[Pd] Serial port out

[Chuckk Hubbard]

With the ratios of on and off bits, though, wouldn't it be possible to
use, say, 512 bytes per value?  I don't understand how the start and
end bits work, exactly.
I happen to have a HIN232:
http://www.hobbyengineering.com/H1345.html
Although I'm guessing that it will be simpler without the extra volts.

Baud rate is something I don't understand too.  Would a super-high
baud rate minimalize the effects of the start/end bits?

ANYWAY, I'm still not sure how to use the [comport] object.  I tried
the help patch, but I don't know how to test it.


-Chuckk


On 11/6/06, Martin Peach <martin.peach at sympatico.ca> wrote:
> Chuckk Hubbard wrote:
> > I'm going forward with this Moog-controlling plan.
> > I have Pd on my laptop, and have compiled [comport].  I'm not sure how
> > to use it, though.  As with so many things, most of the info I can
> > find online tells me way more than what I want.
> >
> > What I want:
> > Is it possible to send constant values OR individual bits to the
> > serial port, as opposed to bytes separated by on/off bits?  How can I
> > set up the timing on this to send controllable PWM?
> > Will it be possible to send PWM from comport with -noaudio?
> You can toggle the handshaking lines at high speed but you will run into
> the jitter caused by pd's audio block size. Or you could send data
> through the serial port with different ratios of on and off bits, but
> you will only get 8 different levels. I think you need to put a serial
> dac there. It's possible to clock serial data into a dac using just the
> handshaking lines -- one serves as a clock and the other data.
>
> Martin
>


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