Hello Pirmin,
On 9/1/22 15:23, Duss Pirmin wrote:
Hello Genodians
In the Release notes, I read that on the Pinephone it is possible to use the Quectel EG25-G in ECM mode to communicate over LTE. Which I find is a really great feature.
We have a hardware (UP-Xtreme i7 8th gen) which comes with the same modem. I really like the idea of using the modem in this way.
As far as I understand, the run script `run/modem_pinephone.run` of the `genode-allwinner` repository does exactly that.
My plan is to create a PC version of `pinephone_modem` that controls the modem. Do you think, this is possible?
It should be possible in general since communication with the modem only uses AT commands.
Currently I do not have a idea what serial port I should use to connect to the command channel of the modem. On the Pinephone, `ns16550_uart` is used to do that.
Which serial port should be used on the PC platform?
I think on the PC the modem will expose USB-Serial ports (ttyUSB<x> and friends). You can try this by connection via a terminal emulator (e.g., picocom, minicom) to it:
! picocom -b 115200 /dev/ttyUSB2
Enter: ! AT
Return: ! OK
If the "AT" command gives you an "OK", you found the correct device. Note the modem exposes four UARTs. If this all is the case, a USB serial driver that exposes a terminal session (like PL2303 [1]) is needed on Genode. I don't know exactly what kind of USB UART adapter the modem exposes right now. Maybe it's already PL2303. I will check.
[1] repos/dde_linux/src/server/usb_terminal
Cheers,
Sebastian
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