air cochon

#include <stm32f10x.h>
#include "main.h"

void Enable_GPIO(void)
{
        RCC->APB2ENR |= 0x013C;
}

void Init_GPIO(void)
{
        GPIOA->CRL = 0x00030004; // PA4 (Speaker) en Push-Pull et PA0 (Wake Up) en Floating Input
}

void TIM1_UP_IRQHandler(void)
{
        if (TIM1->SR & 1)
      {
                GPIOA->ODR ^= 0x10;
              TIM1->SR &= ~1;
        }
}

int main (void)
{
        int notes[] = {50, 500, 80, 90, 500, 68 };
        int i=0;

        Enable_GPIO();
        Init_GPIO();

        /* Initialisation Timer 1 (TIM1) */

        RCC->APB2ENR |= (1 << 11); // Validation Timer 1
        TIM1->CR1    |= 0x0001; // Timer 1 Enable
        TIM1->DIER   |= 1;
        TIM1->ARR     = 500;
        *(volatile unsigned long *)0xE000E100 |= (1<<25);

        while (1)
        {
                unsigned int cochon = 4000000;
                while (cochon--);

                TIM1->PSC = notes[i++];
                if (i >= sizeof(notes) / 4) i= 0;
        }
}