ESP32 定时器和消息队列

简介

本章涉及知识点：ESP32通用定时器、日志输出，FreeRTOS消息队列。

实现功能：使用ESP32通用定时器实现每1S打印输出日志以及每1Min打印输出日志。

ESP-IDF版本：V5.1.2

源码

DesktopScreen 6 Timer&消息队列小智学长的源码：DesktopScreen 6 Timer&消息队列

程序实现

首先，初始化通用定时器，这里注意，在设置警报动作的结构体中要开启重加载功能，否则定时器只能完成1次警报，不能重复。

代码实现如下，主要步骤为：

1.创建定时器

2.注册回调函数

3.定时器使能

4.设置警报动作

5.启动定时器

static void gptimer_init(void)
{//创建定时器gptimer_handle_t gptimer = NULL;gptimer_config_t timer_config = {.clk_src = GPTIMER_CLK_SRC_DEFAULT,.direction = GPTIMER_COUNT_UP,.resolution_hz = 1000000, // 1MHz, 1 tick=1us};ESP_ERROR_CHECK(gptimer_new_timer(&timer_config, &gptimer));//注册回调函数gptimer_event_callbacks_t cbs = {.on_alarm = example_timer_on_alarm_cb_v1,};//指定定时器句柄，要引起的回调函数，要向回调函数传递的值ESP_ERROR_CHECK(gptimer_register_event_callbacks(gptimer, &cbs, timer_queue));//定时器使能ESP_ERROR_CHECK(gptimer_enable(gptimer));//设置警报动作gptimer_alarm_config_t alarm_config1 = {.alarm_count = 10000, // period = 10ms.flags.auto_reload_on_alarm = true, //重加载};ESP_ERROR_CHECK(gptimer_set_alarm_action(gptimer, &alarm_config1));//启动定时器ESP_ERROR_CHECK(gptimer_start(gptimer));
}

定义中断回调事件，通过中断回调函数向timer_queue队列中传值

//中断回调事件
static bool IRAM_ATTR example_timer_on_alarm_cb_v1(gptimer_handle_t timer, const gptimer_alarm_event_data_t *edata, void *user_data)
{BaseType_t high_task_awoken = pdFALSE;//定义结构体事件变量timer_event_t evt={};//向timer_queue队列传参，参数类型为timer_event_t结构体xQueueSendFromISR(timer_queue, &evt, &high_task_awoken);return (high_task_awoken == pdTRUE);
}

定义中断函数处理任务，从队列中接收数据。

static void timer_example_evt_task(void)
{while (1) {timer_event_t evt;xQueueReceive(timer_queue, &evt, portMAX_DELAY);g_timer_event.timer_minute_count ++;//60s 计算一次 刷新时间if(g_timer_event.timer_minute_count >= 6000){g_timer_event.timer_minute_count = 0;ESP_LOGI(TAG,"1Min is run");}g_timer_event.timer_second_count ++;//1s计算一次 if(g_timer_event.timer_second_count >= 100){g_timer_event.timer_second_count = 0;ESP_LOGI(TAG,"1S is run");}}
}

最后，创建任务实现功能。

void ds_timer_init(void)
{g_timer_event.timer_minute_count = 0;   //分钟计数g_timer_event.timer_second_count = 0;   //秒钟计数timer_queue = xQueueCreate(10, sizeof(timer_event_t));  gptimer_init();xTaskCreate(timer_example_evt_task, "timer_evt_task", 2048, NULL, 1, NULL);ESP_LOGI(TAG,"TASK创建成功");
}