_capture_channel_config_t *config, mcpwm_cap_channel_handle_t *ret_cap_channel)

Create MCPWM capture channel.

备注

The created capture channel won't be enabled until calling mcpwm_capture_channel_enable

参数
  • cap_timer -- [in] MCPWM capture timer, allocated by mcpwm_new_capture_timer(), will be connected to the new capture channel

  • config -- [in] MCPWM capture channel configuration

  • ret_cap_channel -- [out] Returned MCPWM capture channel

返回

  • ESP_OK: Create MCPWM capture channel successfully

  • ESP_ERR_INVALID_ARG: Create MCPWM capture channel failed because of invalid argument

  • ESP_ERR_NO_MEM: Create MCPWM capture channel failed because out of memory

  • ESP_ERR_NOT_FOUND: Create MCPWM capture channel failed because can't find free resource

  • ESP_FAIL: Create MCPWM capture channel failed because of other error

esp_err_t mcpwm_del_capture_channel(mcpwm_cap_channel_handle_t cap_channel)

Delete MCPWM capture channel.

参数

cap_channel -- [in] MCPWM capture channel handle, allocated by mcpwm_new_capture_channel()

返回

  • ESP_OK: Delete MCPWM capture channel successfully

  • ESP_ERR_INVALID_ARG: Delete MCPWM capture channel failed because of invalid argument

  • ESP_FAIL: Delete MCPWM capture channel failed because of other error

esp_err_t mcpwm_capture_channel_enable(mcpwm_cap_channel_handle_t cap_channel)

Enable MCPWM capture channel.

备注

This function will transit the channel state from init to enable.

备注

This function will enable the interrupt service, if it's lazy installed in mcpwm_capture_channel_register_event_callbacks().

参数

cap_channel -- [in] MCPWM capture channel handle, allocated by mcpwm_new_capture_channel()

返回

  • ESP_OK: Enable MCPWM capture channel successfully

  • ESP_ERR_INVALID_ARG: Enable MCPWM capture channel failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Enable MCPWM capture channel failed because the channel is already enabled

  • ESP_FAIL: Enable MCPWM capture channel failed because of other error

esp_err_t mcpwm_capture_channel_disable(mcpwm_cap_channel_handle_t cap_channel)

Disable MCPWM capture channel.

参数

cap_channel -- [in] MCPWM capture channel handle, allocated by mcpwm_new_capture_channel()

返回

  • ESP_OK: Disable MCPWM capture channel successfully

  • ESP_ERR_INVALID_ARG: Disable MCPWM capture channel failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Disable MCPWM capture channel failed because the channel is not enabled yet

  • ESP_FAIL: Disable MCPWM capture channel failed because of other error

esp_err_t mcpwm_capture_channel_register_event_callbacks(mcpwm_cap_channel_handle_t cap_channel, const mcpwm_capture_event_callbacks_t *cbs, void *user_data)

Set event callbacks for MCPWM capture channel.

备注

The first call to this function needs to be before the call to mcpwm_capture_channel_enable

备注

User can deregister a previously registered callback by calling this function and setting the callback member in the cbs structure to NULL.

参数
  • cap_channel -- [in] MCPWM capture channel handle, allocated by mcpwm_new_capture_channel()

  • cbs -- [in] Group of callback functions

  • user_data -- [in] User data, which will be passed to callback functions directly

返回

  • ESP_OK: Set event callbacks successfully

  • ESP_ERR_INVALID_ARG: Set event callbacks failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Set event callbacks failed because the channel is not in init state

  • ESP_FAIL: Set event callbacks failed because of other error

esp_err_t mcpwm_capture_channel_trigger_soft_catch(mcpwm_cap_channel_handle_t cap_channel)

Trigger a catch by software.

参数

cap_channel -- [in] MCPWM capture channel handle, allocated by mcpwm_new_capture_channel()

返回

  • ESP_OK: Trigger software catch successfully

  • ESP_ERR_INVALID_ARG: Trigger software catch failed because of invalid argument

  • ESP_ERR_INVALID_STATE: Trigger software catch failed because the channel is not enabled yet

  • ESP_FAIL: Trigger software catch failed because of other error

Structures

struct mcpwm_capture_timer_config_t

MCPWM capture timer configuration structure.

Public Members

int group_id

Specify from which group to allocate the capture timer

mcpwm_capture_clock_source_t clk_src

MCPWM capture timer clock source

uint32_t resolution_hz

Resolution of capture timer

struct mcpwm_capture_timer_sync_phase_config_t

MCPWM Capture timer sync phase configuration.

Public Members

mcpwm_sync_handle_t sync_src

The sync event source

uint32_t count_value

The count value that should lock to upon sync event

mcpwm_timer_direction_t direction

The count direction that should lock to upon sync event

struct mcpwm_capture_channel_config_t

MCPWM capture channel configuration structure.

Public Members

int gpio_num

GPIO used capturing input signal

int intr_priority

MCPWM capture interrupt priority, if set to 0, the driver will try to allocate an interrupt with a relative low priority (1,2,3)

uint32_t prescale

Prescale of input signal, effective frequency = cap_input_clk/prescale

struct mcpwm_capture_channel_config_t::extra_flags flags

Extra configuration flags for capture channel

struct extra_flags

Extra configuration flags for capture channel.

Public Members

uint32_t pos_edge

Whether to capture on positive edge

uint32_t neg_edge

Whether to capture on negative edge

uint32_t pull_up

Whether to pull up internally

uint32_t pull_down

Whether to pull down internally

uint32_t invert_cap_signal

Invert the input capture signal

uint32_t io_loop_back

For debug/test, the signal output from the GPIO will be fed to the input path as well

uint32_t keep_io_conf_at_exit

For debug/test, whether to keep the GPIO configuration when capture channel is deleted. By default, driver will reset the GPIO pin at exit.

struct mcpwm_capture_event_callbacks_t

Group of supported MCPWM capture event callbacks.

备注

The callbacks are all running under ISR environment

Public Members

mcpwm_capture_event_cb_t on_cap

Callback function that would be invoked when capture event occurred

Header File

  • components/esp_driver_mcpwm/include/driver/mcpwm_etm.h

  • This header file can be included with:

    #include "driver/mcpwm_etm.h"
    
  • This header file is a part of the API provided by the esp_driver_mcpwm component. To declare that your component depends on esp_driver_mcpwm, add the following to your CMakeLists.txt:

    REQUIRES esp_driver_mcpwm
    

    or

    PRIV_REQUIRES esp_driver_mcpwm
    

Functions

esp_err_t mcpwm_comparator_new_etm_event(mcpwm_cmpr_handle_t cmpr, const mcpwm_cmpr_etm_event_config_t *config, esp_etm_event_handle_t *out_event)

Get the ETM event for MCPWM comparator.

备注

The created ETM event object can be deleted later by calling esp_etm_del_event

参数
  • cmpr -- [in] MCPWM comparator, allocated by mcpwm_new_comparator() or mcpwm_new_event_comparator()

  • config -- [in] MCPWM ETM comparator event configuration

  • out_event -- [out] Returned ETM event handle

返回

  • ESP_OK: Get ETM event successfully

  • ESP_ERR_INVALID_ARG: Get ETM event failed because of invalid argument

  • ESP_FAIL: Get ETM event failed because of other error

Structures

struct mcpwm_cmpr_etm_event_config_t

MCPWM event comparator ETM event configuration.

Public Members

mcpwm_comparator_etm_event_type_t event_type

MCPWM comparator ETM event type

Header File

  • components/esp_driver_mcpwm/include/driver/mcpwm_types.h

  • This header file can be included with:

    #include "driver/mcpwm_types.h"
    
  • This header file is a part of the API provided by the esp_driver_mcpwm component. To declare that your component depends on esp_driver_mcpwm, add the following to your CMakeLists.txt:

    REQUIRES esp_driver_mcpwm
    

    or

    PRIV_REQUIRES esp_driver_mcpwm
    

Structures

struct mcpwm_timer_event_data_t

MCPWM timer event data.

Public Members

uint32_t count_value

MCPWM timer count value

mcpwm_timer_direction_t direction

MCPWM timer count direction

struct mcpwm_brake_event_data_t

MCPWM brake event data.

struct mcpwm_fault_event_data_t

MCPWM fault event data.

struct mcpwm_compare_event_data_t

MCPWM compare event data.

Public Members

uint32_t compare_ticks

Compare value

mcpwm_timer_direction_t direction

Count direction

struct mcpwm_capture_event_data_t

MCPWM capture event data.

Public Members

uint32_t cap_value

Captured value

mcpwm_capture_edge_t cap_edge

Capture edge

Type Definitions

typedef struct mcpwm_timer_t *mcpwm_timer_handle_t

Type of MCPWM timer handle.

typedef struct mcpwm_oper_t *mcpwm_oper_handle_t

Type of MCPWM operator handle.

typedef struct mcpwm_cmpr_t *mcpwm_cmpr_handle_t

Type of MCPWM comparator handle.

typedef struct mcpwm_gen_t *mcpwm_gen_handle_t

Type of MCPWM generator handle.

typedef struct mcpwm_fault_t *mcpwm_fault_handle_t

Type of MCPWM fault handle.

typedef struct mcpwm_sync_t *mcpwm_sync_handle_t

Type of MCPWM sync handle.

typedef struct mcpwm_cap_timer_t *mcpwm_cap_timer_handle_t

Type of MCPWM capture timer handle.

typedef struct mcpwm_cap_channel_t *mcpwm_cap_channel_handle_t

Type of MCPWM capture channel handle.

typedef bool (*mcpwm_timer_event_cb_t)(mcpwm_timer_handle_t timer, const mcpwm_timer_event_data_t *edata, void *user_ctx)

MCPWM timer event callback function.

Param timer

[in] MCPWM timer handle

Param edata

[in] MCPWM timer event data, fed by driver

Param user_ctx

[in] User data, set in mcpwm_timer_register_event_callbacks()

Return

Whether a high priority task has been waken up by this function

typedef bool (*mcpwm_brake_event_cb_t)(mcpwm_oper_handle_t oper, const mcpwm_brake_event_data_t *edata, void *user_ctx)

MCPWM operator brake event callback function.

Param oper

[in] MCPWM operator handle

Param edata

[in] MCPWM brake event data, fed by driver

Param user_ctx

[in] User data, set in mcpwm_operator_register_event_callbacks()

Return

Whether a high priority task has been waken up by this function

typedef bool (*mcpwm_fault_event_cb_t)(mcpwm_fault_handle_t fault, const mcpwm_fault_event_data_t *edata, void *user_ctx)

MCPWM fault event callback function.

Param fault

MCPWM fault handle

Param edata

MCPWM fault event data, fed by driver

Param user_ctx

User data, set in mcpwm_fault_register_event_callbacks()

Return

whether a task switch is needed after the callback returns

typedef bool (*mcpwm_compare_event_cb_t)(mcpwm_cmpr_handle_t comparator, const mcpwm_compare_event_data_t *edata, void *user_ctx)

MCPWM comparator event callback function.

Param comparator

MCPWM comparator handle

Param edata

MCPWM comparator event data, fed by driver

Param user_ctx

User data, set in mcpwm_comparator_register_event_callbacks()

Return

Whether a high priority task has been waken up by this function

typedef bool (*mcpwm_capture_event_cb_t)(mcpwm_cap_channel_handle_t cap_channel, const mcpwm_capture_event_data_t *edata, void *user_ctx)

MCPWM capture event callback function.

Param cap_channel

MCPWM capture channel handle

Param edata

MCPWM capture event data, fed by driver

Param user_ctx

User data, set in mcpwm_capture_channel_register_event_callbacks()

Return

Whether a high priority task has been waken up by this function

Header File

Type Definitions

typedef soc_periph_mcpwm_timer_clk_src_t mcpwm_timer_clock_source_t

MCPWM timer clock source.

typedef soc_periph_mcpwm_capture_clk_src_t mcpwm_capture_clock_source_t

MCPWM capture clock source.

typedef soc_periph_mcpwm_carrier_clk_src_t mcpwm_carrier_clock_source_t

MCPWM carrier clock source.

Enumerations

enum mcpwm_timer_direction_t

MCPWM timer count direction.

Values:

enumerator MCPWM_TIMER_DIRECTION_UP

Counting direction: Increase

enumerator MCPWM_TIMER_DIRECTION_DOWN

Counting direction: Decrease

enum mcpwm_timer_event_t

MCPWM timer events.

Values:

enumerator MCPWM_TIMER_EVENT_EMPTY

MCPWM timer counts to zero (i.e. counter is empty)

enumerator MCPWM_TIMER_EVENT_FULL

MCPWM timer counts to peak (i.e. counter is full)

enumerator MCPWM_TIMER_EVENT_INVALID

MCPWM timer invalid event

enum mcpwm_timer_count_mode_t

MCPWM timer count modes.

Values:

enumerator MCPWM_TIMER_COUNT_MODE_PAUSE

MCPWM timer paused

enumerator MCPWM_TIMER_COUNT_MODE_UP

MCPWM timer counting up

enumerator MCPWM_TIMER_COUNT_MODE_DOWN

MCPWM timer counting down

enumerator MCPWM_TIMER_COUNT_MODE_UP_DOWN

MCPWM timer counting up and down

enum mcpwm_timer_start_stop_cmd_t

MCPWM timer commands, specify the way to start or stop the timer.

Values:

enumerator MCPWM_TIMER_STOP_EMPTY

MCPWM timer stops when next count reaches zero

enumerator MCPWM_TIMER_STOP_FULL

MCPWM timer stops when next count reaches peak

enumerator MCPWM_TIMER_START_NO_STOP

MCPWM timer starts couting, and don't stop until received stop command

enumerator MCPWM_TIMER_START_STOP_EMPTY

MCPWM timer starts counting and stops when next count reaches zero

enumerator MCPWM_TIMER_START_STOP_FULL

MCPWM timer starts counting and stops when next count reaches peak

enum mcpwm_generator_action_t

MCPWM generator actions.

Values:

enumerator MCPWM_GEN_ACTION_KEEP

Generator action: Keep the same level

enumerator MCPWM_GEN_ACTION_LOW

Generator action: Force to low level

enumerator MCPWM_GEN_ACTION_HIGH

Generator action: Force to high level

enumerator MCPWM_GEN_ACTION_TOGGLE

Generator action: Toggle level

enum mcpwm_operator_brake_mode_t

MCPWM operator brake mode.

Values:

enumerator MCPWM_OPER_BRAKE_MODE_CBC

Brake mode: CBC (cycle by cycle)

enumerator MCPWM_OPER_BRAKE_MODE_OST

Brake mode: OST (one shot)

enumerator MCPWM_OPER_BRAKE_MODE_INVALID

MCPWM operator invalid brake mode

enum mcpwm_capture_edge_t

MCPWM capture edge.

Values:

enumerator MCPWM_CAP_EDGE_POS

Capture on the positive edge

enumerator MCPWM_CAP_EDGE_NEG

Capture on the negative edge

enum mcpwm_comparator_etm_event_type_t

MCPWM comparator specific events that supported by the ETM module.

Values:

enumerator MCPWM_CMPR_ETM_EVENT_EQUAL

The count value equals the value of comparator

enumerator MCPWM_CMPR_ETM_EVENT_MAX

Maximum number of comparator events

1(1,2,3,4,5,6,7,8,9)

不同的 ESP 芯片上的 MCPWM 资源数量可能存在差异(如组、定时器、比较器、操作器、生成器、触发器等)。详情请参见 [TRM]。当分配了超出资源数量的 MCPWM 资源时,在检测到没有可用硬件资源后,驱动程序将返回错误。请在进行 资源配置及初始化 时务必检查返回值。

2

回调函数及其调用的子函数需手动存放进 IRAM 中。