//#pragma SRC
#include <stdio.h>
#include <reg51.h>

#define		TRUE			    1
#define		FALSE			    0
#define		DELAY_VALUE		    3

#define    	PinDrvKey1	P1_0
#define		PinDrvKey2	P1_1
#define		PinDrvKey3	P1_2
#define    	PinDrvKey4	P1_3		//鍵盤掃描的驅動線

#define    	PinScanKey1	P1_4
#define    	PinScanKey2	P1_5
#define    	PinScanKey3	P1_6
#define    	PinScanKey4	P1_7		//鍵盤掃描的信號獲取線

#define		PinLamp		P0_0		//指示燈驅動管腳
#define		PinSpeaker	P0_1		//蜂鳴器驅動管腳

sbit		P0_0=P0^0;
sbit		P0_1=P0^1;
sbit		P0_2=P0^2;
sbit		P0_3=P0^3;
sbit		P0_4=P0^4;
sbit		P0_5=P0^5;
sbit		P0_6=P0^6;
sbit		P0_7=P0^7;

sbit		P1_0=P1^0;
sbit		P1_1=P1^1;
sbit		P1_2=P1^2;
sbit		P1_3=P1^3;
sbit		P1_4=P1^4;
sbit		P1_5=P1^5;
sbit		P1_6=P1^6;
sbit		P1_7=P1^7;

sbit		P2_0=P2^0;
sbit		P2_1=P2^1;
sbit		P2_2=P2^2;
sbit		P2_3=P2^3;
sbit		P2_4=P2^4;
sbit		P2_5=P2^5;
sbit		P2_6=P2^6;
sbit		P2_7=P2^7;


void initial(void);               //初始化子程序
void delay(short i);
unsigned char keyscan(void);

void main(void)
{
	
	unsigned char keyword;
	
	initial();			           //鍵盤驅動信號都設為低
	
	keyword=keyscan();
	
}

void initial(void)
{
	P1_0=FALSE;
	P1_1=FALSE;
	P1_2=FALSE;
	P1_3=FALSE;			      //鍵盤驅動信號都設為低
	P0_0=TRUE;			      //發光二極管設為不亮
	P0_1=TRUE;			      //蜂鳴器不叫
}

unsigned char keyscan()
{
PinDrvKey1=TRUE;
if(PinScanKey1==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE;
if(PinScanKey1==TRUE)
{ 
delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey1==TRUE)			
	return 1;}					    //確認確實有按鍵信號，返回鍵值
if(PinScanKey2==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey2==TRUE)
{ 
delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey2==TRUE)			
	return 5;}					    //確認確實有按鍵信號，返回鍵值
if(PinScanKey3==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey3==TRUE)
{ 
delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey3==TRUE)			
	return 9;}					    //確認確實有按鍵信號，返回鍵值
if(PinScanKey4==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey2==TRUE)
{ 
delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey2==TRUE)
	return 12;}					//確認確實有按鍵信號，返回鍵值
PinDrvKey1=FALSE;				//以上語句掃描第一列
PinDrvKey2=TRUE;
if(PinScanKey1==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey1==TRUE)
{ 
delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey1==TRUE)
	return 2;}					    //確認確實有按鍵信號，返回鍵值
if(PinScanKey2==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey2==TRUE)
{ 
delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey2==TRUE)
	return 6;}					    //確認確實有按鍵信號，返回鍵值
if(PinScanKey3==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey3==TRUE)
{ 
delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey3==TRUE)
	return 0;}					   //確認確實有按鍵信號，返回鍵值
if(PinScanKey4==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey4==TRUE)
{ 
delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey4==TRUE)
	return 13;}					//確認確實有按鍵信號，返回鍵值
PinDrvKey2=FALSE;				//以上語句掃描第二列
PinDrvKey3=TRUE;
if(PinScanKey1==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey1==TRUE)
{
 delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey1==TRUE)
	return 3;}					    //確認確實有按鍵信號，返回鍵值
if(PinScanKey2==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey2==TRUE)
{
 delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey2==TRUE)
	return 7;}					   //確認確實有按鍵信號，返回鍵值
if(PinScanKey3==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey3==TRUE)
{ 
delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey3==TRUE)
	return 10;}					//確認確實有按鍵信號，返回鍵值
if(PinScanKey4==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey4==TRUE)
{
 delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey4==TRUE)
	return 14;}					//確認確實有按鍵信號，返回鍵值
PinDrvKey3=FALSE;				//以上語句掃描第三列
PinDrvKey4=TRUE;
if(PinScanKey4==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey1==TRUE)
{ 
delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey1==TRUE)
	return 4;}					    //確認確實有按鍵信號，返回鍵值
if(PinScanKey2==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey2==TRUE)
{ delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey2==TRUE)
	return 8;}					    //確認確實有按鍵信號，返回鍵值
if(PinScanKey3==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey3==TRUE)
{ 
delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey3==TRUE)
	return 11;}					//確認確實有按鍵信號，返回鍵值
if(PinScanKey4==TRUE)
	PinLamp=FALSE;
	PinSpeaker=FALSE;
	delay(DELAY_VALUE);		//如果判斷有信號，則延時一次
	PinLamp=TRUE;
	PinSpeaker=TRUE; 
if(PinScanKey4==TRUE)
{
 delay(DELAY_VALUE);			//假如判斷還有信號，則再延時
if(PinScanKey4==TRUE)
	return 15;}					//假如判斷還有信號，則再延時
PinDrvKey3=FALSE;				//以上語句掃描第四列
return 16;
}

void delay(short i)
{
	int j=0;
	int k=0;
	k=i*DELAY_VALUE;
	while (j<k)j++;
}