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FONA 3G is stuck in GPS test mode
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FONA 3G is stuck in GPS test mode

by Fruxic on Mon Jan 04, 2021 7:30 am

Hello,
I'm currently working on the SIM5320E FONA 3G module from Adafruit for a project of mine. I wanted to test the GPS on the module, after resetting it it got stuck in a GPS test mode loop. The FONA now only keeps sending GPS data in NMEA-0183 every second through the UART port and doesn't react to any commands. I tried to communicate with it via a USB to Uart translator and even a Arduino UNO, but it still doesn't react to anything. I also tried to tie the RST pin to ground for a hard reset, but that doesn't seem to work aswell. It keeps sending the GPS data.
Can someone explain how I can get out of this, I would really appreciate.

Fruxic
 
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Re: FONA 3G is stuck in GPS test mode

by Fruxic on Mon Jan 04, 2021 9:24 am

This is what I keep getting from the FONA

Screenshot (4).png
Screenshot (4).png (71.55 KiB) Viewed 119 times

Fruxic
 
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Re: FONA 3G is stuck in GPS test mode

by rskup on Mon Jan 04, 2021 11:30 pm

This may not help, but I noticed in the big SIM5320 manual there is a "GPS automatic" command, see pages 513-514:

https://simcom.ee/documents/SIM5320/SIM ... _V2.05.pdf

Maybe somehow it's toggled to "1", automatic, and that's why you're back to GPS stuff after a reset.

Maybe you can try sending AT+CGPSAUTO=0, and then try another reset?

rskup
 
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Re: FONA 3G is stuck in GPS test mode

by Fruxic on Tue Jan 05, 2021 11:42 am

That didn't work, thankyou for your help tho.

Fruxic
 
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Re: FONA 3G is stuck in GPS test mode

by adafruit_support_mike on Tue Jan 05, 2021 1:16 pm

When you connect to the USB port, does it create the four different COM ports as shown in this part of the tutorial?

https://learn.adafruit.com/adafruit-fon ... connection

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Re: FONA 3G is stuck in GPS test mode

by Fruxic on Tue Jan 05, 2021 1:37 pm

It doesn't create 4 different com port, but 5 unknown com ports as shown below.
Screenshot (6).png
Screenshot (6).png (47.23 KiB) Viewed 96 times

I tried to install the drivers so that's why the top 2 doesn't have a warning sign. When I tried to install the driver I get this message
Screenshot (8).png
Screenshot (8).png (25.17 KiB) Viewed 96 times

Does this mean anything??

Fruxic
 
Posts: 5
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Re: FONA 3G is stuck in GPS test mode

by Fruxic on Tue Jan 05, 2021 3:15 pm

So I have managed to install the correct drivers and was able to communicate via the usb port. I have stopped the GPS auto function and now it doesn't keep sending gps data. I also factory reset the FONA with "ATZ" and then tied the RST pin to ground to restart it.
Sadly another problem came, now I can only communicate via the usb port instead of the uart port. I thought it had something to do with the baudrate in which the FONA is configured so I tried to use the FONA3G_baud example from adafruit to configure the correct baud, but sadly it doesn't react to the example code.
has this something to do with the drivers?

Fruxic
 
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Re: FONA 3G is stuck in GPS test mode

by adafruit_support_mike on Thu Jan 07, 2021 6:13 pm

It might be related to the drivers. Go ahead and uninstall them if you don't need to shut off the GPS any more.

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