LoRaWAN-Signal-Mapping/iot/main/storage.cpp

#include <Arduino.h>
#include <SD.h>
#include <TinyGPS++.h>

#include "settings.h"

void store_init() {
	// NOTE: If this doesn't work, then we need to use pinMode() & specify the data pin here instead.
	if(!SD.begin(PIN_SD_SPI_CHIP_SELECT)) {
		Serial.println(F("Error: Failed to initialise connection to microSD card"));
		while(true) { delay(1); } // Pseudo-halt, but uses delay() to ensure we keep passing back control to allow easy re-programming
	}
}

void store_reading(uint32_t id, TinyGPSLocation location) {
	// Open the file to  write the data to. If it doesn't exist it will be created.
	// Unlike elsewhere, FILE_WRITE opens the file with the cursor starting at the end, so it's basically actually equivalent to FILE_APPEND that we use in other environments. Confusing, I know.
	File handle = SD.open(SD_FILENAME, FILE_WRITE);
	
	handle.print(id);
	handle.print("\t");
	
	handle.print(location.lat());
	handle.print("\t");
	
	handle.print(location.lng());
	handle.println();
	
	handle.close();
}

void store_close() {
	SD.end();
}