6410串口编程初步

串口调试工具3.0，两根usb转串口，一根用于终端调试，一根接串口扩展的com1,com1接pc实现串口助手

{

char *dev[]={"/dev/ttySAC0","/dev/ttySAC1","/dev/ttySAC2"};

long vdisable;

if (comport==1)//涓插彛 1

{

  fd = open( "/dev/ttySAC0", O_RDWR|O_NOCTTY|O_NDELAY);

  if (-1 == fd)
  {

   perror("Can't Open Serial Port0");

   return(-1);

  }

}

{

fd = open( "/dev/ttySAC1", O_RDWR|O_NOCTTY|O_NDELAY);

if (-1 == fd)
  {

  perror("Can't Open Serial Port1");

  return(-1);

  }

}

{

fd = open( "/dev/ttySAC2", O_RDWR|O_NOCTTY|O_NDELAY);

if (-1 == fd)
  {

  perror("Can't Open Serial Port2");

  return(-1);

  }

}

/*鎭㈠涓插彛涓洪樆濉炵姸鎬?/

if(fcntl(fd, F_SETFL, 0)<0)

printf("fcntl failed!\n");

else

printf("fcntl=%d\n",fcntl(fd, F_SETFL,0));

/*娴嬭瘯鏄惁涓虹粓绔澶?/

if(isatty(STDIN_FILENO)==0)

printf("standard input is not a terminal device\n");

else

printf("isatty success!\n");

printf("fd-open=%d\n",fd);

return fd;

struct termios newtio,oldtio;

/*淇濆瓨娴嬭瘯鐜版湁涓插彛鍙傛暟璁剧疆,鍦ㄨ繖閲屽鏋滀覆鍙ｅ彿绛夊嚭閿?浼氭湁鐩稿叧鐨勫嚭閿欎俊鎭?/

if ( tcgetattr( fd,&oldtio) != 0)
{

perror("SetupSerial 1");

return -1;

bzero( &newtio, sizeof( newtio ) );

/*姝ラ涓€,璁剧疆瀛楃澶у皬*/

newtio.c_cflag |= CLOCAL | CREAD;

newtio.c_cflag &= ~CSIZE;

/*璁剧疆鍋滄浣?/

switch( nBits )

  {

   case 7:

   newtio.c_cflag |= CS7;

   break;

   case 8:

   newtio.c_cflag |= CS8;

   break;

  }

/*璁剧疆濂囧伓鏍￠獙浣?/

switch( nEvent )

{

  case 'O': //濂囨暟

  newtio.c_cflag |= PARENB;

  newtio.c_cflag |= PARODD;

  newtio.c_iflag |= (INPCK | ISTRIP);

  break;

  case 'E': //鍋舵暟

  newtio.c_iflag |= (INPCK | ISTRIP);

  newtio.c_cflag |= PARENB;

  newtio.c_cflag &= ~PARODD;

  break;

  case 'N': //鏃犲鍋舵牎楠屼綅

  newtio.c_cflag &= ~PARENB;

  break;

}

/*璁剧疆娉㈢壒鐜?/

switch( nSpeed )

{

  case 2400:

  cfsetispeed(&newtio, B2400);

  cfsetospeed(&newtio, B2400);

  break;

  case 4800:

  cfsetispeed(&newtio, B4800);

  cfsetospeed(&newtio, B4800);

  break;

  case 9600:

  cfsetispeed(&newtio, B9600);

  cfsetospeed(&newtio, B9600);

  break;

  case 115200:

  cfsetispeed(&newtio, B115200);

  cfsetospeed(&newtio, B115200);

  break;

  case 460800:

  cfsetispeed(&newtio, B460800);

  cfsetospeed(&newtio, B460800);

  break;

  default:

  cfsetispeed(&newtio, B9600);

  cfsetospeed(&newtio, B9600);

  break;

}

  /*璁剧疆鍋滄浣?/

  if( nStop == 1 )

  newtio.c_cflag &= ~CSTOPB;

  else if ( nStop == 2 )

  newtio.c_cflag |= CSTOPB;

  /*璁剧疆绛夊緟鏃堕棿鍜屾渶灏忔帴鏀跺瓧绗?/

  newtio.c_cc[VTIME] = 0;

  newtio.c_cc[VMIN] = 0;

  /*澶勭悊鏈帴鏀跺瓧绗?/

  tcflush(fd,TCIFLUSH);

  /*婵€娲绘柊閰嶇疆*/

  if((tcsetattr(fd,TCSANOW,&newtio))!=0)

   {

   perror("com set error");

   return -1;

   }

  printf("set done!\n");

  return 0;

int fd;

int nwrite,i,nread;

//char buff[]="Hello\n";

if((fd=open_port(fd,2))<0)
{
  //鎵撳紑涓插彛

  perror("open_port error");

  return;

if((i=set_opt(fd,115200,8,'N',1))<0)
{//璁剧疆涓插彛

  perror("set_opt error");

  return;

printf("fd=%d\n",fd);

for(i=0; i<100; i++)
{
char buff[]="11\n";
printf("nread=%d,%s\n",nread,buff);
printf("--------This is yuanlai de buff---------\n");
  nwrite=write(fd,buff,sizeof(buff));//鍐欎覆鍙?
  nread=read(fd,buff,1024);

  //printf("nwrite=%d,%s\n",nwrite,buff);
  printf("nread=%d,%s\n",nread,buff);
printf("--------THIS IS CHANGED DUFF-----\n");

  sleep(1);

}

close(fd);

return;

这有个友善的串口例程，参考下吧，用gcc编译可以在linux下用
# include <stdio.h>
# include <stdlib.h>
# include <termio.h>
# include <unistd.h>
# include <fcntl.h>
# include <getopt.h>
# include <time.h>
# include <errno.h>
# include <string.h>

int CommFd, TtyFd;

static void Error(const char *Msg)
{
    fprintf (stderr, "%s\n", Msg);
    fprintf (stderr, "strerror() is %s\n", strerror(errno));
    exit(1);
}
static void Warning(const char *Msg)
{
     fprintf (stderr, "Warning: %s\n", Msg);
}


static int SerialSpeed(const char *SpeedString)
{
    int SpeedNumber = atoi(SpeedString);
#   define TestSpeed(Speed) if (SpeedNumber == Speed) return B##Speed
    TestSpeed(1200);
    TestSpeed(2400);
    TestSpeed(4800);
    TestSpeed(9600);
    TestSpeed(19200);
    TestSpeed(38400);
    TestSpeed(57600);
    TestSpeed(115200);
    TestSpeed(230400);
    Error("Bad speed");
    return -1;
}

static void PrintUsage(void)
{

   fprintf(stderr, "comtest - interactive program of comm port\n");
   fprintf(stderr, "press [ESC] 3 times to quit\n\n");

   fprintf(stderr, "Usage: comtest [-d device] [-t tty] [-s speed] [-7] [-c] [-x] [-o] [-h]\n");
   fprintf(stderr, "         -7 7 bit\n");
   fprintf(stderr, "         -x hex mode\n");
   fprintf(stderr, "         -o output to stdout too\n");
   fprintf(stderr, "         -c stdout output use color\n");
   fprintf(stderr, "         -h print this help\n");
   exit(-1);
}

static inline void WaitFdWriteable(int Fd)
{
    fd_set WriteSetFD;
    FD_ZERO(&WriteSetFD);
    FD_SET(Fd, &WriteSetFD);
    if (select(Fd + 1, NULL, &WriteSetFD, NULL, NULL) < 0) {
   Error(strerror(errno));
    }
 
}

int sendUart(char c)
 {
   WaitFdWriteable(CommFd);
   return write(CommFd, &c, 1);
 }

char recUart()
{
  char c='\0';
  if (FD_ISSET(CommFd, &ReadSetFD))
  {
    if(read(CommFd, &c, 1) == 1) return c;
    else printf("No data to receive.\n");
  }
}

int main(int argc, char **argv)
{
    struct termios TtyAttr;
    struct termios BackupTtyAttr;

    int DeviceSpeed = B115200;
    int TtySpeed = B115200;
    int ByteBits = CS8;
    const char *DeviceName = "/dev/ttyS0";
    const char *TtyName = "/dev/tty";
    int OutputHex = 0;
    int OutputToStdout = 0;
    int UseColor = 0;

    printf("Now we start.\n");
    opterr = 0;
    for (;;) {
        int c = getopt(argc, argv, "d:s:t:7xoch");
        if (c == -1)
            break;
        switch(c) {
        case 'd':
            DeviceName = optarg;
            break;
        case 't':
            TtyName = optarg;
            break;
        case 's':
     if (optarg[0] == 'd') {
  DeviceSpeed = SerialSpeed(optarg + 1);
     } else if (optarg[0] == 't') {
  TtySpeed = SerialSpeed(optarg + 1);
     } else
             TtySpeed = DeviceSpeed = SerialSpeed(optarg);
            break;
 case 'o':
     OutputToStdout = 1;
     break;
 case '7':
     ByteBits = CS7;
     break;
        case 'x':
            OutputHex = 1;
            break;
 case 'c':
     UseColor = 1;
     break;
        case '?':
        case 'h':
        default:
     PrintUsage();
        }
    }
    if (optind != argc)
        PrintUsage();

    CommFd = open(DeviceName, O_RDWR, 0);
    if (CommFd < 0)
 Error("Unable to open device");
    if (fcntl(CommFd, F_SETFL, O_NONBLOCK) < 0)
      Error("Unable set to NONBLOCK mode");



    memset(&TtyAttr, 0, sizeof(struct termios));
    TtyAttr.c_iflag = IGNPAR;
    TtyAttr.c_cflag = DeviceSpeed | HUPCL | ByteBits | CREAD | CLOCAL;
    TtyAttr.c_cc[VMIN] = 1;

    if (tcsetattr(CommFd, TCSANOW, &TtyAttr) < 0)
        Warning("Unable to set comm port");

    TtyFd = open(TtyName, O_RDWR | O_NDELAY, 0);
    if (TtyFd < 0)
 Error("Unable to open tty");

    TtyAttr.c_cflag = TtySpeed | HUPCL | ByteBits | CREAD | CLOCAL;
    if (tcgetattr(TtyFd, &BackupTtyAttr) < 0)
 Error("Unable to get tty");

    if (tcsetattr(TtyFd, TCSANOW, &TtyAttr) < 0)
 Error("Unable to set tty");


    for (;;) {
 unsigned char Char = 0;
 fd_set ReadSetFD;

 void OutputStdChar(FILE *File) {
     char Buffer[10];
     int Len = sprintf(Buffer, OutputHex ? "%.2X  " : "%c", Char);
     fwrite(Buffer, 1, Len, File);
 }

 FD_ZERO(&ReadSetFD);

 FD_SET(CommFd, &ReadSetFD);
 FD_SET( TtyFd, &ReadSetFD);
# define max(x,y) ( ((x) >= (y)) ? (x) : (y) )
 if (select(max(CommFd, TtyFd) + 1, &ReadSetFD, NULL, NULL, NULL) < 0) {
     Error(strerror(errno));
 }
# undef max

 if (FD_ISSET(CommFd, &ReadSetFD)) {
     while (read(CommFd, &Char, 1) == 1) {

  WaitFdWriteable(TtyFd);
  if (write(TtyFd, &Char, 1) < 0) {
        Error(strerror(errno));
  }
  if (OutputToStdout) {
      if (UseColor)
   fwrite("\x1b[01;34m", 1, 8, stdout);
      OutputStdChar(stdout);
      if (UseColor)
   fwrite("\x1b[00m", 1, 8, stdout);
      fflush(stdout);
  }
     }
 }

 if (FD_ISSET(TtyFd, &ReadSetFD)) {
     while (read(TtyFd, &Char, 1) == 1) {
         static int EscKeyCount = 0;
  WaitFdWriteable(CommFd);
         if (write(CommFd, &Char, 1) < 0) {
        Error(strerror(errno));
  }
  if (OutputToStdout) {
      if (UseColor)
   fwrite("\x1b[01;31m", 1, 8, stderr);
      OutputStdChar(stderr);
      if (UseColor)
   fwrite("\x1b[00m", 1, 8, stderr);
      fflush(stderr);
         }

        if (Char == '\x1b') {
                    EscKeyCount ++;
                    if (EscKeyCount >= 3)
                        goto ExitLabel;
                } else
                    EscKeyCount = 0;
     } 
        }

    }

ExitLabel:
    if (tcsetattr(TtyFd, TCSANOW, &BackupTtyAttr) < 0)
 Error("Unable to set tty");

    return 0;
}

6410串口编程初步

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