HAL库加锁问题

HAL库对外设加锁代码如下：

#define __HAL_LOCK(__HANDLE__)                                           \
                                do{                                        \
                                    if((__HANDLE__)->Lock == HAL_LOCKED)   \
                                    {                                      \
                                       return HAL_BUSY;                    \
                                    }                                      \
                                    else                                   \
                                    {                                      \
                                       (__HANDLE__)->Lock = HAL_LOCKED;    \
                                    }                                      \
                                  }while (0U)

从if到赋值，至少是三条指令。假如在if判断后，出现中断，在这个中断里也会请求使用外设。低级别的请求加锁就失去意义了。

感觉这里不太靠谱。

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我是指用HAL库裸编的情况，用操作系统的加锁就不用提了。