main.c

void pwm_task(void *pvParameter) { DPORT_SET_PERI_REG_MASK(DPORT_PERIP_CLK_EN_REG, DPORT_LEDC_CLK_EN); DPORT_CLEAR_PERI_REG_MASK(DPORT_PERIP_RST_EN_REG, DPORT_LEDC_RST);

  // 0 - 8MHz, 1 - 80 MHz
  WRITE_PERI_REG(LEDC_CONF_REG, 1 << LEDC_APB_CLK_SEL_S);

  // High speed
  WRITE_PERI_REG(LEDC_HSTIMER0_CONF_REG, LEDC_TICK_SEL_HSTIMER0 | (0b000000001001010100 << LEDC_DIV_NUM_HSTIMER0_S) | (4 << LEDC_HSTIMER0_LIM_S));

  // Low speed
  WRITE_PERI_REG(LEDC_LSTIMER1_CONF_REG, (1 << LEDC_TICK_SEL_LSTIMER1_S) | (0b000000001001010100 << LEDC_DIV_NUM_LSTIMER1_S) | (4 << LEDC_LSTIMER1_LIM_S));
  WRITE_PERI_REG(LEDC_LSTIMER1_CONF_REG, LEDC_LSTIMER1_RST | LEDC_LSTIMER1_PARA_UP);

  while(1) {
    vTaskDelay(100 / portTICK_PERIOD_MS);

    uint32_t l = READ_PERI_REG(LEDC_LSTIMER1_VALUE_REG);
    uint32_t h = READ_PERI_REG(LEDC_HSTIMER0_VALUE_REG);
    printf("TIMER low=%d high=%d\n", l, h);  // low is always '0'
  }
}