【嵌入式開發技術之串口】Linux下串口主機程式

來源:互聯網
上載者:User

作者:gnuhpc 
出處:http://www.cnblogs.com/gnuhpc/

#include     <stdio.h>      /*標準輸入輸出定義*/#include     <stdlib.h>     /*標準函數庫定義*/#include     <unistd.h>     /*Unix標準函數定義*/#include     <sys/types.h>  /**/#include     <sys/stat.h>   /**/#include     <fcntl.h>      /*檔案控制定義*/#include     <termios.h>    /*PPSIX終端控制定義*/#include     <errno.h>      /*錯誤號碼定義*//***@brief  設定串口通訊速率*@param  fd     類型 int  開啟串口的檔案控制代碼*@param  speed  類型 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   設定串口資料位元,停止位和效驗位*@param  fd     類型  int  開啟的串口檔案控制代碼**@param  databits 類型  int 資料位元   取值 為 7 或者8**@param  stopbits 類型  int 停止位   取值為 1 或者2**@param  parity  類型  int  效驗類型 取值為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) /*設定資料位元數*/  {      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);  /* 設定為奇效驗*/         options.c_iflag |= INPCK;             /* Disnable parity checking */        break;    case 'e':    case 'E':        options.c_cflag |= PARENB;     /* Enable parity */        options.c_cflag &= ~PARODD;   /* 轉換為偶效驗*/          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);        }  /* 設定停止位*/     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 開啟串口*/int OpenDev(char *Dev){int    fd = open( Dev, O_RDWR );         //| O_NOCTTY | O_NDELAY    if (-1 == fd)        { /*設定資料位元數*/            perror("Can't Open Serial Port");            return -1;        }    else    return fd;}/***@breif     main()*/int main(int argc, char **argv){    int fd;    int nread;    char buff[512];    char *dev ="/dev/ttyS1";    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((nread = read(fd,buff,512))>0)           {              printf("/nLen %d/n",nread);              buff[nread+1]='/0';              printf("/n%s",buff);            }      }    //close(fd);    //exit(0);}
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