#include"reg51.h"
typedef unsigned char u8; //對資料型別進行宣告定義
typedef unsigned int u16;
sbit LSA=P2^2; //74HC138譯碼器數碼管位選
sbit LSB=P2^3;
sbit LSC=P2^4;
#define GPIO_KEY P1
#define GPIO_DIG P0
u16 KeyValue; //用來存放讀取到的鍵值
u16 keyflag,i; //用來判斷按下的數字還是運算子或清空鍵
u8 code smgduan[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x40}; //顯示0~F、負號‘-’
u16 wei[8]={0}; //用來存放每一位數碼管數字的陣列
void delay(u16 i)//延時函式
{
while(i--);
}
void display() //掃描顯示動態數碼管
{
LSA=0; LSB=0; LSC=0; GPIO_DIG=smgduan[wei[7]];delay(50); GPIO_DIG=0x00; //消隱
LSA=1; LSB=0; LSC=0; GPIO_DIG=smgduan[wei[6]];delay(50); GPIO_DIG=0x00;
LSA=0; LSB=1; LSC=0; GPIO_DIG=smgduan[wei[5]];delay(50); GPIO_DIG=0x00;
LSA=1; LSB=1; LSC=0; GPIO_DIG=smgduan[wei[4]];delay(50); GPIO_DIG=0x00;
LSA=0; LSB=0; LSC=1; GPIO_DIG=smgduan[wei[3]];delay(50); GPIO_DIG=0x00;
LSA=1; LSB=0; LSC=1; GPIO_DIG=smgduan[wei[2]];delay(50); GPIO_DIG=0x00;
LSA=0; LSB=1; LSC=1; GPIO_DIG=smgduan[wei[1]];delay(50); GPIO_DIG=0x00;
LSA=1; LSB=1; LSC=1; GPIO_DIG=smgduan[wei[0]];delay(50); GPIO_DIG=0x00;
}
void KeyDown(void)//檢測有按鍵按下并讀取鍵值
{
u16 a=0;
GPIO_KEY=0x0f;
if(GPIO_KEY!=0x0f)//讀取按鍵是否按下
{
delay(1000);//延時10ms進行消抖
if(GPIO_KEY!=0x0f)//再次檢測鍵盤是否按下
{
//測驗列
GPIO_KEY=0x0f;
switch(GPIO_KEY)//行列掃描法
{
case(0X07): KeyValue=https://bbs.csdn.net/topics/0;break;
case(0X0b): KeyValue=https://bbs.csdn.net/topics/1;break;
case(0X0d): KeyValue=https://bbs.csdn.net/topics/2;break;
case(0X0e): KeyValue=https://bbs.csdn.net/topics/3;break;
}
//測驗行
GPIO_KEY=0xf0;
switch(GPIO_KEY)
{
case(0X70): KeyValue=https://bbs.csdn.net/topics/KeyValue;break;
case(0Xb0): KeyValue=https://bbs.csdn.net/topics/KeyValue+4;break;
case(0Xd0): KeyValue=https://bbs.csdn.net/topics/KeyValue+8;break;
case(0Xe0): KeyValue=https://bbs.csdn.net/topics/KeyValue+12;break;
}
if(KeyValue=https://bbs.csdn.net/topics/=0 || KeyValue==1 || KeyValue==2 || KeyValue==3 || KeyValue==4 || Key
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