LC76GAB reset traces

IoT Modules GNSS Module
1

I am working with the LC76GAB GNSS module and encountering an issue where the chip constantly restarts immediately after receiving/outputting the $GNRMC frame.

  • GNRMC Data: Valid (fix status A).

  • 1PPS Output: Working correctly.

  • Issue: Right after the $GNRMC line is transmitted, the module drops into the bootloader and outputs the chip start sequence again (boot loop).

Example log output:

$GNRMC,124434.600,A,3722.727849,N,00600.451487,W,0.12,077.09,060826,,,A,V*14\r\n$$$$$0 0001\n\rT0: 0000 00A6\n\rLeaving the BROM\n\r\n\r[Bootloader] bl_uart_init done\r\nset CP10 and CP11 Full Access \r\n[CLK] Dyna....

Has anyone experienced this behavior?

2

Hi @JGora88 Do you mind sharing the test setup photos, Firmware version and full NMEA logs for further understanding? was the setup you have currently is a custom PCB design?

Best regards,

3

Mystery solved! The issue was that my serial port flushing routine was failing. As a result, the initialization traces remained in memory.

Best regards.

4

Hi @JGora88 Glad to hear that it has been solved. If you have other question, feel free to ask and will assist you on the matter. Best regards.