Request for Assistance with Missing Headers in Firmware-Basic

The gpsInterface.h file defines the following external functions that are called by code within gpsInterface.c and are intended to be handled by the application code.

In the AudioMoth-Firmware-Basic code these functions are implemented within the gps.c file. When you build the AudioMoth-Firmware-Basic the linker compiles gps.c and finds these functions. The error message you are seeing is the linker complaining that it has no function implementation for GPSInterface_handleReceivedByte. This is most likely because gps.c is not in the source folder. If you don't use gps.c you don't need to include the /gps/src/ and /gps/inc/ folders in the build instructions in the MakeFile. However, if you include the  /gps/src/ and /gps/inc/ folders, and don't include gps.c, you will get this error. If you really don't need gps.c, you can prevent the error by adding empty function definitions into the main.c file:

void GPSInterface_handlePulsePerSecond(uint32_t counter, uint32_t counterPeriod, uint32_t counterFrequency) { }

void GPSInterface_handleReceivedByte(uint8_t byte) { }

void GPSInterface_handleTick(void) { }

This is why the default main.c file in the AudioMoth-Project code has empty function implementations for lots of other interrupt handlers. These function implementations are needed to satisfy the linker since they are called by other code. However, they don't need to do anything within the default application.