My LoRaWAN Signal Mapping MSc summer project. This is a copy of the actual repository with personal information removed.
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#include <Arduino.h>
#include <SdFat.h>
// #include <ArduinoFiles.h>
#include "settings.h"
#include "gps.h"
// FUTURE: We might be able to trim it down if we disable long filenames with #define USE_LONG_FILE_NAMES 0
SdFat* card = nullptr;
void store_init() {
card = new SdFat();
if(!card->begin(PIN_SPI_CS_SD)) {
Serial.println("Error: MicroSD card init failed");
while(true) delay(100);
void store_reading(uint32_t id, GPSLocation location) {
// Port the rest of this to SdFat from SD
// 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 = card->open(SD_FILENAME, O_APPEND | O_CREAT | O_WRONLY);
char line[33];
int chars = snprintf(line, 33, "%d\t%06d\t%06d\n",
id,, location.lng
handle.write(line, chars);
handle.close(); // Syncs implicitly
void store_debug(char* buffer, int size) {
File handle = card->open(SD_FILENAME_DEBUG, O_APPEND | O_CREAT | O_WRONLY);
handle.write(buffer, size);
void store_end() {
// Apparently we'ree fine so long as we don't have any open file handles - there's no end() method on the SdFat class
// card->end();
delete card;
card = nullptr;