?? stm32_time.c
字號:
/*******************************************************************************
* Function Name : SysTick_Config
* Description : Configures SysTick
* Input : None
* Output : None
* Return : None
*******************************************************************************/
//SysTick設置
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);
/* Enable the SysTick Interrupt */
SysTick_ITConfig(ENABLE);
}
/*******************************************************************************
* Function Name : Delay_Ms
* Description : Inserts a delay time.
* Input : nTime: specifies the delay time length, in milliseconds.
* Output : None
* Return : None
*******************************************************************************/
void Delay_Ms(u32 nTime)
{
/* Enable the SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Enable);
TimingDelay = nTime;
while(TimingDelay != 0);
/* Disable SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Disable);
/* Clear SysTick Counter */
SysTick_CounterCmd(SysTick_Counter_Clear);
}
/*******************************************************************************
* Function Name : TimingDelayMs_Decrement
* Description : Decrements the TimingDelay variable.
* Input : None
* Output : TimingDelay
* Return : None
*******************************************************************************/
void TimingDelay_Decrement(void)
{
if (TimingDelay != 0x00)
{
TimingDelay--;
}
}
/*******************************************************************************
* Function Name : SysTickHandler
* Description : interrupt.
* Input : None
* Output : TimingDelay
* Return : None
*******************************************************************************/
void SysTickHandler(void)
{
TimingDelay_Decrement();
{
/****一些計數可在此實現,1ms實現一次中斷******/
}
}
使用時通過調用Delay_Ms(nTime)函數來設置精確延時
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