PWM_GPIO.c File Reference

GPIO PWM emulation handling. More...

#include "sarmfsw.h"
#include "TIM_ex.h"
#include "PWM_GPIO.h"

Include dependency graph for PWM_GPIO.c:

Functions
FctERR	PWM_GPIO_setPin (PWM_GPIO *const pPWM, GPIO_TypeDef *const GPIOx, const uint16_t GPIO_Pin, const bool polarity)
	Set channel pin & polarity for emulated PWM channel.
FctERR	PWM_GPIO_setFreq (PWM_GPIO *const pPWM, TIM_HandleTypeDef *const pTim, const uint16_t freq, uint16_t granularity)
	Set channel frequency for emulated PWM channel.
FctERR	PWM_GPIO_setDuty (PWM_GPIO *const pPWM, const uint16_t val)
	Set new duty cycle for emulated PWM channel.
void	PWM_GPIO_handler (PWM_GPIO *const pPWM)
	Handler for an emulated PWM channel.

Detailed Description

GPIO PWM emulation handling.

Author

SMFSW

Copyright

MIT (c) 2017-2026, SMFSW

PWM_GPIO configuration: TIM with enabled period callback interrupt shall be used (as time base for PWM emulation)

Function Documentation

PWM_GPIO_handler()

void PWM_GPIO_handler

(

PWM_GPIO *const

pPWM

)

Handler for an emulated PWM channel.

Warning

Shall be called directly from timer interrupt (HAL_TIM_PeriodElapsedCallback)

Parameters

[in,out]

pPWM

- pointer to emulated PWM channel

PWM_GPIO_setDuty()

FctERR PWM_GPIO_setDuty	(	PWM_GPIO *const	pPWM,
		const uint16_t	val )

Set new duty cycle for emulated PWM channel.

Parameters

[in,out]	pPWM	- pointer to emulated PWM channel
[in]	val	- Duty cycle to apply

Returns

Error code

PWM_GPIO_setFreq()

FctERR PWM_GPIO_setFreq	(	PWM_GPIO *const	pPWM,
		TIM_HandleTypeDef *const	pTim,
		const uint16_t	freq,
		uint16_t	granularity )

Set channel frequency for emulated PWM channel.

Warning

For multiple PWMs on same timer with different frequencies, take care of init order (first configured channel will get TIM parameters precedence)

Parameters

[in,out]	pPWM	- pointer to emulated PWM channel
[in,out]	pTim	- pointer to TIM instance for Frequency computation
[in]	freq	- PWM frequency to apply
[in]	granularity	- PWM duty cycle granularity

Returns

Error code

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PWM_GPIO_setPin()

FctERR PWM_GPIO_setPin	(	PWM_GPIO *const	pPWM,
		GPIO_TypeDef *const	GPIOx,
		const uint16_t	GPIO_Pin,
		const bool	polarity )

Set channel pin & polarity for emulated PWM channel.

Parameters

[in]	GPIOx	- port for emulated PWM
[in]	GPIO_Pin	- pin for emulated PWM
[in,out]	pPWM	- pointer to emulated PWM channel
[in]	polarity	- 0: low polarity, 1: high polarity

Returns

Error code