Hi
I've just started using STM8 microcontrollers, specifically the STM8S003F3P6
chip, in my own custom test board. The board works and I am able to blink an
LED on PA3 without using an interrupt.However, when I try to make the blink
take place in the Tim2_OVF interrupt, nothing happens. I think the interrupt is
not taking place. What have I missed??
I saw this on the mailing list. My code includes the "rim" instruction.
https://sourceforge.net/p/sdcc/mailman/message/35618801/
My complete code is below. It blinks the led 5 times before the timer TIM2 is
started. My SDCC version is 3.9.0Your help is appreciated.
#include <stdint.h>#include <stm8s.h>
#define F_CPU 2000000UL#define LED_PIN 3
void delay_ms(uint16_t ms);
char tix, i,j,six, mins, b_chgLED;
void mS125_isr() __interrupt(TIM2_OVF_ISR) { tix++; if(tix==8) { six++; tix=0;
} if(six==60) { mins++; six=0; } if(tix==0 || tix==4) { PA_ODR ^= (1 <<
LED_PIN); } TIM2_SR1 &= ~(1 << TIM2_SR1_UIF);
}//----------------------------------------------------------------------------
//Main routine startsvoid main() { PA_DDR |= (1 << LED_PIN); // configure
PA3 as output PA_CR1 |= (1 << LED_PIN); // push-pull mode
/* Prescaler = 128 */ TIM2_PSCR = 0b00000111;
/* Frequency = F_CLK / (2 * prescaler * (1 + ARR)) * = 2 MHz
/ (2 * 128 * (1 + 1952)) = 8 Hz */ TIM2_ARRH = 0x07; TIM2_ARRL = 0xa1;
for(i=0;i<10;i++) { /* toggle pin initially with a delay */
PA_ODR ^= (1 << LED_PIN); delay_ms(125); }
__asm__("rim\n");
TIM2_IER |= (1 << TIM2_IER_UIE); // Enable Update Interrupt TIM2_CR1 |=
(1 << TIM2_CR1_CEN); // Enable TIM2
while
(1){};}//---------------------------------------------------------------------------void
delay_ms(uint16_t ms) { long li; for (li = 0; li < ((F_CPU / 18000UL) *
ms); li++) __asm__("nop\n");}
Thanks and Warm Regards
Shiv_______________________________________________
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