pikapython/port/qemu/demos/software_int/main.c

#define USE_STDPERIPH_DRIVER
#include "stm32_p103.h"

void myDelay(unsigned long delay )
{
    while(delay) delay--;
}

void EXTI0_IRQHandler(void)
{
    /* Make sure the line has a pending interrupt
     * (should this always be true if we are inside this interrupt handle? */

    if(EXTI_GetITStatus(EXTI_Line0) != RESET) {
        /* Toggle LED */
        GPIOC->ODR = GPIOC->ODR ^ 0x00001000;

        /* Clear the pending interrupt flag that triggered this interrupt. */
        EXTI_ClearITPendingBit(EXTI_Line0);
    }
}

int main(void)
{
    init_led();

    init_button();
    enable_button_interrupts();

    while(1) {
          /* Generate a software interrupt on EXTI line 0 */
          EXTI_GenerateSWInterrupt(EXTI_Line0);

          myDelay(500000);
    }
}