Dead GPS-RTK2 Board - ZED-F9P (Qwiic) ?

GPS/GNSS Development Boards
1

Hi!

I’m using a GPS-RTK2 Board - ZED-F9P (Qwiic) since a few months, and it was working correctly. But since today, every time I power it up, the led “power” “pps” and “fence” stay on and I don’t receive any data from the uart. When I connect it with Usb, Windows says “unknown peripheral, Device Descriptor Request Failed”

I can get some information if I send 0x55 0x55 to it (via uart1) and connect it to u-center, and I can flash it successfuly, but after a power cycle, I encouter the same problem.

The F9P seems to be always in safeboot even though the safe pin isn’t connected to GND. There is no internal shortcut between safeboot and gnd.

A visual inspection shows nothing strange.

Is there a way to “unbrick” it ?

2

Hi Stephane.

Have you tried connecting it to an Arduino via I2C and running the FactoryDefault_I2C sketch? That should bring the GPS back to life. Failing that, there’s a ‘Default Config’ button in U-Center you might try that should set the GPS back to factory defaults over USB.

3

Hi TS-Chris!

I can run the FactoryDefault_I2C sketch successfuly, but I still don’t receive any byte when I run Example14_DebugOutput sketch.

Same behaviour after I connect the reset pin to GND.

I can’t connect the F9P over USB anymore (Device Descriptor Request Failed)

When I connect the F9P with an uart/usb adapter, then connect the F9P to U-Center, I can get some informations like these :

Software version: ROM BOOT 1.02 (a11814)

Hardware version: 00190000

Extensions: PROTVER=26.00 - MOD=ZED-F9P

There are some informations available on this screenshot, safeboot is always active:

zed-F9P.png

4

Hi!

The F9P stayed unpowered for 3 days. Yesterday I powered it up and… the F9P started correctly. That’s weird!!

I have used it this morning and everything was ok.

But, since 1 hour, the problem is back. I can’t use it anymore. :cry:

5

Hi Stephane.

That’s very odd and not something I’ve seen before.

Can you PM me with your order details? (Order or invoice number)

6

Hi!

Some news:

I had this problem 1 or 2 more times. Each time, the F9P was restarting correctly if I waited a few hours before powering it up.

Since then, I think I found the culprit:

I had inserted a simple switch on the vcc line to power it off. But I noticed that with the F9P off, some leds were still a little powered.

Now the switch is on the GND line and I didn’t have any problem.