Cardem under Manjaro/Arch: Some Troubleshooting

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Harald Welte laforge at osmocom.org
Fri May 28 09:15:22 UTC 2021


Hi Katharina,

thanks for your follow-up.

Can you please share which phone / modem models you have reproduced this with?

Maybe I can find the same in my collection.

I will try to run cardem on simtrace on a variety of different phones here and
see which ones work or don't work.

On Wed, May 26, 2021 at 03:03:38PM +0200, Katharina Kohls wrote:
> BTW while debugging this I realized that the pin layout might be documented
> in the wrong order: The wiki says TX is on 4 (pin 1 = GND, pin 4 = TX, pin 5
> = RX), however, for me it only worked when hooking up pin 5 with the RX of
> my UART to USB. Is that a typo?

I've always using the 2.5mm stereo jack, as those are used in a lot of Osmocom projects
starting with OsmocomBB more than a decade ago.

tHe 5-pin UART header was designed to match the FTDI USB-UART cable pin-out.

The schematics are available, they should definitely be the definitive source to
answer those kind of questions.

It states:
1 GND
2 CTS
3 VCC
4 DRXD (SAM3) = TXD of your UART cable
5 DRXD (SAM3) = RXD of your UART
6 CTS

Maybe the wiki could be further clarified?
-- 
- Harald Welte <laforge at osmocom.org>            http://laforge.gnumonks.org/
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