求WINDOWS下C语言读写串口的程序

2011-01-07 01:15:52 1.2k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

C语言写个简单的串口调试助手学习单片机或者嵌入式编程常常要用到超级终端–串口调试助手，但有时需要我们自己做一个终端，用来当上位机。最近课设要求我们自己写个终端来处理串口信息，于是乎，接触了一些windows的串口API，做出了一个简单的串口调试助手，很简陋~ Windows把串口当作文件处理，这点很重要！使用串口的基本流程： 1、得到串口的句柄，句柄可以看作一个指针或者是一个实例 2、配置串口，比如收发超时时间、波特率，奇偶校验 3、读写串口一、得到串口句柄使用CreateFile 函数，有8个参数。不懂这些函数的使用点这个链阅读详情

如题，要求：
1.不要TC下面的C程序，要求能在visual studio 6.0下运行的C语言程序。(TC下程序我从网上找到过)
2.不要linux下的C程序

...全文

C/C++语言windows读取串口数据本文使用C/C++语言，对windows下串口读写进行操作。阅读详情

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haoxihuan 2011-01-10

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楼上的read_string和send_string都是我写的。目的是改变每循环一次才接收一个字符的问题。

haoxihuan 2011-01-10

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#include <stdio.h>

#include <dos.h>

#include <conio.h>

#include <io.h>

#include <sys\stat.h>



#define LENGTH 1024



void InitCOM();		//initialize serial port

void OpenPort();	//open serial port

void ClosePort();	//close serial port,release resource



void interrupt far  asyncint();	//new ISR

void interrupt(*asyncoldvect)();//interrupt vector: to reserve interrupt scene



unsigned char Buffer[LENGTH];



int buffin=0;

int buffout=0;



unsigned char rbuf[RWMAXBUFLEN] = {0};



void OpenPort()	//open COM1

{

	unsigned char ucTemp;

	InitCOM();  //initialize serial port



	asyncoldvect=getvect(0x0c);	//COM1 produce hardware interrupt IQR4,corresponding interrupt vector 0CH

	disable();       //close interrupt

	inportb(0x3f8);

	inportb(0x3fe);

	inportb(0x3fb);

	inportb(0x3fa);

	outportb(0x3fc,0x08|0x0b);

	outportb(0x3f9,0x01);

	ucTemp=inportb(0x21)&0xef;	//open IRQ1

	outportb(0x21,ucTemp);

	setvect(0x0c,asyncint);

	enable();       //open interrupt

}



void interrupt far asyncint()	//ISR,receiving data from COM1

{

	//unsigned char ch;

	Buffer[buffin++] = inportb(0x3f8);	//put chars to buffer

	if (buffin>= LENGTH)

		buffin=0;		//pointer reset

	outportb(0x20,0x20);		//send EOI to ICR

}



void ClosePort(void)	//close COM1

{

	disable();

	outportb(0x3f9,0x00);	//close interrupt

	outportb(0x3fc,0x00);

	outportb(0x21,inportb(0x21) & 0x10);

	enable();

	setvect(0x0c,asyncoldvect);

}



void InitCOM()	//initialize serial port

{



	outportb(0x3fb,0x80);  //DLAB=1,which means to set baud rate

	outportb(0x3f8,0x0C);  //set baud rate as 9600bps

	outportb(0x3f9,0x00);



	outportb(0x3fb,0x03);  //set 8 databits,1 stopbit and no parity

	outportb(0x3fc,0x08|0x0b);

	outportb(0x3f9,0x01);

}



unsigned char read_char(void)	//read received data from buffer

{

	unsigned unch;

	if(buffout != buffin)

	{

		unch = Buffer[buffout];

		buffout++;

		if(buffout >= LENGTH)

			buffout=0;	//pointer reset

		return(unch);

	}

	else

		return(0xff);

}



unsigned char* read_string(void)

{ 	

     if(buffout<=buffin)

     {

		unsigned char * temp =(unsigned char *) malloc(buffin-buffout+1);

		memcpy(temp, &Buffer[buffout],buffin-buffout+1);

		buffout= buffin;

		if(buffout>=LENGTH)

			buffout=0; 		//pointer reset

		return temp;

	}

	else if(buffout > buffin)

	{

		unsigned char *temp =(unsigned char *)malloc(LENGTH-buffout+buffin+2);

		memcpy(temp,&Buffer[buffout],LENGTH-buffout+1);

		strncat(temp,Buffer,buffin+1);

		buffout = buffin;

		if(buffout>=LENGTH)

			buffout=0; 		//pointer reset

		return temp;

	}

	else

		return (0xff);

}



void send_char(unsigned char unch)

{

   while ( ((inp( 0x3f8 + 5)) & 0x40 ) == 0); //get D6 and check it to avoid lost data to be sent

   outportb(0x3f8 , unch);

}

/*

void send_string(int nStrlen,char *ChBuf)

{

	int k=0;

	do {

		send_char(*(ChBuf + k));

		k++;

	} while ((k < nStrlen));

}

*/

void send_string(char * chBuf)

{

	char *temp = chBuf;

	do{

		 send_char(*temp++);

		}while(*temp!='\0');

}



void main()		//main func as follow

{

	unsigned char unChar;

	short bExit_Flag = 0;

	

	int i =0;

	OpenPort(); 	//open the serial port



	fprintf(stdout, "\n\nReady to Receive and Send DATA\n"

			"press [ESC] to quit...\n\n");

	do {



		if ( kbhit() )			//press any key and check it

		{

			unChar = getch();

			switch(unChar)

			{

			case 0x1B:			//the ASCII value of ESC is 27

				bExit_Flag = 1;	//Exit program

				break;

		     	default:

				break;

			}

			

	

			if(!bExit_Flag)

				send_char(unChar);  //send the char

	

		}

		

		unChar = read_char();		//get the received char,可添加接收处理函数部分

		if (unChar != 0xff)

		{

			fprintf(stdout,"%c",unChar);

		}

		

	} while ( !bExit_Flag );

	

	ClosePort();			//close serial port

}

haoxihuan 2011-01-10

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[Quote=引用 5 楼 subfate 的回复:]
看来只有windows API适合楼主的要求了，可以看看龚建伟写的书，里面介绍几种方法：
1、使用第3方串口类；
2、控件；
3、API
百度一下“龚建伟”。
[/Quote]

龚建伟的书我看过。那本书唯一的一个C语言串口读写程序是运行在TC下的。其他的都是C++程序。我需要的是运行在visual studio的C程序。