Description

This is a drawing program that is meant to be run on a Kobo e-reader.

It has only been tested on the Glo HD and the Aura ONE.

Installation

First install fmon.

And then issue: unzip sketch.zip -d SD_ROOT.

Usage

Use your fingers to draw.

A short press/release of the power button will:

• Save and clear the canvas if it isn't empty.
• Quit if it's empty.

A long press/release (held more than 2 seconds) of the power button will inverse the displayed colors.

Configuration

If the touch feedback doesn't match the position of your fingers, add the following:

export SKETCH_UNSWAP_XY=1
export SKETCH_UNMIRROR_X=1

in sketch.sh after export PRODUCT….

Building

The OS used on the Kobo devices is Linaro 2011.07.

In order to build for this OS / architecture you can, for example, install Ubuntu LTS 12.04 (the GLIBC version must be old enough) in a VM and install the following package: gcc-4.6-arm-linux-gnueabihf.

Install the appropriate target:

rustup target add arm-unknown-linux-gnueabihf

Append this:

[target.arm-unknown-linux-gnueabihf]
linker = "arm-linux-gnueabihf-gcc"

to ~/.cargo/config.

The binary can then be generated with:

cargo rustc --release --target=arm-unknown-linux-gnueabihf -- -C target-feature=+v7,+vfp3,+a9,+neon

You can tell what features are supported by your device from the output of cat /proc/cpuinfo.