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Sylvain Munaut 246tnt at gmail.comHi,
> then I have put a diode between TXD and RXD, then I have connected RXD to
> I/O of phone sim slot,
I'm not sure a diode would help here at all ...
Usual solution is to have an open collector output with a pullup.
Then you have all the issue where a phone could request change of
speed via the special PPS procedure (IIRC) and I'm not sure you'd be
able todetect and follow it.
Adapting the fw of a simtrace board seems like a better solution.
Cheers,
Sylvain