From 33c05c17bf460f55cc9000f9307086032fe807c6 Mon Sep 17 00:00:00 2001
From: Andrzej Kaczmarek <andrzej.kaczmarek@codecoup.pl>
Date: Wed, 20 Dec 2017 15:18:46 +0100
Subject: [PATCH] Add readme

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+<!--
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
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+# regarding copyright ownership.  The ASF licenses this file
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+# "License"); you may not use this file except in compliance
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+#
+# http://www.apache.org/licenses/LICENSE-2.0
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+# 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.
+#
+-->
+
+# Apache Mynewt NimBLE
+
+## Overview
+
+See (https://mynewt.apache.org/network/ble/ble_intro/).
+
+## Building
+
+NimBLE is usually built as a part of Apache Mynewt OS, but ports for
+other RTOS-es are also available.
+
+### Apache Mynewt
+
+(tbd)
+
+### FreeRTOS on nRF52 DK
+
+1. Download and install NRF5 SDK
+
+You will need to download nRF5 SDK from Nordic Semiconductor website:
+(https://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF5-SDK).
+
+2. Make nRF5 SDK available for sample application
+
+Sample application expects nRF5 SDK to be available at location specified
+by `NRF5_SDK_ROOT` variable. By default it points to `./nrf5_sdk` directory
+(i.e. subdirectory of `porting/freertos_nrf5_sdk` directory) so the easiest
+way is to either copy nRF5 SDK to that location or make a symbolic link:
+
+```no-highlight
+    $ ln -s <x>/nRF5_SDK_12.3.0_d7731ad porting/freertos_nrf5_sdk/nrf5_sdk
+```
+
+Alternatively, you may want to overwrite default value of `NRF5_SDK_ROOT`
+to point to proper location:
+
+```no-highlight
+    $ export NRF5_SDK_ROOT=<x>/nRF5_SDK_12.3.0_d7731ad
+```
+
+3. Build and flash FreeRTOS image
+
+Provided Makefile is compatible with nRF5 SDK build system so sample
+application is built and flashed as other examples in nRF5 SDK:
+
+```no-highlight
+    $ make -C porting/freertos_nrf5_sdk
+    $ make -C porting/freertos_nrf5_sdk flash
+````
+