[!C] New Class for sd writer

2025-08-10 15:35:09 +02:00
parent 94402e106c
commit cd30c25956
2 changed files with 69 additions and 10 deletions
@@ -0,0 +1,58 @@
+#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(HSPI);
+
+  String getNewFilename() {
+    static unsigned long i = 0;
+    String name;
+    do {
+      name = "coords" + String(i++) + ".txt";
+    } while (SD.exists(name.c_str()));
+    return name;
+  }
+
+public:
+  SDHelper(uint8_t csPin, FileAccessMode fam, String filename = "") : _cs(csPin), _fam(fam) {
+    _spi.begin(14, 2, 15, 13);
+    if(!SD.begin(_cs, _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);
+    }
+    _available = (bool)_stream;
+  }
+
+  ~SDHelper(){ 
+    if(_stream) _stream.close();
+  }
+
+  bool Available() const { return _available; }
+  const String& filename() const { return _filename; }
+
+  void Log(const String& msg) {
+    if(_fam != FAM_W || !_stream) return;
+    _stream.println(msg);
+    _stream.flush();
+  }
+};