Hi,
I'm using Kernel 2.6.19.2 and Litekit 1006581 REV2. I'm tring to use the debug port to communicate with a serial device (RS485). Fist I configured my bootloader to use the ttymxc2 as a console port and let the ttymxc0 free for my use (I can acess Linux by Telnet).
In my Linux program I open the Ttymxc0 and I can write and read the serial port without problems, but I neet to use the hardware control pins RTS/CTS and this pins are not working.

I try to configure the serial port to use Hardware Flow control and I try to use de "ioctl" function and neither of them works !!!


Here is a part of my code:

//********************************************************************************************
//***************** Here I open the TTYMXC0 *****************************************
//********************************************************************************************
TtyUbus = open( "/dev/ttymxc0", O_RDWR | O_NONBLOCK | O_NDELAY | O_NOCTTY);// Open the tty
if (TtyUbus == -1){
printf( "Error, unable to open port\n" );
return -1;
}
tcgetattr( TtyUbus, &termOptions );
cfsetispeed( &termOptions, B19200 );
cfsetospeed( &termOptions, B19200 );
termOptions.c_oflag |= (BRKINT | IGNPAR); //( testar IXANY)
termOptions.c_oflag &= ~(OPOST | OLCUC | ONLCR | OCRNL | ONOCR | ONLRET | OFILL | OFDEL | NLDLY |CRDLY | TABDLY | BSDLY| VTDLY| FFDLY);
termOptions.c_iflag |= (BRKINT | IGNPAR);
termOptions.c_iflag &= ~(IGNBRK | INPCK | ISTRIP | INLCR | IGNCR | ICRNL | IUCLC | IXON | IXANY | IXOFF |IMAXBEL);
termOptions.c_cflag |= ( CLOCAL|CREAD );
termOptions.c_cflag |= PARENB;
termOptions.c_cflag &= ~CSTOPB;
termOptions.c_cflag &= ~CSIZE;
termOptions.c_cflag |= CS8;
//termOptions.c_cflag |= CRTSCTS;
termOptions.c_cflag &= ~CRTSCTS;
termOptions.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
// Set the new options for the port
tcsetattr(TtyUbus, TCSANOW, &termOptions);



//********************************************************************************************
//***************** In this other part, I just change the state of RTS *************************
//********************************************************************************************
While(1)
{
ioctl(TtyUbus, TIOCMGET, &flags );

flags &= ~TIOCM_RTS;
flags &= ~TIOCM_DTR;
ioctl(TtyUbus,TIOCMSET,&flags);
Lost_some_time();

flags |= TIOCM_RTS;
flags |= TIOCM_DTR;
ioctl(TtyUbus,TIOCMSET,&flags);
Lost_some_time();
write(TtyUbus,"Test Uart\r\n",11);
}

Somebody knows if there is a hartdware problem with this pins or if I'm making something wrong?

Thanks,
SB