From: "Peter L. Peres" <plp@ACTCOM.CO.IL>


> On Mon, 17 Feb 2003, michael brown wrote:
>
> *>I'm somewhat stumped as to how best to do this, since rising/falling
> *>edges occur in the middle of the data bits.
>
> So you detect each bit half a bit late. Why is this hard ?

Half bit late, half bit early, either way that's not too hard using a
timer and hard delays.  I was just looking for a way to do it using the
capture mode of the capture/compare module and reading data on the
edges.  The problem with hard delays is the signal varies quite a bit
between controllers.  I suppose that I could use the first two bits to
"get a feel" for the pulse length and then set the timer delays
accordingly to sample the data accurately, but I'm trying to become a
Zen master of capture mode.  ;-)

I've now switched to a Sony remote that uses PWM instead of RC-5
encoding.  The capture mode works well with this scheme.  I just thought
that maybe someone knew of a clever way to measure the biphase pulse
widths and then divine the data out of it.

michael

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