[应用相关] STM32学习笔记之Systick

/* SysTick end of count event each 1ms with input clock equal to 9MHz (HCLK/8, default) */ 

  SysTick_SetReload(9000);



  /* Enable SysTick interrupt */ 

  SysTick_ITConfig(ENABLE);



  /******************************************************************************* 

* Function Name  : Delay 

* Description    : Inserts a delay time. 

* Input          : nTime: specifies the delay time length, in milliseconds. 

* Output         : None 

* Return         : None 

*******************************************************************************/ 

void Delay(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  : TimingDelay_Decrement 

* Description    : Decrements the TimingDelay variable. 

* Input          : None 

* Output         : TimingDelay 

* Return         : None 

*******************************************************************************/ 

void TimingDelay_Decrement(void) 

{ 

  if (TimingDelay != 0x00) 

  { 

    TimingDelay--; 

  } 

}



stm32f10x_it.c: 

void SysTickHandler(void) 

{ 

TimingDelay_Decrement(); 

}