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

[Oliver Endriss <o.endriss@gmx.de>]

bruce14@gmx.net wrote:
> > 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 ;-)

The driver could be easily changed. The question is whether the firmware 
could support 'extended RC5'. Holger?

Oliver


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