boards: cxd56xx: Add board serial string for usb devices

Add obtaining board unique serial string logic for USB devices.

refs #13909

boards/arm/cxd56xx/common/src/Make.defs

@@ -164,6 +164,10 @@ ifeq ($(CONFIG_CXD56_SPISD),y)
   CSRCS += cxd56_spisd.c
 endif
 
+ifeq ($(CONFIG_BOARD_USBDEV_SERIALSTR),y)
+  CSRCS += cxd56_usbdevserialstr.c
+endif
+
 DEPPATH += --dep-path src
 VPATH += :src
 CFLAGS += $(shell $(INCDIR) "$(CC)" $(TOPDIR)$(DELIM)arch$(DELIM)$(CONFIG_ARCH)$(DELIM)src$(DELIM)board$(DELIM)src)

boards/arm/cxd56xx/common/src/cxd56_usbdevserialstr.c

@@ -0,0 +1,52 @@
+/****************************************************************************
+ * boards/arm/cxd56xx/common/src/cxd56_usbdevserialstr.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+
+#include "cxd56_uid.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+#ifdef CONFIG_BOARD_USBDEV_SERIALSTR
+
+static char g_serialstr[CONFIG_BOARDCTL_UNIQUEID_SIZE * 2 + 1];
+
+FAR const char *board_usbdev_serialstr(void)
+{
+  uint8_t uid[CONFIG_BOARDCTL_UNIQUEID_SIZE];
+
+  cxd56_get_uniqueid(uid);
+
+  snprintf(g_serialstr, sizeof(g_serialstr),
+           "%02X%02X%02X%02X%02X",
+           uid[0], uid[1], uid[2], uid[3], uid[4]);
+
+  return g_serialstr;
+}
+
+#endif