关于STM32的休眠与Systick如何共用的问题，跪求大侠帮忙？？

lyphuy 提问时间：2013-9-18 11:01 /

在做休眠时，采用的是RTC Alarm方式唤醒MCU，但是系统又同时使用了Systick作为时钟基准计数器。
如何避免休眠时被Systick唤醒，但是同时可以让Systick正常运转计数。
求帮忙，谢谢？
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* 2 bits for Preemption Priority and 2 bits for Sub Priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStructure.NVIC_IRQChannel = RTCAlarm_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
//系统滴答计数器
void SysTick_Configuration(void)
{
/* Setup SysTick Timer for 1 msec interrupts */
if (SysTick_Config(SystemFrequency / 1000))
{
/* Capture error */
while (1);
}
/* Set SysTick Priority to 3 */
NVIC_SetPriority(SysTick_IRQn, 0x0C);
}

main函数主循环如下
while (1)
{
/* Insert 1.5 second delay */
Delay(1500);
/* Wait till RTC Second event occurs */
RTC_ClearFlag(RTC_FLAG_SEC);
while(RTC_GetFlagStatus(RTC_FLAG_SEC) == RESET);
/* Alarm in 3 second */
RTC_SetAlarm(RTC_GetCounter()+ 3);
/* Wait until last write operation on RTC registers has finished */
RTC_WaitForLastTask();
/* Turn off led connected to GPIO_LED Pin9 */
LED_OFF(GPIO_Pin_10);
/* Request to enter STOP mode with regulator in low power mode*/
PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);
/* At this stage the system has resumed from STOP mode -------------------*/
/* Configures system clock after wake-up from STOP: enable HSE, PLL and select
PLL as system clock source (HSE and PLL are disabled in STOP mode) */
SYSCLKConfig_STOP();
}
//延时函数

void Delay(__IO uint32_t nTime)
{
TimingDelay = nTime;
while(TimingDelay != 0){};
}
//中断响应

void SysTick_Handler(void)
{
TimingDelay--;
}