pwmEx.c

/* Simple PWM example */

/*
* PWMD3 is a HAL defined variable of type PWMDriver - it is associated with
* TIM3.
*/

#include "ch.h"
#include "hal.h"

static PWMConfig pwmcfg = {
  200000, /* 200Khz PWM clock frequency */
  1024, /* PWM period 0.005 second */
  NULL, /* No callback */
  /* Only channel 1 enabled */
  {
    {PWM_OUTPUT_ACTIVE_HIGH, NULL},
    {PWM_OUTPUT_ACTIVE_HIGH, NULL},
    {PWM_OUTPUT_ACTIVE_HIGH, NULL},
    {PWM_OUTPUT_ACTIVE_HIGH, NULL},
  },
  0
};

int main(void) {
  halInit();
  chSysInit();
  uint16_t i = 1;
  /* Enables PWM output (of TIM3, channel 1) on LED connected to PC6 */
  palSetPadMode(GPIOC, 6, PAL_MODE_ALTERNATE(2));
  pwmStart(&PWMD3, &pwmcfg);
  while (TRUE) {
    if (i >= 1024) {
    i = 1;
    } else {
    i *= 2;
    }
  pwmEnableChannel(&PWMD3, 0, i);
  chThdSleepMilliseconds(50);
  }
}