过零检测

[English]

过零信号检测驱动程序是一个设计用于分析过零信号的组件。通过检查过零信号的周期和触发边缘，它可以确定信号的有效性、无效性、是否超出预期的频率范围以及是否存在信号丢失等情况。

过零信号检测组件支持检测两种类型的过零信号。

方波形：在信号经过零时翻转当前的电平。
脉冲型：在信号经过零时生成的脉冲。

由于响应延迟等因素，该组件支持两种驱动模式，包括 GPIO 中断和 MCPWM 捕获。

用户可以灵活配置组件的驱动模式，并调整诸如有效频率范围和有效信号判断次数等参数。这提供了很高的灵活性。

该程序以事件的形式返回结果和数据，满足用户对信号进行及时处理的需求。

过零检测事件

每个零检测事件的触发条件如下表所示：

事件	触发条件
SIGNAL_RISING_EDGE	上升沿
SIGNAL_FALLING_EDGE	下降沿
SIGNAL_VALID	频率在有效范围内次数大于设置阈值
SIGNAL_INVALID	频率在无效范围内次数大于设置阈值
SIGNAL_LOST	在 100ms 内信号没有上升沿、下降沿
SIGNAL_FREQ_OUT_OF_RANGE	计算的频率在设置的频率范围之外

注意

回调函数中不能有 TaskDelay 等阻塞的操作

配置项

USE_GPTIMER : 决定是否使用 GPTimer 驱动默认使用 ESPTimer

应用示例

创建过零检测

void IRAM_ATTR zero_detection_event_cb(zero_detect_event_t zero_detect_event, zero_detect_cb_param_t *param, void *usr_data)  //User's callback API
{
    switch (zero_detect_event) {
    case SIGNAL_FREQ_OUT_OF_RANGE:
        ESP_LOGE(TAG, "SIGNAL_FREQ_OUT_OF_RANGE");
        break;
    case SIGNAL_VALID:
        ESP_LOGE(TAG, "SIGNAL_VALID");
        break;
    case SIGNAL_LOST:
        ESP_LOGE(TAG, "SIGNAL_LOST");
        break;
    default:
        break;
    }
}

// Create a zero detection and register call-back
zero_detect_config_t config = {
    .capture_pin = 2,
    .freq_range_max_hz = 65,
    .freq_range_min_hz = 45,  //Hz
    .valid_times = 6,
    .invalid_times = 5,
    .zero_signal_type = SQUARE_WAVE,
    .zero_driver_type = MCPWM_TYPE,
};
zero_detect_handle_t *g_zcds = zero_detect_create(&config);
if(NULL == g_zcds) {
    ESP_LOGE(TAG, "Zero Detection create failed");
}
zero_detect_register_cb(g_zcds, zero_detection_event_cb, NULL);

API Reference

Header File

components/zero_detection/include/zero_detection.h

Functions

zero_detect_handle_t zero_detect_create(zero_detect_config_t *config)

Create a zero detect target.

参数

config – A zero detect object to config

返回

zero_detect_handle_t A zero cross detection object

void zero_show_data(zero_detect_handle_t zcd_handle)

Show zero detect test data.

参数: zcd_handle – A zero detect handle

esp_err_t zero_detect_delete(zero_detect_handle_t zcd_handle)

Delete a zero detect device.

参数

zcd_handle – A zero detect handle

返回

ESP_OK Success
ESP_FAIL Failure

bool zero_detect_get_power_status(zero_detect_handle_t zcd_handle)

Get relay power status.

参数

zcd_handle – A zero detect handle

返回

true Power on
false Power off

bool zero_detect_singal_invaild_status(zero_detect_handle_t zcd_handle)

Get singal invaild status.

参数

zcd_handle – A zero detect handle

返回

true Signal is invaild
false Signal is vaild

zero_signal_type_t zero_detect_get_signal_type(zero_detect_handle_t zcd_handle)

Get singal type.

参数

zcd_handle – A zero detect handle

返回

SQUARE_WAVE Signal type is square
PULSE_WAVE Signal type is pulse

esp_err_t zero_detect_register_cb(zero_detect_handle_t zcd_handle, zero_cross_cb_t cb, void *usr_data)

Register zero cross detection callback.

参数

zcd_handle – A zero detect handle
cb – A callback function
usr_data – User data

返回

ESP_OK Success
ESP_FAIL Failure

Unions

union zero_detect_cb_param_t

#include <zero_detection.h>

Event callback parameters union.

Public Members

struct zero_detect_cb_param_t::signal_freq_event_data_t signal_freq_event_data: Signal freq event data struct

struct zero_detect_cb_param_t::signal_valid_event_data_t signal_valid_event_data: Signal valid event data struct

struct zero_detect_cb_param_t::signal_invalid_event_data_t signal_invalid_event_data: Signal invalid event data struct

struct zero_detect_cb_param_t::signal_rising_edge_event_data_t signal_rising_edge_event_data: Signal rising edge event data struct

struct zero_detect_cb_param_t::signal_falling_edge_event_data_t signal_falling_edge_event_data: Signal falling edge event_data

struct signal_falling_edge_event_data_t

#include <zero_detection.h>

Signal falling edge data return type.

Public Members

uint16_t valid_count: Counting when the signal is valid

uint16_t invalid_count: Counting when the signal is invalid

uint32_t full_cycle_us: Current signal cycle

struct signal_freq_event_data_t

#include <zero_detection.h>

Signal exceeds frequency range data return type.

Public Members

mcpwm_capture_edge_t cap_edge: Trigger edge of zero cross signal

uint32_t full_cycle_us: Current signal cycle

struct signal_invalid_event_data_t

#include <zero_detection.h>

Signal invalid data return type.

Public Members

mcpwm_capture_edge_t cap_edge: Trigger edge of zero cross signal

uint32_t full_cycle_us: Current signal cycle

uint16_t invalid_count: Counting when the signal is invalid

struct signal_rising_edge_event_data_t

#include <zero_detection.h>

Signal rising edge data return type.

Public Members

uint16_t valid_count: Counting when the signal is valid

uint16_t invalid_count: Counting when the signal is invalid

uint32_t full_cycle_us: Current signal cycle

struct signal_valid_event_data_t

#include <zero_detection.h>

Signal valid data return type.

Public Members

mcpwm_capture_edge_t cap_edge: Trigger edge of zero cross signal

uint32_t full_cycle_us: Current signal cycle

uint16_t valid_count: Counting when the signal is valid

Structures

struct zero_detect_config_t

User config data type.

Public Members

int32_t capture_pin: GPIO number for zero cross detect capture

uint16_t valid_times: Minimum required number of times for detecting signal validity

uint16_t invalid_times: Minimum required number of times for detecting signal invalidity

uint64_t signal_lost_time_us: Minimum required duration for detecting signal loss

zero_signal_type_t zero_signal_type: Zero Crossing Signal type

zero_driver_type_t zero_driver_type: Zero crossing driver type

double freq_range_max_hz: Maximum value of the frequency range when determining a valid signal

double freq_range_min_hz: Minimum value of the frequency range when determining a valid signal

Macros

ZERO_DETECTION_INIT_CONFIG_DEFAULT()

Type Definitions

typedef void (*zero_cross_cb_t)(zero_detect_event_t zero_detect_event, zero_detect_cb_param_t *param, void *usr_data): Callback format.

typedef void *zero_detect_handle_t

Enumerations

enum zero_detect_event_t

Zero detection events.

Values:

enumerator SIGNAL_FREQ_OUT_OF_RANGE

enumerator SIGNAL_VALID

enumerator SIGNAL_INVALID

enumerator SIGNAL_LOST

enumerator SIGNAL_RISING_EDGE

enumerator SIGNAL_FALLING_EDGE

enum zero_signal_type_t

Zero detection wave type.

Values:

enumerator SQUARE_WAVE

enumerator PULSE_WAVE

enum zero_driver_type_t

Zero detection driver type.

Values:

enumerator GPIO_TYPE: Use GPIO as driver

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