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Thank you a lot mdavey: do you know if GPIO_GPIO24 is really wired (on serial port on the rear) to RTS according to empegcar.h?
I don't know.
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Also what's the meaning and the levels of "level" and "signal" signals on the radio module?
I'd guess that "level" is either analogue or BCD from the tuner to the DSP to indicate the signal strength so that the DSP can do automatic fine tuning / drift correction and automatic gain control. I'd further guess that "signal" is a serial stream from the tuner to the DSP, containing the FM multiplex - being a combination of the RDS, left and right channels.
This is all pure guess work, however. You'll have to wait until pca reads and replies to this thread to be sure.
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