急求一个基于89C51单片机，8255A,用矩阵键盘输入数字，并在LCD1602上显示出来的C语言程序

#include
#include
#define PA                                      XBYTE[0xF8FF]
#define PB                                      XBYTE[0xF9FF]
#define PC                                      XBYTE[0xFAFF]
#define COM                                     XBYTE[0xFBFF]
#define LCD1602_RS_SET()						PB|=1<<0
#define LCD1602_RS_RST()						PB&=~(1<<0)
#define LCD1602_RW_RST()						PB&=~(1<<1)
#define LCD1602_E_SET()							PB|=1<<2
#define LCD1602_E_RST()							PB&=~(1<<2)
static void Delay_ms(unsigned char time)
{
	unsigned char i;
	while(time--)
	{
		for(i=0;i<100;i++);
	}
}
static void LCD1602_WriteByte(unsigned char value,bit dataTypedef)
{
	if(dataTypedef)
	LCD1602_RS_SET();
	else
	LCD1602_RS_RST();
	LCD1602_RW_RST();
	PA = value;
	LCD1602_E_SET();
	Delay_ms(2);
	LCD1602_E_RST();
}
static void LCD1602_Init(void)
{
	LCD1602_WriteByte(0x38,0);
	Delay_ms(10);
	LCD1602_WriteByte(0x01,0);
	Delay_ms(10);
	LCD1602_WriteByte(0x06,0);
	Delay_ms(10);
	LCD1602_WriteByte(0x0C,0);
	Delay_ms(10);
}
static void LCD1602_ShowString(unsigned char address,unsigned char *string)
{
	LCD1602_WriteByte(address,0);
	while(*string)
	{
		LCD1602_WriteByte(*string++,1);
	}
}
static unsigned char bdata KeyStatus=0xFF;
sbit KEY1 = KeyStatus^4;
sbit KEY2 = KeyStatus^5;
sbit KEY3 = KeyStatus^6;
sbit KEY4 = KeyStatus^7;
static unsigned char KeyValue=48;
static void KEY_Testing(void)
{
	PC = 0xFE;
	KeyStatus = PC&0xFF;
	if(KeyStatus!=0xFF)
	{
		if(!KEY1)KeyValue='7';
		if(!KEY2)KeyValue='8';
		if(!KEY3)KeyValue='9';
		if(!KEY4)KeyValue='/';
	}
	PC = 0xFD;
	KeyStatus = PC&0xFF;
	if(KeyStatus!=0xFF)
	{
		if(!KEY1)KeyValue='4';
		if(!KEY2)KeyValue='5';
		if(!KEY3)KeyValue='6';
		if(!KEY4)KeyValue='*';
	}
	PC = 0xFB;
	KeyStatus = PC&0xFF;
	if(KeyStatus!=0xFF)
	{
		if(!KEY1)KeyValue='1';
		if(!KEY2)KeyValue='2';
		if(!KEY3)KeyValue='3';
		if(!KEY4)KeyValue='-';
	}
	PC = 0xF7;
	KeyStatus = PC&0xFF;
	if(KeyStatus!=0xFF)
	{
		if(!KEY1)KeyValue='?';
		if(!KEY2)KeyValue='0';
		if(!KEY3)KeyValue='=';
		if(!KEY4)KeyValue='+';
	}
}
void main()
{	
	COM  = 0x88;
	PA   = 0xFF;
	PB   = 0xFF;
	PC   = 0xFF;
	LCD1602_Init();
	LCD1602_ShowString(0x82,"Hello World!");
	LCD1602_ShowString(0xC0,"Key Pressed--->");
	while(1)
	{
		KEY_Testing();
		LCD1602_WriteByte(0xCF,0);
		LCD1602_WriteByte(KeyValue,1);
	}
}