求助高手:STM32 使用SysTick作为定时器遇到的问题?

Sunrier 提问时间：2011-3-9 13:34 /

SysTick设置
void SysTick_Config(void)
{
/* Disable SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Disable);
/* Disable the SysTick Interrupt */
SysTick_ITConfig(DISABLE);

/* Configure HCLK clock as SysTick clock source */
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
/* SysTick interrupt each 1000 Hz with HCLK equal to 72MHz */
//SysTick_SetReload(9000);
   SysTick_SetReload(72000);
/* Enable the SysTick Interrupt */
SysTick_ITConfig(ENABLE);
}

void SysTickHandler(void)
{
   TimingDelay_Decrement();
}

void TimingDelay_Decrement(void)
{
if (TimingDelay != 0x00)
{
    TimingDelay--;
}
}

void HALMG_IntPro( unsigned char nTime ) //假设传进来的nTime =100;
{
SysTick_CounterCmd(SysTick_Counter_Enable);

    TimingDelay = nTime;
while( TimingDelay )
{
  HALMAG_SPITrackIntProc(); //这个自己定义的函数,可以不管
}

     /* Disable SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Disable); //在程序这设置断点后跟踪发现TimingDelay =100,在while里死循环,没有启用定时器中断,请问哪里出现问题了?

/* Clear SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Clear);


}