Compare commits

..
Author SHA1 Message Date
Dave Allie ddec7f78dd Fix hold to wake logic
esp_sleep_get_wakeup_cause does not seem to be set when not connected to USB power
2025-12-04 00:57:32 +11:00
Dave Allie 2f9f86b3dd Update README.md features 2025-12-04 00:14:47 +11:00
Dave Allie 47eb1157ef Support left and right buttons in reader and file picker 2025-12-04 00:11:51 +11:00
Dave Allie aee239a931 Adjust input button thresholds to support more devices 2025-12-04 00:11:51 +11:00
Dave Allie 1ee8b728f9 Add file selection screen 2025-12-04 00:11:51 +11:00
Dave Allie 2c80aca7b5 Use correct current page on reader screen
Fixes the page counter not updating
2025-12-03 22:34:16 +11:00
Dave Allie 7704772ebe Handle nested navpoint elements in nxc TOC 2025-12-03 22:30:50 +11:00
Dave Allie 4186c7da9e Remove debug lines 2025-12-03 22:30:13 +11:00
Dave Allie 802c9d0a30 Add web flashing instructions 2025-12-03 22:21:11 +11:00
Dave Allie 2ccdbeecc8 Public release 2025-12-03 22:06:45 +11:00
854 changed files with 32276 additions and 463611 deletions

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CompileFlags:
Add: [-std=c++2a]
Remove:
- -fno-tree-switch-conversion
- -fstrict-volatile-bitfields
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#!/usr/bin/env bash
set -euo pipefail
# Run formatter from repository root regardless of current directory.
REPO_ROOT="$(git rev-parse --show-toplevel)"
cd "${REPO_ROOT}"
# Capture the files already staged for commit so we only re-stage those
# paths after formatting.
staged_files=()
while IFS= read -r -d '' file; do
staged_files+=("${file}")
done < <(git diff --cached --name-only -z --diff-filter=ACMR)
# Intentionally format all currently modified tracked C/C++ files.
# The helper handles no-op cases and exits 0 when nothing matches.
echo "Running clang-format fix before commit..."
./bin/clang-format-fix
# Ensure formatting changes are included in the pending commit without
# staging unrelated tracked modifications from other files in the
# working tree.
if ((${#staged_files[@]})); then
git add -- "${staged_files[@]}"
fi
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github: [daveallie]
ko_fi: daveallie
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name: Bug Report
description: Report an issue or unexpected behavior
title: "Short, descriptive title of the issue"
labels: ["bug", "triage"]
body:
- type: markdown
attributes:
value: |
Thanks for taking the time to report this bug! Please fill out the details below.
- type: input
id: version
attributes:
label: Affected Version
description: What version of the project/library are you using? (e.g., v1.2.3, master branch commit SHA)
placeholder: Ex. v1.2.3
validations:
required: true
- type: textarea
id: bug-description
attributes:
label: Describe the Bug
description: A clear and concise description of what the bug is.
placeholder:
validations:
required: true
- type: textarea
id: steps-to-reproduce
attributes:
label: Steps to Reproduce
description: Clearly list the steps necessary to reproduce the unexpected behavior.
placeholder: |
1. Go to '...'
2. Select '...'
3. Crash
validations:
required: true
- type: textarea
id: expected-behavior
attributes:
label: Expected Behavior
description: A clear and concise description of what you expected to happen.
validations:
required: true
- type: textarea
id: logs
attributes:
label: Relevant Log Output/Screenshots
description: If applicable, error messages, or log output to help explain your problem. You can drag and drop images here.
render: shell
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## Summary
* **What is the goal of this PR?** (e.g., Implements the new feature for file uploading.)
* **What changes are included?**
## Additional Context
* Add any other information that might be helpful for the reviewer (e.g., performance implications, potential risks,
specific areas to focus on).
---
### AI Usage
While CrossPoint doesn't have restrictions on AI tools in contributing, please be transparent about their usage as it
helps set the right context for reviewers.
Did you use AI tools to help write this code? _**< YES | PARTIALLY | NO >**_
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{
"ref": "refs/heads/release/1.2",
"repository": {
"full_name": "jpirnay/crosspoint-reader"
}
}
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{
"action": "published",
"release": {
"tag_name": "1.40"
},
"repository": {
"full_name": "jpirnay/crosspoint-reader"
}
}
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../../.skills/SKILL.md
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name: CI (build)
on:
push:
branches: [master]
pull_request:
permissions:
contents: read
jobs:
clang-format:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v6
with:
submodules: recursive
- uses: actions/setup-python@v6
with:
python-version: "3.14"
- name: Install clang-format-21
run: |
wget https://apt.llvm.org/llvm.sh
chmod +x llvm.sh
sudo ./llvm.sh 21
sudo apt-get update
sudo apt-get install -y clang-format-21
- name: Run clang-format
run: |
PATH="/usr/lib/llvm-21/bin:$PATH" ./bin/clang-format-fix
git diff --exit-code || (echo "Please run 'bin/clang-format-fix' to fix formatting issues" && exit 1)
cppcheck:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v6
with:
submodules: recursive
- uses: actions/setup-python@v6
with:
python-version: "3.14"
- name: Install uv
uses: astral-sh/setup-uv@v7
with:
version: "latest"
enable-cache: false
- name: Install PlatformIO Core
run: uv pip install --system -U https://github.com/pioarduino/platformio-core/archive/refs/tags/v6.1.19.zip
- name: Run cppcheck
run: pio check --fail-on-defect low --fail-on-defect medium --fail-on-defect high
build:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v6
with:
submodules: recursive
- uses: actions/setup-python@v6
with:
python-version: "3.14"
- name: Install uv
uses: astral-sh/setup-uv@v7
with:
version: "latest"
enable-cache: false
- name: Install PlatformIO Core
run: uv pip install --system -U https://github.com/pioarduino/platformio-core/archive/refs/tags/v6.1.19.zip
- name: Build CrossPoint
run: |
set -euo pipefail
pio run | tee pio.log
- name: Extract firmware stats
run: |
set -euo pipefail
ram_line="$(grep -E "RAM:\\s" -m1 pio.log || true)"
flash_line="$(grep -E "Flash:\\s" -m1 pio.log || true)"
echo "ram_line=${ram_line}" >> "$GITHUB_OUTPUT"
echo "flash_line=${flash_line}" >> "$GITHUB_OUTPUT"
{
echo "## Firmware build stats"
if [ -n "$ram_line" ]; then echo "- ${ram_line}"; else echo "- RAM: not found"; fi
if [ -n "$flash_line" ]; then echo "- ${flash_line}"; else echo "- Flash: not found"; fi
} >> "$GITHUB_STEP_SUMMARY"
- name: Upload firmware.bin artifact
uses: actions/upload-artifact@v6
with:
name: firmware.bin
path: .pio/build/default/firmware.bin
if-no-files-found: error
run-tests:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v6
with:
submodules: recursive
- uses: actions/setup-python@v6
with:
python-version: "3.14"
- name: Run standalone tests
run: |
set +e
shopt -s nullglob
failed=0
tests=("test/run_*.sh")
if [ ${#tests[@]} -eq 0 ]; then
printf 'No tests found in test/ directory\n'
exit 1
fi
run_test() {
printf '\n== Running %s ==\n' "${1}"
if ! bash "${1}"; then
failed=1
fi
}
for t in ${tests[@]}; do
run_test "$t"
done
exit "${failed}"
# This job is used as the PR required actions check, allows for changes to other steps in the future without breaking
# PR requirements.
test-status:
name: Test Status
needs:
- build
- run-tests
- clang-format
- cppcheck
if: always()
runs-on: ubuntu-latest
steps:
- name: Fail because needed jobs failed
# Fail if any job failed or was cancelled (skipped jobs are ok)
if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
run: exit 1
- name: Success
run: exit 0
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name: "PR Formatting"
on:
pull_request:
pull_request_target:
types:
- opened
- reopened
- edited
permissions:
statuses: write
jobs:
title-check:
name: Title Check
runs-on: ubuntu-latest
steps:
- name: Harden Runner
uses: step-security/harden-runner@ec9f2d5744a09debf3a187a3f4f675c53b671911 # v2.13.0
with:
egress-policy: audit
- name: Check PR Title
uses: amannn/action-semantic-pull-request@v6
env:
GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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name: Compile Release
on:
release:
types: [published]
permissions:
contents: write
jobs:
build-release:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v6
with:
submodules: recursive
ref: ${{ github.event.release.tag_name }}
- uses: actions/setup-python@v6
with:
python-version: "3.14"
- name: Install uv
uses: astral-sh/setup-uv@v7
with:
version: "latest"
enable-cache: false
- name: Install PlatformIO Core
run: uv pip install --system -U https://github.com/pioarduino/platformio-core/archive/refs/tags/v6.1.19.zip
- name: Build CrossPoint
run: pio run -e gh_release
- name: Patch min_chip_rev_full to 0
run: python3 scripts/patch_min_chip_rev.py .pio/build/gh_release/firmware.bin
- name: Upload release assets
if: ${{ env.ACT != 'true' }}
uses: softprops/action-gh-release@v2
with:
tag_name: ${{ github.event.release.tag_name }}
files: |
.pio/build/gh_release/bootloader.bin
.pio/build/gh_release/firmware.bin
.pio/build/gh_release/firmware.elf
.pio/build/gh_release/firmware.map
.pio/build/gh_release/partitions.bin
fail_on_unmatched_files: true
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name: Publish Release Candidate
on:
push:
branches:
- "release/**"
permissions:
contents: write
jobs:
build-release-candidate:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v6
with:
submodules: recursive
fetch-depth: 0
- uses: actions/setup-python@v6
with:
python-version: "3.14"
- name: Install uv
uses: astral-sh/setup-uv@v7
with:
version: "latest"
enable-cache: false
- name: Install PlatformIO Core
run: uv pip install --system -U https://github.com/pioarduino/platformio-core/archive/refs/tags/v6.1.19.zip
- name: Extract env
run: |
VERSION="$(python3 - <<'PY'
import configparser
config = configparser.ConfigParser()
config.read("platformio.ini")
version = config["crosspoint"]["version"].strip()
if version.count(".") == 1:
version = f"{version}.0"
print(version)
PY
)"
NEXT_RC="$(python3 - "$VERSION" <<'PY'
import re
import subprocess
import sys
version = sys.argv[1]
pattern = re.compile(rf"^{re.escape(version)}-rc\.(\d+)(?:\.\d+)?$")
highest = 0
tags = subprocess.check_output(
["git", "tag", "-l", f"{version}-rc.*"],
text=True,
)
for tag in tags.splitlines():
match = pattern.match(tag)
if match:
highest = max(highest, int(match.group(1)))
print(highest + 1)
PY
)"
echo "RC_TAG=${VERSION}-rc.${NEXT_RC}" >> $GITHUB_ENV
echo "RELEASE_NOTES_PATH=${RUNNER_TEMP}/release-notes.md" >> $GITHUB_ENV
- name: Build CrossPoint Release Candidate
env:
CROSSPOINT_RC_VERSION: ${{ env.RC_TAG }}
run: pio run -e gh_release_rc
- name: Patch min_chip_rev_full to 0
run: python3 scripts/patch_min_chip_rev.py .pio/build/gh_release_rc/firmware.bin
- name: Generate release notes
env:
GITHUB_TOKEN: ${{ github.token }}
run: |
python3 scripts/generate_release_notes.py \
--output "${RELEASE_NOTES_PATH}" \
--target-sha "${GITHUB_SHA}" \
--current-label "${RC_TAG}" \
--release-scope any \
--exclude-tag "${RC_TAG}"
- name: Publish prerelease assets
if: ${{ env.ACT != 'true' }}
uses: softprops/action-gh-release@v2
with:
tag_name: ${{ env.RC_TAG }}
target_commitish: ${{ github.sha }}
name: CrossPoint ${{ env.RC_TAG }}
body_path: ${{ env.RELEASE_NOTES_PATH }}
prerelease: true
files: |
.pio/build/gh_release_rc/bootloader.bin
.pio/build/gh_release_rc/firmware.bin
.pio/build/gh_release_rc/firmware.elf
.pio/build/gh_release_rc/firmware.map
.pio/build/gh_release_rc/partitions.bin
fail_on_unmatched_files: true
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.pio
.idea
.DS_Store
.vscode
lib/EpdFont/fontsrc
lib/I18n/I18nKeys.h
lib/I18n/I18nStrings.h
lib/I18n/I18nStrings.cpp
*.generated.h
.vs
build
**/__pycache__/
/compile_commands.json
/.cache
.history/
/.venv
*.local*
*.cpfont
!assets/*.cpfont
!assets/**/*.cpfont
lib/EpdFont/scripts/downloaded_fonts/*
lib/EpdFont/scripts/instanced_fonts/*
lib/EpdFont/scripts/output/*
.editorconfig
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[submodule "open-x4-sdk"]
path = open-x4-sdk
url = https://github.com/jpirnay/community-sdk.git
branch = crosspoint-sdcard-extensions
url = https://github.com/open-x4-epaper/community-sdk.git
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.skills/SKILL.md
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# Project Governance & Community Principles
CrossPoint Reader is a community-driven, open-source project. Our goal is to provide a high-quality, open-source
firmware alternative for the Xteink X4 hardware. To keep this project productive and welcoming as we grow, we ask all
contributors to follow these principles.
### 1. The "Human First" Rule
Technical discussions can get heated, but they should never be personal.
- **Assume good intent:** We are all volunteers working on this in our free time. If a comment seems abrasive, assume
it’s a language barrier or a misunderstanding before taking offense.
- **Focus on the code, not the person:** Critique the implementation, the performance, or the UX. Never the intelligence
or character of the contributor.
- **Inflammatory language:** Personal attacks, trolling, or exclusionary language (based on race, gender, background,
etc.) are not welcome here and will be moderated.
### 2. A "Do-ocracy" with Guidance
CrossPoint thrives because people step up to build what they want to see.
- If you want a feature, the best way to get it is to start an
[Idea Discussion](https://github.com/crosspoint-reader/crosspoint-reader/discussions/categories/ideas) or open a PR.
- If you want to report a bug, check for duplicates and create an
[Issue](https://github.com/crosspoint-reader/crosspoint-reader/issues).
- While we encourage experimentation, the maintainers reserve the right to guide the project’s technical direction to
ensure stability on the ESP32-C3’s constrained hardware.
- For more guidance on the scope of the project, see the [SCOPE.md](SCOPE.md) document.
### 3. Transparent Communication
To keep the project healthy, we keep our "work" in the open.
- **Public by Default:** All technical decisions and project management discussions happen in GitHub Issues, Pull
Requests, or the public Discussions tab.
- **Clarity in Writing:** Because we have a global community with different levels of English proficiency, please be as
explicit and clear as possible in your PR descriptions and bug reports.
### 4. Moderation & Safety
The maintainers are responsible for keeping the community a safe place to contribute.
- We reserve the right to hide comments, lock threads, or block users who repeatedly violate these principles or engage
in harassment.
- **Reporting:** If you feel you are being harassed or see behavior that is damaging the community, please reach out
privately to @daveallie.
+108 -37
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# CrossPoint Reader ++
# CrossPoint Reader
This firmware is based on the [crosspoint-reader](https://github.com/crosspoint-reader/crosspoint-reader) for the XTEINK X4, a great piece of software by Dave Allie and others
Firmware for the **Xteink X4** e-paper display reader (unaffiliated with Xteink).
Built using **PlatformIO** and targeting the **ESP32-C3** microcontroller.
# Why this fork
CrossPoint Reader is a purpose-built firmware designed to be a drop-in, fully open-source replacement for the official
Xteink firmware. It aims to match or improve upon the standard EPUB reading experience.
Unfortunately the official repository suffers from too many good ideas floating around and a lack of clear governance how to deal
with these contributions, so it's lacking fundamental fixes for a proper reading experience (rendering issues, sub-par sync
capabilities with KOReader, a popular multi-platform open-source epub reader).
// TODO include some images
Trying to contribute enhancements / fixes became increasingly difficult as the lack of progress effectively prevented further development.
I look at the [**diy-esp32-epub-reader** by atomic14](https://github.com/atomic14/diy-esp32-epub-reader) project a lot
when making CrossPoint and a handful of lessons and some direct source code comes directly from that repo.
Therefore this branch focuses on real fixes and real improvements while trying to keep up to pace with developments in the main branch.
## Motivation
# What's different
E-paper devices are fantastic for reading, but most commercially available readers are closed systems with limited
customisation. The **Xteink X4** is an affordable, e-paper device, however the official firmware remains closed.
CrossPoint exists partly as a fun side-project and partly to open up the ecosystem and truely unlock the device's
potential.
- Proper KOReader Snychronisation (including https TLS OOM fix)
- Fixes for a lot of css rendering issues
- Additional sleep screens support (information overlay, transparent pictures over current reader screen)
- Clock-Support
- Weather information panel
- Multiple under-the-hood performance improvements
- Book information screen
- Markdown-support
- WiFi captive portal support
- Supporting ~~strikethrough~~, superscript / subscript (*) and tables
- Support for used defined actions on double-click / long-click per button (*)
- User defined fonts
- ...
CrossPoint Reader aims to:
* Provide a **fully open-source alternative** to the official firmware.
* Offer a **document reader** capable of handling EPUB content on constrained hardware.
* Support **customisable font, layout, and display** options.
* Run purely on the **Xteink X4 hardware**.
This project is **not affiliated with Xteink**; it's built as a community project.
## Features
- [x] EPUB parsing and rendering
- [x] Saved reading position
- [ ] File explorer with file picker
- [x] Basic EPUB picker from root directory
- [ ] Support nested folders
- [ ] EPUB picker with cover art
- [ ] Image support within EPUB
- [ ] Configurable font, layout, and display options
- [ ] WiFi connectivity
- [ ] BLE connectivity
## Getting Started
### Prerequisites
* **PlatformIO Core** (`pio`) or **VS Code + PlatformIO IDE**
* Python 3.8+
* USB-C cable for flashing the ESP32-C3
* Xteink X4
### Flashing your device
#### Command line
Connect your Xteink X4 to your computer via USB-C and run the following command.
```sh
pio run --target upload
```
#### Web
1. Connect your Xteink X4 to your computer via USB-C
2. Download the `firmware.bin` file from the latest release via the [releases page](https://github.com/daveallie/crosspoint-reader/releases)
3. Go to https://xteink.dve.al/ and flash the firmware file using the "OTA fast flash controls" section
4. Press the reset button on the Xteink X4 to restart the device
To revert back to the official firmware, you can flash the latest official firmware from https://xteink.dve.al/, or swap
back to the other partition using the "Swap boot partition" button here https://xteink.dve.al/debug.
## Internals
CrossPoint Reader is pretty aggressive about caching data down to the SD card to minimise RAM usage. The ESP32-C3 only
has ~380KB of usable RAM, so we have to be careful. A lot of the decisions made in the design of the firmware were based
on this constraint.
### EPUB caching
The first time chapters of an EPUB are loaded, they are cached to the SD card. Subsequent loads are served from the
cache. This cache directory exists at `.crosspoint` on the SD card. The structure is as follows:
# Choosing the _right_ reader...
```
.crosspoint/
├── epub_12471232/ # Each EPUB is cached to a subdirectory named `epub_<hash>`
│ ├── progress.bin # Stores reading progress (chapter, page, etc.)
│ ├── 0/ # Each chapter is stored in a subdirectory named by its index (based on the spine order)
│ │ ├── section.bin # Section metadata (page count)
│ │ ├── page_0.bin # Each page is stored in a separate file, it
│ │ ├── page_1.bin # contains the position (x, y) and text for each word
│ │ └── ...
│ ├── 1/
│ │ ├── section.bin
│ │ ├── page_0.bin
│ │ ├── page_1.bin
│ │ └── ...
│ └── ...
│
└── epub_189013891/
```
Your usecase might be completely different from mine, so I try to give an overview of the different reader flavors to my best knowledge. If you know of more variants / have more information, then let me know
Deleting the `.crosspoint` directory will clear the cache.
Last update: May, 15th, 2026
Due the way it's currently implemented, the cache is not automatically cleared when the EPUB is deleted and moving an
EPUB file will reset the reading progress.
| Reader | Visual appeal | Functionality | Formats | Pros | Cons | Custom fonts | CJK | Bluetooth |
| ------------------------------------ | ------------- | ------------- | ------- | ---- | ---- | ------------ | --- | --- |
| [Stock](https://www.xteink.com) | Okay | Reader | XTC, EPUB, TXT | Frequent official updates | Lot of rendering issues | Yes | Yes | Yes |
| [THIS FORK: CrossPoint ++](https://github.com/jpirnay/crosspoint-reader) | Okay | Calibre Wireless support; Proper KOReader progress sync; Wi-Fi transfer; Book Info; Clock, Weather Info | EPUB, XTC, TXT, MD | Faster integration of functionality | Small team | Yes | Limited | No |
| [CrossPoint](https://github.com/crosspoint-reader/crosspoint-reader) | Okay | Calibre Wireless support; KOReader progress sync; Wi-Fi transfer | EPUB, XTC, TXT | Biggest community | Least common denominator approach | Yes | No | No |
| [CrossPet](https://github.com/trilwu/crosspet) | Excellent, Playful | Virtual pet motivator; mini-games | EPUB, TXT | A lot of additional apps | Higher battery drain, Small team, bloaty | Yes | Yes | Yes |
| [Papyrix](https://github.com/bigbag/papyrix-reader) | Minimalist | Calibre Wireless support; exFAT support | EPUB, FB2, MD, TXT | A lot of good ideas | Small team | Yes | Yes | No |
| [Inx](https://github.com/obijuankenobiii/inx) | Nice | mainly crosspoint functionality plus reading statistics | EPUB, XTC, TXT | Good reading stats | Small team | No | No | No |
| [vCodex](https://github.com/franssjz/cpr-vcodex) | Nice | mainly crosspoint functionality plus reading statistics | EPUB, XTC, TXT | Good reading stats | Small team | No | No | No |
| [PlusPoint](https://github.com/ngxson/pluspoint-reader) | Okay | Experimental | EPUB, TXT, JS Apps | Support for custom JS apps; better RTC | Based on older code, small team | Yes | Yes | No |
| [SUMI](https://github.com/psychoplath9450/SUMI) | Nice | Lua custom apps; Bluetooth keyboard support for notes; Game Boy emulator; Bluetooth Transfer | EPUB, TXT, XTC, MD | Many apps, customizable, Papyrix fork | Single Contributor, **No Wi-Fi** | Yes | Yes | Yes |
| [CrossInk](https://github.com/uxjulia/CrossInk) | Okay | Calibre Wireless support; KOReader progress sync; Wi-Fi transfer | EPUB, XTC, TXT | One of the best alternatives | Small team | Yes | No | No |
## Contributing
Contributions are very welcome!
### To submit a contribution:
1. Fork the repo
2. Create a branch (`feature/dithering-improvement`)
3. Make changes
4. Submit a PR
---
CrossPoint Reader is **not affiliated with Xteink or any manufacturer of the X4 hardware**.
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# Project Vision & Scope: CrossPoint Reader
The goal of CrossPoint Reader is to create an efficient, open-source reading experience for the Xteink X4. We believe a
dedicated e-reader should do one thing exceptionally well: **facilitate focused reading.**
## 1. Core Mission
To provide a lightweight, high-performance firmware that maximizes the potential of the X4, prioritizing legibility and
usability over "swiss-army-knife" functionality.
## 2. Scope
### In-Scope
*These are features that directly improve the primary purpose of the device.*
* **User Experience:** E.g. User-friendly interfaces, and interactions, both inside the reader and navigating the
firmware. This includes things like button mapping, book loading, and book navigation like bookmarks.
* **Document Rendering:** E.g. Support for rendering documents (primarily EPUB) and improvements to the rendering
engine.
* **Format Optimization:** E.g. Efficiently parsing EPUB (CSS/Images) and other documents within the device's
capabilities.
* **Typography & Legibility:** E.g. Custom font support, hyphenation engines, and adjustable line spacing.
* **E-Ink Driver Refinement:** E.g. Reducing full-screen flashes (ghosting management) and improving general rendering.
* **Library Management:** E.g. Simple, intuitive ways to organize and navigate a collection of books.
* **Local Transfer:** E.g. Simple, "pull" based book loading via a basic web-server or public and widely-used standards.
* **Language Support:** E.g. Support for multiple languages both in the reader and in the interfaces.
* **Reference Tools:** E.g. Local dictionary lookup. Providing quick, offline definitions to enhance comprehension
without breaking focus.
### Out-of-Scope
*These items are rejected because they compromise the device's stability or mission.*
* **Interactive Apps:** No Notepads, Calculators, or Games. This is a reader, not a PDA.
* **Active Connectivity:** No RSS readers, News aggregators, or Web browsers. Background Wi-Fi tasks drain the battery
and complicate the single-core CPU's execution.
* **Media Playback:** No Audio players or Audio-books.
* **Complex Annotation:** No typed out notes. These features are better suited for devices with better input
capabilities and more powerful chips.
### In-scope — Technically Unsupported
*These features align with CrossPoint's goals but are impractical on the current hardware or produce poor UX.*
* **Clock Display:** The ESP32-C3's RTC drifts significantly during deep sleep; making the clock untrustworthy after any sleep cycle. NTP sync could help, but CrossPoint doesn't connect to the internet on every boot.
* **PDF Rendering:** PDFs are fixed-layout documents, so rendering them requires displaying pages as images rather than reflowable text — resulting in constant panning and zooming that makes for a poor reading experience on e-ink.
## 3. Idea Evaluation
While I appreciate the desire to add new and exciting features to CrossPoint Reader, CrossPoint Reader is designed to be
a lightweight, reliable, and performant e-reader. Things which distract or compromise the device's core mission will not
be accepted. As a guiding question, consider if your idea improve the "core reading experience" for the average user,
and, critically, not distract from that reading experience.
> **Note to Contributors:** If you are unsure if your idea fits the scope, please open a **Discussion** before you start
> coding!
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# CrossPoint User Guide
Welcome to the **CrossPoint** firmware. This guide outlines the hardware controls, navigation, and reading features of the device.
- [CrossPoint User Guide](#crosspoint-user-guide)
- [1. Hardware Overview](#1-hardware-overview)
- [Button Layout](#button-layout)
- [2. Power \& Startup](#2-power--startup)
- [Power On / Off](#power-on--off)
- [First Launch](#first-launch)
- [3. Screens](#3-screens)
- [3.1 Home Screen](#31-home-screen)
- [3.2 Reading Mode](#32-reading-mode)
- [3.3 Browse Files Screen](#33-browse-files-screen)
- [3.4 Recent Books Screen](#34-recent-books-screen)
- [3.5 File Transfer Screen](#35-file-transfer-screen)
- [3.5.1 Calibre Wireless Transfers](#351-calibre-wireless-transfers)
- [3.6 Settings](#36-settings)
- [3.6.1 Display](#361-display)
- [3.6.2 Reader](#362-reader)
- [3.6.3 Controls](#363-controls)
- [3.6.4 System](#364-system)
- [3.6.5 OPDS Servers (Multiple Libraries)](#365-opds-servers-multiple-libraries)
- [3.6.6 Web Settings (WiFi + OPDS)](#366-web-settings-wifi--opds)
- [3.6.7 KOReader Sync Quick Setup](#367-koreader-sync-quick-setup)
- [3.7 Sleep Screen](#37-sleep-screen)
- [4. Reading Mode](#4-reading-mode)
- [Page Turning](#page-turning)
- [Chapter Navigation](#chapter-navigation)
- [System Navigation](#system-navigation)
- [Supported Languages](#supported-languages)
- [5. Chapter Selection Screen](#5-chapter-selection-screen)
- [6. Current Limitations \& Roadmap](#6-current-limitations--roadmap)
- [7. Troubleshooting Issues \& Escaping Bootloop](#7-troubleshooting-issues--escaping-bootloop)
## 1. Hardware Overview
The device utilises the standard buttons on the Xteink X4 (in the same layout as the manufacturer firmware, by default):
### Button Layout
| Location | Buttons |
| --------------- | ---------------------------------------------------- |
| **Bottom Edge** | **Back**, **Confirm**, **Left**, **Right** |
| **Right Side** | **Power**, **Volume Up**, **Volume Down**, **Reset** |
Button layout can be customized in the **[Controls Settings](#363-controls)**.
### Taking a Screenshot
When the Power Button and Volume Down button are pressed at the same time, it will take a screenshot and save it in the folder `screenshots/`.
Alternatively, while reading a book, press the **Confirm** button to open the reader menu and select **Take screenshot**.
---
## 2. Power & Startup
### Power On / Off
To turn the device on or off, **press and hold the Power button for approximately half a second**.
In the **[Controls Settings](#363-controls)** you can configure the power button to turn the device off with a short press instead of a long one.
To reboot the device (for example after a firmware update or if it's frozen), press and release the Reset button, and then quickly press and hold the Power button for a few seconds.
### First Launch
Upon turning the device on for the first time, you will be placed on the **[Home](#31-home-screen)** screen.
> [!NOTE]
> On subsequent restarts, the firmware will automatically reopen the last book you were reading.
---
## 3. Screens
### 3.1 Home Screen
The Home screen is the main entry point to the firmware. From here you can navigate to **[Reading Mode](#4-reading-mode)** with the most recently read book, the **[Browse Files](#33-browse-files-screen)** screen, the **[Recent Books](#34-recent-books-screen)** screen, the **[File Transfer](#35-file-transfer-screen)** screen, or **[Settings](#36-settings)**.
### 3.2 Reading Mode
See [Reading Mode](#4-reading-mode) below for more information.
### 3.3 Browse Files Screen
The Browse Files screen acts as a file and folder browser.
* **Navigate List:** Use **Left** (or **Volume Up**), or **Right** (or **Volume Down**) to move the selection cursor up and down through folders and books. You can also long-press these buttons to scroll a full page up or down.
* **Open Selection:** Press **Confirm** to open a folder or read a selected book.
* **Delete Files:** Hold and release **Confirm** to delete the selected file. You will be given an option to either confirm or cancel deletion. Folder deletion is not supported.
### 3.4 Recent Books Screen
The Recent Books screen lists the most recently opened books in a chronological view, displaying title and author.
### 3.5 File Transfer Screen
The File Transfer screen allows you to upload new e-books to the device. When you enter the screen, you'll be prompted with a WiFi selection dialog and then your X4 will start hosting a web server.
See the [webserver docs](./docs/webserver.md) for more information on how to connect to the web server and upload files.
> [!TIP]
> Advanced users can also manage files programmatically or via the command line using `curl`. See the [webserver docs](./docs/webserver.md) for details.
### 3.5.1 Calibre Wireless Transfers
CrossPoint supports sending books from Calibre using the CrossPoint Reader device plugin.
1. Install the plugin in Calibre:
- Head to https://github.com/crosspoint-reader/calibre-plugins/releases to download the latest version of the crosspoint_reader plugin.
- Download the zip file.
- Open Calibre → Preferences → Plugins → Load plugin from file → Select the zip file.
2. On the device: File Transfer → Connect to Calibre → Join a network.
3. Make sure your computer is on the same WiFi network.
4. In Calibre, click "Send to device" to transfer books.
### 3.6 Settings
The Settings screen allows you to configure the device's behavior. There are a few settings you can adjust:
#### 3.6.1 Display
- **Sleep Screen**: Which sleep screen to display when the device sleeps:
- "Dark" (default) - The default dark Crosspoint logo sleep screen
- "Light" - The same default sleep screen, on a white background
- "Custom" - Custom images from the SD card; see [Sleep Screen](#37-sleep-screen) below for more information
- "Cover" - The book cover image (Note: this is experimental and may not work as expected)
- "None" - A blank screen
- "Cover + Custom" - The book cover image, falls back to "Custom" behavior
- **Sleep Screen Cover Mode**: How to display the book cover when "Cover" sleep screen is selected:
- "Fit" (default) - Scale the image down to fit centered on the screen, padding with white borders as necessary
- "Crop" - Scale the image down and crop as necessary to try to fill the screen (Note: this is experimental and may not work as expected)
- **Sleep Screen Cover Filter**: What filter will be applied to the book cover when "Cover" sleep screen is selected:
- "None" (default) - The cover image will be converted to a grayscale image and displayed as it is
- "Contrast" - The image will be displayed as a black & white image without grayscale conversion
- "Inverted" - The image will be inverted as in white & black and will be displayed without grayscale conversion
- **Status Bar**: Configure the status bar displayed while reading:
- "None" - No status bar
- "No Progress" - Show status bar without reading progress
- "Full w/ Percentage" - Show status bar with book progress (as percentage)
- "Full w/ Book Bar" - Show status bar with book progress (as bar)
- "Book Bar Only" - Show book progress (as bar)
- "Full w/ Chapter Bar" - Show status bar with chapter progress (as bar)
- **Hide Battery %**: Configure where to suppress the battery percentage display in the status bar; the battery icon will still be shown:
- "Never" (default) - Always show battery percentage
- "In Reader" - Show battery percentage everywhere except in reading mode
- "Always" - Always hide battery percentage
- **Refresh Frequency**: Set how often the screen does a full refresh while reading to reduce ghosting; options are every 1, 5, 10, 15, or 30 pages.
- **UI Theme**: Set which UI theme to use:
- "Classic" - The original Crosspoint theme
- "Lyra" - The new theme for Crosspoint featuring rounded elements and menu icons
- "Lyra Extended" - Lyra, but displays 3 books instead of 1 on the **[Home Screen](#31-home-screen)**
- **Sunlight Fading Fix**: Configure whether to enable a software-fix for the issue where white X4 models may fade when used in direct sunlight:
- "OFF" (default) - Disable the fix
- "ON" - Enable the fix
#### 3.6.2 Reader
- **Reader Font Family**: Choose the font used for reading:
- "Bookerly" (default) - Amazon's reading font
- "Noto Sans" - Google's sans-serif font
- "Open Dyslexic" - Font designed for readers with dyslexia
- **Reader Font Size**: Adjust the text size for reading; options are "Small", "Medium" (default), "Large", or "X Large".
- **Reader Line Spacing**: Adjust the spacing between lines; options are "Tight", "Normal" (default), or "Wide".
- **Reader Screen Margin**: Controls the screen margins in Reading Mode between 5 and 40 pixels in 5-pixel increments.
- **Reader Paragraph Alignment**: Set the alignment of paragraphs; options are "Justified" (default), "Left", "Center", or "Right".
- **Embedded Style**: Whether to use the EPUB file's embedded HTML and CSS stylisation and formatting; options are "ON" or "OFF".
- **Hyphenation**: Whether to hyphenate text in Reading Mode; options are "ON" or "OFF".
- **Reading Orientation**: Set the screen orientation for reading EPUB files:
- "Portrait" (default) - Standard portrait orientation
- "Landscape CW" - Landscape, rotated clockwise
- "Inverted" - Portrait, upside down
- "Landscape CCW" - Landscape, rotated counter-clockwise
- **Extra Paragraph Spacing**: Set how to handle paragraph breaks:
- "ON" - Vertical space will be added between paragraphs in Reading Mode
- "OFF" - Paragraphs will not have vertical space added, but will have first-line indentation
- **Text Anti-Aliasing**: Whether to show smooth grey edges (anti-aliasing) on text in reading mode. Note this slows down page turns slightly.
#### 3.6.3 Controls
- **Remap Front Buttons**: A menu for customising the function of each bottom edge button.
- **Side Button Layout (reader)**: Swap the order of the up and down volume buttons from "Prev/Next" (default) to "Next/Prev". This change is only in effect when reading.
- **Long-press Chapter Skip**: Set whether long-pressing page turn buttons skips to the next/previous chapter:
- "Chapter Skip" (default) - Long-pressing skips to next/previous chapter
- "Page Scroll" - Long-pressing scrolls a page up/down
- **Short Power Button Click**: Controls the effect of a short click of the power button:
- "Ignore" (default) - Require a long press to turn off the device
- "Sleep" - A short press puts the device into sleep mode
- "Page Turn" - A short press in reading mode turns to the next page; a long press turns the device off
#### 3.6.4 System
- **Time to Sleep**: Set the duration of inactivity before the device automatically goes to sleep; options are 1, 5, 10 (default), 15 or 30 minutes.
- **WiFi Networks**: Connect to WiFi networks for file transfers and firmware updates.
- **KOReader Sync**: Options for setting up KOReader for syncing book progress.
- **OPDS Servers**: Manage one or more OPDS libraries for browsing and downloading books. See [OPDS Servers (Multiple Libraries)](#365-opds-servers-multiple-libraries) below.
- **Clear Reading Cache**: Clear the internal SD card cache.
- **Check for updates**: Check for Crosspoint firmware updates over WiFi.
- **Language**: Set the system language (see **[Supported Languages](#supported-languages)** for more information).
#### 3.6.5 OPDS Servers (Multiple Libraries)
CrossPoint supports saving multiple OPDS servers and switching between them when browsing catalogs.
1. Open **Settings -> System -> OPDS Servers**.
2. Select **Add Server** to create a new entry, or select an existing server to edit it.
3. Configure these fields:
- **Server Name**: Optional display name (for example, "Home Calibre" or "Public Catalog").
- **OPDS Server URL**: Full catalog root URL (for Calibre Content Server, usually ends with `/opds`).
- **Username / Password**: Optional credentials for authenticated servers.
4. Use **Delete Server** inside a server entry to remove it.
Behavior notes:
- You can store up to 8 OPDS servers.
- OPDS authentication supports HTTP Basic auth. If you use Calibre Content Server with authentication enabled, set it to Basic (not Digest).
You can also manage OPDS servers from the web interface while in File Transfer mode:
1. Connect to the device web UI.
2. Open `http://<device-ip>/settings`.
3. Use the **OPDS Servers** card to add, edit, or delete entries.
For web-based WiFi network management, see [Web Settings (WiFi + OPDS)](#366-web-settings-wifi--opds).
#### 3.6.6 Web Settings (WiFi + OPDS)
While in **File Transfer** mode, the web settings page includes management cards for both **WiFi Networks** and **OPDS Servers**.
1. On device: open **File Transfer** and connect to WiFi.
1. In a browser, open `http://<device-ip>/settings` or `http://crosspoint.local`.
1. In **WiFi Networks**, add, edit, or delete saved network entries (SSID + optional password).
1. In **OPDS Servers**, add, edit, or delete OPDS catalogs.
Behavior notes:
- Passwords are never shown back in the web UI after saving.
- Leaving Password blank while editing keeps the existing saved password unchanged.
- The web UI can save hidden-network SSIDs, but connecting to hidden networks still depends on device-side WiFi connection flow.
#### 3.6.7 KOReader Sync Quick Setup
CrossPoint can sync reading progress with KOReader-compatible sync servers.
It also interoperates with KOReader apps/devices when they use the same server and credentials.
##### Option A: Free Public Server (`sync.koreader.rocks`)
1. Register a user once (only if needed):
```bash
USERNAME="user"
PASSWORD="pass"
PASSWORD_MD5="$(printf '%s' "$PASSWORD" | openssl md5 | awk '{print $2}')"
curl -i "https://sync.koreader.rocks/users/create" \
-H "Accept: application/vnd.koreader.v1+json" \
-H "Content-Type: application/json" \
--data "{\"username\":\"$USERNAME\",\"password\":\"$PASSWORD_MD5\"}"
```
Already have KOReader Sync credentials? Skip registration; basic sync only requires using the same existing username/password on all devices.
When this returns `HTTP 402` with `{"code":2002,"message":"Username is already registered."}`, pick a different username or use that existing account.
2. On each CrossPoint device:
- Go to **Settings -> System -> KOReader Sync**.
- Set **Username** and **Password** (enter the plain password; CrossPoint computes MD5 internally, and use the same values on all devices).
- Set **Sync Server URL** to `https://sync.koreader.rocks`, or leave it empty (both use the same default KOReader sync server).
- Run **Authenticate**.
3. While reading, press **Confirm** to open the reader menu, then select **Sync Progress**.
- Choose **Apply Remote** to jump to remote progress.
- Choose **Upload Local** to push current progress.
##### Option B: Self-Hosted Server (Docker Compose)
1. Start a sync server:
```bash
mkdir -p kosync-quickstart
cd kosync-quickstart
cat > compose.yaml <<'YAML'
services:
kosync:
image: koreader/kosync:latest
ports:
- "7200:7200"
- "17200:17200"
volumes:
- ./data/redis:/var/lib/redis
environment:
- ENABLE_USER_REGISTRATION=true
restart: unless-stopped
YAML
# Docker
docker compose up -d
# Podman (alternative)
podman compose up -d
```
> [!NOTE]
> `ENABLE_USER_REGISTRATION=true` is convenient for first setup. After creating your users, set it to `false` (or remove it) to avoid unexpected registrations.
2. Verify the server:
```bash
curl -H "Accept: application/vnd.koreader.v1+json" "http://<server-ip>:17200/healthcheck"
# Expected: {"state":"OK"}
```
3. Register a user once.
CrossPoint authenticates against KOReader Sync (`koreader/kosync`) using an MD5 key, so register using the MD5 of your password:
> [!WARNING]
> Sending a reusable MD5-derived password over plain HTTP is insecure.
> Create unique sync-only credentials and do not reuse main account passwords.
> Prefer `https://<server-ip>:7200` whenever traffic leaves a fully trusted LAN or when using untrusted networks.
> Use `curl -k` only for self-signed certificate testing.
```bash
USERNAME="user"
PASSWORD="pass"
PASSWORD_MD5="$(printf '%s' "$PASSWORD" | openssl md5 | awk '{print $2}')"
curl -i "http://<server-ip>:17200/users/create" \
-H "Accept: application/vnd.koreader.v1+json" \
-H "Content-Type: application/json" \
--data "{\"username\":\"$USERNAME\",\"password\":\"$PASSWORD_MD5\"}"
```
If this returns `HTTP 402` with `{"code":2002,"message":"Username is already registered."}`, the account already exists.
4. On each CrossPoint device:
- Go to **Settings -> System -> KOReader Sync**.
- Set **Username** and **Password** (enter the plain password; CrossPoint computes MD5 internally, and use the same values on all devices).
- Set **Sync Server URL** to `http://<server-ip>:17200`.
- Run **Authenticate**.
If you use the HTTPS listener, use `https://<server-ip>:7200` (`curl -k` only for self-signed certificate testing).
5. While reading, press **Confirm** to open the reader menu, then select **Sync Progress**.
- Choose **Apply Remote** to jump to remote progress.
- Choose **Upload Local** to push current progress.
### 3.7 Sleep Screen
The **Sleep Screen** setting controls what is displayed when the device goes to sleep:
| Mode | Behavior |
|------|----------|
| **Dark** (default) | The CrossPoint logo on a dark background. |
| **Light** | The CrossPoint logo on a white background. |
| **Custom** | A custom image from the SD card (see below). Falls back to **Dark** if no custom image is found. |
| **Cover** | The cover of the currently open book. Falls back to **Dark** if no book is open. |
| **Cover + Custom** | The cover of the currently open book. Falls back to **Custom** behavior if no book is open. |
| **None** | A blank screen. |
#### Cover settings
When using **Cover** or **Cover + Custom**, two additional settings apply:
- **Sleep Screen Cover Mode**: **Fit** (scale to fit, white borders) or **Crop** (scale and crop to fill the screen).
- **Sleep Screen Cover Filter**: **None** (grayscale), **Contrast** (black & white), or **Inverted** (inverted black & white).
#### Custom images
To use custom sleep images, set the sleep screen mode to **Custom** or **Cover + Custom**, then place images on the SD card:
- **Multiple Images (recommended):** Create a `.sleep` directory in the root of the SD card and place any number of `.bmp` images inside. One will be randomly selected each time the device sleeps. (A directory named `sleep` is also accepted as a fallback.)
- **Single Image:** Place a file named `sleep.bmp` in the root directory. This is used as a fallback if no valid images are found in the `.sleep`/`sleep` directory.
> [!TIP]
> For best results:
> - Use uncompressed BMP files with 24-bit color depth
> - Use a resolution of 480x800 pixels to match the device's screen resolution.
---
## 4. Reading Mode
Once you have opened a book, the button layout changes to facilitate reading.
### Page Turning
| Action | Buttons |
| ----------------- | ------------------------------------ |
| **Previous Page** | Press **Left** _or_ **Volume Up** |
| **Next Page** | Press **Right** _or_ **Volume Down** |
The role of the volume (side) buttons can be swapped in the **[Controls Settings](#363-controls)**.
If the **Short Power Button Click** setting is set to "Page Turn", you can also turn to the next page by briefly pressing the Power button.
### Chapter Navigation
* **Next Chapter:** Press and **hold** the **Right** (or **Volume Down**) button briefly, then release.
* **Previous Chapter:** Press and **hold** the **Left** (or **Volume Up**) button briefly, then release.
This feature can be disabled in the **[Controls Settings](#363-controls)** to help avoid changing chapters by mistake.
### System Navigation
* **Return to Home:** Press the **Back** button to close the book and return to the **[Home](#31-home-screen)** screen.
* **Return to Browse Files:** Press and hold the **Back** button to close the book and return to the **[Browse Files](#33-browse-files-screen)** screen.
* **Chapter Menu:** Press **Confirm** to open the **[Table of Contents/Chapter Selection](#5-chapter-selection-screen)** screen.
### Supported Languages
CrossPoint renders text using the following Unicode character blocks, enabling support for a wide range of languages:
* **Latin Script (Basic, Supplement, Extended-A):** Covers English, German, French, Spanish, Portuguese, Italian, Dutch, Swedish, Norwegian, Danish, Finnish, Polish, Czech, Hungarian, Romanian, Slovak, Slovenian, Turkish, and others.
* **Cyrillic Script (Standard and Extended):** Covers Russian, Ukrainian, Belarusian, Bulgarian, Serbian, Macedonian, Kazakh, Kyrgyz, Mongolian, and others.
What is not supported: Chinese, Japanese, Korean, Vietnamese, Hebrew, Arabic, Greek and Farsi.
---
## 5. Chapter Selection Screen
Accessible by pressing **Confirm** while inside a book.
1. Use **Left** (or **Volume Up**), or **Right** (or **Volume Down**) to highlight the desired chapter.
2. Press **Confirm** to jump to that chapter.
3. *Alternatively, press **Back** to cancel and return to your current page.*
---
## 6. Current Limitations & Roadmap
Please note that this firmware is currently in active development. The following features are **not yet supported** but are planned for future updates:
* **Images:** Embedded images in e-books will not render.
* **Cover Images:** Large cover images embedded into EPUB require several seconds (~10s for ~2000 pixel tall image) to convert for sleep screen and home screen thumbnail. Consider optimizing the EPUB with e.g. https://github.com/bigbag/epub-to-xtc-converter to speed this up.
---
## 7. Troubleshooting Issues & Escaping Bootloop
If an issue or crash is encountered while using Crosspoint, feel free to raise an issue ticket and attach the serial monitor logs. The logs can be obtained by connecting the device to a computer and starting a serial monitor. Either [Serial Monitor](https://www.serialmonitor.org/) or the following command can be used:
```
pio device monitor
```
If the device is stuck in a bootloop, press and release the Reset button. Then, press and hold on to the configured Back button and the Power Button to boot to the Home Screen.
There can be issues with broken cache or config. In this case, delete the `.crosspoint` directory on your SD card (or consider deleting only `settings.json`, `state.json`, or `epub_*` cache directories in the `.crosspoint/` folder).
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