Re: [gentoo-user] Struggling with CH340 serial<=>USB converter (Arduino related)

On 07/26 03:50, tuxic@××××××.de wrote:
> On 07/25 02:24, R0b0t1 wrote:
> > On Tue, Jul 25, 2017 at 12:17 PM,  <tuxic@××××××.de> wrote:
> > > Hi,
> > >
> > > (yes, I also have a FTDI USB<=>serial adapter...in this case I need to
> > > get my CH340 based work)
> > >
> > > this drives me crazy...
> > >
> > > My CH340G USB<=>serial adaptor is recognized as
> > > (lsusb)
> > > Bus 007 Device 011: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter
> > > (dmesg)
> > > [52255.016438] usb 7-4: new full-speed USB device number 11 using ohci-pci
> > > [52255.167432] usb 7-4: New USB device found, idVendor=1a86, idProduct=7523
> > > [52255.167439] usb 7-4: New USB device strings: Mfr=0, Product=2, SerialNumber=0
> > > [52255.167443] usb 7-4: Product: USB2.0-Serial
> > > [52255.169580] ch341 7-4:1.0: ch341-uart converter detected
> > > [52255.179543] usb 7-4: ch341-uart converter now attached to ttyUSB3
> > >
> > >
> > > But that's it.
> > >
> > > It does not seem to react on any kind of action I try to achieve with
> > > avrdude (I skipped the arduino IDE to get one variable off this
> > > eqyitation...).
> > >
> > > I instructed avrdude to "speak to the board" like this:
> > > avrdude -p ATmega2560 -c arduino -P /dev/ttyUSB3 -b 9600
> > >
> > > ...but the only reaction I get is ...timeouts...
> > >
> > > I have no clue what to do next.
> > >
> > > How can I devide the things which are working so far from those
> > > which are not working.
> > >
> > > The ATmega2560 board is working - I can flash it via buspirate (ICSP).
> > > I burned a bootloader with that...just to mention...not wanting to
> > > start an Arduino discussion on a Gentoo mailinglist...only to
> > > explain the context a little bit...
> > >
> > > What is the status of the ch340/ch341 driver?
> > > (I am running kernel 4.12.3 vanilla right off Linus desktop so to
> > > say...)
> > >
> > > Thanks a lot for any help in advance!
> > > Cheers
> > > Meino
> > >
> >
> > If the device creates a /dev node there is probably no issue with the
> > driver. The default Arduino speed is now 57,600, are you sure 9,600 is
> > right? Before that it was 38,400. Use the ICSP interface to flash a
> > program that prints things via serial and see if you can receive them.
> > If your serial connection is unreliable you will get garbled
> > characters.
> >
> > Avrdude should eventually time out with a message, what is that message?
> >
> > I have been experiencing similar problems that you have described with
> > various Arduino and Arduino-derived boards and so far have not been
> > able to explain it. Most of the time they work perfectly but some do
> > not and the bootloader seems to refuse to work.
> >
> > R0b0t1.
> >
>
> Hi R0b0t1,
>
> :) thank you very much for your reply! :)
>
> Since it will become nevertheless more Android loaden I will
> respond off list ...
>
> Cheers
> Meino
>

Sorry...not "ANDROID loaden"...it should be "ARDUINO" loaden...
>
>