unix - UART 0x0D's becoming 0x0A's -

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the following code configures 2 uart ports on beaglebone black.

// open given file read/write, don't become controlling terminal, don't block     int filedescriptor = open(filename, o_rdwr | o_noctty | o_sync);      if(filedescriptor == -1) {         cerr << "open_port: unable open " << filename << " " << strerror(errno) << endl;         return false;     }      struct termios tty;      memset(&tty, 0, sizeof tty);      if(tcgetattr(filedescriptor, &tty) != 0) {         cerr << strerror(errno) << endl;         return false;     }      // baud     cfsetispeed(&tty, b115200);     cfsetospeed(&tty, b115200);      // 8-bit chars     tty.c_cflag = (tty.c_cflag & ~csize) | cs8;      // disable ignbrk mismatched speed tests; otherwise receive break     // \000 chars     tty.c_iflag &= ~ignbrk;         // disable break processing     tty.c_lflag = 0;                // no signaling chars, no echo      // no canonical processing     tty.c_oflag = 0;                // no remapping, no delays     tty.c_cc[vmin]  = 0;            // read doesn't block     tty.c_cc[vtime] = 5;            // 0.5 seconds read timeout      // shut off xon/xoff ctrl     tty.c_iflag &= ~(ixon | ixoff | ixany);      // ignore modem controls     tty.c_cflag |= (clocal | cread);      // enable reading     tty.c_cflag &= ~(parenb | parodd);      // shut off parity     tty.c_cflag |= 0;     tty.c_cflag &= ~cstopb;     tty.c_cflag &= ~crtscts;      if(tcsetattr(filedescriptor, tcsanow, &tty) != 0) {         cerr << strerror(errno) << endl;         return false;     }

i'm able send data, reason 0x0d's sent received 0x0a's. i'm sure in port configuration doing this.

enter image description here

i notice these 3 flags on man page tcsetattr:

inlcr  translate nl cr on input.  igncr  ignore carriage return on input.  icrnl  translate carriage return newline on input (unless igncr set).

you might want try explicitly setting inlcr , icrnl 0 ?


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