Mark Rages wrote:
> There's another option:
> 
> If you transmit continuous 0x00 out of the serial port, there is a
> start bit, 8 low bits, and a stop bit. The start bit is low, the stop
> bit is high.  So 90% of the time, the pin would be low.  (You could
> even do 9-bit transmission, and make that 91% of the time).  Is 91%
> good enough for you?  (Probably not, in a multiplexed LED array.  :( 
> But I'll mention my idea anyway.)

It's a good thought.  I don't know if that 9% error would be noticeable, 
but it seems possible.  There's source around for serial receive, 
though, and that seems a little cleaner (and I have the code space and 
extra processor time).

> PS. I wrote some code to play audio on the TX pin of my PC's serial
> port.  It doesn't sound too bad -- it takes a full ten minutes for the
> headache to start!  Anyway, I'll post it once my blog is back online.

Fun!  I'd be interested to hear what it sounds like (less than ten 
minutes' worth, anyway).

Thanks.
-- 
Timothy J. Weber                 http://www.lightlink.com/tjweber
tjweber@lightlink.com
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