freeRTOS基于ESP32

GPIO的PWM

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "driver/ledc.h"

//GPIO和定时器初始化
void Ledc_tim_init(){
    ledc_channel_config_t ledc_config = {
        .gpio_num = 12, /*!< the LEDC output gpio_num, if you want to use gpio16, gpio_num = 16 */
        .speed_mode = LEDC_LOW_SPEED_MODE, /*!< LEDC speed speed_mode, high-speed mode or low-speed mode */
        .channel = LEDC_CHANNEL_0, /*!< LEDC channel (0 - 7) */
        .intr_type = LEDC_INTR_DISABLE, /*!< configure interrupt, Fade interrupt enable or Fade interrupt disable */
        .timer_sel = LEDC_TIMER_0, /*!< Select the timer source of channel (0 - 3) */
        .duty = 0, /*!< LEDC channel duty, the range of duty setting is [0, (2**duty_resolution)] */
        .hpoint = 0, /*!< LEDC channel hpoint value, the max value is 0xfffff */
    };
    ledc_channel_config(&ledc_config);

    const ledc_timer_config_t ledc_timer = {
        .speed_mode = LEDC_LOW_SPEED_MODE, /*!< LEDC speed speed_mode, high-speed mode or low-speed mode */
        .duty_resolution = LEDC_TIMER_8_BIT, /*!< LEDC channel duty resolution */
        .timer_num = LEDC_TIMER_0, /*!< The timer source of channel (0 - 3) */
        .freq_hz = 5000, /*!< LEDC timer frequency (Hz) */
        .clk_cfg = LEDC_AUTO_CLK,
    };
    ledc_timer_config(&ledc_timer);
}

//把上面的函数收进下面的函数,统称初始化

void led_init(){
    Ledc_tim_init();
    ledc_fade_func_install(0);
}

//设置pwm
void user_led_set_duty(uint8_t duty){
    ledc_set_duty(ledc_config.speed_mode,ledc_config.channel,255-duty);
    ledc_update_duty(ledc_config.speed_mode,ledc_config.channel);
}

void key_scan(void *ptr){
    led_init();
    gpio_set_direction(GPIO_NUM_9,GPIO_MODE_INPUT);
    while(1){
        user_led_set_duty(200);
        vTaskDelay(1000/portTICK_PERIOD_MS);
    }
}

void app_main(void){
    xTaskCreate(key_scan,"scan_name",2048,NULL,2,NULL);
}