5 看门狗不能关闭，STOP控制字没有实现

发布于 2021-08-18 20:08:01 浏览：1262 订阅该版

RTT看门狗驱动里面不支持停止吗，control里面没有STOP的相关控制字
```c
static rt_err_t wdt_control(rt_watchdog_t *wdt, int cmd, void *arg)
{
    switch (cmd)
    {
        /* feed the watchdog */
    case RT_DEVICE_CTRL_WDT_KEEPALIVE:
        if(HAL_IWDG_Refresh(&stm32_wdt.hiwdg) != HAL_OK)
        {
            LOG_E("watch dog keepalive fail.");
        }
        break;
        /* set watchdog timeout */
    case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
#if defined(LSI_VALUE)
        if(LSI_VALUE)
        {
            stm32_wdt.hiwdg.Init.Reload = (*((rt_uint32_t*)arg)) * LSI_VALUE / 256 ;
        }
        else
        {
            LOG_E("Please define the value of LSI_VALUE!");
        }
        if(stm32_wdt.hiwdg.Init.Reload > 0xFFF)
        {
            LOG_E("wdg set timeout parameter too large, please less than %ds",0xFFF * 256 / LSI_VALUE);
            return -RT_EINVAL;
        }
#else
  #error "Please define the value of LSI_VALUE!"
#endif
        if(stm32_wdt.is_start)
        {
            if (HAL_IWDG_Init(&stm32_wdt.hiwdg) != HAL_OK)
            {
                LOG_E("wdg set timeout failed.");
                return -RT_ERROR;
            }
        }
        break;
    case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
#if defined(LSI_VALUE)
        if(LSI_VALUE)
        {
            (*((rt_uint32_t*)arg)) = stm32_wdt.hiwdg.Init.Reload * 256 / LSI_VALUE;
        }
        else
        {
            LOG_E("Please define the value of LSI_VALUE!");
        }
#else
  #error "Please define the value of LSI_VALUE!"
#endif
        break;
    case RT_DEVICE_CTRL_WDT_START:
        if (HAL_IWDG_Init(&stm32_wdt.hiwdg) != HAL_OK)
        {
            LOG_E("wdt start failed.");
            return -RT_ERROR;
        }
        stm32_wdt.is_start = 1;
        break;
    default:
        LOG_W("This command is not supported.");
        return -RT_ERROR;
    }
    return RT_EOK;
}
```
而且看门狗的rt_watchdog_stop也没用，底层还是调用的control函数
```c
static rt_err_t rt_watchdog_close(struct rt_device *dev)
{
    rt_watchdog_t *wtd;

RT_ASSERT(dev != RT_NULL);
    wtd = (rt_watchdog_t *)dev;

if (wtd->ops->control(wtd, RT_DEVICE_CTRL_WDT_STOP, RT_NULL) != RT_EOK)
    {
        rt_kprintf(" This watchdog can not be stoped\n");

return (-RT_ERROR);
    }

return (RT_EOK);
}
```
请教各位大佬。