enable usb cdc interface

not handle anything yet.

ports/nrf/Makefile

@@ -116,8 +116,6 @@ SRC_C += \
 	boards/$(BOARD)/board.c \
 	nrfx/mdk/system_$(MCU_SUB_VARIANT).c \
 	device/$(MCU_VARIANT)/startup_$(MCU_SUB_VARIANT).c \
-	usb/tusb_descriptors.c \
-	usb/msc_flash.c \
 	lib/oofatfs/ff.c \
 	lib/oofatfs/option/ccsbcs.c \
 	lib/timeutils/timeutils.c \
@@ -127,6 +125,15 @@ SRC_C += \
 	lib/utils/pyexec.c \
 	lib/libc/string0.c \
 	lib/mp-readline/readline.c \
+	internal_flash.c \
+
+
+ifeq ($(MCU_SUB_VARIANT),nrf52840)
+
+SRC_C += \
+	usb/tusb_descriptors.c \
+	usb/usb_msc_flash.c \
+	usb/usb_cdc.c \
   lib/tinyusb/src/portable/nordic/nrf5x/dcd_nrf5x.c \
   lib/tinyusb/src/portable/nordic/nrf5x/hal_nrf5x.c \
   lib/tinyusb/src/common/tusb_fifo.c \
@@ -135,7 +142,8 @@ SRC_C += \
   lib/tinyusb/src/class/msc/msc_device.c \
   lib/tinyusb/src/class/cdc/cdc_device.c \
   lib/tinyusb/src/tusb.c \
-	internal_flash.c \
+  
+endif
 
 
 DRIVERS_SRC_C += $(addprefix modules/,\

ports/nrf/usb/tusb_config.h

@@ -68,7 +68,7 @@
 #define CFG_TUD_ENDOINT0_SIZE     64
 
 //------------- CLASS -------------//
-#define CFG_TUD_CDC               0
+#define CFG_TUD_CDC               1
 #define CFG_TUD_MSC               1
 #define CFG_TUD_HID_KEYBOARD      0
 #define CFG_TUD_HID_MOUSE         0

ports/nrf/usb/usb_cdc.c

@@ -0,0 +1,53 @@
+/**************************************************************************/
+/*!
+    @file     usb_cdc.c
+    @author   hathach (tinyusb.org)
+
+    @section LICENSE
+
+    Software License Agreement (BSD License)
+
+    Copyright (c) 2018, Adafruit Industries (adafruit.com)
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+    1. Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holders nor the
+    names of its contributors may be used to endorse or promote products
+    derived from this software without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
+    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
+    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/**************************************************************************/
+
+#include "tusb.h"
+
+/*------------------------------------------------------------------*/
+/* MACRO TYPEDEF CONSTANT ENUM
+ *------------------------------------------------------------------*/
+
+/*------------------------------------------------------------------*/
+/* VARIABLE DECLARATION
+ *------------------------------------------------------------------*/
+
+/*------------------------------------------------------------------*/
+/* FUNCTION DECLARATION
+ *------------------------------------------------------------------*/
+
+void tud_cdc_rx_cb(uint8_t port)
+{
+}

ports/nrf/usb/usb_msc_flash.c

@@ -1,6 +1,6 @@
 /**************************************************************************/
 /*!
-    @file     msc_flash.c
+    @file     usb_msc_flash.c
     @author   hathach (tinyusb.org)
 
     @section LICENSE