本帖最后由 Sweet 于 2016-5-9 16:36 编辑
最近调试了一个程序,使用的是keil5中Manage Run-Time Environment搭建的库。但是里面的延时函数就是个bug。函数原型与定义如下:
void HAL_Delay(__IO uint32_t Delay);
/**
* @brief This function provides accurate delay (in milliseconds) based
* on variable incremented.
* @note In the default implementation , SysTick timer is the source of time base.
* It is used to generate interrupts at regular time intervals where uwTick
* is incremented.
* @note This function is declared as __weak to be overwritten in case of other
* implementations in user file.
* @param Delay: specifies the delay time length, in milliseconds.
* @retval None
*/
__weak void HAL_Delay(__IO uint32_t Delay)
{
uint32_t tickstart = 0;
tickstart = HAL_GetTick();
while((HAL_GetTick() - tickstart) < Delay)
{
}
}
/**
* @brief Provides a tick value in millisecond.
* @note This function is declared as __weak to be overwritten in case of other
* implementations in user file.
* @retval tick value
*/
__weak uint32_t HAL_GetTick(void)
{
return uwTick;
}
一调用HAL_Delay,CPU就会死机。我在原子的库中重新定义了HAL_Delay,依然死机。但是keil自带的库上面依然有很多函数在调用这个函数。比如SPI,I2C等。这就意味着如果这个问题不解决,那么keil本身的很多外设的驱动就不能直接调用,还要从底层重新写。所以我想解决这个问题。求指教。
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