ESP32 General Purpose Timer

#include <stdio.h>

#include "freertos/FreeRTOS.h"

#include "freertos/task.h"

#include "freertos/queue.h"

#include "driver/timer.h"

#define TIMER_DIVIDER         (16)

#define TIMER_SCALE           (TIMER_BASE_CLK / TIMER_DIVIDER)

uint64_t counter_value;

static void app_timer_init(int group, int timer, bool auto_reload, int timer_interval_sec)

{

    timer_config_t config = {

        .divider = TIMER_DIVIDER,

        .counter_dir = TIMER_COUNT_UP,

        .counter_en = TIMER_PAUSE,

        .alarm_en = TIMER_ALARM_EN,

        .auto_reload = auto_reload,

    };

    timer_init(group, timer, &config);

    timer_set_alarm_value(group, timer, timer_interval_sec * TIMER_SCALE);

  timer_start(group, timer);

}

void show_timer_task() 

{

    while(1) {

    timer_get_counter_value(TIMER_GROUP_0, TIMER_0, &counter_value);

    printf("%.0f\n", (float) counter_value / TIMER_SCALE);

    vTaskDelay(1000 / portTICK_PERIOD_MS);

    }

}

void app_main(void) 

{

  app_timer_init(TIMER_GROUP_0, TIMER_0, true, 10);

    xTaskCreatePinnedToCore( show_timer_task, "show_timer_task", 2048, NULL, 1, NULL, 1 );