GNSS not responding on commands or send NMEA sentences

[drucknase]

Hardware

• [ ] Standalone
• [ ] Badge
• [ ] Prime Mark II
• [x] Dongle
• [ ] SkyView EZ
• [ ] Uni
• [ ] Mini
• [ ] Academy
• [ ] Lego
• [ ] ES Edition
• [ ] Balkan
• [ ] Raspberry Edition
• [ ] UAV
• [ ] WebTop Serial
• [ ] WebTop USB
• [ ] UAT978 module
• [ ] Flight Recorder

Firmware version

`SoftRF-STM32 FW.REV: 1.3 DEV.ID: 3a4e074c Copyright (C) 2015-2023 Linar Yusupov. All rights reserved.

Reset reason: 6 EXT_SYS Free heap size: 6276 No reset information available

WARNING! User defined settings are not initialized yet. Loading defaults... SX127x RFIC is detected. WARNING! Barometric pressure sensor is NOT detected.

TTGO T-Motion (S76G) Power-on Self Test

Built-in components: RADIO : PASS CLK SRC : TCXO GNSS : FAIL

External components: DISPLAY : N/A BMx280 : N/A

Power-on Self Test is complete.

Data output device(s): NMEA - USB CDC GDL90 - NULL D1090 - NULL

$PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3444 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3444 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3444 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3444 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3444 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3444 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3444 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3444 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3444 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3747 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3747 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3747 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3747 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3747 $PFLAU,0,0,0,1,0,,0,,,4F $PSRFH,4E074C,1,0,0,3444 $PFLAU,0,0,0,1,0,,0,,,*4F `

Firmware settings

just after flashing software (required)

Describe the bug

the GNSS does not respond to commands. I tried also with own software, so after sending a command via serial interface, the GNSS chip (CXD5603) dows not respond. No NMEA output. Only 1 sec impuls can be observed on PB5. Didn't find the same problem in the closed issues

To Reproduce

I have two out of five T-Motion boards which show the same behavior.

Expected behavior

get respond from GNSS chip including NMEA sentences

[lyusupov]

• anonymous user
• your boot log contains the following message:

Built-in components:
RADIO : PASS
CLK SRC : TCXO
GNSS : FAIL

which is clear indication that your GNSS issue has nothing to do with the SoftRF firmware. Read the Disclaimer against hardware issues then go work with your seller / supplier.

Resolution: invalid