Update usb_mouse.c

teensy3/usb_mouse.c

 
 // Set the mouse buttons.  To create a "click", 2 calls are needed,
 // one to push the button down and the second to release it
-int usb_mouse_buttons(uint8_t left, uint8_t middle, uint8_t right)
+int usb_mouse_buttons(uint8_t left, uint8_t middle, uint8_t right, uint8_t back, uint8_t forward)
 {
         uint8_t mask=0;
 
-        if (left) mask |= 1;
-        if (middle) mask |= 4;
-        if (right) mask |= 2;
+        if (left) mask    |= 1;
+        if (middle) mask  |= 4;
+        if (right) mask   |= 2;
+        if (back) mask    |= 8;
+        if (forward) mask |= 16;
         usb_mouse_buttons_state = mask;
         return usb_mouse_move(0, 0, 0);
 }
 // When the PC isn't listening, how long do we wait before discarding data?
 #define TX_TIMEOUT_MSEC 30
 
-#if F_CPU == 192000000
-  #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1280)
-#elif F_CPU == 180000000
-  #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1200)
-#elif F_CPU == 168000000
+#if F_CPU == 168000000
   #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 1100)
 #elif F_CPU == 144000000
   #define TX_TIMEOUT (TX_TIMEOUT_MSEC * 932)