FCDEV3B bring-up status

Serg l serg at tvman.us
Mon Apr 10 16:57:48 UTC 2017

This is really good that you confirmed RF circuit functionality to some
I remember that you were talking about calibration procedures, could you
remind me where in the available docs and codebase we have the calibration
table values defined/described? Just trying not to duplicate the research
effort :) Maybe I could use some alternative tools than CMU200.

On Sun, Apr 9, 2017 at 3:59 AM, Mychaela Falconia <
mychaela.falconia at gmail.com> wrote:

> Hello again everyone,
> Just to assure myself that the RF tract on our FCDEV3B is fine in
> hardware terms and that our only problem in this regard is the lack of
> VCXO calibration, I have run OsmocomBB's full mobile app with their
> layer1 running on our FCDEV3B, with a real SIM in the SIM socket on
> our board, and it works: I was able to connect to my local GSM network
> (Operator 310260), and send and receive SMS successfully.  I have also
> succeeded in dialing and connecting a voice call, although I couldn't
> test the voice path as the off-board loudspeaker and microphone have
> not been added yet.
> When it comes to audio, I designed the FCDEV3B with the intent of being
> able to make test calls from the lab bench without needing anything
> except the board itself, and for this purpose there is a loudspeaker
> driver circuit and a microphone input circuit on the board.  However,
> the actual loudspeaker and microphone themselves aren't on the board,
> instead there are headers meant for connecting them.  At some point I
> will need to acquire some loudspeaker and microphone parts, wire them
> up to the headers and test these on-board audio circuits, but right
> now there are higher priorities.
> For me the bring-up priorities going forward are as follows:
> 1. Get to the bottom of the flash boot mystery.  We are not OsmocomBB
> and our firmware is meant to run from flash, hence the flash boot
> problem needs to be solved before I will feel comfortable taking on
> other major challenges like calibration.  In order to gather more
> insight into this flash boot mystery, I need to connect JTAG to our
> board, and I am currently missing the necessary jumper wires.  I need
> jumper wires like these:
> http://www.ebay.com/itm/262158878688?_trksid=p2057872.
> m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
> I already placed the order for the above back on Wednesday, but the
> seller warns that they may take a month to arrive.  In the next few
> days I will see if I can procure similar jumper wires more locally.
> 2. Climb the calibration learning curve and get our FCDEV3B's VCXO
> calibrated on the CMU200 so we can bring up the GSM radio using our
> preferred firmware, rather than OsmocomBB.
> Hasta la Victoria, Siempre,
> Mychaela aka The Mother
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