On Tue, Feb 08, 2011 at 05:32:50PM +0100, Arvid Brodin wrote: > Hi! > > I get weird problems when I use a null modem cable between the two ports > on a FT232BM (2-port FTDI USB-to-serial converter) with an isp1761 host > controller. The same thing does not happen with an EHCI host controller. > Lengthy details follows: > > With the EHCI host controller: > ============================= > > [Terminal 1] > $ cat /dev/ttyUSB1 > > [Terminal 2] > $ echo "Something seems wrong here" > /dev/ttyUSB0 > $ echo "Something seems wrong here" > /dev/ttyUSB0 Ick, stop right there, that's your problem. Do not rely on 'cat' and 'echo' to get the line settings correct at all. Use a serial program like minicom to test usb to serial ports properly. Yes, sometimes you can get cat and echo to work right, if you use stty to set up everything properly but note that some usb to serial drivers like to reset some of these settings when you close and open the connection, making stty pretty much useless for stuff like 'cat' and 'echo'. It looks like all of your issues are with the line settings for the serial port (line ends, etc.) and should go away if you use minicom. If your problem persists with minicom or some program like that which properly sets the tty settings before transferring the data, please let us know. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
