Remove use of deprecated attach in USB

Attach callbacks with the assignment operator rather than with the
deprecated attach function. This fixes deprecation warnings.

This patch also adds the ability to attach a Callback directly.

Author: c1728p9

features/unsupported/USBDevice/USBAudio/USBAudio.h

@@ -152,23 +152,23 @@ class USBAudio: public USBDevice {
      *
      */
     void attach(void(*fptr)(void)) {
-        updateVol.attach(fptr);
+        updateVol = Callback<void()>(fptr);
     }
 	/** attach a handler to Tx Done
      *
      * @param function Function to attach
      *
      */
     void attachTx(void(*fptr)(void)) {
-        txDone.attach(fptr);
+        txDone = Callback<void()>(fptr);
     }
     /** attach a handler to Rx Done
      *
      * @param function Function to attach
      *
      */
     void attachRx(void(*fptr)(void)) {
-        rxDone.attach(fptr);
+        rxDone = Callback<void()>(fptr);
     }
 
     /** Attach a nonstatic void/void member function to update the volume
@@ -179,15 +179,52 @@ class USBAudio: public USBDevice {
      */
     template<typename T>
     void attach(T *tptr, void(T::*mptr)(void)) {
-        updateVol.attach(tptr, mptr);
+        updateVol = Callback<void()>(tptr, mptr);
     }
+    /** Attach a nonstatic void/void member function to Tx Done
+     *
+     * @param tptr Object pointer
+     * @param mptr Member function pointer
+     *
+     */
 	template<typename T>
 	void attachTx(T *tptr, void(T::*mptr)(void)) {
-        txDone.attach(tptr, mptr);
+        txDone = Callback<void()>(tptr, mptr);
     }
+    /** Attach a nonstatic void/void member function to Rx Done
+     *
+     * @param tptr Object pointer
+     * @param mptr Member function pointer
+     *
+     */
     template<typename T>
 	void attachRx(T *tptr, void(T::*mptr)(void)) {
-        rxDone.attach(tptr, mptr);
+        rxDone = Callback<void()>(tptr, mptr);
+    }
+
+    /** Attach a Callback to update the volume
+     *
+     * @param cb Callback to attach
+     *
+     */
+    void attach(Callback<void()> &cb) {
+        updateVol = cb;
+    }
+    /** attach a Callback to Tx Done
+     *
+     * @param cb Callback to attach
+     *
+     */
+    void attachTx(Callback<void()> &cb) {
+        txDone = cb;
+    }
+    /** attach a Callback to Rx Done
+     *
+     * @param cb Callback to attach
+     *
+     */
+    void attachRx(Callback<void()> &cb) {
+        rxDone = cb;
     }
 
 

features/unsupported/USBDevice/USBSerial/USBSerial.h

@@ -127,7 +127,7 @@ class USBSerial: public USBCDC, public Stream {
     template<typename T>
     void attach(T* tptr, void (T::*mptr)(void)) {
         if((mptr != NULL) && (tptr != NULL)) {
-            rx.attach(tptr, mptr);
+            rx = Callback<void()>(mptr, tptr);
         }
     }
 
@@ -138,10 +138,19 @@ class USBSerial: public USBCDC, public Stream {
      */
     void attach(void (*fptr)(void)) {
         if(fptr != NULL) {
-            rx.attach(fptr);
+            rx = Callback<void()>(fptr);
         }
     }
 
+    /**
+     * Attach a Callback called when a packet is received
+     *
+     * @param cb Callback to attach
+     */
+    void attach(Callback<void()> &cb) {
+        rx = cb;
+    }
+
     /**
      * Attach a callback to call when serial's settings are changed.
      *