mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
103 lines
3.6 KiB
C
103 lines
3.6 KiB
C
/* esp_timer (high resolution timer) example
|
|
|
|
This example code is in the Public Domain (or CC0 licensed, at your option.)
|
|
|
|
Unless required by applicable law or agreed to in writing, this
|
|
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
|
CONDITIONS OF ANY KIND, either express or implied.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include "esp_timer.h"
|
|
#include "esp_log.h"
|
|
#include "esp_sleep.h"
|
|
#include "sdkconfig.h"
|
|
|
|
static void periodic_timer_callback(void* arg);
|
|
static void oneshot_timer_callback(void* arg);
|
|
|
|
static const char* TAG = "example";
|
|
|
|
void app_main(void)
|
|
{
|
|
/* Create two timers:
|
|
* 1. a periodic timer which will run every 0.5s, and print a message
|
|
* 2. a one-shot timer which will fire after 5s, and re-start periodic
|
|
* timer with period of 1s.
|
|
*/
|
|
|
|
const esp_timer_create_args_t periodic_timer_args = {
|
|
.callback = &periodic_timer_callback,
|
|
/* name is optional, but may help identify the timer when debugging */
|
|
.name = "periodic"
|
|
};
|
|
|
|
esp_timer_handle_t periodic_timer;
|
|
ESP_ERROR_CHECK(esp_timer_create(&periodic_timer_args, &periodic_timer));
|
|
/* The timer has been created but is not running yet */
|
|
|
|
const esp_timer_create_args_t oneshot_timer_args = {
|
|
.callback = &oneshot_timer_callback,
|
|
/* argument specified here will be passed to timer callback function */
|
|
.arg = (void*) periodic_timer,
|
|
.name = "one-shot"
|
|
};
|
|
esp_timer_handle_t oneshot_timer;
|
|
ESP_ERROR_CHECK(esp_timer_create(&oneshot_timer_args, &oneshot_timer));
|
|
|
|
/* Start the timers */
|
|
ESP_ERROR_CHECK(esp_timer_start_periodic(periodic_timer, 500000));
|
|
ESP_ERROR_CHECK(esp_timer_start_once(oneshot_timer, 5000000));
|
|
ESP_LOGI(TAG, "Started timers, time since boot: %lld us", esp_timer_get_time());
|
|
|
|
/* Print debugging information about timers to console every 2 seconds */
|
|
for (int i = 0; i < 5; ++i) {
|
|
ESP_ERROR_CHECK(esp_timer_dump(stdout));
|
|
usleep(2000000);
|
|
}
|
|
|
|
/* Timekeeping continues in light sleep, and timers are scheduled
|
|
* correctly after light sleep.
|
|
*/
|
|
int64_t t1 = esp_timer_get_time();
|
|
ESP_LOGI(TAG, "Entering light sleep for 0.5s, time since boot: %lld us", t1);
|
|
|
|
ESP_ERROR_CHECK(esp_sleep_enable_timer_wakeup(500000));
|
|
esp_light_sleep_start();
|
|
|
|
int64_t t2 = esp_timer_get_time();
|
|
ESP_LOGI(TAG, "Woke up from light sleep, time since boot: %lld us", t2);
|
|
|
|
assert(abs((t2 - t1) - 500000) < 1000);
|
|
|
|
/* Let the timer run for a little bit more */
|
|
usleep(2000000);
|
|
|
|
/* Clean up and finish the example */
|
|
ESP_ERROR_CHECK(esp_timer_stop(periodic_timer));
|
|
ESP_ERROR_CHECK(esp_timer_delete(periodic_timer));
|
|
ESP_ERROR_CHECK(esp_timer_delete(oneshot_timer));
|
|
ESP_LOGI(TAG, "Stopped and deleted timers");
|
|
}
|
|
|
|
static void periodic_timer_callback(void* arg)
|
|
{
|
|
int64_t time_since_boot = esp_timer_get_time();
|
|
ESP_LOGI(TAG, "Periodic timer called, time since boot: %lld us", time_since_boot);
|
|
}
|
|
|
|
static void oneshot_timer_callback(void* arg)
|
|
{
|
|
int64_t time_since_boot = esp_timer_get_time();
|
|
ESP_LOGI(TAG, "One-shot timer called, time since boot: %lld us", time_since_boot);
|
|
esp_timer_handle_t periodic_timer_handle = (esp_timer_handle_t) arg;
|
|
/* To start the timer which is running, need to stop it first */
|
|
ESP_ERROR_CHECK(esp_timer_stop(periodic_timer_handle));
|
|
ESP_ERROR_CHECK(esp_timer_start_periodic(periodic_timer_handle, 1000000));
|
|
time_since_boot = esp_timer_get_time();
|
|
ESP_LOGI(TAG, "Restarted periodic timer with 1s period, time since boot: %lld us",
|
|
time_since_boot);
|
|
}
|