2.c

遥控器使用红外线遥控编码芯片为LC7461 单片机为89S52 12MHZ晶振 1602显示遥控器的每个键值

//遥控器使用红外线遥控编码芯片为LC7461   12MHZ晶振
//-----------------------------------------------
#include <regx52.h>
#include<intrins.h>

sbit RS = P2^0;
sbit RW = P2^1;
sbit Elcm =P2^2;
#define DATAPORT P0 // 数据端口
#define busy 0x80 //用于检查写忙信号

sbit p32=P3^2;
sbit p37=P3^7;
unsigned char flag;  //引导码标志位
unsigned char REM_l;
unsigned char REM_h;
unsigned char a,b;
                

void delay400ms(void);
void delay5ms(void);
void lcdreset( void ); //LCD RESET
void WaitForEnable( void ); //忙信号检测
void lcdwrite_c( unsigned char CMD,unsigned char AttribC );//
void DispOneChar(unsigned char x,unsigned char y,unsigned char Wdata);//显示一个字符
void LocateXY( unsigned char posx,unsigned char posy);
void LcdWrite_D( unsigned char dataW ) ; //写一个数据
void disp(unsigned char x,unsigned char y,char *ptr);

/**************精确延时程序***************/
void delay_880us(void) //延时880us
{
	unsigned int i;
	for(i=0;i<109;i++);
}
 
void delay_4720us(void) //延时4.7ms
{
	unsigned int k;
	for(k=0;k<892;k++);
}
 
void delay_1ms(void) //延时1ms
{
	unsigned int m;
	for(m=0;m<124;m++);
}                   


// 短延时
void delay5ms(void)
{
unsigned int i = 5552;
while(i--);
}
//长延时
void delay400ms(void)
{
unsigned char i = 5;
unsigned int j;
while(i--)
{
j=7269;
while(j--);
};
}


/*=======================================================
显示字符串
=======================================================*/
void disp(unsigned char x,unsigned char y,char *ptr) {
unsigned char i,l=0;
while (ptr[l] >31){l++;};
for (i=0;i<l;i++) {
DispOneChar(x++,y,ptr[i]);
if ( x == 16 ){
x = 0; y ^= 1;
}
}
}
/*=======================================================
按指定位置显示数出一个字符
=======================================================*/
void DispOneChar(unsigned char x,unsigned char y,unsigned char Wdata) {
LocateXY( x, y ); // 定位显示地址
LcdWrite_D( Wdata ); // 写字符
}
/*=======================================================
显示光标定位
=======================================================*/
void LocateXY( unsigned char posx,unsigned char posy) {
unsigned char temp;
temp = posx & 0xf;
posy &= 0x1;
if ( posy )temp |= 0x40;
temp |= 0x80;
lcdwrite_c(temp,0);
}
//初始化
void lcdreset(void){
lcdwrite_c(0x38, 0); //显示模式设置（不测试忙信号）共三次
delay5ms();
lcdwrite_c(0x38, 0);
delay5ms();
lcdwrite_c(0x38, 0);
delay5ms();
lcdwrite_c( 0x38, 1);
lcdwrite_c( 0x08, 1);
lcdwrite_c( 0x01, 1);
lcdwrite_c( 0x06, 1);
lcdwrite_c( 0x0c, 1);
}

/*=======================================================
写控制字符子程序: E=1 RS=0 RW=0
=======================================================*/
void lcdwrite_c( unsigned char CMD,unsigned char AttribC ) {
if (AttribC) WaitForEnable(); // 检测忙信号?
RS = 0; RW = 0; _nop_();
DATAPORT =CMD; _nop_(); // 送控制字子程序
Elcm = 1;_nop_();_nop_();Elcm = 0; // 操作允许脉冲信号 
}
/*=======================================================*/
/*=======================================================
当前位置写字符子程序: E =1 RS=1 RW=0
=======================================================*/
void LcdWrite_D( unsigned char dataW ) {
WaitForEnable(); // 检测忙信号
RS = 1; RW = 0; _nop_();
DATAPORT = dataW; _nop_();
Elcm = 1; _nop_(); _nop_(); Elcm = 0; // 操作允许脉冲信号 
}
/*=======================================================
正常读写操作之前必须检测LCD控制器状态: CS=1 RS=0 RW=1
DB7: 0 LCD控制器空闲; 1 LCD控制器忙
========================================================*/
void WaitForEnable( void ) {
DATAPORT = 0xff;
RS =0; RW = 1; _nop_(); Elcm = 1; _nop_(); _nop_();
while( DATAPORT & busy );
Elcm = 0;
} 
                   

/*************中断服务程序***********/
void intt0(void) interrupt 0 using 0
{
	unsigned char i,k,n,temp;
	EA=0;
	/****以下跳过系统引导码****/
	for(i=0;i<10;i++)
	{
		delay_880us();//延时882微秒后判断P3.2脚是否出现高电平如果有就退出解码程序
		if(p32==1)
		{
			flag=1;
			break;
		}// 重复10次，目的是检测在8820微秒内如果出现高电平就退出解码程序
		else
			flag=0;
	}
	
	if(flag==0)
	{ //
		while(p32==0);//等待高电平避开9毫秒低电平引导脉冲		
		delay_4720us();//延时4.74毫秒避开4.5毫秒的结果码
		
		/****忽略26位识别码****/
		for(i=0;i<26;i++)
		{
			while(p32==0);
			delay_880us();//高电平开始后用882微秒的时间尺去判断信号此时的高低电平状态
			if(p32==0)
			continue;
			else
			delay_1ms();
		}
		/*处理用户操作码及反码*/
		for(n=0;n<2;n++)
		{
			k=0X01;
			for(i=0;i<8;i++)
			{
				while(p32==0);//等待高电平
					delay_880us();
				if(p32==0)       //检测该位为0或1 并存储到temp
					temp=temp&(~k);
				else
				{
					delay_1ms();
					temp=temp|k;
				}
				k=k<<1;
			}
			if(n==0) REM_h=temp;  //n==0时temp为操作码存到REM_h,n==1时为操作反码存到REM_l
			else REM_l=temp;
		}
		if((~REM_h)==REM_l)
		{
//			P1=REM_h;
			p37=~p37;
			if(REM_h/16<10) a=REM_h/16+'0';
				else a=REM_h/16+'A'-10;
			if(REM_h%16<10) b =REM_h%16+'0';
				else b=REM_h%16+'A'-10;
			DispOneChar(9,1,a);
			DispOneChar(10,1,b);
			DispOneChar(11,1,'H');
		}
	}
	EA=1;
}

void main()
{   
	lcdreset(); //初始化
    delay400ms();
	EA=1;
	IT0=1;
	EX0=1;
	disp(0,2,"  IR Decoder    ");//第一行
	disp(0,1,"KEYCODE:");		//第二行
	while(1);
}