一个c语言的串口通信程序范例

1、精选文档#include <stdio.h>#include <dos.h>#include <conio.h>#include <string.h>#define COM232  0x2f8#define COMINT  0x0b#define MaxBufLen      500#define Port8259       0x20#define EofInt    

2、0;   0x20static int  comportaddr;static char intvectnum;static unsigned char maskb;static unsigned char BufferMaxBufLen;static int  CharsInBuf,CircIn,CircOut;static void (interrupt far *OldAsyncInt)();static void interrupt far AsyncInt(void);void Init_COM(int ComPortAddr, unsigne

3、d char IntVectNum, int Baud,       unsigned char Data, unsigned char Stop, unsigned char Parity) unsigned char High,Low; int f; comportaddr=ComPortAddr; intvectnum=IntVectNum; CharsInBuf=0;CircIn=0;CircOut=0;  f=(Baud/100); f=1152

4、/f; High=f/256; Low=f-High*256; outp(ComPortAddr+3,0x80); outp(ComPortAddr,Low); outp(ComPortAddr+1,High);  Data=(Data-5)|(Stop-1)*4); if(Parity=2) Data=Data|0x18; else if(Parity=1) Data=Data|0x8; outp(ComPortAddr+3,Data);  outp(ComPortAddr+4,0x

5、0a);  outp(ComPortAddr+1,0x01);  disable(); OldAsyncInt=getvect( IntVectNum ); setvect( IntVectNum, AsyncInt ); enable();  maskb=inp(Port8259+1); if(IntVectNum=0x0c)outp(Port8259+1,maskb&0xef); else outp(Port8259+1,maskb&0xf7); 

6、0;            static void interrupt far AsyncInt(void) disable(); if(CharsInBuf<MaxBufLen)  BufferCircIn=inp(comportaddr); if(CircIn<MaxBufLen-1) CircIn+; else CircIn=0; if(CircIn=CircOut) CircOut+; 

7、else CharsInBuf+; enable(); outp(Port8259,EofInt);void Restore(void) setvect(intvectnum,OldAsyncInt); outp(Port8259+1,maskb); int GetCharInBuf(unsigned char *Char) int Flag; Flag=-1; if(CharsInBuf>0)     (*Char)=BufferCircOut;   if(

8、CircOut<MaxBufLen-1)CircOut+;   else CircOut=0;   CharsInBuf-;   Flag=0;     return Flag;int SendChar(unsigned char Char) if(inp(comportaddr+5)&0x20)=0) return -1; outp(comportaddr,Char); return 0;main() int i,c; unsigned char InChar; Init_COM(COM232,COMINT,1200,8,1,0); while(1)     if(kbhit()     if(InChar=getch()=27)break;      else while(SendChar(InChar);