Julian -- Julian Back wrote: > I have been testing the g_serial serial gadget with my superh_udc driver > on the 2.4.21 kernel. It works when I send data from the host to the > device but when I send from the device to the host I get extra characters. > > Example: > > device# echo 1234 >/dev/ttygs0 > > host# cat /dev/usb/tts/0 > 1234 > 1^^^^^ > > I don't think these extra characters are being introduced by the UDC > driver, they seem to be being sent by the g_serial driver, possibly due > to some problem with line discipline in the tty driver. Here is some > debug output, I can see the 1234 followed by CR/LF being sent but then > gs_put_char gets called with the extra characters. There also seems to > be a timing issue as when I have really verbose debug the extra > characters carry on forever.
Be sure echo is turned off, use "stty -echo < /dev/ttyUSB0" on the host side and "stty -echo < /dev/ttygs0" on the device side. (The device names may not be quite right, I don't have time right now to check.) I have seen similar symptoms caused by each side echoing characters bounce back and forth. I will try to look into this more, but the echo problem is my first guess. -- Al ------------------------------------------------------- This SF.Net email sponsored by: ApacheCon 2003, 16-19 November in Las Vegas. Learn firsthand the latest developments in Apache, PHP, Perl, XML, Java, MySQL, WebDAV, and more! http://www.apachecon.com/ _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
