Add scroll wheel status and middle mouse button click

Author: jbilander

examples/peripherals/usb/host/hid/main/hid_host_example.c

@@ -329,16 +329,19 @@ static void hid_host_mouse_report_callback(const uint8_t *const data, const int
 
     static int x_pos = 0;
     static int y_pos = 0;
+    static int wheel_pos = 0;
 
     // Calculate absolute position from displacement
     x_pos += mouse_report->x_displacement;
     y_pos += mouse_report->y_displacement;
+    wheel_pos += mouse_report->scrollwheel;
 
     hid_print_new_device_report_header(HID_PROTOCOL_MOUSE);
 
-    printf("X: %06d\tY: %06d\t|%c|%c|\r",
-           x_pos, y_pos,
+    printf("X: %06d\tY: %06d\tWheel: %06d\t|%c|%c|%c|\r",
+           x_pos, y_pos, wheel_pos,
            (mouse_report->buttons.button1 ? 'o' : ' '),
+           (mouse_report->buttons.button3 ? 'o' : ' '),
            (mouse_report->buttons.button2 ? 'o' : ' '));
     fflush(stdout);
 }