STM8 learning summary 3: TIM1 timer usage

This article mainly summarizes the meaning of each statement when developing library functions of STM8.

(1) TIM1 initialization configuration function

The main function of the function is to set the parameters and working mode of the counter and enable it;

void Tim1_Init(void)

{

  TIM1_TimeBaseInit(16,TIM1_COUNTERMODE_UP,1000,0);

              //(Timer frequency: 16-division is 1/16 of the system frequency, which is 1M, counting up, timer overflow value, reload count starts from 0)

  TIM1_ITConfig(TIM1_IT_UPDATE, ENABLE); //Interrupt configuration and enable function

  TIM1_ARRPreloadConfig(ENABLE); //Enable the automatic reload function

  TIM1_Cmd(ENABLE); //Start timer

}

About the calculation of timer overflow value: timer overflow value = scheduled timing time (us) * timer frequency

(2) TIM1 interrupt vector function

The main function of the function: call the interrupt execution function and clear the counter flag;

//Interrupt vector function

#pragma vector=0xD

__interrupt void TIM1_UPD_OVF_TRG_BRK_IRQHandler(void)

{

  Tim1_Execut(); //Call interrupt execution function

  TIM1_ClearITPendingBit(TIM1_IT_UPDATE); //Clear update counter flag

}

(3) Interrupt execution function

The main function of the function is to perform timing according to your needs and call related function execution;

Note that the count variable must be declared as a static type, which is related to the life cycle of the count variable;

static u16 i=0;

void Tim1_Execute(void)

{

  i++;

  if(i==1000)

  {

    i=0;

    Led_Revese(); //Function

  }

}

(4) Note that the general interrupt must be enabled in the main function

__enable_interrupt();