Not got the pinouts to hand, but:

- We will be supplying an extension with the tuner module, I believe.
- The tuner output signals are AM AF/FM multiplex/I2S data (one wire), Signal strength/I2S clock, and I2S wordselect (I have probably got the I2S stuff attributed to the wrong pins; this is from memory).
- Tuner control is over a TTL RS232 link, bidirectionally. The tuner runs the interface at 19200bps, but the port will run up to 230400bps as with other serial ports. It's ttyS1.

FM left/right/RDS all come together in the FM MPX signal. RDS is demodulated by the DSP, not the tuner module. If you want to decode RDS with something other than an empeg you'll need an RDS demodulator chip and some software to extract & error-correct the packets - a lot of this is in the kernel source we ship.

The protocol is nothing special, variable length commands and fixed length responses (as the tuner doesn't have a lot to say - just things like antenna compensation curves, sony stalk commands & that sort of thing). There's a PIC16C73 on the tuner running at 3.6864MHz.

Hugo