On 7/27/2011 11:00 AM, Andrew Errington <[email protected]> wrote:
On Tue, 21 Jun 2011 22:54:38 Andrew Errington wrote:
> I am pleased to say that my code for driving PTT with a GPIO pin on a USB
> audio chip has been incorporated into soundmodem v0.16. Currently it
> compiles for CM108 and other C-Media chips, but I have a patch which will
> allow the vendor IDs and product IDs for SSS1621 and SSS1623 audio chips to
> be recognised.
>
> I have tested it with the diagnostic functions (PTT test button) in
> soundmodemconfig, but it should work 'for real'.
I am further pleased to announce that I have successfully sent messages
between two instances of Xastir connected to two instances of soundmodem
connected to two USB audio devices connected to two radios (Yaesu VX2r and
Yaesu FT-7100M). The devices were connected to the same laptop, but they are
conceptually separate. The antennas were only about a metre apart. My test
was brief, but I believe it will work consistently.
I used two USB audio dongles based on SSS1623 with a PTT transistor added. I
discovered that SSS1623 needs a pull-down to stop the transistor being turned
on when the device is plugged in. SSS1623 has a pull-up on GPIO, CM108 has a
pull-down. Grr! Obviously it's not a problem once soundmodem is running.
I also recently bought another USB audio dongle with an epoxy-blobbed chip.
The chip is SSS1623, but the GPIO pins are not bonded out and not
accessible.:(
73,
Andrew
ZL3AME
Andrew, excellent work! Do you remember where you got the USB audio
dongles that had the GPIO pins exposed - non-epoxy blobs? The ones I
have are the SSS1623 die with the epoxy blob. Perhaps only the latest
are the ones with the epoxy blob - cheaper to make.
Dale - KG5LT
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