add two-sid example + move some folders to /extras

examples/reSID2/reSID2.ino

@@ -0,0 +1,105 @@
+
+//#include "tower.h"
+#include <Audio.h>
+#include <Wire.h>
+#include <SPI.h>
+#include <SD.h>
+#include <SerialFlash.h>
+#include "reSID.h"
+
+#define DMP  "/dmp/GHOSTB~1.DMP"
+#define DMP2 "/dmp/pp_ham~1.DMP"
+
+// GUItool: begin automatically generated code
+AudioPlaySID             playSID;  //xy=189,110
+AudioPlaySID             playSID1;  //xy=189,110
+AudioOutputI2S           i2s1;           //xy=366,111
+AudioConnection          patchCord1(playSID, 0, i2s1, 0);
+AudioConnection          patchCord2(playSID1, 0, i2s1, 1);
+AudioControlSGTL5000     sgtl5000_1;     //xy=354,176
+// GUItool: end automatically generated code
+
+
+const int SDchipSelect = 10;
+
+File myfile;
+File myfile2;
+
+char buffer[26];
+char oldbuffer[26];
+char oldbuffer2[26];
+
+
+void setup() {
+
+#if USETOWER
+  initTower();
+#endif  
+  
+  AudioMemory(4);
+  
+  SPI.setSCK(14);      
+  SPI.setMOSI(7);
+  SPI.setMISO(12);
+  SPI.begin();
+  
+  sgtl5000_1.enable();
+  sgtl5000_1.volume(0.8);
+  sgtl5000_1.enhanceBassEnable();
+  sgtl5000_1.enhanceBass(0.5, 2.5);
+
+  memset(oldbuffer,0,sizeof(oldbuffer));
+  
+  int ml = millis();
+  while (!Serial && (millis()-ml < 1000)) ; // wait for Arduino Serial Monitor
+  
+  Serial.print("Initializing SD card...");
+
+  if (!SD.begin(SDchipSelect)) {
+    Serial.println("initialization failed!");
+    return;
+  }
+  Serial.println("initialization done.");
+
+  myfile = SD.open(DMP, FILE_READ);
+  myfile2 = SD.open(DMP2, FILE_READ);
+
+}
+
+
+void loop() {
+    static int m = millis();
+    if (millis()-m < 20) return;
+    m = millis();
+        
+
+    //Play first file
+    if (myfile.available()) {
+      myfile.read(buffer, 25);
+      for(int i=0;i<25;i++) {
+        if(buffer[i] != oldbuffer[i]) {       
+           playSID.setreg(i, buffer[i]);
+          oldbuffer[i] = buffer[i];                  
+        } 
+      }
+    } else {
+      if (playSID.isPlaying()) playSID.stop();
+    }
+
+    //Play second file
+    if (myfile2.available()) {
+      myfile2.read(buffer, 25);
+      for(int i=0;i<25;i++) {
+        if(buffer[i] != oldbuffer2[i]) {                
+           playSID1.setreg(i, buffer[i]);
+          oldbuffer2[i] = buffer[i];                  
+        } 
+      }
+    } else {
+      if (playSID1.isPlaying()) playSID1.stop();
+    }
+      
+}
+
+
+