Currently, this is only Nordic's sample ble_hrs. And contains version 4.2 of the SDK from Nordic. In order to get it working, it is necessary to install a GCC Toolchain and JLink. This project was inspired by this and this project.

In order to compile and link it is necessary to install a GCC toolchain. I use the one from CodeSourcery which can be downloaded here.

This link should guide you to the correct release, but make sure the the "EABI Release" is chosen. The file is distributed as a .tar.bz2 file that can be decomressed with tar. I moved the compiler toolchain into the /opt directory, which is reserved for all software that are not part of the default installation like so:

tar -xvf arm-2012.09-63-arm-none-eabi-i686-pc-linux-gnu.tar.bz2
sudo mv arm-2012.09 /opt/

In order to use the compiler with the provided Makefile, it is necessary to point the GCC_INSTALL_ROOT variable(line 3 in Makefile) so that it points in the correct location, if you use the same compiler as I do.

Download the JLink software from Segger from here. In order to download it, it is necessary to register the serial number of the emulator that you have. This is a .tgz file that again can be decompressed with tar. Now that the file has been downloaded, run the following commands:

tar -xvf JLink_Linux_V462a.tgz
cd JLink_Linux_V462a
sudo cp 45-jlink.rules /etc/udev/rules.d/
cd ..
sudo mv JLink_Linux_V462a /opt/

In order to upload programs to the MCU with JLink it is necessary to alter the JLIINK_DIR(line 46 in Makefile) such that it points at the correct directory.

Once you have compiled for the first time, the directory structure looks like this:

.
├── bin     --> Contains the map files
├── build   --> Contains hex/bin/log files as well as JLink scripts
├── include --> Contains header files for the project
├── lib     --> Contains Nordics SDK as well as the softdevice hex file
├── obj     --> .o files
└── src     --> Contains source files for the project

The following makefile targets exist, though not all of them have been tested

make                    --> Compiles project.
make all                --> Same as make
make clean              --> Cleans all object files, output files, map files etc.
make erase-all          --> Erases entire contents of memory
make recover            --> Restores MCU to original state -- NOT TESTED YET
make release            --> Same as make
make startdebug         --> Starts GDB Server -- NOT TESTED YET
make stop debug         --> Stops GDB Server -- NOT TESTED YET
make upload             --> Uploads output hex file on to the MCU
make upload-softdevice  --> Uploads the softdevice hex file on to the MCU