#include "stm32f4xx.h"
#include "stm32f4_discovery.h"

int a = 0;
int b = 0;
int c = 0;

void TIM3_IRQHandler(void) {
    if(TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) {
        if(a == 1) {
            GPIO_ToggleBits(GPIOE, GPIO_Pin_8);
            for(int i = 0;i<100000;i++);
        }
        if(b == 1) {
            GPIO_ToggleBits(GPIOE, GPIO_Pin_9);
            for(int i = 0;i<100000;i++);
        }
        if(c == 1) {
            GPIO_ToggleBits(GPIOE, GPIO_Pin_10);
            for(int i = 0;i<100000;i++);
        }

        TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
    }
}

int main(void) {
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); // buttons
    GPIO_InitTypeDef GPIO_BUTTONS;
    GPIO_BUTTONS.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_BUTTONS.GPIO_Mode = GPIO_Mode_IN;
    GPIO_BUTTONS.GPIO_OType = GPIO_OType_PP;
    GPIO_BUTTONS.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_BUTTONS.GPIO_PuPd = GPIO_PuPd_DOWN;
    GPIO_Init(GPIOA, &GPIO_BUTTONS);

    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_TimeBaseStructure.TIM_Period = 9999;
    TIM_TimeBaseStructure.TIM_Prescaler = 2099;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
    TIM_Cmd(TIM3, DISABLE);

    //przerwania tim3
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); // timer 3
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    NVIC_InitTypeDef NVIC_InitStructure3;
    NVIC_InitStructure3.NVIC_IRQChannel = TIM3_IRQn;
    NVIC_InitStructure3.NVIC_IRQChannelPreemptionPriority = 0x00;
    NVIC_InitStructure3.NVIC_IRQChannelSubPriority = 0x00;
    NVIC_InitStructure3.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure3);
    TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
    TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_Init(GPIOE, &GPIO_InitStructure);
    GPIO_SetBits(GPIOE, GPIO_Pin_4);

    GPIO_ResetBits(GPIOE, GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11);

    for(;;) {
        if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_1) == 1 && a == 0) {
            a = 1;
            TIM_Cmd(TIM3, ENABLE);
        }
        if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_1) == 1 && a == 1) {
            a = 0;
            TIM_Cmd(TIM3, DISABLE);
        }
        if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_2) == 1 && b == 0) {
            b = 1;
            TIM_Cmd(TIM3, ENABLE);
        }
        if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_2) == 1 && b == 1) {
            b = 0;
            TIM_Cmd(TIM3, DISABLE);
        }
        if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_3) == 1 && c == 0) {
            c = 1;
            TIM_Cmd(TIM3, ENABLE);
        }
        if(GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_3) == 1 && c == 1) {
            c = 0;
            TIM_Cmd(TIM3, DISABLE);
        }
    }

}