<DAY2>按键中断方式修改参数，并在LCD液晶上显示

实验要求：

1．利用按键对某参数进行修改，可加可减。按键使用中断方式工作；

2. 使用液晶实时显示参数的值，参数的初值为9999；

3. 利用按键可修改参数调整的步长，分别为1、10、100、1000，并在液晶上显示当前步长值。

（本实验所用开发板为STM32F10X系列普中的PZ6806L，采用库函数编程方法）

//主函数代码
#include "system.h"
#include "tftlcd.h"
#include "key.h"
extern u32 buchang;

/*******************************************************************************
* 函 数 名         : main
* 函数功能		   : 主函数
* 输    入         : 无
* 输    出         : 无
*******************************************************************************/
int main()
{
	u8 i=0;
	u16 color=0;
	Key_Init();  //按键初始化
	SysTick_Init(72);
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);  //中断优先级分组 分2组
	TFTLCD_Init();			//LCD初始化
	FRONT_COLOR=BLACK;      //屏幕上显示黑体

	while(1)
	{
		LCD_ShowNum(10,20,num,8,24);//液晶上显示num
		LCD_ShowNum(10,50,buchang,8,24);//液晶上显示buchang
			
	}
}

//key.c代码
#include "key.h"
#include "Systick.h"
#include "system.h"
u32 num=9999,buchang=1;
void Key_Init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	EXTI_InitTypeDef EXTI_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOE|RCC_APB2Periph_AFIO,ENABLE);
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPD;//默认低电平 使用下拉输入
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0;
	GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOA,&GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;
	GPIO_InitStructure.GPIO_Pin=GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4;
	GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
	GPIO_Init(GPIOE,&GPIO_InitStructure);
	
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOA,GPIO_PinSource0);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource2);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource3);
	GPIO_EXTILineConfig(GPIO_PortSourceGPIOE,GPIO_PinSource4);
	
	EXTI_InitStructure.EXTI_Line=EXTI_Line0;
	EXTI_InitStructure.EXTI_LineCmd=ENABLE;
	EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
	EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Rising;//上升沿触发
	EXTI_Init(&EXTI_InitStructure);
	
	EXTI_InitStructure.EXTI_Line=EXTI_Line2|EXTI_Line3|EXTI_Line4;
	EXTI_InitStructure.EXTI_LineCmd=ENABLE;
	EXTI_InitStructure.EXTI_Mode=EXTI_Mode_Interrupt;
	EXTI_InitStructure.EXTI_Trigger=EXTI_Trigger_Falling;//下降沿触发
	EXTI_Init(&EXTI_InitStructure);
	
	NVIC_InitStructure.NVIC_IRQChannel=EXTI0_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
	NVIC_Init(&NVIC_InitStructure);
	
	NVIC_InitStructure.NVIC_IRQChannel=EXTI2_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority=1;
	NVIC_Init(&NVIC_InitStructure);
	
	NVIC_InitStructure.NVIC_IRQChannel=EXTI3_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority=2;
	NVIC_Init(&NVIC_InitStructure);
	
	NVIC_InitStructure.NVIC_IRQChannel=EXTI4_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority=3;
	NVIC_Init(&NVIC_InitStructure);
}

void EXTI0_IRQHandler(void)
{
	if(EXTI_GetFlagStatus(EXTI_Line0)==SET)
	{
		delay_ms(10);
		if(KEY_UP==1)
		{
			num=num+buchang;
		}
		
		EXTI_ClearITPendingBit(EXTI_Line0);
	}
}

void EXTI2_IRQHandler(void)
{
	if(EXTI_GetITStatus(EXTI_Line2)==1)
	{
		delay_ms(10);
		if(K_LEFT==0)
		{
			buchang=buchang*10;
			if(buchang==10000)
			{
				buchang=1;
			}
		}
		
	}
	EXTI_ClearITPendingBit(EXTI_Line2);
}
void EXTI3_IRQHandler(void)
{
	if(EXTI_GetITStatus(EXTI_Line3)==1)
	{
		delay_ms(10);
		if(K_DOWN==0)
		{	
			num=num-buchang;
		}
		
	}
	EXTI_ClearITPendingBit(EXTI_Line3);
}

//key.h代码
#ifndef _key_H
#define _key_H
#include "system.h"
 
#define KEY_LEFT_Pin    GPIO_Pin_2    //定义K_LEFT管脚
#define KEY_DOWN_Pin    GPIO_Pin_3    //定义K_DOWN管脚
#define KEY_RIGHT_Pin   GPIO_Pin_4   //定义K_RIGHT管脚
#define KEY_UP_Pin      GPIO_Pin_0  //定义KEY_UP管脚

#define KEY_Port (GPIOE) //定义端口
#define KEY_UP_Port (GPIOA) //定义端口


//使用位操作定义
#define K_UP PAin(0)
#define K_DOWN PEin(3)
#define K_LEFT PEin(2)
#define K_RIGHT PEin(4)

//使用读取管脚状态库函数定义 
//#define K_UP      GPIO_ReadInputDataBit(KEY_UP_Port,KEY_UP_Pin)
//#define K_DOWN    GPIO_ReadInputDataBit(KEY_Port,KEY_DOWN_Pin)
//#define K_LEFT    GPIO_ReadInputDataBit(KEY_Port,KEY_LEFT_Pin)
//#define K_RIGHT   GPIO_ReadInputDataBit(KEY_Port,KEY_RIGHT_Pin)


//定义各个按键值  
#define KEY_UP 1
#define KEY_DOWN 2
#define KEY_LEFT 3
#define KEY_RIGHT 4  

extern u32 num,l;

void KEY_Init(void);
//u8 KEY_Scan(u8 mode);
#endif

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