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 _______________________________________________ Xastir mailing list [email protected] http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir
