stm8 time1 precise delay-EEWORLD

Collect

// Initialize the millisecond unit

void Timer_Init()

{

TIM1_PSCRH = (unsigned char) ( ( (F_CPU / 1000) - 1) >> 8); /* 16M system clock is pre-divided by f=fck/(PSCR+1) */

TIM1_PSCRL = (unsigned char) ( (F_CPU / 1000) - 1); /* PSCR=0x3E7F, f=16M/(0x3E7F+1)=1000Hz, each counting cycle is 1ms */

TIM1_ARRH = 0; /* I don't know why these three lines need to be initialized first. If they are not used regularly for the first time, they will not work properly*/

TIM1_ARRL = 1; /* */

TIM1_CR1 = 0x01; /* Enable the counter and start counting */

}

/* In ms, the timer is used for more accurate calculation*/

void Delay( unsigned int ticks )

{

TIM1_CR1 = 0x00; /* Counter off */

TIM1_SR1 = 0; /* Clear the update interrupt flag */

TIM1_CNTRH = 0;

TIM1_CNTRL = 0; /* Clear the counter */

TIM1_ARRH = (ticks >> 8); /* Auto-reload register ARR=0x01F4=500 */

TIM1_ARRL = ticks; /* Generate an interrupt every 500 ticks, i.e. 500ms */

TIM1_CR1 = 0x01; /* Enable the counter and start counting */

while ( !(TIM1_SR1 & 0x01) )

;

TIM1_CR1 = 0x00; /* Counter stops counting */

TIM1_SR1 = 0; /* Clear timer 0 flag */

}

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