#include    "at89x52.h"
#define     NULL       0x00//數(shù)據(jù)無效
#define     RESET      0X01//程序復(fù)位
#define     REQUEST    0X02//請求信號
#define     ACK        0x03//應(yīng)答信號，在接收數(shù)據(jù)后發(fā)送ACK信號表示數(shù)據(jù)接收正確，
也位請求信號的應(yīng)答信號
#define     NACK       0x04//應(yīng)答信號，表示接收數(shù)據(jù)錯誤
#define     BUSY       0x05//忙信號，表示正在忙
#define     FREE       0x06//空閑信號，表示處于空閑狀態(tài)
#define     READ_IR    0x0b//讀取紅外
#define     STORE_IR   0x0c//保存數(shù)據(jù)
#define     READ_KEY   0x0d//讀取鍵值
#define     RECEIVE    0Xf400//接收緩沖開始地址
#define     SEND       0xfa00//發(fā)送緩沖開始地址
#define     IR         0x50//紅外接收緩沖開始地址
#define     HEAD       0xaa//數(shù)據(jù)幀頭
#define     TAIL       0x55//數(shù)據(jù)幀尾
#define     SDA        P1_7
#define     SCL        P1_6

unsigned char xdata *buf1;  //接受數(shù)據(jù)緩沖
unsigned int  buf1_length;  //接收到的數(shù)據(jù)實際長度
unsigned char xdata *buf2;  //發(fā)送數(shù)據(jù)緩沖
unsigned int  buf2_length;  //要發(fā)送的數(shù)據(jù)實際長度
bit buf1_flag;    //接收標(biāo)志，1表示接受到一個數(shù)據(jù)幀，0表示沒有接受到數(shù)據(jù)幀或數(shù)據(jù)幀為空
bit buf2_flag;    //發(fā)送標(biāo)志，1表示需要發(fā)送或沒發(fā)送完畢，0表示沒有要發(fā)送的數(shù)據(jù)或發(fā)送完畢
unsigned char state1,state2;         //用來標(biāo)志接收字符的狀態(tài)，state1用來表示接收狀態(tài)，state2用來表示發(fā)送狀態(tài)
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;    //紅外緩沖的指針
    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;       //地址指針
//}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;        //紅外接收標(biāo)志，0為緩沖區(qū)空，1為接收成功，2為緩沖溢出
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{            //采用中斷方式跟查詢方式相結(jié)合的辦法解
碼
   EA=0;                                 //禁止中斷
   if(TF2){                              //判斷是否是溢出還是電平變化產(chǎn)生的中斷
        TF2=0;                           //如果是溢出產(chǎn)生的中斷則清除溢出位，重
新開放中斷退出
        EA=1;
        goto end;
    }
   EXF2=0;                               //清除電平變化產(chǎn)生的中斷位
   *ir=RCAP2H;                            //把捕捉的數(shù)保存起來
   ir++;
   *ir=RCAP2L;
   *ir++;
   F0=1;
   TR0=1;                                 //開啟計數(shù)器0
loop:
   TL0=0;  //將計數(shù)器0重新置為零
   TH0=0;
   while(!EXF2){                         //查詢等待EXF2變?yōu)?
        if(TF0)goto exit;                //檢查有沒超時，如果超時則退出
   };
   EXF2=0;                               //將EXF2清零
   if(!TH0)                            //判斷是否是長低電平脈沖過來了
   {                                     //不是長低電平脈沖而是短低電平
      if(F0)count.b++;                      //短脈沖數(shù)加一
      temp.a[0]=RCAP2H;                  //將捕捉數(shù)臨時存放起來
      temp.a[1]=RCAP2L;
      goto loop;                         //返回繼續(xù)查詢
   }
   else{                                 //是低電平脈沖，則進行處理

       F0=0;
       *ir=temp.a[0];       //把連續(xù)的短脈沖總時間記錄下來
       ir++;
       *ir=temp.a[1];
       ir++;
       *ir=RCAP2H;          //把長電平脈沖時間記錄下來
       ir++;
       *ir=RCAP2L;
       ir++;
       if(ir>=0xda) {
                 goto exit;    //判斷是否溢出緩沖，如果溢出則失敗退出
       }
       goto loop;         //返回繼續(xù)查詢
       }
exit:
       ir_flag=1;       //置ir_flag為1表示接收成功
end:
       ;
}

void rs232(void)   interrupt  4{
     static unsigned char sbuf1,sbuf2,rsbuf1,rsbuf2;      //sbuf1,sbuf2用來接收發(fā)送臨時用，rsbuf1,rsbuf2用來分別用來存放接收發(fā)送的半字節(jié)
     EA=0;                                         //禁止中斷
     if(RI){
         RI=0;                                     //清除接收中斷標(biāo)志位
         sbuf1=SBUF;                               //將接收緩沖的字符復(fù)制到sbuf1
         if(sbuf1==HEAD){                                  //判斷是否幀開頭
                         state1=10;                 //是則把state賦值為10
                         buf1=RECEIVE;              //初始化接收地
址                       
         }
         else{
         switch(state1){
         case 10:sbuf2=sbuf1>>4;                   //把高半字節(jié)右移到的半字節(jié)
                 sbuf2=~sbuf2;                     //把低半字節(jié)取反
                 if((sbuf2&0x0f)!=(sbuf1&0x0f))    //判斷接收是否正確
                      {                            //接收錯誤，有可能接收的是數(shù)據(jù)幀尾，也有可能是接收錯誤
                       if(sbuf1==TAIL)             //判斷是否接收到數(shù)據(jù)幀尾
                            {                      //是接收到數(shù)據(jù)幀尾
                                buf1=RECEIVE;      //初始化接收的地址
                                if(*buf1==RESET)   //判斷是否為復(fù)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;          //將接收狀態(tài)標(biāo)志置為零，接收下一個數(shù)據(jù)幀
                                buf1_flag=1;       //置接收標(biāo)志為1，表示已經(jīng)接收到一個數(shù)據(jù)幀
                                REN=0;             //禁止接收
                            }
                       else
                           {                       //不是接受到數(shù)據(jù)幀尾，表明接收錯誤
                               state1=0;           // 將接收狀態(tài)標(biāo)志置為零，重新接收
                               buf1=RECEIVE;       //初始化發(fā)送的地址
                               *buf1=NACK;         //把NACK信號存入接收緩沖里
                               buf1_flag=1;        //置標(biāo)志位為1，使主程序能對接收錯誤進行處理
                               REN=0;              //禁止接收
                           }

                      }
                 else
                 {                                 //接收正確
                     rsbuf1=~sbuf1;                //按位取反，使高半字節(jié)變原碼
                     rsbuf1&=0xf0;                 //僅保留高半字節(jié)，低半字節(jié)去掉
                     state1=20;                    //將狀態(tài)標(biāo)志置為20，準(zhǔn)備接收低半字節(jié)
                 }
                 break;
         case 20:sbuf2=sbuf1>>4;                   //把高半字節(jié)右移到的半字節(jié)
                 sbuf2=~sbuf2;                     //將低半字節(jié)取反
                 if((sbuf2&0x0f)!=(sbuf1&0x0f))    //判斷接收是否正確
                    {                              //接受錯誤
                        state1=0;                  // 將接收狀態(tài)標(biāo)志置為零，重新接收
                        buf1=RECEIVE;              //初始化接收的地址
                        *buf1=NACK;                //把NACK信號存入發(fā)送緩沖里
                        buf1_flag=1;               //置標(biāo)志位為1，使主程序能對接收錯誤進行處理
                        REN=0;                     //禁止接收
                    }
                 else
                    {
                    sbuf1&=0x0f;                   //僅保留低半字節(jié)，去掉高半字節(jié)
                    rsbuf1|=sbuf1;                 //高低半字節(jié)合并
                    *buf1++=rsbuf1;                //將接收的數(shù)據(jù)保存至接收緩沖里,并且數(shù)據(jù)指針加一
                    buf1_length++;                 //接收數(shù)據(jù)長度加一
                    state1=10;                     //將state1置為10，準(zhǔn)備接收下個字節(jié)的高半字節(jié)
                    }
                 break;

         }
        }
     }
  else{

       TI=0;                                       //清除發(fā)送中斷標(biāo)志
       if(buf2_length)                             //判斷發(fā)送長度是否為零
               {                                   //發(fā)送長度不為零
               if(state2==0)                       //判斷是否發(fā)送高半字節(jié)
                   {                               //發(fā)送高半字節(jié)
                       sbuf2=*buf2;                //將要發(fā)送的字節(jié)送到sbuf2
                       rsbuf2=~sbuf2;              //取反，使高半字節(jié)變?yōu)榉创a
                       sbuf2>>=4;                  //將高半字節(jié)右移到低半字節(jié)
                       rsbuf2&=0xf0;               //保留高半字節(jié)，去掉低半字節(jié)
                       sbuf2&=0x0f;                //保留低半字節(jié)，去掉高半字節(jié)
                       rsbuf2|=sbuf2;              //合并高低半字節(jié)
                       SBUF=rsbuf2;                //發(fā)送出去
                       state2=10;                  //將state2置為10準(zhǔn)備發(fā)送下半字節(jié)
                    }
                else
                    {                              //發(fā)送低半字節(jié)
                       sbuf2=*buf2;                //將要發(fā)送的字節(jié)送到sbuf2
                       buf2++;                     //指針加一
                       buf2_length--;              //發(fā)送數(shù)據(jù)長度減一
                       rsbuf2=~sbuf2;              //取反，使低半字節(jié)變?yōu)榉创a
                       rsbuf2<<=4;                 //將低半字節(jié)反碼左移到高半字節(jié)
                       rsbuf2&=0xf0;               //保留高半字節(jié)，去掉低半字節(jié)
                       sbuf2&=0x0f;                //保留低半字節(jié)，去掉高半字節(jié)
                       rsbuf2|=sbuf2;              //合并高低半字節(jié)
                       SBUF=rsbuf2;                //發(fā)送出
                       state2=0;
                     }
                }
         else
                {                                  //如果發(fā)送數(shù)據(jù)長度為零則發(fā)送數(shù)據(jù)幀尾
                    if(buf2_flag){                 //判斷是否發(fā)過數(shù)據(jù)幀尾
                    SBUF=TAIL;                     //將數(shù)據(jù)幀尾發(fā)送出去
                    while(TI==0);
                    TI=0;
                    buf2_flag=0;                   //置發(fā)送標(biāo)志為零，表示發(fā)送完畢
                    }
                }
  }
  EA=1;                                             //開放中斷
}