All those measurements were taken with the circuitry not connected – just the oscilloscope probe straight to the GPIO pins. Though the behavior is the same when it is connected. Not enough voltage is produced to activate the optocoupler, which is how I noticed the problem originally.
I’ll give manually setting the pins a try. Could you point me to where in the code the PTT pin gets set in case I need to tinker with it?
Ultimately the issue was that I wasn’t setting a valid call during setup, looks like the software is checking for a call being set as an indicator of if setup has been run. My application is a GMRS repeater where the users ID but the repeater doesn’t. Putting in a valid call got me past setup, and I was able to switch off both short and long IDs in menus later.
Took a while to come back to this but I’m working at it again. I was able to resolve the no audio passed issue, the sound card was defective and has been replaced.
Unfortunately I am still experiencing the setup loop issue, in Chrome, Firefox and Safari, all with Javascript enabled. Same symptoms as before. Any other ideas for what could be causing that issue? Alternatively is there a way to configure the repeater without using the GUI?
Thanks for the help, I will check out the sound card and see if I get better luck with a different chipset. I do keep Javascript off in both browsers I tried as well so that’s a likely culprit for the web side issues. Will post updates as I make progress.
I have reformatted and re-imaged the SD card with a freshly-downloaded image and the behavior is exactly the same. Now however I can’t even reach the control panel on the first pass through the wizard, just logs me in straight back to step 1.
