#include "stm32f4xx_conf.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_tim.h"
#include "stm32f4xx_usart.h"
#include "misc.h"

uint16_t lewa, znak, prawa, wynik;
unsigned int n = 0;

int main(void)
{
	SystemInit();

	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);

	GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOC, &GPIO_InitStructure);
	GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3);
	GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_USART3);

	//GPIO_InitTypeDef GPIO_InitStructure;
	GPIO_InitStructure.GPIO_Pin =
	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_Speed = GPIO_Speed_100MHz;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
	GPIO_Init(GPIOD, &GPIO_InitStructure);

	TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
	TIM_TimeBaseStructure.TIM_Period = 9999;
	TIM_TimeBaseStructure.TIM_Prescaler = 8399;
	TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
	TIM_TimeBaseStructure.TIM_CounterMode =  TIM_CounterMode_Up;
	TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

	USART_InitTypeDef USART_InitStructure;
	USART_InitStructure.USART_BaudRate = 115200;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
	USART_Init(USART3, &USART_InitStructure);

	NVIC_InitTypeDef NVIC_InitStructure;
	NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);

	NVIC_InitTypeDef NVIC_InitStructure2;
	USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
	NVIC_InitStructure2.NVIC_IRQChannel = USART3_IRQn;
	NVIC_InitStructure2.NVIC_IRQChannelPreemptionPriority = 0x01;
	NVIC_InitStructure2.NVIC_IRQChannelSubPriority = 0x01;
	NVIC_InitStructure2.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure2);
	NVIC_EnableIRQ(USART3_IRQn);

	TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
	TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);

	TIM_Cmd(TIM3, ENABLE);
	USART_Cmd(USART3, ENABLE);

	void TIM3_IRQHandler(void);
	void USART3_IRQHandler(void);

	while(1){}
}

void TIM3_IRQHandler(void)
{
     if(TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
     {
    	 //zad1
//		USART_SendData(USART3, 'A');

   	TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
     }
}

void USART3_IRQHandler(void)
{
    if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
    {
    	//zad2
    	//USART3->DR -= 32;

    	//zad3
    	//if(USART3->DR == 'a')
    	//	GPIO_ToggleBits(GPIOD, GPIO_Pin_12);
    	//if(USART3->DR == 's')
    	//    GPIO_ToggleBits(GPIOD, GPIO_Pin_13);
    	//if(USART3->DR == 'd')
    	//    GPIO_ToggleBits(GPIOD, GPIO_Pin_14);
    	//if(USART3->DR == 'f')
    	//    GPIO_ToggleBits(GPIOD, GPIO_Pin_15);

    	switch (n%3)
    	{
    		case 0:
    	    	lewa = USART3->DR;
    	    	n++;
    	    	break;
    	   	case 1:
    	   	   	znak = USART3->DR;
    	   	    n++;
    	   	    break;
    	   	case 2:
    	   		prawa = USART3->DR;
    	   		USART_SendData(USART3, '=');
    	   		while (USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET);
    	   		if (znak == '+') wynik = (lewa-48)+(prawa-48);
    	   		if (znak == '-') wynik = (lewa-48)-(prawa-48);
    	   		if (znak == '*') wynik = (lewa-48)*(prawa-48);
    	   		if (wynik/10 > 0)
    	   		{
    	   			USART_SendData(USART3, (wynik/10)+48);
    	   			while (USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET);
    	   			USART_SendData(USART3, (wynik%10)+48);
    	   			while (USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET);
    	   		}else{
    	   			USART_SendData(USART3, wynik+48);
    	   			while (USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET);
    	   		}
    	   		USART_SendData(USART3, 10);
    	   	//	while (USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET);
    	   		n++;
    	   		break;
    	}
    }
}