ESP32定时器例程解析

/*定时器组例子：有两组定时器，每组有两个

*/

#include <stdio.h>

#include "esp_types.h"

#include "freertos/FreeRTOS.h"

#include "freertos/task.h"

#include "freertos/queue.h"

#include "soc/timer_group_struct.h"

#include "driver/periph_ctrl.h"

#include "driver/timer.h"

#define TIMER_DIVIDER    16 // 分频

#define TIMER_SCALE     (TIMER_BASE_CLK / TIMER_DIVIDER) // 转换为秒计数

#define TIMER_INTERVAL0_SEC (3.4179) // 定时器1时间间隔

#define TIMER_INTERVAL1_SEC (5.78) // 定时器2时间间隔

#define TEST_WITHOUT_RELOAD 0    // 不进行重装载

#define TEST_WITH_RELOAD   1    // 进行重装载

/*

 * A sample structure to pass events

 * from the timer interrupt handler to the main program.

 */

typedef struct {

  int type; // the type of timer's event

  int timer_group;

  int timer_idx;

  uint64_t timer_counter_value;

} timer_event_t;

xQueueHandle timer_queue;

/*

 * A simple helper function to print the raw timer counter value

 * and the counter value converted to seconds

 */

static void inline print_timer_counter(uint64_t counter_value)

{

  printf("Counter: 0x%08x%08x\n", (uint32_t) (counter_value >> 32),

                  (uint32_t) (counter_value));

  printf("Time : %.8f s\n", (double) counter_value / TIMER_SCALE);

}

/*