Please keep the USB list on CC. On Fri, Jan 08, 2021 at 08:02:36AM -0600, Joe Abbott wrote: > Thanks for the reply. > > kernel version is 5.0.0-32-generic. I've restored pl2303.ko to original. 5.0 should work as well. > Chip version is PL2303TA. And I believe that one is supposed to be compatible with HXD. > When I loopback rs232 to pc at 150 baud it looks normal. After > setting to 110 baud it returns at a much higher rate and scope trace looks > the same as when set to 9600 baud. > > Setting up debug might be beyond my abilities unless I could find a good > how-to that I could follow. You can either use debugfs: echo module pl2303 +p > /sys/kernel/debug/dynamic_debug/control or provide an argument to modprobe: modprobe pl2303 dyndbg==p Then just check demsg after calling stty (110 evenp). > I'll look into capturing some windows packets at 110 and 9600. Sounds good. Johan
