pccom.cpp

大学微型计算机接口技术实验源代码,直接就可以运行,包含了C++和asm代码,比较前面.

#include <bios.h>
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>
#include <dos.h>

extern void clrscr();
extern int getch();

void receive();
void send(char sendchar);
main()
{
char c,sletter;
int getvalue=0;
int temp=-1;
int status=0;
	for(;;)
	{
		clrscr();
		printf("\n 0---110\n 1---150\n 2---300\n 3---600\n 4---1200\n 5---2400\n 6---4800\n 7---9600\n");

		getvalue=getch();
		if((getvalue<'0') || (getvalue>'7'))
		{
			printf("\n Input error! try again please! \n");	//error message
			getch();
			continue;
		}
		else
		{
			printf("you have select the %c baud rate!\n",getvalue);
			break;
		}
	}
temp = getvalue - '0';
switch(temp)
{
	case 0:
		bioscom(0,0x03,0);	//设置通信参数为 com1 <110 N 8 1>
	break;
	case 1:
		bioscom(0,0x23,0);	//设置通信参数为 com1 <150 N 8 1>
	break;
	case 2:
		bioscom(0,0x43,0);	//设置通信参数为 com1 <300 N 8 1>
	break;
	case 3:
		bioscom(0,0x63,0);	//设置通信参数为 com1 <600 N 8 1>
	break;
	case 4:
		bioscom(0,0x83,0);	//设置通信参数为 com1 <1200 N 8 1>
	break;
	case 5:
		bioscom(0,0xa3,0);	//设置通信参数为 com1 <2400 N 8 1>
	break;
	case 6:
		bioscom(0,0xc3,0);	//设置通信参数为 com1 <4800 N 8 1>
	break;
	case 7:
		bioscom(0,0xe3,0);	//设置通信参数为 com1 <9600 N 8 1>
	break;
}

	for(;;)//判断是否Esc键
	{
		if (kbhit())	//若无键按下，则转接收
			{
				sletter=getche();
				if(sletter==0x1b)//是ESC？是，则退出，并返回DOS
				{
					return 0;
				}
				else
				{	
					printf("%c",sletter);
					send(sletter);				}
			}
		else
			{
				receive();
			}
	}
}

void receive()
{
    int s;
    char c;
        s=bioscom(3,0,0)&0x100;
        if(s)
        {
            c=bioscom(2,0,0);
            printf("%c",c);
        }
}
void send(char sendchar)
{
        bioscom(1,sendchar,0);
		    delay(50);
}

/*void send(char *title)
{
    int s;
    do 
	{
      bioscom(1,*title++,0);
        while(1)
        {
            s=bioscom(3,0,0)&0x100;
            if(s)
            {
                if(bioscom(2,0,0)==*title) 
						break;
            }
        }
      }while(*title!='\0');
} */