Mauro Carvalho Chehab wrote: > Andy Walls wrote: >> I have an RC-5 decoder in cx23885-input.c that isn't as clean as the NEC >> protocol decoder I developed. The cx23885-input.c RC-5 decoder is not a >> very explicit state machine however (it is a bit hack-ish). > > The state machine seems to be working fine with the code, but I think I > found the issue: it was expecting 14 bits after the start+toggle bits, instead > of a total of 14 bits. I'll fix it. I'll probably end by simplifying it to > have > only 3 states: inactive, mark-space and trailer.
Done. I've re-written the state machine logic. The code is now simpler to understand, require less processing and works properly with RC-5. Instead of generating an intermediate code, like the code in ir-functions, it measures directly the length of each pulse or space event and generate the corresponding bit directly, putting it into a shift register. At the end of the 14 bits reception, the shift register will contain the scancode. When compared with saa7134 original RC5 decoder, this code is much more reliable, since it doesn't propagate the errors, if the frequency is not precisely 36 kHz. I tested here with my device and it is properly recognizing the Hauppauge Grey IR keys. Both NEC and RC-5 decoders can run in parallel. The patch here: http://git.linuxtv.org/mchehab/ir.git?a=commitdiff;h=37b215ea1280a621d652469cd35328a208f8ef77 And the complete code: http://git.linuxtv.org/mchehab/ir.git?a=blob;f=drivers/media/IR/ir-rc5-decoder.c;h=a62277b625a8ed78028e7060a677598eeae03ffe;hb=37b215ea1280a621d652469cd35328a208f8ef77 I'll likely send an email to the ML with the RC patches that are on my experimental tree, to properly document, and merge it at the -git, together with the other pending requests. -- Cheers, Mauro -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
