28 May
2021
28 May
'21
11:29 a.m.
Hi Harald,
On 5/28/21 11:15 AM, Harald Welte wrote:
Hi Katharina,
thanks for your follow-up.
Can you please share which phone / modem models you have reproduced this with?
I am
testing with a OnePlus 6T with a Qualcomm SDM845 Snapdragon 845
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:
I think this already is a good
explanation: The Wiki reads like pin 5
*is* the RX of the simtrace, but looking at the documentation above it
*should be connected to* the RX of the UART adapter. I can clarify that
in the Wiki.
Best,
Katharina
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?