Fix warning caused by commit #f7a576f2e0efcee958bdfd737d9af7a2f6c76051

Author: rogerclarkmelbourne

STM32F1/cores/maple/libmaple/usb/stm32f1/usb_cdcacm.c

@@ -62,8 +62,8 @@
 
 #if !(defined(BOARD_maple) || defined(BOARD_maple_RET6) ||      \
       defined(BOARD_maple_mini) || defined(BOARD_maple_native))
-#warning USB CDC ACM relies on LeafLabs board-specific configuration.\
-    You may have problems on non-LeafLabs boards.
+//#warning USB CDC ACM relies on LeafLabs board-specific configuration.\
+//    You may have problems on non-LeafLabs boards.
 #endif
 
 static void vcomDataTxCb(void);

STM32F1/cores/maple/usb_serial.cpp

@@ -71,7 +71,7 @@ void USBSerial::begin(void) {
         return;
     _hasBegun = true;
 
-    usb_cdcacm_enable(BOARD_USB_DISC_DEV, BOARD_USB_DISC_BIT);
+    usb_cdcacm_enable(BOARD_USB_DISC_DEV, (uint8_t)BOARD_USB_DISC_BIT);
     usb_cdcacm_set_hooks(USB_CDCACM_HOOK_RX, rxHook);
     usb_cdcacm_set_hooks(USB_CDCACM_HOOK_IFACE_SETUP, ifaceSetupHook);
 #endif
@@ -97,7 +97,7 @@ volatile uint8_t removeCompilerWarningsIgnore=ignore;
 
 void USBSerial::end(void) {
 #if BOARD_HAVE_SERIALUSB
-    usb_cdcacm_disable(BOARD_USB_DISC_DEV, BOARD_USB_DISC_BIT);
+    usb_cdcacm_disable(BOARD_USB_DISC_DEV, (uint8_t)BOARD_USB_DISC_BIT);
     usb_cdcacm_remove_hooks(USB_CDCACM_HOOK_RX | USB_CDCACM_HOOK_IFACE_SETUP);
 	_hasBegun = false;
 #endif