[linux-dvb] Re: Budget IR remote clash

[Ed Wildgoose <lists@wildgooses.com>]

Robert Schlabbach wrote:

> From: "Ed Wildgoose" <lists@wildgooses.com>
>  
> > Just from eyeballing the code I suspect that this line:
> > unsigned int code = budget_debiread4(saa, DEBINOSWAP, 0x1234, 2) >> 8;
> >
> > ...in msp430_ir_interrupt is the one responsible for throwing away the
> > extra useful bits.  Presumably masking it off instead of simply loosing
> > the bits will fix the issue.
> >    
> That's incorrect. There _are_ only 8 bits delivered by the MSP430, and
> there is no way to get at any more information.
>
> Explanation: The 16-bit DEBI bus on the budget cards is used for two
> things - Common Interface and IR. The Common Interface only uses 8 bit
> transfers. The MSP430 is simply wired to the upper 8 data lines of the DEBI
> and does not care about the address. When you do a 16-bit DEBI read, the
> upper 8 bits will come from the MSP430, while the lower 8 bits come from
> the Common Interface.
>
>  
> > Before I dive in, has anyone looked into this, and are there any
> > pitfalls to beware of?
> >    
> There's nothing more to the IR than what's already there: 8 data bits and
> GPIO3 to trigger an interrupt when IR data has been received - that's it.
> If you want to do something beyond that, you could try reading the MSP430's
> code via that JTAG connector on the board, disassembling and modifying it
> and reprogramming the MSP430... :-)
>
>  
Hmm, so to be clear - do you think that there is no way to tweak the 
driver to distinguish between my two remote controls?  It's not obvious 
that it is actually using the full 8 bits anyway.  How many "bits" is 
the IR signal producing anyway...?

I also have a full featured DVB-T 1.2 card - I seem to remember that has 
a remote interface as well - anyone know if this works any better...?  I 
rather like the way the DVB IR talks direct to input layer, saves the 
need to invoke LIRC for most things - would prefer to avoid building a 
full lirc receiver...

Thanks Robert

Ed W



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