[ts-7000] TS7260-Reading from /dev/ttyUSB0

["tsao.terence" <>]

Dear Linux masters,

     I am communicating TS7260 with my sensor device using a USB to serial FTDI 
converter.  The sensor uses the uart interface, and the TS7260 uses the USB 
interface.  The sensor device will send TS7260 a packet of data which contains 
512 bytes, aka each packet is 512 bytes.


I had success reading from ttyUSB0 with 9600 and 38400 baudrate, but when I 
jump to 57600 baud, the program just hangs.  I think there might be something 
wrong as I open the USB port, or my receive function has too much software 
overhead.  Anyone here had success reading from the ttyUSB0 port?

Here is my open USB function:
int openUSB()
{
    int fd = open ("/dev/ttyUSB0", O_RDWR | O_NOCTTY | O_NDELAY | O_FSYNC);
    if (fd==-1)
    {
      fprintf(stderr, "open_port: Unable to open /dev/ttyUSB0 -%s \n",
               strerror(errno));
    }

    struct termios options;

    /*Configure port reading*/
    fcntl (fd, F_SETFL, FNDELAY);
    /*Get the current options for the port*/
    tcgetattr(fd, &options);

    /*Set baudrate to 500000Mb*/
    cfsetispeed(&options, B57600);
    cfsetospeed(&options, B57600);

    /*Mark the character size to 8 bits, no parity*/
    options.c_cflag     |= (CLOCAL | CREAD);
    options.c_lflag     &= ~(ICANON | ECHO | ECHOE | ISIG);
    options.c_oflag     &= ~OPOST;
    options.c_iflag     &= ~(IXON | ICRNL);
    options.c_cc[VMIN]  = 0;
    options.c_cc[VTIME] = 0;
    tcsetattr(fd, TCSANOW, &options);
    return fd;
}

Here is my read function:.
unsigned char receivePacket(int fd, unsigned char *buffer)
{

    unsigned int i=0;
    unsigned int left_to_read=520;
    unsigned char byte;
    while(left_to_read>0)
    {
     unsigned char temp = read(fd, &byte, 1);
     if(temp>0)
     {
      left_to_read--;
      buffer[i]=byte;
      printf("%.2x",byte);
      i++;
     }
    }
    return 0;
}



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