see also

• reMarkable Hardware
• rM discord

Introduction

Frameworks in use around the rM1 community for building apps

Handling Input

• ReCept: Remarkable Intercept
• turns the Lamy Pen into an eraser / github

Development

Setup toolchain

The official toolchain is no longer distributed by reMarkable.

Debian cross compilation tools

The GLIB version has to be fixed to 2.27 (How ?):

• Multiple glibc libraries on a single host
• Toltec crosstool-ng

Toltec build toolchain - set of docker images used for cross-compiling binaries for the the reMarkable tablet.

• use VSCode remote container with .devcontainer.json Remote-Containers: Reopen in Container

{
    "image": "ghcr.io/toltec-dev/qt:v1.3.2s"
}

• ex compiling tarnish

docker container run -it --rm ghcr.io/toltec-dev/qt:v1.1

Dockcross / Exploring the reMarkable via Shell

Dev / Awesome reMarkable

libremarkable - A low latency Framework for Remarkable Tablet

• using with Qt Rust code

make examples-docker
make deploy-demo

demo can be launched on rM2, using remux if place d inside /home/root/apps

• C CPP Build Instructions
  • Install debian cross compilation tools cross compilation tool.
  • change to HOST=arm-linux

dpkg --add-architecture armhf
sudo apt-get update
sudo dpkg --add-architecture armhf

git submodule init && git submodule update
make freetype
make libremarkable			# comment # include $(CONFIG)
make poc

rmkit / Home

• Allows testing on linux x86 with simulator (resim)

resim ./src/build/harmony

• Allows testing on linux x86 with frame buffer (go to console Ctrl+Alt+1) => this is going to disappear

Requires:

• okp - a python script that processes .cpy files and generates C++ code.
• resim - remarkable-simulator
  • it require tkinter sudo apt-get install python3-tk

Issue

• use strace to diagnore crash
  • harmony tried to read src/vendor/NotoSansMono-Regular.ttf which is missing and crash
• mouse not read on native ?
  • change USE_RESIM := true to false to use native mouse and keyboard

LDD (tracking dependancies on remarkable)

I installed ldd using opkg install ldd (it is found in entware)

but it didn’t work:

$ ldd ./fb_test 
        not a dynamic executable

# because it is not thre right linker that is used
# update LDLIST to the right linker makes it work
LDLIST=/lib/ld-linux-armhf.so.3

reMarkable Developper note

• curtisf overview
  • simple apps in C
  • framebuffer.c - you can write pixel data to /dev/fb0, and call ioctl to flush rectangles to the screen
  • input.c - You can read pen/touch input directly from /dev/input/event1
• Developing for the reMarkable tablet

• canselcik/libremarkable

• reMarkable 2 sources are published
  • rM2 3rd party apps progress
• Setting up QT Creator
• reMarkable/linux - linux kernel source for reMarkable

Filesystem / Document format

You will also notice that there are no human readable filenames and that each “document” has a number of associated files with it, depending on the document type. Human readable information is stored within the .metadata files (described further below).

• reMarkable .lines File Format
  • Lines Are Beautiful
  • remarkable-layers - Python module for reading and writing Remarkable Lines files (*.rm).

Handling Input

Using Display

Resources

• HN
  • HN
• remarkable.engineering
• remarkablewiki
  • tips
  • tech
• reMarkable