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Xteink-X4-crosspoint-reader/USER_GUIDE.md
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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 Book Selection](#32-book-selection)
- [3.3 Reading Mode](#33-reading-mode)
- [3.4 File Upload Screen](#34-file-upload-screen)
- [3.5 Settings](#35-settings)
- [3.6 Sleep Screen](#36-sleep-screen)
- [4. Reading Mode](#4-reading-mode)
- [Page Turning](#page-turning)
- [Chapter Navigation](#chapter-navigation)
- [System Navigation](#system-navigation)
- [5. Chapter Selection Screen](#5-chapter-selection-screen)
- [6. Current Limitations \& Roadmap](#6-current-limitations--roadmap)
## 1. Hardware Overview
The device utilises the standard buttons on the Xtink 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 **[Settings](#35-settings)**.
---
## 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 **[Settings](#35-settings)** 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 if it's frozen, or after a firmware update), 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, **[Book Selection](#32-book-selection)**, **[Settings](#35-settings)**, or the **[File Upload](#34-file-upload-screen)** screen.
### 3.2 Book Selection
The Book Selection acts as a folder and file 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.
### 3.3 Reading Mode
See [Reading Mode](#4-reading-mode) below for more information.
### 3.4 File Upload Screen
The File Upload 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.
### 3.4.1 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.
### 3.5 Settings
The Settings screen allows you to configure the device's behavior. There are a few settings you can adjust:
- **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](#36-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
- **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 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" - Show status bar with reading progress
- **Hide Battery %**: Configure where to suppress the battery pecentage display in the status bar; the battery icon will still be shown:
- "Never" - Always show battery percentage (default)
- "In Reader" - Show battery percentage everywhere except in reading mode
- "Always" - Always hide battery percentage
- **Extra Paragraph Spacing**: If enabled, vertical space will be added between paragraphs in the book. If disabled, paragraphs will not have vertical space between them, 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.
- **Short Power Button Click**: Controls the effect of a short click of the power button:
- "Ignore" - Require a long press to turn off the device
- "Sleep" - A short press powers the device off
- "Page Turn" - A short press in reading mode turns to the next page; a long press turns the device 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
- **Front Button Layout**: Configure the order of the bottom edge buttons:
- Back, Confirm, Left, Right (default)
- Left, Right, Back, Confirm
- Left, Back, Confirm, Right
- Back, Confirm, Right, Left
- **Side Button Layout (reader)**: Swap the order of the up and down volume buttons from Previous/Next to Next/Previous. This change is only in effect when reading.
- **Long-press Chapter Skip**: Set whether long-pressing page turn buttons skip to the next/previous chapter.
- "Chapter Skip" (default) - Long-pressing skips to next/previous chapter
- "Page Scroll" - Long-pressing scrolls a page up/down
- Swap the order of the up and down volume buttons from Previous/Next to Next/Previous. This change is only in effect when reading.
- **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", "Large", or "X Large".
- **Reader Line Spacing**: Adjust the spacing between lines; options are "Tight", "Normal", or "Wide".
- **Reader Screen Margin**: Controls the screen margins in reader 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".
- **Time to Sleep**: Set the duration of inactivity before the device automatically goes to sleep.
- **Refresh Frequency**: Set how often the screen does a full refresh while reading to reduce ghosting.
- **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
- **OPDS Browser**: Configure OPDS server settings for browsing and downloading books. Set the server URL (for Calibre Content Server, add `/opds` to the end), and optionally configure username and password for servers requiring authentication. Note: Only HTTP Basic authentication is supported. If using Calibre Content Server with authentication enabled, you must set it to use Basic authentication instead of the default Digest authentication.
- **Check for updates**: Check for firmware updates over WiFi.
### 3.6 Sleep Screen
You can customize the sleep screen by placing custom images in specific locations on the SD card:
- **Single Image:** Place a file named `sleep.bmp` in the root directory.
- **Multiple Images:** Create a `sleep` directory in the root of the SD card and place any number of `.bmp` images inside. If images are found in this directory, they will take priority over the `sleep.bmp` file, and one will be randomly selected each time the device sleeps.
> [!NOTE]
> You'll need to set the **Sleep Screen** setting to **Custom** in order to use these images.
> [!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 **[Settings](#35-settings)**.
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 **[Settings](#35-settings)** to help avoid changing chapters by mistake.
### System Navigation
* **Return to Book Selection:** Press **Back** to close the book and return to the **[Book Selection](#32-book-selection)** screen.
* **Return to Home:** Press and **hold** the **Back** button to close the book and return to the **[Home](#31-home-screen)** screen.
* **Chapter Menu:** Press **Confirm** to open the **[Table of Contents/Chapter Selection](#5-chapter-selection-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.
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