Howdy!
I have an upcoming project which requires a clean square-wave to be generated
anywhere from 1Hz to 9 kHz. My original thought was to use the serial port
of most PalmOS devices, when to my dismay I discovered that 90% of the more
affordable PalmOS devices only had USB, not serial.
Second thought: Use an existing, or develop my own, SDIO card with a single
serial output. Can't find an existing one, and I don't have the upfront coin
to join the SD association, so that thought gets blown out a tailpipe.
Others I have talked to suggest IR-triggered generation, and other even more
fanciful ideas... but I need to generate a continious, smooth square wave, IR
or bluetooth just won't cut it.
An associate of mine has already developed a simiar system for PC serial
ports, but his solution involves massive reprogramming of interrupts, and
hardware control over serial lines.
So I have several questions:
1) Does anyone know how to interface directly with the MAX3386E
RS232-compatible serial driver in the T|T3 (or other handheld chip preferably
in a cheaper model ;) to manipulate specific pins?
2) If not, does anyone know of an existing SDIO solution similar or adaptable
to what I need?
3) Would the audio hardware of, say, the Tungsten|E, or even the Zire 21, be
of high enough quality to generate a smooth (cough) square wave?
4) Might I be able to manipulate the USB data line directly at those
frequencies?
5) Has anyone else developed their own SDIO card? And/or how much do you
charge for your services? ;)
6) Can anyone still get ahold of Visor springboard module housings? If so, I
may be able to use a PIC or programmable frequency generator for my
purposes...
7) Does a handheld exist (i.e. is still being manufactured) that has a similar
programmable interface to the Visor line? If so: links, cost, and expected
lifespan.
Thanks for the help,
Matthew Bevan
--
Matthew Bevan, Margin Software
- Re-inventing the wheel, every time.
FYI - Finagle's fourth Law:
Once a job is fouled up, anything done to improve it only makes it worse.
--
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