@revk hey, what's the best way to debug a non responsive GNSS module?
I have red blinking on the ESP side and
E (246281) GPSNTP: GPS Tx $PQBAUD,W,115200
E (247000) GPSNTP: int 9027 tx 0 err 0
output on USB TTY.
The GNSS module lights up green and when I removed the 2032 it measured at 0.7V.
Last sign of life was probably around 12 days ago.
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@revk Thanks for the offer. If it's anything that can be done locally I'd rather avoid your expense.
I will indeed throw a scope / analyzer at it. Can I just hook either side up to a USB2UART? I'll consult the source code and rig up a way to intercept the signals on the link cable.
@tbr The schematic is on codeberg, and should allow you to find a simple test point for tx/rx each end. Assuming not an older model, the tx/rx are then done as RS485 pairs which you can scope and see data patterns as well.
@tbr Also, if you fitted a battery to GPS, remove, and wait a bit, with it all disconnected, then fit battery and reconnect. That will do a reset on the GPS module.
@tbr It could be faulty - sadly it could be faulty GPS, faulty GPSNTP, or iffy cable/connector, so not simple.
I'd show a scope on it myself. But If you would like a replacement, let me know.