[vdr] Re: Not all RC-5 keys are recognized by the Hauppauge Nexus built-in IR-receiver

[bruce14@gmx.net]

> Sorry, if you really want to know whether these keys emit RC5 or not, 
> you have to check the codes with an oscilloscope.
> 
> The firmware should pass all RC5 codes to the driver. If you pass the 
> debug option 'av7110_ir_debug=1' to the driver, you will see every key 
> code which arrives in the driver.

I think I've found the solution (thanks to google ;-)

The old Philips RC5 protocol consists of 14 bits:
2 start-bits (always equal to 1)
1 Toggle-bit
5 Addressbits
6 Commandbits

Apparently Philips recognized that 6 bits are not
sufficient to support complicated devices and 
changed the protocol slightly: The 2nd start-bit
is now used as inverted 7th command-bit. So
for the first 64 commands nothing changes, but
there is now a second set of 64 commands 
available, having the second start bit set to 0.
This exactly explains the codes in the RC-5 
config file from lirg.org.

Is there any chance to enhance the driver to
support the new protocol? (Otherwise I  would
have to dig out my 20 year old soldering iron and
modify my LIRC receiver, a scary thought ;-) 

Best regards
- Uwe Glaessner


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