论坛徽章:: 0

电梯直达

1楼 [收藏(0)] [报告]

发表于 2004-08-02 22:34 |只看该作者 |倒序浏览

两个IMB服务器，运行redhat9，内核为2.4.20，用一根串口线相连，一台发送，另外一台接收后在发送回来，为什么所有的0X0D都被传成0x0a呢？无论用不用奇偶校验，结果都一样。望高手指点。

源码如下：
#include <sys/types.h>;
#include <sys/stat.h>;
#include <stdio.h>;
#include <string.h>;
#include <stdlib.h>;
#include <termios.h>;
#include <unistd.h>;
#include <fcntl.h>;
#include <error.h>;

#define  FALSE -1
#define  TRUE 0

#define  COM1  "/dev/ttyS0"

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)
   {
         tcflush(fd, TCIOFLUSH);
cfsetispeed(&Opt, speed_arr);
cfsetospeed(&Opt, speed_arr);
status = tcsetattr(fd, TCSANOW, &Opt);
if  (status != 0)
         perror("tcsetattr fd1";
     return;
     }
tcflush(fd,TCIOFLUSH);
}
}

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;

options.c_lflag  &= ~(ICANON | ECHO | ECHOE | ISIG);  /*Input*/
options.c_oflag  &= ~OPOST; /*Output*/

  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);
if (-1 == fd)
{
perror("Can't Open Serial Port";
return -1;
}
else
return fd;

}

void main(argc,argv)
int argc;
char **argv;
{
FILE *fpIn;
FILE *fpOut;
int fd;
int readlen;
char pchFileIn[64];
char pchFileOut[64];
char sendbuf[5000];
char rcvbuf[5000];
int writelen=0;
int cnt;

strcpy(pchFileIn, argv[2]);
fpIn = fopen(pchFileIn, "rb";
fd = OpenDev(COM1);
if (fd>;0)
   set_speed(fd,38400);
else
{
   printf("Can't Open Serial Port!\n";
   exit(0);
}
if (set_Parity(fd,8,1,'O')== -1)
{
   printf("Set Parity Error\n";
   exit(1);
}
rcvlen=0;
totallen=0;
writelen=0;

while (fread(sendbuf,100,1,fpIn))
{
   dwErr = write(fd,sendbuf,readlen);       /* send to com1  */
   writelen+=dwErr;
      usleep(1000);

}
close(fd);
fclose(fpIn);
exit(0);
}

读代码：
   for(cnt=0;cnt<3000;cnt++)
      {
      dwErr=read(fd,rcvbuf,0x1000);
      if (dwErr<=0)
         {
           usleep(1000);
           continue;
         }
      totallen+=dwErr;
      dwErr = fwrite(rcvbuf,dwErr,1,fpOut);
      usleep(1000);
      }