[LV4] Mikroračunalni sustavi - vanjski prekidi

/*================================= VANJSKI PREKIDI =================================*/

/* Includes */
#include <stddef.h>
#include "stm32f10x.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_exti.h"


int main(void) {
    GPIO_InitTypeDef GPIO_InitStruct;
    EXTI_InitTypeDef EXTI_InitStruct;
    NVIC_InitTypeDef NVIC_InitStruct;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); //jer se portovi GPIOA i GPIOB nalaze na busu APB2

    //Konfiguriranje PB0 kao izlazni (crvena ledica)
    GPIO_StructInit(&GPIO_InitStruct);
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz;
    GPIO_WriteBit(GPIOB, GPIO_Pin_0, Bit_SET);
    GPIO_Init(GPIOB, &GPIO_InitStruct);

    //Konfiguriranje PA0 kao ulazni (tipkalo)
    GPIO_StructInit(&GPIO_InitStruct);
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    //Konfiguriranje PA0 za koristenje vanjskog prekida
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
    EXTI_StructInit(&EXTI_InitStruct);
    EXTI_InitStruct.EXTI_Line = EXTI_Line0;
    EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStruct.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStruct);

    //Konfiguriranje NVIC
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //odabir grupe
    NVIC_InitStruct.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 5;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStruct);

    while(1) {

    }
}

//ISR za PB0
void EXTI0_IRQHandler(void) {
    static uint32_t brojac = 0;

    if(brojac%2 == 0) {
        GPIO_WriteBit(GPIOB, GPIO_Pin_0, Bit_RESET);
    }
    else {
        GPIO_WriteBit(GPIOB, GPIO_Pin_0, Bit_SET);
    }
    brojac++;
    EXTI_ClearITPendingBit(EXTI_Line0);
}