serial_rev.c

来自「linux下的人机对话编程」· C语言 代码 · 共 253 行

/*
串口通信实例

2002-1-3


下列代码是一个控制串口的实例：
ole1：MSCOMM32控件；
SuperTracker：是一个接在串口上的设备；
chr()中的值是该设备的指令。

para nnn
serr=0
thisform.ole1.output=chr(2)+chr(6)+chr(3)
ltime=datetime()
do whil thisform.ole1.InBufferCount=0
if datetime()-ltime>12
=msg("警告","得不到SuperTracker的控制信号。","!O")
thisform.ole1.portopen=.f.
serr=1
retu
endif
enddo
mscomm=thisform.ole1.input
if str(mscomm(1),1)+str(mscomm(2),1)+str(mscomm(3),1)<>'263'
=msg("警告","得不到SuperTracker的控制信号。","!O")
thisform.ole1.portopen=.f.
serr=1
retu
endif
do case
case nnn=1
thisform.ole1.output=chr(2)+chr(35)+chr(83)+chr(3)
case nnn=2
thisform.ole1.output=chr(2)+chr(35)+chr(85)+chr(3)
case nnn=3
thisform.ole1.output=chr(2)+chr(35)+chr(66)+chr(3)
endcase
ltime=datetime()
do whil thisform.ole1.InBufferCount=0
if datetime()-ltime>20
=msg("警告","得不到SuperTracker的控制信号。","!O")
thisform.ole1.portopen=.f.
serr=1
retu
endif
enddo
mscomm=thisform.ole1.input
if str(mscomm(1),1)+str(mscomm(2),1)+str(mscomm(3),1)<>'263'
do case
case nnn=1
=msg("警告","SuperTracker无法进卡。","!O")
case nnn=2
=msg("警告","SuperTracker卡在里面。","!O")
case nnn=3
=msg("警告","SuperTracker卡在出口处。","!O")
endcase
thisform.ole1.portopen=.f.
serr=1
retu
endif
*/

#include<stdio.h>      /*标准输入输出定义*/
#include<stdlib.h>     /*标准函数库定义*/
#include<unistd.h>     /*Unix标准函数定义*/
#include<sys/types.h>  /**/
#include<sys/stat.h>   /**/
#include<fcntl.h>      /*文件控制定义*/
#include<termios.h>    /*PPSIX终端控制定义*/
#include<errno.h>      /*错误号定义*/
#define TRUE 1
#define FALSE 0
/***@brief  设置串口通信速率
*@param  fd     类型 int  打开串口的文件句柄
*@param  speed  类型 int  串口速度
*@return  void*/

int speed_arr[] = { B38400, B19200, B9600, B4800, B2400, B1200, B300,
	    B38400, B19200, B9600, B4800, B2400, B1200, B300, };
int name_arr[] = {38400,  19200,  9600,  4800,  2400,  1200,  300,
	    38400,  19200,  9600, 4800, 2400, 1200,  300, };
void set_speed(int fd, int speed)
{
  int   i;
  int   status;
  struct termios   Opt;
  tcgetattr(fd, &Opt);
  for ( i= 0;  i < sizeof(speed_arr) / sizeof(int);  i++)
   {
   	if  (speed == name_arr[i])
   	{
   	    tcflush(fd, TCIOFLUSH);
    	cfsetispeed(&Opt, speed_arr[i]);
    	cfsetospeed(&Opt, speed_arr[i]);
    	status = tcsetattr(fd, TCSANOW, &Opt);
    	if  (status != 0)
            perror("tcsetattr fd1");
     	return;
     	}
   tcflush(fd,TCIOFLUSH);
   }
}
/**
*@brief   设置串口数据位，停止位和效验位
*@param  fd     类型  int  打开的串口文件句柄*
*@param  databits 类型  int 数据位   取值 为 7 或者8*
*@param  stopbits 类型  int 停止位   取值为 1 或者2*
*@param  parity  类型  int  效验类型 取值为N,E,O,,S
*/
int set_Parity(int fd,int databits,int stopbits,int parity)
{
	struct termios options;
 if  ( tcgetattr( fd,&options)  !=  0)
  {
  	perror("SetupSerial 1");
  	return(FALSE);
  }
  options.c_cflag &= ~CSIZE;
  switch (databits) /*设置数据位数*/
  {
  	case 7:
  		options.c_cflag |= CS7;
  		break;
  	case 8:
		options.c_cflag |= CS8;
		break;
	default:
		fprintf(stderr,"Unsupported data size\n");
		return (FALSE);
	}
  switch (parity)
  	{
  	case 'n':
	case 'N':
		options.c_cflag &= ~PARENB;   /* Clear parity enable */
		options.c_iflag &= ~INPCK;     /* Enable parity checking */
		break;
	case 'o':
	case 'O':
		options.c_cflag |= (PARODD | PARENB);  /* 设置为奇效验*/ 
		options.c_iflag |= INPCK;             /* Disnable parity checking */
		break;
	case 'e':
	case 'E':
		options.c_cflag |= PARENB;     /* Enable parity */
		options.c_cflag &= ~PARODD;   /* 转换为偶效验*/  
		options.c_iflag |= INPCK;       /* Disnable parity checking */
		break;
	case 'S':
	case 's':  /*as no parity*/
		options.c_cflag &= ~PARENB;
		options.c_cflag &= ~CSTOPB;
		break;
	default:
		fprintf(stderr,"Unsupported parity\n");
		return (FALSE);
		}
  /* 设置停止位*/   
  switch (stopbits)
  	{
  	case 1:
  		options.c_cflag &= ~CSTOPB;
		break;
	case 2:
		options.c_cflag |= CSTOPB;
		break;
	default:
		fprintf(stderr,"Unsupported stop bits\n");
		return (FALSE);
	}
  /* Set input parity option */
  if (parity != 'n')
  		options.c_iflag |= INPCK;
    options.c_cc[VTIME] = 150; // 15 seconds
    options.c_cc[VMIN] = 0;

  tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */
  if (tcsetattr(fd,TCSANOW,&options) != 0)
  	{
  		perror("SetupSerial 3");
		return (FALSE);
	}
  return (TRUE);
 }
/**
*@breif 打开串口
*/
int OpenDev(char *Dev)
{
int	fd = open( Dev, O_RDWR);//|O_NOCTTY|O_NDELAY);
	if (fd==-1)
		{ /*设置数据位数*/
			perror("Can't Open Serial Port");
			return -1;
		}
	else
	return fd;

}
void Delay10ms(int count)
{
	int i,j,k;
	for(i=0;i<count;i++)
	   for(j=0;j<10;j++)
		for(k=0;k<10240;k++)
	;
}
/**
*@breif 	main()
*/
main()
{
	int nwrite;
        char *dev ="/dev/ttyS1";
        int fd;
	 fd=OpenDev(dev);
                if(fd>0)
                set_speed(fd,19200);
                else
                {
                printf("Can't Open Serial Port!\n");
                exit(0);
                }
                if(set_Parity(fd,8,1,'N')== FALSE)
                {
                    printf("Set Parity Error\n");
                    exit(1);
                }

  while(1)
  	{
		while(1)
		{
		char buff_hold[]="AAAAAAAA";
		write(fd,buff_hold,16);
		break;	
		}//while(1) for hold
 		tcflush(fd,TCIFLUSH);
		
		while(1)
		{
		char buff_rev[16];
		bzero(&buff_rev,16);
		read(fd,buff_rev,16);
		printf("%s\n",buff_rev);
		break;
		}//while(1) for send data
	//Delay10ms(10);
	//sleep(1);
	}//while(1) main
}//main