硬件定时器打开失败求助

发布于 2021-12-10 18:03:45 浏览：1132 订阅该版

加载了一下官网硬件定时器的例程，不清楚是不是哪里配置少了，麻烦大佬们看一下。log打出来是定时器打开失败。
mcu:stm32f205ret6
定时器启用tim3
1.组件已使能
![使能.png](https://oss-club.rt-thread.org/uploads/20211210/99a9fe8bd7a74e2e8f33184e83035630.png)
2.宏定义打开
![宏定义.png](https://oss-club.rt-thread.org/uploads/20211210/0a228afbf2edcc5559144b741fcb4bf6.png)
3.board.h打开tim3
![宏.png](https://oss-club.rt-thread.org/uploads/20211210/43d34d594851b778635dff16428be2c2.png)
4.cubemx配置tim3后 复制了HAL_TIM_Base_MspInit（）到board.c
![cube.png](https://oss-club.rt-thread.org/uploads/20211210/41e510a692e6444023952bde25328c9c.png)
5.官网例程 tim0改为tim3
```
/*
 * 程序清单：这是一个 hwtimer 设备使用例程
 * 例程导出了 hwtimer_sample 命令到控制终端
 * 命令调用格式：hwtimer_sample
 * 程序功能：硬件定时器超时回调函数周期性的打印当前tick值，2次tick值之差换算为时间等同于定时时间值。
*/

#include <rtthread.h>
#include <rtdevice.h>

#define HWTIMER_DEV_NAME   "timer3"     /* 定时器名称 */

/* 定时器超时回调函数 */
static rt_err_t timeout_cb(rt_device_t dev, rt_size_t size)
{
    rt_kprintf("this is hwtimer timeout callback fucntion!\n");
    rt_kprintf("tick is :%d !\n", rt_tick_get());

return 0;
}

static int hwtimer_sample(int argc, char *argv[])
{
    rt_err_t ret = RT_EOK;
    rt_hwtimerval_t timeout_s;      /* 定时器超时值 */
    rt_device_t hw_dev = RT_NULL;   /* 定时器设备句柄 */
    rt_hwtimer_mode_t mode;         /* 定时器模式 */

/* 查找定时器设备 */
    hw_dev = rt_device_find(HWTIMER_DEV_NAME);
    if (hw_dev == RT_NULL)
    {
        rt_kprintf("hwtimer sample run failed! can't find %s device!\n", HWTIMER_DEV_NAME);
        return RT_ERROR;
    }

/* 以读写方式打开设备 */
    ret = rt_device_open(hw_dev, RT_DEVICE_OFLAG_RDWR);
    if (ret != RT_EOK)
    {
        rt_kprintf("open %s device failed!\n", HWTIMER_DEV_NAME);
        return ret;
    }

/* 设置超时回调函数 */
    rt_device_set_rx_indicate(hw_dev, timeout_cb);

/* 设置模式为周期性定时器 */
    mode = HWTIMER_MODE_PERIOD;
    ret = rt_device_control(hw_dev, HWTIMER_CTRL_MODE_SET, &mode);
    if (ret != RT_EOK)
    {
        rt_kprintf("set mode failed! ret is :%d\n", ret);
        return ret;
    }

/* 设置定时器超时值为5s并启动定时器 */
    timeout_s.sec = 5;      /* 秒 */
    timeout_s.usec = 0;     /* 微秒 */

if (rt_device_write(hw_dev, 0, &timeout_s, sizeof(timeout_s)) != sizeof(timeout_s))
    {
        rt_kprintf("set timeout value failed\n");
        return RT_ERROR;
    }

/* 延时3500ms */
    rt_thread_mdelay(3500);

/* 读取定时器当前值 */
    rt_device_read(hw_dev, 0, &timeout_s, sizeof(timeout_s));
    rt_kprintf("Read: Sec = %d, Usec = %d\n", timeout_s.sec, timeout_s.usec);

return ret;
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(hwtimer_sample, hwtimer sample);

```

6.log显示内容
![串口.png](https://oss-club.rt-thread.org/uploads/20211210/bfcea7a11934263bb96d61b8dd8aebf3.png)

![串口.png](https://oss-club.rt-thread.org/uploads/20211210/bfcea7a11934263bb96d61b8dd8aebf3.png)