【内核学习营】+王秀峰+rtc_alarm

发布于 2018-09-13 00:33:23 浏览：3622 订阅该版

[tocm]

## 实验要求：

## 准备工作

### - 硬件准备：
正点原子Explore开发板，使用串口2、蜂鸣器、LED

### - 软件准备
stm32f4xx-HAL BSP，env0.7.1、rtt3.1.0、scons

## 示例代码

```c
#include <rtthread.h>
#include <rtdevice.h>
#include <stdlib.h>

#define KEY1 2
#define BEEP 20
#define LED  21

#define BEEP_ON(x)         rt_pin_write(x ,1)
#define BEEP_OFF(x)        rt_pin_write(x ,0)
#define LED_ON(x)         rt_pin_write(x ,0)
#define LED_OFF(x)        rt_pin_write(x ,1)
#define ALARM_NUM_MAX        10

struct rt_alarm *ALARM[ALARM_NUM_MAX];

void alarm_callback_entry(rt_alarm_t alarm, time_t timestamp)
{
        /* 打开蜂鸣器 */
        BEEP_ON(BEEP);
        LED_ON(LED);
        rt_kprintf("Time out!<br>");
}

void alarm_test_entry(void* parameter)
{

rt_uint32_t hour, minute, second;
        while(1)
        {
                if(rt_pin_read(KEY1)==0)
                {
                        BEEP_OFF(BEEP);
                        LED_OFF(LED);
                } 
                get_time(&hour,&minute,&second);
                if((second%5) == 0)
                {
                        rt_kprintf("%d,%d,%d<br>",hour,minute,second);
                }
                rt_thread_delay(20);
        }
}
int alarm_init(void)
{
        rt_thread_t tid;
        /* 初始化按键输入 */
        rt_pin_mode(KEY1, PIN_MODE_INPUT);
        /* 将蜂鸣器控制脚设置为输出模式 */
        rt_pin_mode(BEEP, PIN_MODE_OUTPUT);
        rt_pin_mode(LED, PIN_MODE_OUTPUT);
        /* 蜂鸣器默认不响 */
        BEEP_OFF(BEEP);
        LED_OFF(LED);
        rt_memset(&ALARM, NULL, sizeof(ALARM));
        tid = rt_thread_create("alarm_test",
                                                 alarm_test_entry, 
                                                 RT_NULL,
                                                 512, 
                                                RT_THREAD_PRIORITY_MAX/3, 
                                                 20);
        if (tid != RT_NULL)
                rt_thread_startup(tid);
        set_date(2018,9,12); 
  set_time(21,33,40);
        /* 初始化闹钟服务 */
        rt_alarm_system_init();
        return 0;
}

INIT_APP_EXPORT(alarm_init);

void alarm_add(int argc, char **argv)
{
        struct rt_alarm_setup _alarm;
        if(argc > 1)
        {
                _alarm.flag = RT_ALARM_ONESHOT; /* 单次定时 */
                rt_memset(&_alarm.wktime, RT_ALARM_TM_NOW, sizeof(struct tm));
                _alarm.wktime.tm_hour = atol(argv[1]);
                if(argc > 2)
                {
                        _alarm.wktime.tm_min = atol(argv[2]);
                        _alarm.wktime.tm_sec = 0;
                } 
                if(ALARM[0] == NULL)
                {
                        ALARM[0] = rt_alarm_create(alarm_callback_entry, &_alarm);
                } 
                else
                {
                        rt_alarm_control(ALARM[0], RT_ALARM_CTRL_MODIFY, &_alarm);
                } 
                rt_alarm_start(ALARM[0]);
        }
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(alarm_add, e.g: alarm_add 12 15); /* 12时15分 */
```

## 实验步骤
### 手动添加宏

```c
#define RT_USING_RTC
#define RT_USING_ALARM
```

执行`scons --target=mdk5`重新构建工程

### 设置RTC时间

### 编译下载执行
在msh shell中输入alarm_add 21 34添加闹钟，等待闹钟执行**

## 结果
![1.png](/uploads/201809/13/002958ngc65q2pcpva1pp5.png)

## 遇到的问题及解决方法

实验的过程中alarm成功设置，但是一直没有触发alarm中断，看了一下论坛中挂出来的drv_rtc.c文件，发现跟自己使用的版本不太一样，替换之后成功运行，我这里就不吐槽了。

## 下载附件
- [drv_rtc.c](/uploads/201809/13/003224ybeqfof2a6f5qff9.attach)
- [drv_rtc.h](/uploads/201809/13/003301oi3311ipososlfih.attach)