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.
# echo 1234 >/dev/ttygs0 gs_open: (0,8ce7d000,8c1027b0) gs_open: (0,8ce7d000,8c1027b0) completed gs_ioctl: (0,8ce7d000,8c1027b0) cmd=0x5401, arg=2080374064 gs_write_room: (0,8ce7d000) room=8191 gs_flush_chars: (0,8ce7d000) gs_write: (0,8ce7d000) writing 4 bytes gs_send_packet: size=4, 31 gs_write: (0,8ce7d000) wrote 4 bytes gs_write_room: (0,8ce7d000) room=8191 gs_put_char: 0D gs_put_char: 0A gs_flush_chars: (0,8ce7d000) gs_write_room: (0,8ce7d000) room=8189 gs_put_char: 31 gs_flush_chars: (0,8ce7d000) gs_send_packet: size=3, 0D gs_write_room: (0,8ce7d000) room=8191 gs_put_char: 5E gs_flush_chars: (0,8ce7d000) gs_send_packet: size=1, 5E gs_write_room: (0,8ce7d000) room=8191 gs_put_char: 5E gs_flush_chars: (0,8ce7d000) gs_send_packet: size=1, 5E gs_write_room: (0,8ce7d000) room=8191 gs_put_char: 5E gs_flush_chars: (0,8ce7d000) gs_send_packet: size=1, 5E gs_write_room: (0,8ce7d000) room=8191 gs_put_char: 5E gs_flush_chars: (0,8ce7d000) gs_send_packet: size=1, 5E gs_write_room: (0,8ce7d000) room=8191 gs_put_char: 5E gs_flush_chars: (0,8ce7d000) gs_send_packet: size=1, 5E gs_close: (0,8ce7d000,8c1027b0) #
I wonder if anyone else has seen anything similar on another platform with another UDC driver?
Thanks
Julian
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