Hello,
I’m developing two separate projects in parallel. Both use the RAK3172 and are programmed via SWD in STM32CubeIDE, but they’re experiencing the same issue.
I’m using UART2 for LoRaWAN debugging and serial output, while I’ve reserved UART1 for GPS (LC86G and LC76G).
I’ve checked the physical connections and even soldered a jumper on the GPS TX line to verify the NMEA output through a TTL converter—and everything works. However, my RAK3172 modules can’t “see” the GPS TX signal (and yes, I did connect TX to RX…). What could be the problem? UART1 isn’t functioning correctly on either board.
It’s important to note that the settings have been reviewed countless times, to the point that they were imported from another working STM32L4 project.
