#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*/

#include     <sys/time.h>

/***@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*/

#define TRUE 1

#define FALSE -1

int speed_arr[] = {B115200, B38400, B19200, B9600, B4800, B2400, B1200, B300,

        B38400, B19200, B9600, B4800, B2400, B1200, B300, };

int name_arr[] = {, ,  ,  ,  ,  ,  ,  ,

        ,  ,  , , , ,  , };

void set_speed(int fd, int speed)

{

  int   i;

  int   status;

  struct termios   Opt;

  tcgetattr(fd, &Opt);

  for ( i= ;  i < sizeof(speed_arr) / sizeof(int);  i++)

   {

       if  (speed == name_arr[i])

       {

           tcflush(fd, TCIOFLUSH);

    /*  设置串口的波特率 */

        cfsetispeed(&Opt, speed_arr[i]);

        cfsetospeed(&Opt, speed_arr[i]);

        status = tcsetattr(fd, TCSANOW, &Opt);

        if  (status != )

            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)  !=  )

      {

      perror("SetupSerial 1");

      return(FALSE);

  }

  options.c_cflag &= ~CSIZE;

  switch (databits) /*设置数据位数*/

  {

      case :

          options.c_cflag |= CS7;

          break;

      case :

        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 */

        options.c_iflag &= ~(ICRNL|IGNCR);

        options.c_lflag &= ~(ICANON );

        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 :

          options.c_cflag &= ~CSTOPB;

        break;

    case :

        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] = ; // 15 seconds

    options.c_cc[VMIN] = ;

  tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */

  if (tcsetattr(fd,TCSANOW,&options) != )

      {

          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)

        { /*设置数据位数*/

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

            return -;

        }

    else

    return fd;

}

/**

*@breif     main()

*/

int main(int argc, char **argv)

{

  int fd;

  int nread;

  char buff[];

  //char *dev ="/dev/ttySAC1";

   int i=;

   const char* dev   = NULL;

   const char* string   = NULL;

   const char* type = NULL;

    dev   = argv[];

    string = argv[];

    type = argv[];

    if(dev==NULL)

    {

      printf("Please input seria device name ,for exmaple /dev/ttyO1.\nNote:This is loop test application. Make sure that your serial is loop\n");

      return ;

    }

    /*  打开串口 */

    fd = OpenDev(dev);

    if (fd>)

        set_speed(fd,); //设置波特率

    else

    {

    printf("Can't Open Serial Port!\n");

    exit();

    }

      if (set_Parity(fd,,,'N')== FALSE)  //设置传递参数

      {

        printf("Set Parity Error\n");

        exit();

      }    

    printf("\nWelcome to TTYtest type:%s\n",type);    

      while()

      {        

        if(strcmp(type,"") == ){

        if ((nread = read(fd, buff, ))>)

               {

               printf("\nLen %d\n", nread);

                buff[nread+] = '\0';

               printf("read %s\n", buff);

               }

        }

        else{

            write(fd, string, strlen(string));

            printf("Send test data------%s\n",string);  

        }

        sleep();

         }

}