pwm.c File Reference

Public PWM driver interface for STM32G4. More...

#include <stddef.h>
#include "common/phal_G4/pwm/pwm.h"
#include "common/phal_G4/pwm/pwm_priv.h"

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Functions
bool	PHAL_PWM_init (TIM_TypeDef *tim, uint32_t frequency_hz, uint8_t channels_en)
	Initialize consecutive PWM channels beginning at channel 1.
bool	PHAL_PWM_setPercent (TIM_TypeDef *tim, uint8_t channel, uint8_t percent)
	Set a PWM channel's duty cycle.

Detailed Description

Public PWM driver interface for STM32G4.

Author

Natasha Pandit (npand.nosp@m.it@p.nosp@m.urdue.nosp@m..edu)

Function Documentation

PHAL_PWM_init()

bool PHAL_PWM_init	(	TIM_TypeDef *	tim,
		uint32_t	frequency_hz,
		uint8_t	channels_en )

Initialize consecutive PWM channels beginning at channel 1.

Configures the selected timer to generate PWM at the requested frequency and enables channels 1 through channels_en.

Parameters

tim	Timer peripheral.
frequency_hz	Requested PWM frequency.
channels_en	Channels to enable.

Returns

true if initialized properly; false if tim is NULL, frequency_hz is 0, or initialization fails.

Auto-reload value providing 100 duty-cycle steps.

Number of timer counts in one PWM period.

Divisor needed to produce the requested PWM frequency.

Required timer clock divider.

Prescalar register value corresponding to the clock divider.

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PHAL_PWM_setPercent()

bool PHAL_PWM_setPercent	(	TIM_TypeDef *	tim,
		uint8_t	channel,
		uint8_t	percent )

Set a PWM channel's duty cycle.

Parameters

tim	Timer peripheral.
channel	Specific channel to set duty cycle of.
percent	Duty cycle percentage to set, 0-100.

Returns

true if duty cycle is set properly; false if tim is NULL or setting cycle fails.

Configured timer auto-reload value.

Capture/compare value corresponding to requested duty cycle.

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