C语言串口通信-源代码

C语言串口通信-源代码

#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 0x20

static int comportaddr;

static char intvectnum;

static unsigned char maskb;

static unsigned char Buffer[MaxBufLen];

static int CharsInBuf,CircIn,CircOut;

static void (interrupt far *OldAsyncInt)();

static void interrupt far AsyncInt(void);

void Init_COM(int ComPortAddr, unsigned 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/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);