Recent content by djkoshea

All the bits inside are marked "FMS audio" if that means anything to anybody... David.

Ah, proper oscilloscope software, cool! This looks a bit different - on the radio the low+high timings for each pulse were the same, regardless if they were 0 or 1 - 0 is .5ms low and 2.5ms high whereas 1 is 1.7ms low and 1.3ms high. Here the 1s seem longer. There seems to be a fixed length low...

That looks suspiciously like the nybble before the 1111 is the checksum...

Hi, Hmm, interesting. Strange that the checksum always is 1111. Do you have the codes for all the keys? Even though it's not directly related, I'll add the info to my message decoder page - the more details on this protocol the better! I didn't notice that 9ms/4.45ms pulse in my system, but...

Hi, I've been playing with the factory Mazda 3 head unit and I've discovered some interesting things about the protocol that it uses to communicate between the various modules. The eventual plan is to connect an old laptop up and have it controlled from the radio controls, display text on the...