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// Source code under CC0 1.0
#include <stdint.h>
#include "stm8.h"
#define PC GPIOC
#define PE GPIOE
volatile unsigned long clk= 0;
void tim1_up_isr(void) __interrupt(TIM1_UP_IRQ)
{
TIM1->sr1&= ~TIM_SR1_UIF;
clk++;
//PE->odr^= 0x80;
}
unsigned long clock(void)
{
unsigned long c;
TIM1->ier&= ~TIM_IER_UIE;
c= clk;
TIM1->ier|= TIM_IER_UIE;
return c;
}
unsigned long last_tick1= 0;
void tick1(unsigned long c)
{
//unsigned long c= clock();
if (c - last_tick1 > 500)
{
last_tick1= c;
PE->odr^= 0x80;
}
}
unsigned long last_tick2= 0;
void tick2(unsigned long c)
{
//unsigned long c= clock();
if (c - last_tick2 > 1000)
{
last_tick2= c;
PC->odr^= 0x80;
}
}
void main(void)
{
CLK->ckdivr = 0x00; // Set the frequency to 16 MHz
CLK->pckenr2 |= 0x02; // Enable clock to timer
// Configure timer
// 16 MHz clock for timer
TIM1->pscrh = 0;//0x3e;
TIM1->pscrl = 0;//0x80;
// Update event at every 1 ms (16000 count)
#define AR 16000
TIM1->arrh = AR >> 8;
TIM1->arrl = AR & 0xff;
// Enable timer
TIM1->cr1 = TIM_CR1_CEN;
// Enable interrupt for timer1 update
TIM1->ier|= TIM_IER_UIE;
EI;
// Configure pins
PE->ddr = 0x80;
PE->cr1 = 0x80;
PC->ddr = 0x80;
PC->cr1 = 0x80;
for(;;)
{
unsigned long c= clock();
tick1(c);
tick2(c);
}
}
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