[utils-settings] add a header file for settings config definitions (#4458)

This commit adds a header file `settings.h` to include all the
default configuration definitions related to `settings` platform
utility. It also adds `OPENTHREAD_SETTINGS_RAM` to this file.
This helps address the undefined macro warnings.

examples/platforms/utils/Makefile.am

@@ -45,6 +45,7 @@ libopenthread_platform_utils_a_SOURCES  = \
     logging_rtt.h                         \
     mac_frame.cpp                         \
     mac_frame.h                           \
+    settings.h                            \
     settings_ram.c                        \
     settings_flash.c                      \
     soft_source_match_table.c             \

examples/platforms/utils/settings.h

@@ -0,0 +1,80 @@
+/*
+ *  Copyright (c) 2016-2020, The OpenThread Authors.
+ *  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 holder 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 AND CONTRIBUTORS "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 OR CONTRIBUTORS 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.
+ */
+
+/**
+ * @file
+ *   This file defines the configuration options for platform abstraction of non-volatile storage of settings.
+ *
+ */
+
+#ifndef UTILS_SETTINGS_H_
+#define UTILS_SETTINGS_H_
+
+#include <openthread-core-config.h>
+
+/**
+ * @def SETTINGS_CONFIG_BASE_ADDRESS
+ *
+ * The base address of settings.
+ *
+ */
+#ifndef SETTINGS_CONFIG_BASE_ADDRESS
+#define SETTINGS_CONFIG_BASE_ADDRESS 0x39000
+#endif
+
+/**
+ * @def SETTINGS_CONFIG_PAGE_SIZE
+ *
+ * The page size of settings.
+ *
+ */
+#ifndef SETTINGS_CONFIG_PAGE_SIZE
+#define SETTINGS_CONFIG_PAGE_SIZE 0x800
+#endif
+
+/**
+ * @def SETTINGS_CONFIG_PAGE_NUM
+ *
+ * The page number of settings.
+ *
+ */
+#ifndef SETTINGS_CONFIG_PAGE_NUM
+#define SETTINGS_CONFIG_PAGE_NUM 2
+#endif
+
+/**
+ * @def OPENTHREAD_SETTINGS_RAM
+ *
+ * Define as 1 to enable saving the settings in RAM instead of flash.
+ *
+ */
+#ifndef OPENTHREAD_SETTINGS_RAM
+#define OPENTHREAD_SETTINGS_RAM 0
+#endif
+
+#endif // UTILS_SETTINGS_H_

examples/platforms/utils/settings_flash.c

@@ -32,12 +32,12 @@
  *
  */
 
+#include "settings.h"
+
 #include <assert.h>
 #include <stddef.h>
 #include <stdlib.h>
 
-#include <openthread-core-config.h>
-
 #include <openthread/instance.h>
 #include <openthread/platform/settings.h>
 
@@ -67,36 +67,6 @@ struct settingsBlock
     uint16_t reserved;
 } OT_TOOL_PACKED_END;
 
-/**
- * @def SETTINGS_CONFIG_BASE_ADDRESS
- *
- * The base address of settings.
- *
- */
-#ifndef SETTINGS_CONFIG_BASE_ADDRESS
-#define SETTINGS_CONFIG_BASE_ADDRESS 0x39000
-#endif // SETTINGS_CONFIG_BASE_ADDRESS
-
-/**
- * @def SETTINGS_CONFIG_PAGE_SIZE
- *
- * The page size of settings.
- *
- */
-#ifndef SETTINGS_CONFIG_PAGE_SIZE
-#define SETTINGS_CONFIG_PAGE_SIZE 0x800
-#endif // SETTINGS_CONFIG_PAGE_SIZE
-
-/**
- * @def SETTINGS_CONFIG_PAGE_NUM
- *
- * The page number of settings.
- *
- */
-#ifndef SETTINGS_CONFIG_PAGE_NUM
-#define SETTINGS_CONFIG_PAGE_NUM 2
-#endif // SETTINGS_CONFIG_PAGE_NUM
-
 #if (SETTINGS_CONFIG_PAGE_NUM <= 1)
 #error "Invalid value for `SETTINGS_CONFIG_PAGE_NUM` (should be >= 2)"
 #endif

examples/platforms/utils/settings_ram.c

@@ -32,7 +32,7 @@
  *
  */
 
-#include <openthread-core-config.h>
+#include "settings.h"
 
 #include <assert.h>
 #include <stddef.h>