Use the Web Builder

The Mizar32 Web Builder at http://builder.simplemachines.it lets you customise the firmware in several ways and will build you a new firmware image without you having to do any of this horrible stuff. But unfortunately at the moment, we don't have this feature yet for Hempl. See issue #4.

If that doesn't do enough for you, or if you just enjoy this kind of thing, then take a deep breath and...

Install an AVR32 cross-compiler

On GNU/Linux

Atmel AVR 32-bit Toolchain 3.4.2

The cross-compiler for GNU/Linux is the Atmel AVR Toolchain for Linux.

At the time of writing, July 2015, the latest version is Atmel AVR Toolchain 3.4.2, based on the GNU C Compiler version 4.4.7.

To skip the Atmel registration form, you can use these quick download links:

You will also need

Atmel AVR Toolchain 3.4.2 - Header Files

and, if you are interested in building the toolchain yourself, the source code is here:

Atmel AVR 32-bit Toolchain 3.4.2 - Source code

Fetching and unpacking the toolchain

Here we show the steps to install the 32-bit version:

cd
wget http://www.atmel.com/Images/avr32-gnu-toolchain-3.4.2.435-linux.any.x86.tar.gz
tar xfz avr32-gnu-toolchain-3.4.2.435-linux.any.x86.tar.gz
# Fetch, unpack and install the header files
wget http://www.atmel.com/Images/atmel-headers-6.1.3.1475.zip
unzip atmel-headers-6.1.3.1475.zip
mv atmel-headers-6.1.3.1475/avr32 avr32-gnu-toolchain-linux_x86/avr32/include/
# Clean up
rm -r atmel-headers*
rm avr32-gnu-toolchain-*.gz

then, to use it, once per session:

PATH=$HOME/avr32-gnu-toolchain-linux_x86/bin:$PATH
export PATH

you can, set the include path (C_INCLUDE_PATH), to use atmel-headers-6.1.3.1475 with avr32.

For the 64-bit version, replace every "x86" in the above with "x86_64"

Installing it as a Debian/Ubuntu package

To make a Debian/Ubuntu package out of this, do the above, then go:

sudo apt-get install alien fakeroot
cd avr32-gnu-toolchain-linux_x86
mkdir usr
mv [a-s]* usr/
# It includes a lot of files that it shouldn't, so select the toolchain ones.
tar cfz avr32-gnu-toolchain-3.4.2.tgz usr/avr32 usr/bin/avr32-* \
    usr/lib/gcc/avr32 usr/libexec usr/share/man/man1 
fakeroot alien --keep-version avr32-gnu-toolchain-3.4.2.tgz
mv avr32-gnu-toolchain_3.4.2-1_all.deb avr32-gnu-toolchain_3.4.2-1_i386.deb
rm avr32-gnu-toolchain-3.4.2.tgz
rm -r usr

or, for the 64-bit version, do the same thing in avr32-gnu-toolchain-linux_x86_64 and rename the .deb file to ..._amd64.deb

If you had installed their old 2.4.2 Ubuntu packages, you will need to remove those first:

sudo apt-get purge avr32-binutils avr32-buildroot-essentials avr32-gcc-newlib \
 avr32-gdb avr32gdbproxy avr32headers avr32parts avr32program avr32trace \
 avrfwupgrade libavr32ocd libavr32sim libavrtools libelfdwarfparser

then you can install the new toolchain with

sudo dpkg -i avr32-gnu-toolchain_3.4.2-1_*.deb

(to remove it again, sudo apt-get purge avr32-gnu-toolchain)

Build a toolchain from source code

ct-ng, a fork of crosstool-ng, builds better AVR32 cross compilers for you:

sudo apt-get install git autoconf bash gawk g++ libncurses-dev
git clone http://anonymous@spaces.atmel.com/git/ct-ng 
cd ct-ng
./bootstrap
./configure --enable-local
make
./ct-ng build

By default, it installs the cross-toolchain under your home directory, so before building eLua you need to say:

PATH=$HOME/x-tools/avr32-unknown-none/bin:$PATH
export PATH

On Windows

Atmel also provide the Atmel AVR Toolchain for Windows as a setup.exe, for which the quick download link is:

Atmel AVR Toolchain 3.4.2 for Windows

Install the build system

The Hempl build system (same as the official elua0.9) uses "scons" and "gcc". The Hempl sources are under git, so install those.

On Debian or Ubuntu:

sudo apt-get install scons gcc git

Download the sources

Stable release

The latest stable source release is hempl-1.0, which fully supports the Mizar32 boards.

wget https://github.com/simplemachines-italy/hempl/archive/v1.0.tar.gz
tar xfz v1.0.tar.gz
cd v1.0

An alternative is:

The current development version

The Hempl project

git clone https://github.com/simplemachines-italy/hempl.git
cd hempl

Compile Hempl

For Mizar32 A and B

The 256KB and 512KB flash/64MB internal RAM versions of Mizar32 use the same Hempl firmware. Use this command:

scons board=mizar32 cpu=AT32UC3A0256

If you're compiling the Hempl sources, the build will create a file hempl_at32uc3a0256.elf.

For Mizar32 C

We can't directly compile Hempl for Mizar32-C. It only has 128K of flash! There's another way. We use emBLOD for that. To understand how that works, see the chapter The emBLOD second-stage boot loader.

Program the firmware to the board

When the compilation is finished, it should have created a file called something like hempl_at32uc3a0256.elf which can be programmed into the Mizar32 board in various ways: see the chapter on Flashing firmware.

If you will be using dfu-programmer to do this, you will first need to convert your .elf file to a .hex file. For example:

hempl=hempl_at32uc3a0256
avr32-objcopy -O ihex $hempl.elf $hempl.hex