Motor Control Pulse Width Modulator (MCPWM)

ESP32 has two MCPWM units which can be used to control different types of motors. Each unit has three pairs of PWM outputs.

MCPWM Overview

MCPWM Overview

Further in documentation the outputs of a single unit are labeled PWMxA / PWMxB.

More detailed block diagram of the MCPWM unit is shown below. Each A/B pair may be clocked by any one of the three timers Timer 0, 1 and 2. The same timer may be used to clock more than one pair of PWM outputs. Each unit is also able to collect inputs such as SYNC SIGNALS, detect FAULT SIGNALS like motor overcurrent or overvoltage, as well as obtain feedback with CAPTURE SIGNALS on e.g. a rotor position.

MCPWM Block Diagram

MCPWM Block Diagram

Description of this API starts with configuration of MCPWM’s Timer and Generator submodules to provide the basic motor control functionality. Then it discusses more advanced submodules and functionalities of a Fault Handler, signal Capture and Carrier.

Contents

  • Configure a basic functionality of the outputs

  • Operate the outputs to drive a motor

  • Adjust how the motor is driven

  • Synchronize sync timers to work together

  • Capture external signals to provide additional control over the outputs

  • Use Fault Handler to detect and manage faults

  • Add a higher frequency Carrier, if output signals are passed through an isolation transformer

  • Extra configuration of Resolution.

Configure

The scope of configuration depends on the motor type, in particular how many outputs and inputs are required, and what will be the sequence of signals to drive the motor.

In this case we will describe a simple configuration to control a brushed DC motor that is using only some of the available MCPWM’s resources. An example circuit is shown below. It includes a H-Bridge to switch polarization of a voltage applied to the motor (M) and to provide sufficient current to drive it.

Example of Brushed DC Motor Control with MCPWM

Example of Brushed DC Motor Control with MCPWM

Configuration covers the following steps:

  1. Selection of a MCPWM unit that will be used to drive the motor. There are two units available on-board of ESP32 and enumerated in mcpwm_unit_t.

  2. Initialization of two GPIOs as output signals within selected unit by calling mcpwm_gpio_init(). The two output signals are typically used to command the motor to rotate right or left. All available signal options are listed in mcpwm_io_signals_t. To set more than a single pin at a time, use function mcpwm_set_pin() together with mcpwm_pin_config_t.

  3. Selection of a timer. There are three timers available within the unit. The timers are listed in mcpwm_timer_t.

  4. Setting of the timer frequency and initial duty within mcpwm_config_t structure.

  5. Setting timer resolution if necessary, by calling mcpwm_group_set_resolution() and mcpwm_timer_set_resolution()

  6. Calling of mcpwm_init() with the above parameters to make the configuration effective.

Operate

To operate a motor connected to the MCPWM unit, e.g. turn it left or right, or vary the speed, we should apply some control signals to the unit’s outputs. The outputs are organized into three pairs. Within a pair they are labeled “A” and “B” and each driven by a submodule called an “Generator”. To provide a PWM signal, the Operator itself, which contains two Generator, should be clocked by one of three available Timers. To make the API simpler, each Timer is automatically associated by the API to drive an Operator of the same index, e.g. Timer 0 is associated with Operator 0.

There are the following basic ways to control the outputs:

  • We can drive particular signal steady high or steady low with function mcpwm_set_signal_high() or mcpwm_set_signal_low(). This will make the motor to turn with a maximum speed or stop. Depending on selected output A or B the motor will rotate either right or left.

  • Another option is to drive the outputs with the PWM signal by calling mcpwm_start() or mcpwm_stop(). The motor speed will be proportional to the PWM duty.

  • To vary PWM’s duty call mcpwm_set_duty() and provide the duty value in %. Optionally, you may call mcpwm_set_duty_in_us(), if you prefer to set the duty in microseconds. Checking of currently set value is possible by calling mcpwm_get_duty(). Phase of the PWM signal may be altered by calling mcpwm_set_duty_type(). The duty is set individually for each A and B output using mcpwm_generator_t in specific function calls. The duty value refers either to high or low output signal duration. This is configured when calling mcpwm_init(), as discussed in section Configure, and selecting one of options from mcpwm_duty_type_t.

备注

Call function mcpwm_set_duty_type() every time after mcpwm_set_signal_high() or mcpwm_set_signal_low() to resume with previously set duty cycle.

Adjust

There are couple of ways to adjust a signal on the outputs and changing how the motor operates.

  • Set specific PWM frequency by calling mcpwm_set_frequency(). This may be required to adjust to electrical or mechanical characteristics of particular motor and driver. To check what frequency is set, use function mcpwm_get_frequency().

  • Introduce a dead time between outputs A and B when they are changing the state to reverse direction of the motor rotation. This is to make up for on/off switching delay of the motor driver FETs. The dead time options are defined in mcpwm_deadtime_type_t and enabled by calling mcpwm_deadtime_enable(). To disable this functionality call mcpwm_deadtime_disable().

  • Synchronize outputs of operator submodules, e.g. to get raising edge of PWM0A/B and PWM1A/B to start exactly at the same time, or shift them between each other by a given phase. Synchronization is triggered by SYNC SIGNALS shown on the block diagram of the MCPWM above, and defined in mcpwm_sync_signal_t. To attach the signal to a GPIO call mcpwm_gpio_init(). You can then enable synchronization with function mcpwm_sync_configure(). As input parameters provide MCPWM unit, timer to synchronize, the synchronization signal and a phase to delay the timer.

备注

Synchronization signals are referred to using two different enumerations. First one mcpwm_io_signals_t is used together with function mcpwm_gpio_init() when selecting a GPIO as the signal input source. The second one mcpwm_sync_signal_t is used when enabling or disabling synchronization with mcpwm_sync_configure() or mcpwm_sync_disable().

  • Vary the pattern of the A/B output signals by getting MCPWM counters to count up, down and up/down (automatically changing the count direction). Respective configuration is done when calling mcpwm_init(), as discussed in section Configure, and selecting one of counter types from mcpwm_counter_type_t. For explanation of how A/B PWM output signals are generated, see ESP32 Technical Reference Manual > Motor Control PWM (MCPWM) [PDF].

Synchronize

Each PWM timer has a synchronization input and a synchronization output. The synchronization input can be selected from other timers’ synchronization outputs or GPIO signals via the GPIO matrix. Timer’s synchronization signal can be generated from either the input sync signal or when the count value reaches peak/zero. Thus, the PWM timers can be chained together with their phase-locked. During synchronization, the PWM timer clock prescaler will reset its counter in order to synchronize the PWM timer clock.

The functionality is enabled in following steps:

  1. Make sure the PWM timer and operator are already configured so that sync will inherit its config (count mode, freq and duty).

  2. Enabling sync input of the timer by invoking mcpwm_sync_configure(), selecting desired signal input from mcpwm_sync_signal_t, and setting the desired phase range from 0 to 999 which is mapped to 0%~99.9%. 0 means zero phase is applied and output is fired at the same time. And selecting desired counting direction.

  3. Enabling one of sync event source from another timer or from external GPIO input.

To sync with another timer:

Enabling sync output of another timer by invoking mcpwm_set_timer_sync_output() and selecting desired event to generate sync output from mcpwm_timer_sync_trigger_t.

To sync with GPIO positive edge input (negative edge requires mcpwm_sync_invert_gpio_synchro()):

Configuring GPIOs to act as the sync signal inputs by calling functions mcpwm_gpio_init() or mcpwm_set_pin(), which were described in section Configure.

It’s normal condition that chained sync signal may have tens or even hundreds of nanoseconds of delay between each timer output due to hardware limitation. To sync two timers accurately it is required to have the third timer occupied to produce sync event that can be consumed parallel by other two timer, so that those two timer will have no delay between each other but have the same delay between the timer which provides events. Another solution is introducing an external GPIO event source so that all three timers can be synced together with no delay.

If not required anymore, the capture functionality may be disabled with mcpwm_sync_disable().

Capture

One of requirements of BLDC (Brushless DC, see figure below) motor control is sensing of the rotor position. To facilitate this task each MCPWM unit provides three sensing inputs together with dedicated hardware. The hardware is able to detect the input signal’s edge and measure time between signals. As result the control software is simpler and the CPU power may be used for other tasks.

Example of Brushless DC Motor Control with MCPWM

Example of Brushless DC Motor Control with MCPWM

The capture functionality may be used for other types of motors or tasks. The functionality is enabled in two steps:

  1. Configuration of GPIOs to act as the capture signal inputs by calling functions mcpwm_gpio_init() or mcpwm_set_pin(), that were described in section Configure.

  2. Enabling of the functionality itself by invoking mcpwm_capture_enable_channel(), selecting desired signal input from mcpwm_capture_channel_id_t, setting the signal edge, signal count prescaler and user callback within mcpwm_capture_config_t

Within the second step above a 32-bit capture timer is enabled. The timer runs continuously driven by the APB clock. The clock frequency is typically 80 MHz. On each capture event the capture timer’s value is stored in time-stamp register that may be then checked by calling mcpwm_capture_signal_get_value(). The edge of the last signal may be checked with mcpwm_capture_signal_get_edge(). Those data are also provided inside callback function as event data cap_event_data_t

If not required anymore, the capture functionality may be disabled with mcpwm_capture_disable_channel().

Capture prescale is different from other modules as it is applied to the input signal, not the timer source. Prescaler has maintained its own level state with the initial value set to low and is detecting the positive edge of the input signal to change its internal state. That means if two pairs of positive and negative edges are passed to input, the prescaler’s internal state will change twice. ISR will report on this internal state change, not the input signal. For example, setting prescale to 2 will generate ISR callback on each positive edge of input if both edge is selected via mcpwm_capture_config_t. Or each 2 positive edges of input if only one edge is selected though mcpwm_capture_config_t.

Fault Handler

Each unit of the MCPWM is able to sense external signals with information about failure of the motor, the motor driver or any other device connected to the MCPWM. There are three fault inputs per unit that may be routed to user selectable GPIOs. The MCPWM may be configured to perform one of four predefined actions on A/B outputs when a fault signal is received:

  • lock current state of the output

  • set the output low

  • set the output high

  • toggle the output

The user should determine possible failure modes of the motor and what action should be performed on detection of particular fault, e.g. drive all outputs low for a brushed motor, or lock current state for a stepper motor, etc. As result of this action the motor should be put into a safe state to reduce likelihood of a damage caused by the fault.

The fault handler functionality is enabled in two steps:

  1. Configuration of GPIOs to act as fault signal inputs. This is done in analogous way as described for capture signals in section above. It includes setting the signal level to trigger the fault as defined in mcpwm_fault_input_level_t.

  2. Initialization of the fault handler by calling either mcpwm_fault_set_oneshot_mode() or mcpwm_fault_set_cyc_mode(). These functions set the mode that MCPWM should operate once fault signal becomes inactive. There are two modes possible:

The function call parameters include selection of one of three fault inputs defined in mcpwm_fault_signal_t and specific action on outputs A and B defined in mcpwm_action_on_pwmxa_t and mcpwm_action_on_pwmxb_t.

Particular fault signal may be disabled at the runtime by calling mcpwm_fault_deinit().

Carrier

The MCPWM has a carrier submodule used if galvanic isolation from the motor driver is required by passing the A/B output signals through transformers. Any of A and B output signals may be at 100% duty and not changing whenever motor is required to run steady at the full load. Coupling of non alternating signals with a transformer is problematic, so the signals are modulated by the carrier submodule to create an AC waveform, to make the coupling possible.

To use the carrier submodule, it should be first initialized by calling mcpwm_carrier_init(). The carrier parameters are defined in mcpwm_carrier_config_t structure invoked within the function call. Then the carrier functionality may be enabled by calling mcpwm_carrier_enable().

The carrier parameters may be then altered at a runtime by calling dedicated functions to change individual fields of the mcpwm_carrier_config_t structure, like mcpwm_carrier_set_period(), mcpwm_carrier_set_duty_cycle(), mcpwm_carrier_output_invert(), etc.

This includes enabling and setting duration of the first pulse of the career with mcpwm_carrier_oneshot_mode_enable(). For more details, see ESP32 Technical Reference Manual > Motor Control PWM (MCPWM) > PWM Carrier Submodule [PDF].

To disable carrier functionality call mcpwm_carrier_disable().

Interrupts

Registering of the MCPWM interrupt handler is possible by calling mcpwm_isr_register(). Note if mcpwm_capture_enable_channel() is used then a default ISR routine will be installed hence please do not call this function to register any more.

Resolution

The default resolution for MCPWM group and MCPWM timer are configured to 10MHz and 1MHz in mcpwm_init(), which might be not enough for some applications. The driver also provides two APIs that can be used to override the default resolution: mcpwm_group_set_resolution() and mcpwm_timer_set_resolution().

Note that, these two APIs won’t update the frequency and duty automatically, to achieve that, one has to call mcpwm_set_frequency() and mcpwm_set_duty() accordingly.

To get PWM pulse that is below 15Hz, please set the resolution to a lower value. For high frequency PWM with limited step range, please set them with higher value.

Application Example

MCPWM example are located under: peripherals/mcpwm:

API Reference

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.

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

Functions

esp_err_t mcpwm_gpio_init(mcpwm_unit_t mcpwm_num, mcpwm_io_signals_t io_signal, int gpio_num)

This function initializes each gpio signal for MCPWM.

备注

This function initializes one gpio at a time.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • io_signal – set MCPWM signals, each MCPWM unit has 6 output(MCPWMXA, MCPWMXB) and 9 input(SYNC_X, FAULT_X, CAP_X) ‘X’ is timer_num(0-2)

  • gpio_num – set this to configure gpio for MCPWM, if you want to use gpio16, gpio_num = 16

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_set_pin(mcpwm_unit_t mcpwm_num, const mcpwm_pin_config_t *mcpwm_pin)

Initialize MCPWM gpio structure.

备注

This function initialize a group of MCPWM GPIOs at a time.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • mcpwm_pin – MCPWM pin structure

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_init(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, const mcpwm_config_t *mcpwm_conf)

Initialize MCPWM parameters.

备注

The default resolution configured for MCPWM group and timer are 160M / 16 = 10M and 10M / 10 = 1M The default resolution can be changed by calling mcpwm_group_set_resolution() and mcpwm_timer_set_resolution(), before calling this function.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers.

  • mcpwm_conf – configure structure mcpwm_config_t

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_group_set_resolution(mcpwm_unit_t mcpwm_num, unsigned long int resolution)

Set resolution of the MCPWM group.

备注

This will override default resolution of group(=10,000,000). This WILL NOT automatically update frequency and duty. Call mcpwm_set_frequency() and mcpwm_set_duty() manually to set them back.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • resolution – set expected frequency resolution

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_timer_set_resolution(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, unsigned long int resolution)

Set resolution of each timer.

备注

This WILL override default resolution of timer(=1,000,000). This WILL NOT automatically update frequency and duty. Call mcpwm_set_frequency() and mcpwm_set_duty() manually to set them back.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • resolution – set expected frequency resolution

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_set_frequency(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, uint32_t frequency)

Set frequency(in Hz) of MCPWM timer.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • frequency – set the frequency in Hz of each timer

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_set_duty(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, mcpwm_generator_t gen, float duty)

Set duty cycle of each operator(MCPWMXA/MCPWMXB)

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • gen – set the generator(MCPWMXA/MCPWMXB), ‘X’ is operator number selected

  • duty – set duty cycle in %(i.e for 62.3% duty cycle, duty = 62.3) of each operator

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_set_duty_in_us(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, mcpwm_generator_t gen, uint32_t duty_in_us)

Set duty cycle of each operator(MCPWMXA/MCPWMXB) in us.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • gen – set the generator(MCPWMXA/MCPWMXB), ‘x’ is operator number selected

  • duty_in_us – set duty value in microseconds of each operator

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_set_duty_type(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, mcpwm_generator_t gen, mcpwm_duty_type_t duty_type)

Set duty either active high or active low(out of phase/inverted)

备注

Call this function every time after mcpwm_set_signal_high or mcpwm_set_signal_low to resume with previously set duty cycle

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • gen – set the generator(MCPWMXA/MCPWMXB), ‘x’ is operator number selected

  • duty_type – set active low or active high duty type

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

uint32_t mcpwm_get_frequency(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num)

Get frequency of timer.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

返回

  • frequency of timer

float mcpwm_get_duty(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, mcpwm_operator_t gen)

Get duty cycle of each operator.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • gen – set the generator(MCPWMXA/MCPWMXB), ‘x’ is operator number selected

返回

  • duty cycle in % of each operator(56.7 means duty is 56.7%)

uint32_t mcpwm_get_duty_in_us(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, mcpwm_operator_t gen)

Get duty cycle of each operator in us.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • gen – set the generator(MCPWMXA/MCPWMXB), ‘x’ is operator number selected

返回

  • duty cycle in us of each operator

esp_err_t mcpwm_set_signal_high(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, mcpwm_generator_t gen)

Use this function to set MCPWM signal high.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • gen – set the operator(MCPWMXA/MCPWMXB), ‘x’ is timer number selected

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_set_signal_low(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, mcpwm_generator_t gen)

Use this function to set MCPWM signal low.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • gen – set the operator(MCPWMXA/MCPWMXB), ‘x’ is timer number selected

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_start(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num)

Start MCPWM signal on timer ‘x’.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_stop(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num)

Start MCPWM signal on timer ‘x’.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_carrier_init(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, const mcpwm_carrier_config_t *carrier_conf)

Initialize carrier configuration.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • carrier_conf – configure structure mcpwm_carrier_config_t

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_carrier_enable(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num)

Enable MCPWM carrier submodule, for respective timer.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_carrier_disable(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num)

Disable MCPWM carrier submodule, for respective timer.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_carrier_set_period(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, uint8_t carrier_period)

Set period of carrier.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • carrier_period – set the carrier period of each timer, carrier period = (carrier_period + 1)*800ns (carrier_period <= 15)

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_carrier_set_duty_cycle(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, uint8_t carrier_duty)

Set duty_cycle of carrier.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • carrier_duty – set duty_cycle of carrier , carrier duty cycle = carrier_duty*12.5% (chop_duty <= 7)

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_carrier_oneshot_mode_enable(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, uint8_t pulse_width)

Enable and set width of first pulse in carrier oneshot mode.

备注

The carrier oneshot pulse can’t disabled.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • pulse_width – set pulse width of first pulse in oneshot mode, width = (carrier period)*(pulse_width +1) (pulse_width <= 15)

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_carrier_output_invert(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, mcpwm_carrier_out_ivt_t carrier_ivt_mode)

Enable or disable carrier output inversion.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • carrier_ivt_mode – enable or disable carrier output inversion

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_deadtime_enable(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, mcpwm_deadtime_type_t dt_mode, uint32_t red, uint32_t fed)

Enable and initialize deadtime for each MCPWM timer.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • dt_mode – set deadtime mode

  • red – set rising edge delay = red*100ns

  • fed – set rising edge delay = fed*100ns

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_deadtime_disable(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num)

Disable deadtime on MCPWM timer.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_fault_init(mcpwm_unit_t mcpwm_num, mcpwm_fault_input_level_t intput_level, mcpwm_fault_signal_t fault_sig)

Initialize fault submodule, currently low level triggering is not supported.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • intput_level – set fault signal level, which will cause fault to occur

  • fault_sig – set the fault pin, which needs to be enabled

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_fault_set_oneshot_mode(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, mcpwm_fault_signal_t fault_sig, mcpwm_output_action_t action_on_pwmxa, mcpwm_output_action_t action_on_pwmxb)

Set oneshot mode on fault detection, once fault occur in oneshot mode reset is required to resume MCPWM signals.

备注

currently low level triggering is not supported

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • fault_sig – set the fault pin, which needs to be enabled for oneshot mode

  • action_on_pwmxa – action to be taken on MCPWMXA when fault occurs, either no change or high or low or toggle

  • action_on_pwmxb – action to be taken on MCPWMXB when fault occurs, either no change or high or low or toggle

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_fault_set_cyc_mode(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, mcpwm_fault_signal_t fault_sig, mcpwm_output_action_t action_on_pwmxa, mcpwm_output_action_t action_on_pwmxb)

Set cycle-by-cycle mode on fault detection, once fault occur in cyc mode MCPWM signal resumes as soon as fault signal becomes inactive.

备注

currently low level triggering is not supported

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • fault_sig – set the fault pin, which needs to be enabled for cyc mode

  • action_on_pwmxa – action to be taken on MCPWMXA when fault occurs, either no change or high or low or toggle

  • action_on_pwmxb – action to be taken on MCPWMXB when fault occurs, either no change or high or low or toggle

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_fault_deinit(mcpwm_unit_t mcpwm_num, mcpwm_fault_signal_t fault_sig)

Disable fault signal.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • fault_sig – fault pin, which needs to be disabled

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_capture_enable_channel(mcpwm_unit_t mcpwm_num, mcpwm_capture_channel_id_t cap_channel, const mcpwm_capture_config_t *cap_conf)

Enable capture channel.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • cap_channel – capture channel, which needs to be enabled

  • cap_conf – capture channel configuration

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_capture_disable_channel(mcpwm_unit_t mcpwm_num, mcpwm_capture_channel_id_t cap_channel)

Disable capture channel.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • cap_channel – capture channel, which needs to be disabled

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

uint32_t mcpwm_capture_signal_get_value(mcpwm_unit_t mcpwm_num, mcpwm_capture_signal_t cap_sig)

Get capture value.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • cap_sig – capture channel on which value is to be measured

返回

Captured value

uint32_t mcpwm_capture_signal_get_edge(mcpwm_unit_t mcpwm_num, mcpwm_capture_signal_t cap_sig)

Get edge of capture signal.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • cap_sig – capture channel of whose edge is to be determined

返回

Capture signal edge: 1 - positive edge, 2 - negtive edge

esp_err_t mcpwm_sync_configure(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, const mcpwm_sync_config_t *sync_conf)

Initialize sync submodule and sets the signal that will cause the timer be loaded with pre-defined value.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • sync_conf – sync configuration on this timer

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_sync_disable(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num)

Disable sync submodule on given timer.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_set_timer_sync_output(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num, mcpwm_timer_sync_trigger_t trigger)

Set sync output on given timer Configures what event triggers MCPWM timer to output a sync signal.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

  • trigger – set the trigger that will cause the timer to generate a software sync signal. Specifically, MCPWM_SWSYNC_SOURCE_DISABLED will disable the timer from generating sync signal.

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Parameter error

esp_err_t mcpwm_timer_trigger_soft_sync(mcpwm_unit_t mcpwm_num, mcpwm_timer_t timer_num)

Trigger a software sync event and sends it to a specific timer.

备注

This software sync event will have the same effect as hw one, except that:

  • On esp32s3 the soft sync event can be routed to its output if MCPWM_SWSYNC_SOURCE_SYNCIN is selected via mcpwm_set_timer_sync_output()

  • On esp32 there is no such behavior and soft sync event will only take effect on this timer and can not be propagated to others.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • timer_num – set timer number(0-2) of MCPWM, each MCPWM unit has 3 timers

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Function pointer error.

esp_err_t mcpwm_sync_invert_gpio_synchro(mcpwm_unit_t mcpwm_num, mcpwm_sync_signal_t sync_sig, bool invert)

Set external GPIO sync input inverter.

参数
  • mcpwm_num – set MCPWM unit(0-1)

  • sync_sig – set sync signal of MCPWM, only supports GPIO sync signal

  • invert – whether GPIO sync source input is inverted (to get negative edge trigger)

返回

  • ESP_OK Success

  • ESP_ERR_INVALID_ARG Function pointer error.

Structures

struct mcpwm_pin_config_t

pin number for MCPWM

Public Members

int mcpwm0a_out_num

MCPWM0A out pin

int mcpwm0b_out_num

MCPWM0A out pin

int mcpwm1a_out_num

MCPWM0A out pin

int mcpwm1b_out_num

MCPWM0A out pin

int mcpwm2a_out_num

MCPWM0A out pin

int mcpwm2b_out_num

MCPWM0A out pin

int mcpwm_sync0_in_num

SYNC0 in pin

int mcpwm_sync1_in_num

SYNC1 in pin

int mcpwm_sync2_in_num

SYNC2 in pin

int mcpwm_fault0_in_num

FAULT0 in pin

int mcpwm_fault1_in_num

FAULT1 in pin

int mcpwm_fault2_in_num

FAULT2 in pin

int mcpwm_cap0_in_num

CAP0 in pin

int mcpwm_cap1_in_num

CAP1 in pin

int mcpwm_cap2_in_num

CAP2 in pin

struct cap_event_data_t

event data that will be passed into ISR callback

Public Members

mcpwm_capture_on_edge_t cap_edge

Which signal edge is detected

uint32_t cap_value

Corresponding timestamp when event occurs. Clock rate = APB(usually 80M)

struct mcpwm_config_t

MCPWM config structure.

Public Members

uint32_t frequency

Set frequency of MCPWM in Hz

float cmpr_a

Set % duty cycle for operator a(MCPWMXA), i.e for 62.3% duty cycle, duty_a = 62.3

float cmpr_b

Set % duty cycle for operator b(MCPWMXB), i.e for 48% duty cycle, duty_b = 48.0

mcpwm_duty_type_t duty_mode

Set type of duty cycle

mcpwm_counter_type_t counter_mode

Set type of MCPWM counter

struct mcpwm_carrier_config_t

MCPWM carrier configuration structure.

Public Members

uint8_t carrier_period

Set carrier period = (carrier_period + 1)*800ns, carrier_period should be < 16

uint8_t carrier_duty

Set carrier duty cycle, carrier_duty should be less than 8 (increment every 12.5%)

uint8_t pulse_width_in_os

Set pulse width of first pulse in one shot mode = (carrier period)*(pulse_width_in_os + 1), should be less then 16

mcpwm_carrier_out_ivt_t carrier_ivt_mode

Invert output of carrier

struct mcpwm_capture_config_t

MCPWM config capture structure.

Public Members

mcpwm_capture_on_edge_t cap_edge

Set capture edge

uint32_t cap_prescale

Prescale of capture signal, ranging from 1 to 256

cap_isr_cb_t capture_cb

User defined capture event callback, running under interrupt context

void *user_data

User defined ISR callback function args

struct mcpwm_sync_config_t

MCPWM config sync structure.

Public Members

mcpwm_sync_signal_t sync_sig

Set sync input signal that will cause timer to sync

uint32_t timer_val

Counter value to be set after sync, in 0 ~ 999, unit: 1 / 1000 * peak

mcpwm_timer_direction_t count_direction

Counting direction to be set after sync

Macros

MCPWM_OPR_A

Deprecated:

MCPWM_OPR_B

Deprecated:

MCPWM_OPR_MAX

Deprecated:

MCPWM_SELCT_SYNC0
MCPWM_SELCT_SYNC1
MCPWM_SELCT_SYNC2
MCPWM_NO_CHANGE_IN_MCPWMXA

Deprecated:

No change in MCPWMXA output

MCPWM_FORCE_MCPWMXA_LOW

Deprecated:

Make MCPWMXA output low

MCPWM_FORCE_MCPWMXA_HIGH

Deprecated:

Make MCPWMXA output high

MCPWM_TOG_MCPWMXA

Deprecated:

Make MCPWMXA output toggle

MCPWM_NO_CHANGE_IN_MCPWMXB

Deprecated:

No change in MCPWMXB output

MCPWM_FORCE_MCPWMXB_LOW

Deprecated:

Make MCPWMXB output low

MCPWM_FORCE_MCPWMXB_HIGH

Deprecated:

Make MCPWMXB output high

MCPWM_TOG_MCPWMXB

Deprecated:

Make MCPWMXB output toggle

Type Definitions

typedef mcpwm_generator_t mcpwm_operator_t

Deprecated:

typedef mcpwm_output_action_t mcpwm_action_on_pwmxa_t

Deprecated:

MCPWM select action to be taken on MCPWMXA when fault occurs

typedef mcpwm_output_action_t mcpwm_action_on_pwmxb_t

Deprecated:

MCPWM select action to be taken on MCPWMXB when fault occurs

typedef mcpwm_capture_signal_t mcpwm_capture_channel_id_t

MCPWM capture channel ID alias.

typedef bool (*cap_isr_cb_t)(mcpwm_unit_t mcpwm, mcpwm_capture_channel_id_t cap_channel, const cap_event_data_t *edata, void *user_data)

Type of capture event callback.

备注

Since this an ISR callback so do not do anything that may block and call APIs that is designed to be used within ISR(usually has ‘_ISR’ postfix)

Param mcpwm

MCPWM unit(0-1)

Param cap_channel

capture channel ID

Param edata

Capture event data, contains capture edge and capture value, fed by the driver

Param user_data

User registered data, passed from mcpwm_capture_config_t

Return

Whether a task switch is needed after the callback function returns, this is usually due to the callback wakes up some high priority task.

Enumerations

enum mcpwm_io_signals_t

IO signals for the MCPWM.

   - 6 MCPWM output pins that generate PWM signals
   - 3 MCPWM fault input pins to detect faults like overcurrent, overvoltage, etc.
   - 3 MCPWM sync input pins to synchronize MCPWM outputs signals
   - 3 MCPWM capture input pins to gather feedback from controlled motors, using e.g. hall sensors

Values:

enumerator MCPWM0A

PWM0A output pin

enumerator MCPWM0B

PWM0B output pin

enumerator MCPWM1A

PWM1A output pin

enumerator MCPWM1B

PWM1B output pin

enumerator MCPWM2A

PWM2A output pin

enumerator MCPWM2B

PWM2B output pin

enumerator MCPWM_SYNC_0

SYNC0 input pin

enumerator MCPWM_SYNC_1

SYNC1 input pin

enumerator MCPWM_SYNC_2

SYNC2 input pin

enumerator MCPWM_FAULT_0

FAULT0 input pin

enumerator MCPWM_FAULT_1

FAULT1 input pin

enumerator MCPWM_FAULT_2

FAULT2 input pin

enumerator MCPWM_CAP_0

CAP0 input pin

enumerator MCPWM_CAP_1

CAP1 input pin

enumerator MCPWM_CAP_2

CAP2 input pin

enum mcpwm_unit_t

Select MCPWM unit.

Values:

enumerator MCPWM_UNIT_0

MCPWM unit0 selected

enumerator MCPWM_UNIT_1

MCPWM unit1 selected

enumerator MCPWM_UNIT_MAX

Max number of MCPWM units

enum mcpwm_timer_t

Select MCPWM timer.

Values:

enumerator MCPWM_TIMER_0

Select MCPWM timer0

enumerator MCPWM_TIMER_1

Select MCPWM timer1

enumerator MCPWM_TIMER_2

Select MCPWM timer2

enumerator MCPWM_TIMER_MAX

Max number of timers in a unit

enum mcpwm_generator_t

Select MCPWM operator.

Values:

enumerator MCPWM_GEN_A

Select MCPWMXA, where ‘X’ is operator number

enumerator MCPWM_GEN_B

Select MCPWMXB, where ‘X’ is operator number

enumerator MCPWM_GEN_MAX

Num of generators to each operator of MCPWM

enum mcpwm_carrier_out_ivt_t

MCPWM carrier output inversion, high frequency carrier signal active with MCPWM signal is high.

Values:

enumerator MCPWM_CARRIER_OUT_IVT_DIS

Enable carrier output inversion

enumerator MCPWM_CARRIER_OUT_IVT_EN

Disable carrier output inversion

enum mcpwm_fault_signal_t

MCPWM select fault signal input.

Values:

enumerator MCPWM_SELECT_F0

Select F0 as input

enumerator MCPWM_SELECT_F1

Select F1 as input

enumerator MCPWM_SELECT_F2

Select F2 as input

enum mcpwm_sync_signal_t

MCPWM select sync signal input.

Values:

enumerator MCPWM_SELECT_NO_INPUT

No sync input selected

enumerator MCPWM_SELECT_TIMER0_SYNC

Select software sync signal from timer0 as input

enumerator MCPWM_SELECT_TIMER1_SYNC

Select software sync signal from timer1 as input

enumerator MCPWM_SELECT_TIMER2_SYNC

Select software sync signal from timer2 as input

enumerator MCPWM_SELECT_GPIO_SYNC0

Select GPIO SYNC0 as input

enumerator MCPWM_SELECT_GPIO_SYNC1

Select GPIO SYNC1 as input

enumerator MCPWM_SELECT_GPIO_SYNC2

Select GPIO SYNC2 as input

enum mcpwm_timer_sync_trigger_t

MCPWM timer sync event trigger.

Values:

enumerator MCPWM_SWSYNC_SOURCE_SYNCIN

the input sync signal will be routed to its sync output path

enumerator MCPWM_SWSYNC_SOURCE_TEZ

sync signal generated when timer counts to zero

enumerator MCPWM_SWSYNC_SOURCE_TEP

sync signal generated when timer counts to peak

enumerator MCPWM_SWSYNC_SOURCE_DISABLED

timer does not generate sync signals

enum mcpwm_fault_input_level_t

MCPWM select triggering level of fault signal.

Values:

enumerator MCPWM_LOW_LEVEL_TGR

Fault condition occurs when fault input signal goes from high to low

enumerator MCPWM_HIGH_LEVEL_TGR

Fault condition occurs when fault input signal goes low to high

enum mcpwm_capture_on_edge_t

MCPWM select capture starts from which edge.

Values:

enumerator MCPWM_NEG_EDGE

Capture the negative edge

enumerator MCPWM_POS_EDGE

Capture the positive edge

enumerator MCPWM_BOTH_EDGE

Capture both edges

enum mcpwm_counter_type_t

Select type of MCPWM counter.

Values:

enumerator MCPWM_FREEZE_COUNTER

Counter freeze

enumerator MCPWM_UP_COUNTER

For asymmetric MCPWM

enumerator MCPWM_DOWN_COUNTER

For asymmetric MCPWM

enumerator MCPWM_UP_DOWN_COUNTER

For symmetric MCPWM, frequency is half of MCPWM frequency set

enumerator MCPWM_COUNTER_MAX

Maximum counter mode

enum mcpwm_duty_type_t

Select type of MCPWM duty cycle mode.

Values:

enumerator MCPWM_DUTY_MODE_0

Active high duty, i.e. duty cycle proportional to high time for asymmetric MCPWM

enumerator MCPWM_DUTY_MODE_1

Active low duty, i.e. duty cycle proportional to low time for asymmetric MCPWM, out of phase(inverted) MCPWM

enumerator MCPWM_HAL_GENERATOR_MODE_FORCE_LOW
enumerator MCPWM_HAL_GENERATOR_MODE_FORCE_HIGH
enumerator MCPWM_DUTY_MODE_MAX

Num of duty cycle modes

enum mcpwm_deadtime_type_t

MCPWM deadtime types, used to generate deadtime, RED refers to rising edge delay and FED refers to falling edge delay.

Values:

enumerator MCPWM_DEADTIME_BYPASS

Bypass the deadtime

enumerator MCPWM_BYPASS_RED

MCPWMXA Out = MCPWMXA In with no delay, MCPWMXB Out = MCPWMXA In with falling edge delay

enumerator MCPWM_BYPASS_FED

MCPWMXA Out = MCPWMXA In with rising edge delay, MCPWMXB Out = MCPWMXB In with no delay

enumerator MCPWM_ACTIVE_HIGH_MODE

MCPWMXA Out = MCPWMXA In with rising edge delay, MCPWMXB Out = MCPWMXA In with falling edge delay

enumerator MCPWM_ACTIVE_LOW_MODE

MCPWMXA Out = MCPWMXA In with compliment of rising edge delay, MCPWMXB Out = MCPWMXA In with compliment of falling edge delay

enumerator MCPWM_ACTIVE_HIGH_COMPLIMENT_MODE

MCPWMXA Out = MCPWMXA In with rising edge delay, MCPWMXB = MCPWMXA In with compliment of falling edge delay

enumerator MCPWM_ACTIVE_LOW_COMPLIMENT_MODE

MCPWMXA Out = MCPWMXA In with compliment of rising edge delay, MCPWMXB Out = MCPWMXA In with falling edge delay

enumerator MCPWM_ACTIVE_RED_FED_FROM_PWMXA

MCPWMXA Out = MCPWMXB Out = MCPWMXA In with rising edge delay as well as falling edge delay

enumerator MCPWM_ACTIVE_RED_FED_FROM_PWMXB

MCPWMXA Out = MCPWMXB Out = MCPWMXB In with rising edge delay as well as falling edge delay

enumerator MCPWM_DEADTIME_TYPE_MAX

Maximum number of supported dead time modes

enum mcpwm_output_action_t

MCPWM select action to be taken on the output when event happens.

Values:

enumerator MCPWM_ACTION_NO_CHANGE

No change in the output

enumerator MCPWM_ACTION_FORCE_LOW

Make output low

enumerator MCPWM_ACTION_FORCE_HIGH

Make output high

enumerator MCPWM_ACTION_TOGGLE

Make output toggle

enum mcpwm_capture_signal_t

MCPWM select capture signal input.

Values:

enumerator MCPWM_SELECT_CAP0

Select CAP0 as input

enumerator MCPWM_SELECT_CAP1

Select CAP1 as input

enumerator MCPWM_SELECT_CAP2

Select CAP2 as input