单片机串口通信协议程序

#include #include #define R55 101 #define RAA 202 #define RLEN 203 #define RDATA 104 #define RCH 105 //#define

unsigned char gRecState=R55; unsigned char gRecLen; unsigned char gRecCount; unsigned char RecBuf[30]; unsigned char gValue;

void isr_UART(void) interrupt 4 using 1 {

unsigned char ch; unsigned char i; unsigned char temp;

if (RI==1) {

ch=SBUF; switch(gRecState) { case R55:

// wait 0x55

if (ch==0x55) break;

gRecState=RAA;

case RAA:

if (ch==0xaa)

gRecState=RLEN;

else if (ch==0x55) else break;

gRecState=R55;

gRecState=RAA;

case RLEN:

gRecLen=ch; gRecCount=0; gRecState=RDATA; break;

case RDATA:

RecBuf[gRecCount]=ch; gRecCount++;

if (gRecCount>=gRecLen) { } break;

gRecState=RCH;

case RCH:

temp=0;

for(i=0;i

temp=temp^ RecBuf[i];

if (temp==ch) else

gValue=0; gValue=1;

// }

XBYTE[0xd000]=0x00; gRecState=R55; break;

default:

gRecState=R55; break;

} RI=0;

}

if (TI==1) {

}

void initcom() {

//8,n.1 SCON=0x50; PCON=0x00; //baud rate TH1=0xfd; TL1=0xfd; //timer1 TMOD=0x20; TR1=1; ES=1;

}

EA=1;

void cmdexecute() { }

void main() {

}

}

if (gValue==1) {

switch(RecBuf[0]) { case 1:

XBYTE[0xd000]=0x00; break;

case 2:

XBYTE[0xd000]=0xff; break;

case 3:

break;

case 4:

break;

gValue=0;

// }

XBYTE[0xd000]=0x00;

initcom(); while(1) { }

cmdexecute(); ;

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