Added SD card writes -> Coords are stored as coords[0..].txt

LoRaSender/LoRaSender.ino

@@ -35,7 +35,7 @@
 Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
 TinyGPSPlus gps;
 
-SDHelper logger(SD_CS, FAM_W);
+SDHelper logger;
 
 void sendMessage(const String& msg) {
   LoRa.beginPacket();
@@ -116,6 +116,7 @@ void SerialPrintGPS(){
 
 void storeToSD(const String& lat, const String& lng){
   static int i = 1;
+  Serial.println("Filename: " + logger.Filename());
   logger.Log(String(i++) + ": " + lat + " " + lng);
 }
 

LoRaSender/SDCardHelper.hpp

@@ -1,59 +1,80 @@
 #pragma once
+#include "FS.h"
 #include <SPI.h>
 #include <SD.h>
 
-typedef enum{ 
-  FAM_R, 
-  FAM_W 
-} FileAccessMode;
-
 class SDHelper {
 private:
   uint8_t _cs;
-  FileAccessMode _fam;
   File _stream;
   String _filename;
   bool _available = false;
   SPIClass _spi;
 
-  String getNewFilename() {
-    static unsigned long i = 0;
-    String name;
-    do {
-      name = "coords" + String(i++) + ".txt";
-    } while (SD.exists(name.c_str()));
-    return name;
+  String getNewFilename(fs::FS& fs) {
+    unsigned long i = 0;
+
+    File root = fs.open("/");
+    if(!root){
+      Serial.println("Failed to open root of SD!");
+      return "/coords.txt";
+    }
+
+    File file = root.openNextFile();
+    while(file){
+      if(String(file.name()).indexOf("coords") != -1) i++;
+      file = root.openNextFile();
+    }
+
+    return "/coords" + String(i++) + ".txt";
+  }
+
+  void appendFile(fs::FS& fs, const char* path, const char* message) {
+    Serial.printf("Appending to file: %s\n", path);
+
+    File file = fs.open(path, FILE_APPEND);
+    if(!file){
+      Serial.println("Failed to open file for appending!");
+      Serial.println("Trying writing insted!");
+
+      file = fs.open(path, FILE_WRITE);
+      if(!file){
+        Serial.println("Failed to open file for writing!");
+        return;
+      }
+    }
+
+    if(file.print(message))Serial.println("Wrote message!");
+    else Serial.println("Writing failed!");
+
+    file.close();
   }
 
 public:
-  SDHelper(uint8_t csPin, FileAccessMode fam, String filename = "") : _cs(csPin), _fam(fam), _spi(HSPI){
+  SDHelper() : _spi(HSPI){
     _spi.begin(14, 2, 15, 13);
-    if(!SD.begin(_cs, _spi)){ 
+    if(!SD.begin(13, _spi)){ 
       _available = false; 
       return;
     }
 
-    if(_fam == FAM_W){
-      _filename = filename.length() ? filename : getNewFilename();
-      _stream = SD.open(_filename.c_str(), FILE_WRITE);
-    } 
-    else {
-      _filename = filename;
-      _stream = SD.open(_filename.c_str(), FILE_READ);
+    uint8_t cardType = SD.cardType();
+
+    if (cardType == CARD_NONE) {
+      Serial.println("No SD card attached");
+      return;
     }
-    _available = (bool)_stream;
+
+    _filename = getNewFilename(SD);
   }
 
   ~SDHelper(){ 
     if(_stream) _stream.close();
   }
 
-  bool Available() const { return _available; }
-  const String& filename() const { return _filename; }
+  String Filename() { return _filename; }
 
   void Log(const String& msg) {
-    if(_fam != FAM_W || !_stream) return;
-    _stream.println(msg);
-    _stream.flush();
+    appendFile(SD, _filename.c_str(), (msg + "\n").c_str());
   }
 };