2019年08月19日 | STM32矩阵键盘4*4扫描程序（无延时消抖，测试稳定）

直接上源码

key.h文件

#ifndef __KEY_H

#define __KEY_H  

#include "sys.h"

#define Read_Lie1 GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_0)

#define Read_Lie2 GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_1)

#define Read_Lie3 GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_2)

#define Read_Lie4 GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_3)

void KEY_Init(void);//IO初始化

u8 KEY_Scan(void);  //按键扫描函数

void Key_Text(void);

#endif

key.c文件

#include "key.h"

#include "sys.h" 

#include "delay.h"

#include "usart.h"

#include "lcd.h"

u8 tem;

//按键初始化函数

void KEY_Init(void) 

{ 

  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC|RCC_AHB1Periph_GPIOE,ENABLE);

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; 

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

  GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;   

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;

GPIO_Init(GPIOE, &GPIO_InitStructure);

}

u8 KEY_Scan(void)//扫描函数

{

static u8 key_flag1=1,key_flag2=1,key_flag3=1,key_flag4=1;     //按键松开标志

u8 KeyVal;

  GPIO_Write(GPIOE,(( GPIOE->ODR & 0xFFC3 )|0x0004)); //0001

if(key_flag1&&(Read_Lie1==1||Read_Lie2==1||Read_Lie3==1||Read_Lie4==1))

{

key_flag1=0;

     if (Read_Lie1==1){ KeyVal= 4; printf("key:%drn",KeyVal);}

else if (Read_Lie2==1) {KeyVal= 8; printf("key:%drn",KeyVal);}

else if (Read_Lie3==1) {KeyVal= 12; printf("key:%drn",KeyVal);}

else if (Read_Lie4==1) {KeyVal= 16; printf("key:%drn",KeyVal);}

}

else if(Read_Lie1==0&&Read_Lie2==0&&Read_Lie3==0&&Read_Lie4==0)key_flag1=1;

else return 0;

GPIO_Write(GPIOE,(( GPIOE->ODR & 0xFFC3 )|0x0008));//0010

if(key_flag2&&(Read_Lie1==1||Read_Lie2==1||Read_Lie3==1||Read_Lie4==1))

{

key_flag2=0;

     if (Read_Lie1==1){ KeyVal= 3; printf("key:%drn",KeyVal);}

else if (Read_Lie2==1) {KeyVal= 7; printf("key:%drn",KeyVal);}

else if (Read_Lie3==1) {KeyVal= 11; printf("key:%drn",KeyVal);}

else if (Read_Lie4==1) {KeyVal= 15; printf("key:%drn",KeyVal);}

}

else if(Read_Lie1==0&&Read_Lie2==0&&Read_Lie3==0&&Read_Lie4==0)key_flag2=1;

else return 0;

GPIO_Write(GPIOE,(( GPIOE->ODR & 0xFFC3 )|0x0010));//0100

if(key_flag3&&(Read_Lie1==1||Read_Lie2==1||Read_Lie3==1||Read_Lie4==1))

{

key_flag3=0;

     if (Read_Lie1==1){ KeyVal= 2; printf("key:%drn",KeyVal);}

else if (Read_Lie2==1) {KeyVal= 6; printf("key:%drn",KeyVal);}

else if (Read_Lie3==1) {KeyVal= 10; printf("key:%drn",KeyVal);}

else if (Read_Lie4==1) {KeyVal= 14; printf("key:%drn",KeyVal);}

}

else if(Read_Lie1==0&&Read_Lie2==0&&Read_Lie3==0&&Read_Lie4==0)key_flag3=1;

else return 0;

GPIO_Write(GPIOE,(( GPIOE->ODR & 0xFFC3 )|0x0020));//1000

   if(key_flag4&&(Read_Lie1==1||Read_Lie2==1||Read_Lie3==1||Read_Lie4==1))

{

key_flag4=0;

     if (Read_Lie1==1){ KeyVal= 1; printf("key:%drn",KeyVal);}

else if (Read_Lie2==1) {KeyVal= 5; printf("key:%drn",KeyVal);}

else if (Read_Lie3==1) {KeyVal= 9; printf("key:%drn",KeyVal);}

else if (Read_Lie4==1) {KeyVal= 13; printf("key:%drn",KeyVal);}

}

else if(Read_Lie1==0 &&Read_Lie2==0 &&Read_Lie3==0 &&Read_Lie4==0 )key_flag4=1;

else return 0;

return KeyVal;

}

void Key_Text(void)

{

switch(tem)

{

case 1:LCD_Clear(WHITE);       break;

case 2:LCD_Clear(BLACK);       break;

case 3:LCD_Clear(BLUE);        break;

case 4:LCD_Clear(RED);         break;

case 5:LCD_Clear(MAGENTA);     break;

case 6:LCD_Clear(GREEN);       break;

case 7:LCD_Clear(CYAN);        break;

case 8:LCD_Clear(YELLOW);      break;

case 9:LCD_Clear(BRRED);       break;

case 10:LCD_Clear(GRAY);       break;

case 11:LCD_Clear(LGRAY);      break;

case 12:LCD_Clear(BROWN);      break;

case 13:LCD_Clear(DARKBLUE);   break;

case 14:LCD_Clear(LIGHTBLUE);  break;

case 15:LCD_Clear(LIGHTGREEN); break;

case 16:LCD_Clear(RED);        break;

}

}