一个c语言的串口通信程序范例.doc

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1、#include#include#include#include#defineCOM232 0x2f8#defineCOMINT 0x0b#defineMaxBufLen     500#definePort8259      0x20#defineEofInt       0x20staticint comportaddr;staticcharintvectnum;staticunsignedcharmaskb;staticunsignedcharBuffer[MaxBufLen];

2、staticint CharsInBuf,CircIn,CircOut;staticvoid(interruptfar*OldAsyncInt)();staticvoidinterruptfarAsyncInt(void);voidInit_COM(intComPortAddr,unsignedcharIntVectNum,intBaud,      unsignedcharData,unsignedcharStop,unsignedcharParity){ unsignedcharHigh,Low; intf; comportaddr=ComPortA

3、ddr; intvectnum=IntVectNum; CharsInBuf=0;CircIn=0;CircOut=0;  f=(Baud/100); f=1152/f;High=f/256; Low=f-High*256; outp(ComPortAddr+3,0x80); outp(ComPortAddr,Low); outp(ComPortAddr+1,High);  Data=(Data-5)

4、((Stop-1)*4); if(Parity==2)Data=Data

5、0x18; elseif(Parity==1)Data=Data

6、0x8; ou

7、tp(ComPortAddr+3,Data);  outp(ComPortAddr+4,0x0a);  outp(ComPortAddr+1,0x01);  disable(); OldAsyncInt=getvect(IntVectNum); setvect(IntVectNum,AsyncInt); enable();  maskb=inp(Port8259+1); if(IntVectNum==0x0c)outp(Port8259+1,maskb&0xef); elseoutp(Port8259+1,maskb&0xf7);            

8、  }staticvoidinterruptfarAsyncInt(void){ disable(); if(CharsInBuf

9、yncInt); outp(Port8259+1,maskb); }intGetCharInBuf(unsignedchar*Char){ intFlag; Flag=-1; if(CharsInBuf>0) {  (*Char)=Buffer[CircOut];  if(CircOut

10、0)==0)return-1; outp(comportaddr,Char); return0;}main(){ inti,c; unsignedcharInChar; Init_COM(COM232,COMINT,1200,8,1,0); while(1) {  if(kbhit())    {if((InChar=getch())==27)break;     elsewhile(SendChar(InChar));    }  if(GetCharInBuf(&InChar)==0)      printf("%c",InChar); }Resto

11、re();}