红外线遥控器软件解码程序(能解大部分遥控器的编码)

红外线一开始发送一段13.5ms的引导码，引导码由9ms的高电平和4.5ms的低电平组成，跟着引导码是系统码，系统反码，按键码，按键反码，如果按着键不放，则遥控器则发送一段重复码，重复码由9ms的高电平，2.25ms的低电平，跟着是一个短脉冲，本程序是免费给大家，版权所有，不得用于商业目的，如需用到本程序到商业上请与本人联系经本人同意后方可用于商业目的，本程序经过试用，能解大部分遥控器的编码！

#include    "at89x52.h"
#define     NULL       0x00//数据无效
#define     RESET      0X01//程序复位
#define     REQUEST    0X02//请求信号
#define     ACK        0x03//应答信号，在接收数据后发送ACK信号表示数据接收正确，
也位请求信号的应答信号
#define     NACK       0x04//应答信号，表示接收数据错误
#define     BUSY       0x05//忙信号，表示正在忙
#define     FREE       0x06//空闲信号，表示处于空闲状态
#define     READ_IR    0x0b//读取红外
#define     STORE_IR   0x0c//保存数据
#define     READ_KEY   0x0d//读取键值
#define     RECEIVE    0Xf400//接收缓冲开始地址
#define     SEND       0xfa00//发送缓冲开始地址
#define     IR         0x50//红外接收缓冲开始地址
#define     HEAD       0xaa//数据帧头
#define     TAIL       0x55//数据帧尾
#define     SDA        P1_7
#define     SCL        P1_6


unsigned char xdata *buf1;  //接受数据缓冲
unsigned int  buf1_length;  //接收到的数据实际长度
unsigned char xdata *buf2;  //发送数据缓冲
unsigned int  buf2_length;  //要发送的数据实际长度
bit buf1_flag;    //接收标志，1表示接受到一个数据帧，0表示没有接受到数据帧或数据
帧为空
bit buf2_flag;    //发送标志，1表示需要发送或没发送完毕，0表示没有要发送的数据或
发送完毕
unsigned char state1,state2;         //用来标志接收字符的状态，state1用来表示接
收状态，state2用来表示发送状态
unsigned char data *ir;
union{
    unsigned char a[2];
    unsigned int b;
    unsigned char data *p1[2];
    unsigned int data *p2[2];
    unsigned char xdata *p3;    //红外缓冲的指针
    unsigned int xdata *p4;
}p;
//union{                       //
  //  unsigned char a[2];           //
  //  unsigned int b;
  //  unsigned char data *p1[2];
  //  unsigned int data *p2[2];
  //  unsigned char xdata *p3;
  //  unsigned int xdata *p4;       //地址指针
//}q;                        //

union{
   unsigned char a[2];
   unsigned int b;
}count;
union{
   unsigned char a[2];
   unsigned int b;
}temp;
union{
   unsigned char a[4];
   unsigned int b[2];
   unsigned long c;
}ir_code;

union{
   unsigned char a[4];
   unsigned int b[2];
   unsigned long c;
   unsigned char data *p1[4];
   unsigned int data *p2[4];
   unsigned char xdata *p3[2];
   unsigned int xdata *p4[2];
}I;
unsigned char ir_key;
bit ir_flag;        //红外接收标志，0为缓冲区空，1为接收成功，2为缓冲溢出
void sub(void);
void delay(void);
void ie_0(void);
void tf_0(void);
void ie_1(void);
void tf_1(void);
void tf_2(void);
void read_ir(void);
void ir_jiema(void);
void ir_init(void);
void ir_exit(void);
void store_ir(void);
void read_key(void);
void reset_iIC(void);
unsigned char read_byte_ack_iic(void);
unsigned char read_byte_nack_iic(void);
bit write_byte_iic(unsigned char a);
void send_ack_iic(void);
void send_nack_iic(void);
bit receive_ack_iic(void);
void start_iic(void);
void stop_iic(void);
void write_key_data(unsigned char a);
unsigned int read_key_data(unsigned char a);
void ie0(void)   interrupt 0{ie_0();}
void tf0(void)   interrupt 1{tf_0();}
void ie1(void)   interrupt 2{ie_1();}
void tf1(void)   interrupt 3{tf_1();tf_2();}
void tf2(void)   interrupt 5{            //采用中断方式跟查询方式相结合的办法解码
   EA=0;                                 //禁止中断
   if(TF2){                              //判断是否是溢出还是电平变化产生的中断
        TF2=0;                           //如果是溢出产生的中断则清除溢出位，重新开放中断退出
        EA=1;
        goto end;
    }
   EXF2=0;                               //清除电平变化产生的中断位
   *ir=RCAP2H;                            //把捕捉的数保存起来
   ir++;
   *ir=RCAP2L;
   *ir++;
   F0=1;
   TR0=1;                                 //开启计数器0
loop:
   TL0=0;  //将计数器0重新置为零
   TH0=0;
   while(!EXF2){                         //查询等待EXF2变为1
        if(TF0)goto exit;                //检查有没超时，如果超时则退出
   };
   EXF2=0;                               //将EXF2清零
   if(!TH0)                            //判断是否是长低电平脉冲过来了
   {                                     //不是长低电平脉冲而是短低电平
      if(F0)count.b++;                      //短脉冲数加一
      temp.a[0]=RCAP2H;                  //将捕捉数临时存放起来
      temp.a[1]=RCAP2L;
      goto loop;                         //返回继续查询
   }
   else{                                 //是低电平脉冲，则进行处理

       F0=0;
       *ir=temp.a[0];       //把连续的短脉冲总时间记录下来
       ir++;
       *ir=temp.a[1];
       ir++;
       *ir=RCAP2H;          //把长电平脉冲时间记录下来
       ir++;
       *ir=RCAP2L;
       ir++;
       if(ir>=0xda) {
                 goto exit;    //判断是否溢出缓冲，如果溢出则失败退出
       }
       goto loop;         //返回继续查询
       }
exit:
       ir_flag=1;       //置ir_flag为1表示接收成功
end:
       ;
}


void rs232(void)   interrupt  4{
     static unsigned char sbuf1,sbuf2,rsbuf1,rsbuf2;      //sbuf1,sbuf2用来接收
发送临时用，rsbuf1,rsbuf2用来分别用来存放接收发送的半字节
     EA=0;                                         //禁止中断
     if(RI){
         RI=0;                                     //清除接收中断标志位
         sbuf1=SBUF;                               //将接收缓冲的字符复制到sbuf1
         if(sbuf1==HEAD){                                  //判断是否帧开头
                         state1=10;                 //是则把state赋值为10
                         buf1=RECEIVE;              //初始化接收地址                        
         }
         else{
         switch(state1){
         case 10:sbuf2=sbuf1>>4;                   //把高半字节右移到的半字节
                 sbuf2=~sbuf2;                     //把低半字节取反
                 if((sbuf2&0x0f)!=(sbuf1&0x0f))    //判断接收是否正确
                      {                            //接收错误，有可能接收的是数据帧尾，也有可能是接收错误
                       if(sbuf1==TAIL)             //判断是否接收到数据帧尾
                            {                      //是接收到数据帧尾
                                buf1=RECEIVE;      //初始化接收的地址
                                if(*buf1==RESET)   //判断是否为复位命令
                                     {
                                        ES=0;
                                        sbuf2=SP+1;
                                        for(p.p1[0]=SP-0x10;p.p1[0]<=sbuf2;p.p1
[0]++)*p.p1[0]=0;
                                     }
                                state1=0;          //将接收状态标志置为零，接收下一个数据帧
                                buf1_flag=1;       //置接收标志为1，表示已经接收到一个数据帧
                                REN=0;             //禁止接收
                            }
                       else
                           {                       //不是接受到数据帧尾，表明接收错误
                               state1=0;           // 将接收状态标志置为零，重新接收
                               buf1=RECEIVE;       //初始化发送的地址
                               *buf1=NACK;         //把NACK信号存入接收缓冲里
                               buf1_flag=1;        //置标志位为1，使主程序能对接收错误进行处理
                               REN=0;              //禁止接收
                           }

                      }
                 else
                 {                                 //接收正确
                     rsbuf1=~sbuf1;                //按位取反，使高半字节变原码
                     rsbuf1&=0xf0;                 //仅保留高半字节，低半字节去掉
                     state1=20;                    //将状态标志置为20，准备接收低半字节
                 }
                 break;
         case 20:sbuf2=sbuf1>>4;                   //把高半字节右移到的半字节
                 sbuf2=~sbuf2;                     //将低半字节取反
                 if((sbuf2&0x0f)!=(sbuf1&0x0f))    //判断接收是否正确
                    {                              //接受错误
                        state1=0;                  // 将接收状态标志置为零，重新接收
                        buf1=RECEIVE;              //初始化接收的地址
                        *buf1=NACK;                //把NACK信号存入发送缓冲里
                        buf1_flag=1;               //置标志位为1，使主程序能对接收错误进行处理
                        REN=0;                     //禁止接收
                    }
                 else
                    {
                    sbuf1&=0x0f;                   //仅保留低半字节，去掉高半字节
                    rsbuf1|=sbuf1;                 //高低半字节合并
                    *buf1++=rsbuf1;                //将接收的数据保存至接收缓冲里,并且数据指针加一
                    buf1_length++;                 //接收数据长度加一
                    state1=10;                     //将state1置为10，准备接收下个字节的高半字节
                    }
                 break;

         }
         }



     }
  else{

       TI=0;                                       //清除发送中断标志
       if(buf2_length)                             //判断发送长度是否为零
               {                                   //发送长度不为零
               if(state2==0)                       //判断是否发送高半字节
                   {                               //发送高半字节
                       sbuf2=*buf2;                //将要发送的字节送到sbuf2
                       rsbuf2=~sbuf2;              //取反，使高半字节变为反码
                       sbuf2>>=4;                  //将高半字节右移到低半字节
                       rsbuf2&=0xf0;               //保留高半字节，去掉低半字节
                       sbuf2&=0x0f;                //保留低半字节，去掉高半字节
                       rsbuf2|=sbuf2;              //合并高低半字节
                       SBUF=rsbuf2;                //发送出去
                       state2=10;                  //将state2置为10准备发送下半字节
                    }
                else
                    {                              //发送低半字节
                       sbuf2=*buf2;                //将要发送的字节送到sbuf2
                       buf2++;                     //指针加一
                       buf2_length--;              //发送数据长度减一
                       rsbuf2=~sbuf2;              //取反，使低半字节变为反码
                       rsbuf2<<=4;                 //将低半字节反码左移到高半字节
                       rsbuf2&=0xf0;               //保留高半字节，去掉低半字节
                       sbuf2&=0x0f;                //保留低半字节，去掉高半字节
                       rsbuf2|=sbuf2;              //合并高低半字节
                       SBUF=rsbuf2;                //发送出
                       state2=0;
                     }
                }
         else
                {                                  //如果发送数据长度为零则发送数据帧尾
                    if(buf2_flag){                 //判断是否发过数据帧尾
                    SBUF=TAIL;                     //将数据帧尾发送出去
                    while(TI==0);
                    TI=0;
                    buf2_flag=0;                   //置发送标志为零，表示发送完毕
                    }
                }
  }
  EA=1;                                             //开放中断
}