/*
 * ext_interrupt.c
 *
 *  Created on: 3 Sep 2019
 *      Author: maximilian
 */

#include "ext_interrupt.h"

void initExtInt(void)
{
	// Initialization structs
	GPIO_InitTypeDef exti_gpio;

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);

    //Additionally we need to initialize corresponding GPIOs
    exti_gpio.GPIO_Pin = GPIO_Pin_8;
    exti_gpio.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    exti_gpio.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOC, &exti_gpio);

	GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource8);

	EXTI_InitTypeDef EXTI_InitStructure;
	EXTI_InitStructure.EXTI_Line = EXTI_Line8;
	EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
	EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
	EXTI_InitStructure.EXTI_LineCmd = ENABLE;
	EXTI_Init(&EXTI_InitStructure);

	NVIC_InitTypeDef NVIC_InitStructure;
	NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn; //Enable keypad external interrupt channel
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F; //Priority 2,
	NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F; //Sub priority 2
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //Enable external interrupt channel
	NVIC_Init(&NVIC_InitStructure);
	osPrintf("Ext. int initialized.");
}

void EXTI9_5_IRQHandler(void)
{
	osPrintf("Got interrupt.");
	if(EXTI_GetITStatus(EXTI_Line8) != RESET) {
		EXTI_ClearITPendingBit(EXTI_Line0);
	}
}