On Mon, Dec 12, 2016 at 07:51:59AM -0800, Russell Senior wrote: > On Mon, Dec 12, 2016 at 7:40 AM, Johan Hovold <johan@xxxxxxxxxx> wrote: > > On Mon, Dec 12, 2016 at 07:09:34AM -0800, Russell Senior wrote: > >> On Mon, Dec 12, 2016 at 1:54 AM, Johan Hovold <johan@xxxxxxxxxx> wrote: > >> > >> > Ok, so maybe your device simply does not support changing the line > >> > settings more than once. That is, the initial settings chosen are used > >> > until re-connected. This would seem to be in accordance with a comment > >> > found in one of the out-of-tree drivers floating around (and which at > >> > least I hoped would no longer be an issue with the new way of changing > >> > the settings). > >> > > >> > If you connect the ch340 you have in loopback mode, with the removed > >> > initial LCR write that fixed the 5-bit behaviour, can you get that > >> > behaviour back by setting 5-bit word size after opening the port? (This > >> > was what I was going for with my original question above.). > >> > >> With minicom configured with 5N1 (that is, 5-bit mode), loopback looks > >> normal. I type an 'a' and I get and 'a' back. Likewise, I type an > >> 'A' and I get an 'A' back. I used a saved .minicom.dfl file to > >> configure the port. > > > > Ok, so that seems to confirm the suspicion that changing settings after > > the initial configuration is failing (even though the device does indeed > > support 5-bit mode). > > > > Could you try to verify if that applies to the baud rate as well? That > > is, can you switch between say 9600 and 115200 after opening the port > > and verify that against the pl2303? > > > > Still using usb-linus with the first LCR write removed. > > I can change the baud rate on the ch341 and make it not work with the > pl2303 (e.g. I send an 'A' from the pl2030 and get an 0xff on the > ch341, and vice versa), then harmonize the baud rate again and it > works again. Changing baud rate seems to work. That's good. And just to confirm: you managed to get characters through at both rates? Thanks, Johan -- 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
