1,Linux 下打开串口设备，信号模型 读写程序

2,串口读写的IO复用Select模型

3, Linux 下打开串口设备，读写程序

1,Linux 下打开串口设备，信号模型 读写程序


root@linux:/tmp/serial# cat main.c
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<termios.h>
#include<errno.h>  #define FALSE -1
#define TRUE 0  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);     }    }
}  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)   {     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);   options.c_iflag |= INPCK;             /* Disnable parity checking */   break;    case 'e':    case 'E':     options.c_cflag |= PARENB;     /* Enable parity */      options.c_cflag &= ~PARODD;      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);    }    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;   tcflush(fd,TCIFLUSH);  options.c_cc[VTIME] = 150;   options.c_cc[VMIN] = 0; /* Update the options and do it NOW */  if (tcsetattr(fd,TCSANOW,&options) != 0)     {   perror("SetupSerial 3");     return (FALSE);    }   return (TRUE);
}  int main()
{  int fd;  fd = open("/dev/ttyUSB0",O_RDWR);  if(fd == -1)  {  perror("serialport error\n");  }  else  {  printf("open ");  printf("%s",ttyname(fd));  printf(" succesfully\n");  }  set_speed(fd,115200);  if (set_Parity(fd,8,1,'N') == FALSE)  {  printf("Set Parity Error\n");  exit (0);  }  char buf[] = "1234567890123456789012345678901234567890";int n= write(fd,buf,strlen(buf));  printf("字符串实际长度%zd \n", strlen(buf));printf("成功写入%d \n", n);char buff[512];   int nread;    while(1)  {  if((nread = read(fd, buff, 512))>0)  {  printf("Len: %d:",nread);  buff[nread] = '\0';  printf("%s \n",buff);  }  }  close(fd);  return 0;
}
root@linux:/tmp/serial# gcc -Wall main.c && ./a.out
open /dev/ttyUSB0 succesfully
字符串实际长度40
成功写入40
Len: 32:12345678901234567890123456789012
Len: 8:34567890
^C
root@linux:/tmp/serial#



2,串口读写的IO复用Select模型


root@linux:/tmp/serial# cat main.c
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<sys/signal.h>
#include<fcntl.h>
#include<termios.h>
#include<errno.h>  #define FALSE -1
#define TRUE 0
#define flag 1
#define noflag 0  int wait_flag = noflag;
int STOP = 0;
int res;  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);  }  }
}  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)  {  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);  options.c_iflag |= INPCK; /* Disnable parity checking */  break;  case 'e':  case 'E':  options.c_cflag |= PARENB;    /* Enable parity */  options.c_cflag &= ~PARODD;  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);  }  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;  tcflush (fd, TCIFLUSH);  options.c_cc[VTIME] = 150;  options.c_cc[VMIN] = 0;   /* Update the options and do it NOW */  if (tcsetattr (fd, TCSANOW, &options) != 0)  {  perror ("SetupSerial 3");  return (FALSE);  }  return (TRUE);
}  void signal_handler_IO (int status)
{  printf ("received SIGIO signale.\n");  wait_flag = noflag;
}  int main ()
{  int fd;  struct sigaction saio;  fd = open ("/dev/ttyUSB0", O_RDWR);  if (fd == -1)  {  perror ("serialport error\n");  }  else  {  printf ("open ");  printf ("%s", ttyname (fd));  printf (" succesfully\n");  }  saio.sa_handler = signal_handler_IO;  sigemptyset (&saio.sa_mask);  saio.sa_flags = 0;  saio.sa_restorer = NULL;  sigaction (SIGIO, &saio, NULL);  //allow the process to receive SIGIO  fcntl (fd, F_SETOWN, getpid ());  //make the file descriptor asynchronous  fcntl (fd, F_SETFL, FASYNC);  set_speed (fd, 115200);  if (set_Parity (fd, 8, 1, 'N') == FALSE)  {  printf ("Set Parity Error\n");  exit (0);  }  char str[] = "1234567890123456789012345678901234567890";int n= write(fd,str,strlen(str));  printf("字符串实际长度%zd \n", strlen(str));printf("成功写入%d \n", n);char buf[255];  while (STOP == 0)  {  usleep (100000);  /* after receving SIGIO ,wait_flag = FALSE,input is availabe and can be read */  if (wait_flag == 0)  {  memset (buf, 0, sizeof(buf));  res = read (fd, buf, 255);  printf ("nread=%d,%s\n", res, buf);  //    if (res ==1)  //      STOP = 1;       /*stop loop if only a CR was input */  wait_flag = flag; /*wait for new input */  }  }  close (fd);  return 0;
}
root@linux:/tmp/serial# gcc -Wall main.c && ./a.out
open /dev/ttyUSB0 succesfully
字符串实际长度40
成功写入40
received SIGIO signale.
received SIGIO signale.
nread=32,12345678901234567890123456789012
received SIGIO signale.
nread=8,34567890
^C
root@linux:/tmp/serial#


3, Linux 下打开串口设备，读写程序


root@linux:/tmp/serial# cat main.c
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<sys/signal.h>
#include<fcntl.h>
#include<termios.h>
#include<errno.h>  #define FALSE -1
#define TRUE 0
#define flag 1
#define noflag 0  int wait_flag = noflag;
int STOP = 0;
int res;  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);  }  }
}  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)  {  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);  options.c_iflag |= INPCK; /* Disnable parity checking */  break;  case 'e':  case 'E':  options.c_cflag |= PARENB;    /* Enable parity */  options.c_cflag &= ~PARODD;  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);  }  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;  tcflush (fd, TCIFLUSH);  options.c_cc[VTIME] = 150;  options.c_cc[VMIN] = 0;   /* Update the options and do it NOW */  if (tcsetattr (fd, TCSANOW, &options) != 0)  {  perror ("SetupSerial 3");  return (FALSE);  }  return (TRUE);
}  void signal_handler_IO (int status)
{  printf ("received SIGIO signale.\n");  wait_flag = noflag;
}  int main ()
{  int fd;  fd = open ("/dev/ttyUSB0", O_RDWR);  if (fd == -1)  {  perror ("serialport error\n");  }  else  {  printf ("open ");  printf ("%s", ttyname (fd));  printf (" succesfully\n");  }  set_speed (fd, 115200);  if (set_Parity (fd, 8, 1, 'N') == FALSE)  {  printf ("Set Parity Error\n");  exit (0);  }  char str[] = "1234567890123456789012345678901234567890";int n= write(fd,str,strlen(str));  printf("字符串实际长度%zd \n", strlen(str));printf("成功写入%d \n", n);char buf[255];  fd_set rd;  int nread = 0;  while(1)  {  FD_ZERO(&rd);  FD_SET(fd, &rd);  while(FD_ISSET(fd, &rd))  {  if(select(fd+1, &rd, NULL,NULL,NULL) < 0)  {  perror("select error\n");  }  else  {  while((nread = read(fd, buf, sizeof(buf))) > 0)  {  printf("nread= %02d,%s\n",nread, buf);  memset(buf, 0 , sizeof(buf));  }  }  }  }  close (fd);  return 0;
}
root@linux:/tmp/serial# gcc -Wall main.c && ./a.out
open /dev/ttyUSB0 succesfully
字符串实际长度40
成功写入40
nread= 32,12345678901234567890123456789012
nread= 08,34567890

转载于:https://blog.51cto.com/990487026/1901695

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