My LoRaWAN Signal Mapping MSc summer project. This is a copy of the actual repository with personal information removed.
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LoRaWAN-Signal-Mapping/iot/main/storage.cpp

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#include <Arduino.h>
#include <SD.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.longitude());
handle.print("\t");
handle.print(location.latitude());
handle.println();
handle.close();
}
void store_close() {
SD.end();
}