Em 19-09-2011 08:12, Lawrence Rust escreveu:
> The current decoder for the RC6 IR protocol supports mode 0 (16 bit) and
> mode 6A. In mode 6A the decoder supports either 32-bit data (for
> Microsoft's MCE RC) or 24 bit.
>
> I would like to support a Sky/Sky+ standard RC which transmits RC6-6-20
> i.e. 20 bit data. The transmitted frame format is identical to the 24
> bit form so I'm curious as to what remotes transmit 24 bit data or was
> this an error and it should be 20?
>
> RC6-6-20 is explained here:
> http://www.guiott.com/wrc/RC6-6.html
>
> If 24-bit mode is in use, is there a way to select between 20 and 24 bit
> operation?
You'll need to figure out a way to detect between them. It is probably not
hard to detect, and add support for both at the decider.
Maybe you can find something useful here:
http://www.sbprojects.com/knowledge/ir/rc6.php
>
> I made the following simple mod to ir-rc6-decoder.c and my Sky/Sky+ RCs
> decode correctly (with a custom keytable):
>
> --- a/drivers/media/rc/ir-rc6-decoder.c 2011-05-19 06:06:34.000000000
> +0200
> +++ b/drivers/media/rc/ir-rc6-decoder.c 2011-09-19 13:02:35.000000000
> +0200
> @@ -17,14 +17,14 @@
> /*
> * This decoder currently supports:
> * RC6-0-16 (standard toggle bit in header)
> - * RC6-6A-24 (no toggle bit)
> + * RC6-6A-20 (no toggle bit)
> * RC6-6A-32 (MCE version with toggle bit in body)
> */
>
> #define RC6_UNIT 444444 /* us */
> #define RC6_HEADER_NBITS 4 /* not including toggle bit */
> #define RC6_0_NBITS 16
> -#define RC6_6A_SMALL_NBITS 24
> +#define RC6_6A_SMALL_NBITS 20
> #define RC6_6A_LARGE_NBITS 32
> #define RC6_PREFIX_PULSE (6 * RC6_UNIT)
> #define RC6_PREFIX_SPACE (2 * RC6_UNIT)
> @@ -231,7 +231,7 @@ again:
> scancode = data->body & ~RC6_6A_MCE_TOGGLE_MASK;
> } else {
> toggle = 0;
> - scancode = data->body & 0xffffff;
> + scancode = data->body;
> }
>
> IR_dprintk(1, "RC6(6A) scancode 0x%08x (toggle: %u)\n",
>
>
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