update pcspkdemo

c_os/user/PCSPKdemo.cc

@@ -1,6 +0,0 @@
-#include "user/PCSPKdemo.h"
-
-void PCSPKdemo::run() {
-    pcspk.tetris();
-    scheduler.exit();
-}

c_os/user/demo/PCSPKdemo.cc

@@ -0,0 +1,8 @@
+#include "user/demo/PCSPKdemo.h"
+
+void PCSPKdemo::run() {
+    (pcspk.*this->melody)();  // This syntax is confusing as hell
+
+    pcspk.off();
+    scheduler.exit();
+}

c_os/user/demo/PCSPKdemo.h

@@ -7,9 +7,10 @@
 class PCSPKdemo : public Thread {
 private:
     PCSPKdemo(const PCSPKdemo& copy) = delete;
+    void (PCSPK::*melody)(void);  // Allow to pass a melody to play when initializing the demo
 
 public:
-    PCSPKdemo() {
+    PCSPKdemo(void (PCSPK::*melody)(void)) : melody(melody) {
         kout << "Initialized PCSPKdemo" << endl;
     }