[linux-dvb] Re: Could the firmware of the DVB-Nexus card supportthe extended RC-5 protocol for the internal IR-receiver?

[Holger Waechtler <holger@convergence.de>]

Uwe Glaessner wrote:
> Hello all,
>
> last week I asked the question in the VDR list if the
> built-in IR receiver of the Nexus DVB card is able to
> understand the new extended RC-5 protocol.
>
> The old protocol consists of 14 bits: 
> 2 start-bits (always equal to 1)
> 1 Toggle-bit
> 5 Addressbits
> 6 Commandbits
>
> Recently Philips extended this protocol to use the
> second start bit as inverted 7th comand bit leading
> to an additional set of 64 commands which are used
> in modern RC-5 remote controls.
>
> Unfortunately the DVB firmware only passes the last
> 12 bits to the driver, so that these extended commands
> do not even reach the driver.
>
> Would it be possible to modify the firmware so that
> 13 or 14 bits are transfered? This way only a slight
> modification of the DVB driver would be necessary to
> support the new RC-5 codes as well.
This would require deeper changes, right now the start bits are used for 
synchronisation of the IR command parser. Since this part of the chip is 
pretty poorly documented I can't really imagine that anybody will do 
this just for fun...

Holger



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