/****************************************************************************
*   Copyright: (C)2018 Î人ÁèÔÆÎïÍøÖÇ¿ÆʵÑéÊÒ www.iot-yun.com
*      Author: GuoWenxue<guowenxue@gmail.com> QQ: 281143292
* Description: STM32L151C8T6 CubeMX ¿ª·¢°åÖ»ÓÐÒ»¸ö°´¼ü°´Å¥Á¬µ½PA0,ÁíÍâÒ»¸öÊǸ´Î»°´¼ü¡£
* 
*   ChangeLog:
*        °æ±¾ºÅ     ÈÕÆÚ       ×÷Õß      ˵Ã÷
*        V1.0.0  2018.11.05  GuoWenxue   ·¢²¼¸Ã°æ±¾
****************************************************************************/
#include <stdio.h>
#include "stm32l1xx.h"

void init_key1_gpio_interrupt(void);

/* º¯Êý˵Ã÷:  ÅäÖÃËùÓеİ´¼üµÄ GPIO¿Ú¡¢Ê±ÖÓºÍÖÐ¶Ï  */
void init_keys_interrupt(void)
{
	/* STM32L151C8T6 CubeMX ¿ª·¢°åÖ»ÓÐÒ»¸ö°´¼ü°´Å¥Á¬µ½PA0ÉÏ */
	init_key1_gpio_interrupt();
}


void init_key1_gpio_interrupt(void) 
{ 
	GPIO_InitTypeDef      GPIO_InitStructure; 
	NVIC_InitTypeDef      NVIC_InitStructure;
	EXTI_InitTypeDef      EXTI_InitStructure;
	
	/* ʹÄÜGPIOAµÄʱÖÓ */
	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

	/* ³õʼ»¯ÖжÏÓÅÏȼ¶ */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

	/* °´¼üÉ϶Ëͨ¹ýÉÏÀ­µç×èÁ¬µ½VCCÉÏ, ËùÒÔÉèÖÃÖжÏΪÉÏÉýÑØ´¥·¢ */
	EXTI_DeInit();
  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; 
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure); 
	
	/* ĬÈϽ«GPIO¿ÚÅäÖóÉÏÂÀ­µÍµçƽģʽ, ÕâÑùµ±°´¼ü°´Ïº󽫻á±ä³ÉVCC²úÉúÉÏÉýÑØ */
	GPIO_InitStructure.GPIO_Speed  = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_Pin    = GPIO_Pin_0;  
	GPIO_InitStructure.GPIO_Mode   = GPIO_Mode_IN; 
  GPIO_InitStructure.GPIO_OType  = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd   = GPIO_PuPd_DOWN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);	
} 


/* Ïû³ý°´¼ü¶¶¶¯ÑÓʱº¯Êý */
static __inline void key_dejitter_delay(void)
{
	uint32_t       times=6000;  
	while( times--) ;
}


/* µ±°´¼ü°´ÏÂʱ»á²úÉúÖжϣ¬CPUÌøתµ½startup_stm32l1xx_md.sÖвéѯÖжÏÏòÁ¿±í,²¢µ÷ÓÃÏàÓ¦µÄÖжϷþÎñ´¦Àí³EXTI0_IRQHandler() */
void EXTI0_IRQHandler(void)
{
	if(EXTI_GetITStatus(EXTI_Line0) != RESET)
	{
		/* È¥¶¶£º ÑÓʱһ¶Îʱ¼ä²é¿´GPIOµÄ״̬£¬Èç¹û»¹Êǵ͵çƽ˵Ã÷ÊÇÓÐЧ°´¼ü */
		key_dejitter_delay();
		if( Bit_SET == GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) )
		{
			printf("Detect Key Pressed and turn LED ON/off.\n");
			GPIO_WriteBit(GPIOB, GPIO_Pin_1, (BitAction)((1-GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_1))));
			EXTI_ClearITPendingBit(EXTI_Line0);
		}			
	}
}