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README.md
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README.md
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### ePaper library for ESP32
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# LilyBook - ePaper Reader for ESP32
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---
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Ebook reader firmware designed for LilyGO T5 v2.4 (ESP32 with 2.9" eInk display).
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## How to build
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#### Features
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* Support for **GDEH029A1** / **SSD1608** based ePaper modules in 4-wire SPI mode. Support for other controllers will be added later
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* **emulated** 4-bit gray scale mode
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* **SPI displays oriented SPI driver library** based on *spi-master* driver
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* Combined **DMA SPI** transfer mode and **direct SPI** for maximal speed
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* **4-bit Grayscale mode** or **1-bit b/w mode** can be selected during runtime
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* SPI speeds up to **20 MHz** are tested and works without problems
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* **Demo application** included which demonstrates most of the library features
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* **Graphics drawing functions**:
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* **EPD_drawPixel** Draw pixel at given x,y coordinates
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* **EPD_drawLine** Draw line between two points
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* **EPD_drawFastVLine**, **EPD_drawFastHLine** Draw vertical or horizontal line of given lenght
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* **EPD_drawLineByAngle** Draw line on screen from (x,y) point at given angle
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* **EPD_drawRect**, **EPD_fillRect** Draw rectangle on screen or fill given rectangular screen region with color
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* **EPD_drawRoundRect**, **EPD_fillRoundRect** Draw rectangle on screen or fill given rectangular screen region with color with rounded corners
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* **EPD_drawCircle**, **EPD_fillCircle** Draw or fill circle on screen
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* **EPD_drawEllipse**, **EPD_fillEllipse** Draw or fill ellipse on screen
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* **EPD_drawTriangel**, **EPD_fillTriangle** Draw or fill triangle on screen
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* **EPD_drawArc** Draw circle arc on screen, from ~ to given angles, with given thickness. Can be outlined with different color
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* **EPD_drawPolygon** Draw poligon on screen with given number of sides (3~60). Can be outlined with different color and rotated by given angle.
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* **Fonts**:
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* **fixed** width and proportional fonts are supported; 8 fonts embeded
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* unlimited number of **fonts from file**
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* **7-segment vector font** with variable width/height is included (only numbers and few characters)
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* Proportional fonts can be used in fixed width mode.
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* Related functions:
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* **EPD_setFont** Set current font from one of embeded fonts or font file
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* **EPD_getfontsize** Returns current font height & width in pixels.
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* **EPD_getfontheight** Returns current font height in pixels.
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* **set_7seg_font_atrib** Set atributes for 7 segment vector font
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* **getFontCharacters** Get all font's characters to buffer
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* **String write function**:
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* **EPD_print** Write text to display.
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* Strings can be printed at **any angle**. Rotation of the displayed text depends on *font_ratate* variable (0~360)
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* if *font_transparent* variable is set to 1, no background pixels will be printed
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* If the text does not fit the screen/window width it will be clipped ( if *text_wrap=0* ), or continued on next line ( if *text_wrap=1* )
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* Two special characters are allowed in strings: *\r* CR (0x0D), clears the display to EOL, *\n* LF (ox0A), continues to the new line, x=0
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* Special values can be entered for X position:
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* *CENTER* centers the text
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* *RIGHT* right justifies the text horizontaly
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* *LASTX* continues from last X position; offset can be used: *LASTX+n*
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* Special values can be entered for Y:
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* *CENTER* centers the text verticaly
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* *BOTTOM* bottom justifies the text
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* *LASTY* continues from last Y position; offset can be used: *LASTY+n*
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* **EPD_getStringWidth** Returns the string width in pixels based on current font characteristics. Useful for positioning strings on the screen.
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* **EPD_clearStringRect** Fills the rectangle occupied by string with current background color
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* **Images**:
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* **EPD_jpg_image** Decodes and displays JPG images
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* Limits:
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* Baseline only. Progressive and Lossless JPEG format are not supported.
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* Image size: Up to 65520 x 65520 pixels
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* Color space: YCbCr three components only. Gray scale image is not supported.
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* Sampling factor: 4:4:4, 4:2:2 or 4:2:0.
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* Can display the image **from file** or **memory buffer**
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* Image can be **scaled** by factor 0 ~ 3 (1/1, 1/2, 1/4 or 1/8)
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* Image is displayed from X,Y position on screen/window:
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* X: image left position; constants CENTER & RIGHT can be used; *negative* value is accepted
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* Y: image top position; constants CENTER & BOTTOM can be used; *negative* value is accepted
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* Image is converted to **4-bit Gray Scale mode**
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* **Other display functions**:
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* **EPD_fillScreen** Fill the whole screen with black, white or gray scale
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* **compile_font_file** Function which compiles font c source file to font file which can be used in *EPD_setFont()* function to select external font. Created file have the same name as source file and extension *.fnt*
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* **Global wariables**
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* **orientation** current screen orientation
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* **font_ratate** current font rotate angle (0~395)
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* **font_transparent** if not 0 draw fonts transparent
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* **font_forceFixed** if not zero force drawing proportional fonts with fixed width
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* **text_wrap** if not 0 wrap long text to the new line, else clip
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* **_fg** current foreground color for fonts
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* **_bg** current background for non transparent fonts
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* **_angleOffset** angle offset for arc, polygon and line by angle functions
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* **image_debug** print debug messages during image decode if set to 1
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* **cfont** Currently used font structure
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* **EPD_X** X position of the next character after EPD_print() function
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* **EPD_Y** Y position of the next character after EPD_print() function
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* **_gs** use 4-bit Gray scale if set to 1
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* **_width** screen width (larger dimension) in pixels
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* **_height** screen height (smaller dimension) in pixels
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---
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Full functions **syntax and descriptions** can be found in *EPD.h* and *EPDspi.h* files.
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Full **demo application**, well documented, is included, please **analyze it** to learn how to use the library functions.
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---
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#### Connecting the display
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To run the demo, attach display module to ESP32. Default pins used are:
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* mosi: 23
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* sck: 18
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* CS: 5 (display CS)
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* DC: 26 (display DC)
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* RST: 27 (display RESET)
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* BUSY: 32 (display BUSY output)
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The display can be powered from 3.3V or from **GPIO pin**. See *EPDspi.h* for configuration options.
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**If you want to use different pins, change them in** *EPDspi.h*
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Using *make menuconfig* **select tick rate 1000** ( → Component config → FreeRTOS → Tick rate (Hz) ) to get more accurate timings
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---
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#### How to build
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Configure your esp32 build environment as for **esp-idf examples**
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Configure your esp32 build environment as for [**esp-idf examples**](https://docs.espressif.com/projects/esp-idf/en/stable/get-started/)
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Clone the repository
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`git clone https://github.com/loboris/ESP32_ePaper_example.git`
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`git clone https://github.com/Dejvino/lilybook.git`
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Execute menuconfig and configure your Serial flash config and other settings. Included *sdkconfig.defaults* sets some defaults to be used.
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Navigate to **ePaper Display DEMO Configuration** and set **SPIFFS** options.
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Select if you want to use **wifi** (recommended) to get the time from **NTP** server and set your WiFi SSID and password.
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`make menuconfig`
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Make and flash the example.
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Make and flash the firmware.
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`make all && make flash`
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---
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Optionally run a serial output monitor to see debug messages.
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#### Prepare **SPIFFS** image
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`make monitor`
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*The demo uses some image and font files and it is necessary to flash the spiffs image*
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**To flash already prepared image** *components/spiffs_image/spiffs_image.img* execute:
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`make copyfs`
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Note: pres `CTRL + ]` to exit the monitor.
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---
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You can also prepare different SFPIFFS **image** and flash it to ESP32.
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Files to be included on spiffs are already in **components/spiffs_image/image/** directory. You can add or remove the files you want to include.
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Then execute:
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`make makefs`
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to create **spiffs image** in *build* directory **without flashing** to ESP32
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Or execute:
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`make flashfs`
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to create **spiffs image** in *build* directory and **flash** it to ESP32
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---
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Tested on Waveshare 2.9" ePaper module connected to SparkFun ESP32 Thing board.
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---
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## Built Thanks To
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* Display Driver: https://github.com/loboris/ESP32_ePaper_example
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* SD Card Sample: https://github.com/espressif/esp-idf/tree/master/examples/storage/sd_card
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* Pinout: https://github.com/Xinyuan-LilyGO/T5-Ink-Screen-Series
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