add a script to get the nrf5 sdk

nrf_sdks/README.md

@@ -2,7 +2,7 @@
 
 Download the SDK package from [www.nordicsemi.com](https://www.nordicsemi.com/Software-and-Tools/Software/nRF5-SDK/).
 
-The latest version is `15.2.0`, it can be downloaded directly here: [nRF5_SDK_v15.2.0_9412b96](https://www.nordicsemi.com/Software-and-Tools/Software/nRF5-SDK/Download#infotabs)
+The examples are based on nRF5 SDK 15.2.0, it can be downloaded directly here: [nRF5_SDK_v15.2.0_9412b96](https://www.nordicsemi.com/Software-and-Tools/Software/nRF5-SDK/Download#infotabs)
 
 Extract the zip file into this directory. This should give you the following folder structure:
 
@@ -20,6 +20,8 @@ Extract the zip file into this directory. This should give you the following fol
 └── tools
 ```
 
+If you have `wget` and `unzip`, you can run `./get.sh` to download and extract the sdk.
+
 Config the toolchain path in `makefile.windows` or `makefile.posix` depending on platform you are using. That is, the `.posix` should be edited if your are working on either Linux or macOS. These files are located in:
 
 ``` sh

nrf_sdks/get.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+NRF5_SDK=nRF5_SDK_15.2.0_9412b96
+NRF5_SDK_ARCHIVE=${NRF5_SDK}.zip
+NRF5_SDK_MAJOR=`echo ${NRF5_SDK} | sed -e "s/nRF5_SDK_\([0-9]*\)\..*/\1/g"`
+NRF5_SDK_URL=https://developer.nordicsemi.com/nRF5_SDK/nRF5_SDK_v${NRF5_SDK_MAJOR}.x.x/${NRF5_SDK_ARCHIVE}
+
+echo ${NRF5_SDK_URL}
+
+if [ ! -d ${NRF5_SDK} ]
+then
+    wget -c ${NRF5_SDK_URL}
+    unzip ${NRF5_SDK_ARCHIVE} -d .
+fi