Pico e-Paper 5.65

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Pico e-Paper 5.65
Pico e-Paper 5.65

5.65inch EPD Module for Raspberry Pi Pico,
600×448,ACeP 7-Color, SPI
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Overview


This 5.65inch colorful e-Paper display module is designed for Raspberry Pi Pico, 600x448 Pixels, supports ACeP 7-Color.

Specifications

  • Dimension: 5.65inch
  • Outline dimensions(raw panel): 125.4 x 99.5mm x 0.91mm
  • Outline dimensions(driver board): 128mm x 101.5mm
  • Display Size: 114.9mm x 85.79mm
  • Operating voltage: 3.3V/5V
  • Interface: SPI
  • Dot pitch:0.1915x 0.1915
  • Display color: ACeP 7-Color
  • Resolution: 600 x 448 pixels
  • Display color: Black/White/Green/Blue/Red/Yellow/Orange
  • Full refresh time: 33s
  • Refresh power: 26.4mW (typ.)
  • Standby current: <0.01uA (almost none)

【Note】: Refresh time: The refresh time is the experimental test data, the actual refresh time will have errors, and the actual effect shall prevail. There will be a flickering effect during the global refresh process, this is a normal phenomenon Power consumption: The power consumption data is the experimental test data. The actual power consumption will have a certain error due to the existence of the driver board and the actual use situation. The actual effect shall prevail.

SPI Communication Timing

1.54inch-e-paper-manual-1.png

Since the ink screen only needs to be displayed, the data cable (MISO) sent from the machine and received by the host is hidden here.

  • CS: Slave chip select, when CS is low, the chip is enabled
  • DC: data/command control pin, write command when DC=0; write data when DC=1
  • SCLK: SPI communication clock
  • SDIN: SPI communication master sends, slave receives
  • Timing: CPHL=0, CPOL=0 (SPI0)

[Remarks] For specific information about SPI, you can search for information online.

Working principle

This product is an E-paper device adopting the image display technology of Microencapsulated Electrophoretic Display, MED. The initial approach is to create tiny spheres, in which the charged color pigments are suspended in the transparent oil and would move depending on the electronic charge. The E-paper screen display patterns by reflecting the ambient light, so it has no background light requirement. Under ambient light, the E-paper screen still has high visibility with a wide viewing angle of 180 degrees. It is the ideal choice for E-reading. (Note that the e-Paper cannot support updating directly under sunlight)

Pixel & Byte

We define the pixels in a monochrome picture, 0 is black and 1 is white.
White:□: Bit 1
Black:■: Bit 0

  • The dot in the figure is called a pixel. As we know, 1 and 0 are used to define the color, therefore we can use one bit to define the color of one pixel, and 1 byte = 8pixels
  • For example, If we set the first 8 pixels to black and the last 8 pixels to white, we show it by codes, they will be 16 bit as below:

E-paper hardware work 1.png

For computer, the data is saved in MSB format:
E-paper hardware work 2.png
So we can use two bytes for 16 pixels.

Color of e-Paper

An image is made of pixels. The sizes of every pixel defined who may color are supported by the e-Paper. Monochrome image use one bit for one pixel (0 and 1, black and white), in this case, if we want to display more colors, we should use more bits for every pixel.
You can refer to the Make BMP file for e-Paper" guide and make the image yourself for this module.
We need at least 3bits to display severe color. For easy programming, we and an 0 bit in front of it. In this case, we use 4 bits for every pixel.

Color BIN HEX The color (reference)
Black 0b0000 0x0
White 0b0001 0x1
Green 0b0010 0x2
Blue 0b0011 0x3
Red 0b0100 0x4
Yellow 0b0101 0x5
Orange 0b0110 0x6

For example, if you want to display four colors, green, yellow, red and orange, it should be like as below:

Pixel 1 2 3 4
Bit 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Data 0 0 1 0 0 1 0 1 0 1 0 0 0 1 1 0
Color

Data is saved in MSB formate and 1byte is equal to 8 bits.

Pixel 1 2 3 4
Bit 7 6 5 4 3 3 1 0 7 6 5 4 3 2 1 0
Data 0 0 1 0 0 1 0 1 0 1 0 0 0 1 1 0
Color
Byte 0x25 0x46

Precautions

  1. For the screen that supports partial update, please note that you cannot refresh the screen with the partial mode all the time. After several partial updating, you need to fully refresh the screen once. Otherwise, the screen display effect will be abnormal, which cannot be repaired!
  2. Because of the different batches, some of them have aberrations. Store the e-Paper right side up will reduce it. And if the e-Paper didn't be refreshed for a long time, it will become more and more reddish/yellowish. Please use the demo code to refresh the e-paper several times in this case.
  3. Note that the screen cannot be powered on for a long time. When the screen is not refreshed, please set the screen to sleep mode, or power off the e-Paper. Otherwise, the screen will remain in a high voltage state for a long time, which will damage the e-Paper and cannot be repaired!
  4. When using the e-Paper, it is recommended that the refresh interval be at least 180s, and refresh at least once every 24 hours. If the e-Paper is not used for a long time, the ink screen should be brushed and stored. (Refer to the datasheet for specific storage environment requirements)
  5. After the screen enters sleep mode, the sent image data will be ignored, and it can be refreshed normally only after initializing again.
  6. Control the 0x3C or 0x50 (refer to the datasheet for details) register to adjust the border color. In the routine, you can adjust the Border Waveform Control register or VCOM AND DATA INTERVAL SETTING to set the border.
  7. If you find that the created image data is displayed incorrectly on the screen, it is recommended to check whether the image size setting is correct, change the width and height settings of the image and try again.
  8. The working voltage of the e-Paper is 3.3V. If you buy the raw panel and you need to add a level convert circuit for compatibility with 5V voltage. The new version of the driver board (V2.1 and subsequent versions) has added a level processing circuit, which can support both 3.3V and 5V working environments. The old version can only support a 3.3V working environment. You can confirm the version before using it. (The one with the 20-pin chip on the PCB is generally the new version)
  9. The FPC cable of the screen is relatively fragile, pay attention to bending the cable along the horizontal direction of the screen when using it, and do not bend the cable along the vertical direction of the screen
  10. The screen of e-Paper is relatively fragile, please try to avoid dropping, bumping, and pressing hard.
  11. We recommend that customers use the sample program provided by us to test with the corresponding development board after they get the screen.

Picture Production

Provides bmp picture production for E-Paper HAT (F)

Preparation

Required software: Adobe PhotoShop CC, Painting

Introduction

  • Floyd-Steinberg dithering algorithm is very suitable for showing rich layering when color is less. More color combinations for better shadow rendering of the original image. It is especially suitable for various usage scenarios of e-ink screens.
  • The following will introduce how to convert ordinary pictures into Floyd-Steinberg scatter plots.
  • If you are interested in the actual algorithm, you can read about our algorithm porting on ESP32 link hereand ESP8266 link here

Operating Steps

Preparation:Download color sheet to PC, and unzip to get the file as shown below, we are going to use N-color.act.
Xcolor sheet.png

1.New key Photoshop project, set the width and height according to the actual resolution of the e-Paper screen, the color mode uses RGB color. The resolution of this module is 640*400. Change the width to 640 pixels and the height to 400 pixels.

Color3.png

2. Prepare the corresponding picture, copy it into the project, and adjust the parameters such as size and contrast (similar to the steps for processing pictures in general Photoshop).

Pica.png

3.Select File->Save for Web and Devices.

Pica5.png

4.Select the color table as shown below. Load the color table provided in Preparation. Pica6.png

5.For seven-color pictures, load N-color.act, then click Save and save as a gif file. Then convert it into BMP format and use it on this module.

Pica4.png

6.Open the gif file with Paint and save it as a 24-bit bmp image. Pica7.png

7.So far, the color picture available for this module has been made, and it can be put into the SD card of the Raspberry Pi or e-Paper Shield module for use.

RPi Pico


Hardware connection

Please take care of the direction when connecting Pico. A logo of USB port is printed to indicate the directory, you can aslo check the pins.
If you want to connect the board by a 8-pin cable, you can refer to the table below

e-Paper Pico Description
VCC VSYS Power input
GND GND GNd
DIN GP11 MOSI pin of SPI interface, data transmitted from Master to Slave.
CLK GP10 SCK pin of SPI interface, clock input
CS GP9 Chip select pin of SPI interface, Low active
DC GP8 Data/Command control pin (High: Data; Low: Command)
RST GP12 Reset pin, low active
BUSY GP13 Busy pin

You can just attach the board to Pico like the Pico-ePaper-2.13
Pico-ePaper-connect.jpg

Setup Environment

You can refer to the guides of Raspberry Pi: https://www.raspberrypi.org/documentation/pico/getting-started/

Download Demo codes

Open a terminal of Pi and run the following command:

sudo apt-get install p7zip-full
cd ~
sudo wget  https://www.waveshare.com/w/upload/2/27/Pico_ePaper_Code.zip
unzip Pico_ePaper_Code.zip -d Pico_ePaper_Code
cd ~/Pico_ePaper_Code

You can also clone the codes from githu

git https://github.com/waveshare/Pico_ePaper_Code
cd e-Paper/RaspberryPi_JetsonNano/

About the examples

The guides are based on Raspberry Pi.

C codes

The example provided is compatible for several types, you need to modify the main.c file, uncomment the definition according to the actual type of the display you get.
For example, if you have the Pico-ePaper-2.13, please modify the main.c file, uncomment line 18(or maybe it is line 19).
E-paper for Pico use 1.png

Build the project:

cd ~/Pico_ePaper_Code/c

Create build folder and add the SDK. ../../pico-sdk is the default path of the SDK, if you save the SDK to other directory, please change it to the actual path.

mkdir build
cd build
export PICO_SDK_PATH=../../pico-sdk

Run cmake command to generate Makefile file.

cmake ..

Run the comamnd make to compile the codes.

make -j9
  • After compiling, the epd.uf2 file is generated. Next, press and hold the BOOTSEL button on the Pico board, connect the Pico to the Raspberry Pi using the Micro USB cable, and release the button. At this point, the device will recognize a removable disk (RPI-RP2)
  • Copy the epd.uf2 file just generated to the newly recognized removable disk (RPI-RP2), Pico will automatically restart the running program

Python

  • First press and hold the BOOTSEL button on the Pico board, use the Micro USB cable to connect the Pico to the Raspberry Pi, then release the button. At this point, the device will recognize a removable disk (RPI-RP2)
  • Copy the rp2-pico-20210418-v1.15.uf2 file in the python directory to the removable disk (RPI-RP2) just identified
  • Update Thonny IDE
sudo apt upgrade thonny
  • Open Thonny IDE (click on the Raspberry logo -> Programming -> Thonny Python IDE ), and select the interpreter:
    • Select Tools -> Options... -> Interpreter
    • Select MicroPython (Raspberry Pi Pico and ttyACM0 port
  • Open the Pico_ePaper-xxx.py file in Thonny IDE, then run the current script (click the green triangle)

C Code Analysis

Bottom Hardware Interface

We package the hardware layer for easily porting to the different hardware platforms.
DEV_Config.c(.h) in the directory:Pico_ePaper_Code\c\lib\Config

  • Data type:
#define UBYTE   uint8_t
#define UWORD   uint16_t
#define UDOUBLE uint32_t
  • Module initialize and exit:
void DEV_Module_Init(void);
void DEV_Module_Exit(void);
Note:
1.The functions above are used to initialize the display or exit handle.
  • GPIO Write/Read:
void DEV_Digital_Write(UWORD Pin, UBYTE Value);
UBYTE DEV_Digital_Read(UWORD Pin);
  • SPI transmit data
void DEV_SPI_WriteByte(UBYTE Value);

EPD driver

The driver codes of EPD is saved in the directory: Pico_ePaper_Code\c\lib\e-Paper
Open the .h header file, you can check all the functions defined.

  • Initialize e-Paper, this function is always used at the beginning and after waking up the display.
//2.13inch e-Paper、2.13inch e-Paper  V2、2.13inch e-Paper (D)、2.9inch e-Paper、2.9inch e-Paper (D)
void EPD_xxx_Init(UBYTE Mode); // Mode = 0 fully update, Mode = 1 partial update
//Other types
void EPD_xxx_Init(void);

xxx should be changed by the type of e-Paper, For example, if you use 2.13inch e-Paper (D), to fully update, ti shoule be EPD_2IN13D_Init(0) and EPD_2IN13D_Init(1) for partial update;

  • Clear: this function is used to clear the display to white.
void EPD_xxx_Clear(void); 

xxx should be changed by the type of e-Paper, For example, if you use 2.9inch e-Paper (D), it should be EPD_2IN9D_Clear();

  • Send the image data (one frame) to EPD and display
//Bicolor version
void EPD_xxx_Display(UBYTE *Image);
//Tricolor version
void EPD_xxx_Display(const UBYTE *blackimage, const UBYTE *ryimage);

There are several types which are different from others

//Paritial update for 2.13inch e-paper (D)、2.9inch e-paper (D)
void EPD_2IN13D_DisplayPart(UBYTE *Image);
void EPD_2IN9D_DisplayPart(UBYTE *Image);
//For 2.13inch e-paper V2, you need to first useEPD_xxx_DisplayPartBaseImage to display a static background and then partial update by the function EPD_xxx_DisplayPart()
void EPD_2IN13_V2_DisplayPart(UBYTE *Image);
void EPD_2IN13_V2_DisplayPartBaseImage(UBYTE *Image);
  • Enter sleep mode
void EPD_xxx_Sleep(void);

Note, You should only hardware reset or use initialize function to wake up e-Paper from sleep mode
xxx is the type of e-Paper, for example, if you use 2.13inch e-Paper D, it should be EPD_2IN13D_Sleep();

Application Programming Interface

We provide basic GUI functions for testing, like draw point, line, string, and so on. The GUI function can be found in the directory: RaspberryPi_JetsonNano\c\lib\GUI\GUI_Paint.c(.h)
E-paper Driver HAT GUI.png
The fonts used can be found in directory: RaspberryPi_JetsonNano\c\lib\Fonts
E-paper Driver HAT Fonts.png

  • Create a new image, you can set the image name, width, height, rotate angle and color.
void Paint_NewImage(UBYTE *image, UWORD Width, UWORD Height, UWORD Rotate, UWORD Color)
Parameters:
 	image : Name of the image buffer, this is a pointer;
 	Width : Width of the image;
 	Height: Height of the image;
 	Rotate: Rotate angle of the Image;
 	Color : The initial color of the image;
  • Select image buffer: You can create multiple image buffers at the same time and select the certain one and drawing by this function.
void Paint_SelectImage(UBYTE *image)
Parameters:
 	image: The name of the image buffer, this is a pointer;
  • Rotate image: You need to set the rotate angle of the image, this function should be used after Paint_SelectImage(). The angle can 0, 90, 180, 270
void Paint_SetRotate(UWORD Rotate)
Parameters:
 	Rotate: Rotate angle of the image, the parameter can be ROTATE_0, ROTATE_90, ROTATE_180, ROTATE_270.
【Note】Afer rotating, the place of the first pixel is different, we take 1.54inch e-paper as example
SPI-epaper-C-0.png SPI-epaper-C-90.png SPI-epaper-C-180.pngSPI-epaper-C-270.png
  • Image mirror: This function is used to set the image mirror.
void Paint_SetMirroring(UBYTE mirror)
Parameters:
 	mirror: Mirror type if the image, the parameter can be MIRROR_NONE、MIRROR_HORIZONTAL、MIRROR_VERTICAL、MIRROR_ORIGIN.
  • Set the position and color of pixels: This is the basic function of GUI, it is used to set the position and color of a pixel in the buffer.
void Paint_SetPixel(UWORD Xpoint, UWORD Ypoint, UWORD Color)
Parameters:
 	Xpoint: The X-axis value of the point in the image buffer
 	Ypoint: The Y-axis value of the point in the image buffer
 	Color : The color of the point
  • Clear display: To set the color of the image, this function always be used to clear the display.
void Paint_Clear(UWORD Color)
Parameters:
 	Color: The color of the image
  • Color of the windows: This function is used to set the color of windows, it always used for updating partial areas like displaying a clock.
void Paint_ClearWindows(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color)
Parameters:
 	Xpoint: The X-axis value of the start point in the image buffer
 	Ypoint: The Y-axis value of the start point in the image buffer
 	Xend: The X-axis value of the end point in the image buffer
 	Yend: The Y-axis value of the end point in the image buffer
 	Color: The color of the windows
  • Draw point: Draw a point at the position (Xpoint, Ypoint) of image buffer, you can configure the color, size, and the style.
void Paint_DrawPoint(UWORD Xpoint, UWORD Ypoint, UWORD Color, DOT_PIXEL Dot_Pixel, DOT_STYLE Dot_Style)
Parameters:
 	Xpoint: X-axis value of the point.
 	Ypoint: Y-axis value of the point.
 	Color: Color of the point
 	Dot_Pixel: Size of the point, 8 sizes are available.
 	 	 typedef enum {
 	 	 	 DOT_PIXEL_1X1  = 1,	// 1 x 1
 	 	 	 DOT_PIXEL_2X2  , 		// 2 X 2
 	 	 	 DOT_PIXEL_3X3  , 	 	// 3 X 3
 	 	 	 DOT_PIXEL_4X4  , 	 	// 4 X 4
 	 	 	 DOT_PIXEL_5X5  , 		// 5 X 5
 	 	 	 DOT_PIXEL_6X6  , 		// 6 X 6
 	 	 	 DOT_PIXEL_7X7  , 		// 7 X 7
 	 	 	 DOT_PIXEL_8X8  , 		// 8 X 8
 	 	} DOT_PIXEL;
 	Dot_Style: Style of the point, it define the extednded mode of the point.
 	 	typedef enum {
 	 	   DOT_FILL_AROUND  = 1,		
 	 	   DOT_FILL_RIGHTUP,
 	 	} DOT_STYLE;
  • Draw line: Draw a lin from (Xstart, Ystart) to (Xend, Yend) in image buffer, you can configure the color, width and the style.
void Paint_DrawLine(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, LINE_STYLE Line_Style , LINE_STYLE Line_Style)
Parameters:
 	Xstart: Xstart of the line
 	Ystart: Ystart of the line
 	Xend: Xend of the line
 	Yend: Yend of the line
 	Color: Color of the line
 	Line_width: Width of the line, 8 sizes are available.
 	 	typedef enum {
 	 	 	 DOT_PIXEL_1X1  = 1,	// 1 x 1
 	 	 	 DOT_PIXEL_2X2  , 		// 2 X 2
 	 	 	 DOT_PIXEL_3X3  ,		// 3 X 3
 	 	 	 DOT_PIXEL_4X4  ,		// 4 X 4
 	 	 	 DOT_PIXEL_5X5  , 		// 5 X 5
 	 	 	 DOT_PIXEL_6X6  , 		// 6 X 6
 	 	 	 DOT_PIXEL_7X7  , 		// 7 X 7
 	 	 	 DOT_PIXEL_8X8  , 		// 8 X 8
 	 	} DOT_PIXEL;
 	 Line_Style: Style of the line, Solid or Dotted.
 	 	typedef enum {
 	 	 	 LINE_STYLE_SOLID = 0,
 	 	 	 LINE_STYLE_DOTTED,
 	 	} LINE_STYLE;
  • Draw rectangle: Draw a rectangle from (Xstart, Ystart) to (Xend, Yend) , you can configure the color, width, and style.
void Paint_DrawRectangle(UWORD Xstart, UWORD Ystart, UWORD Xend, UWORD Yend, UWORD Color, DOT_PIXEL Line_width, DRAW_FILL Draw_Fill)
Parameters:
 	Xstart: Xstart of the rectangle.
 	Ystart: Ystart of the rectangle.
 	Xend: Xend of the rectangle.
 	Yend: Yend of the rectangle.
 	Color: Color of the rectangle
 	Line_width: The width of the edges. 8 sizes are available.
 	 	typedef enum {
 	 	 	 DOT_PIXEL_1X1  = 1,	// 1 x 1
 	 	 	 DOT_PIXEL_2X2  , 		// 2 X 2
 	 	 	 DOT_PIXEL_3X3  ,		// 3 X 3
 	 	 	 DOT_PIXEL_4X4  ,		// 4 X 4
 	 	 	 DOT_PIXEL_5X5  , 		// 5 X 5
 	 	 	 DOT_PIXEL_6X6  , 		// 6 X 6
 	 	 	 DOT_PIXEL_7X7  , 		// 7 X 7
 	 	 	 DOT_PIXEL_8X8  , 		// 8 X 8
 	 	} DOT_PIXEL;
 	Draw_Fill: Style of the rectangle, empty or filled.
 	 	typedef enum {
 	 	 	 DRAW_FILL_EMPTY = 0,
 	 	 	 DRAW_FILL_FULL,
 	 	} DRAW_FILL;
  • Draw circle: Draw a circle in image buffer, use (X_Center Y_Center) as center and Radius as radius. You can configure the color, width of line and the style of circle.
void Paint_DrawCircle(UWORD X_Center, UWORD Y_Center, UWORD Radius, UWORD Color, DOT_PIXEL Line_width, DRAW_FILL Draw_Fill)
Parameters:
 	X_Center: X-axis of center
 	Y_Center: Y-axis of center
 	Radius:Radius of circle
 	Color: Color of the circle
 	Line_width: The width of arc, 8 sizes are available.
 	 	typedef enum {
 	 	 	 DOT_PIXEL_1X1  = 1,	// 1 x 1
 	 	 	 DOT_PIXEL_2X2  , 		// 2 X 2
 	 	 	 DOT_PIXEL_3X3  ,		// 3 X 3
 	 	 	 DOT_PIXEL_4X4  ,		// 4 X 4
 	 	 	 DOT_PIXEL_5X5  , 		// 5 X 5
 	 	 	 DOT_PIXEL_6X6  , 		// 6 X 6
 	 	 	 DOT_PIXEL_7X7  , 		// 7 X 7
 	 	 	 DOT_PIXEL_8X8  , 		// 8 X 8
 	 	} DOT_PIXEL;
 	Draw_Fill: Style of the circle: empty or filled.
 	 	typedef enum {
 	 	 	 DRAW_FILL_EMPTY = 0,
 	 	 	 DRAW_FILL_FULL,
 	 	} DRAW_FILL;
  • Show Ascii character: Show a characeter in (Xstart, Ystart) position, you can configure the font, foreground and the background.
void Paint_DrawChar(UWORD Xstart, UWORD Ystart, const char Ascii_Char, sFONT* Font, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
 	Xstart: Xstart of the character
 	Ystart: Ystart of the character
 	Ascii_Char:Ascii char
 	Font:  five fonts are avaialble:
 	 	font8:5*8
 	 	font12:7*12
 	 	font16:11*16
 	 	font20:14*20
 	 	font24:17*24
 	Color_Foreground: foreground color
 	Color_Background: background color
  • Draw string: Draw string at (Xstart Ystart) , you can configure the fonts, foreground and the background
void Paint_DrawString_EN(UWORD Xstart, UWORD Ystart, const char * pString, sFONT* Font, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
 	Xstart: Xstart of the string
 	Ystart: Ystart of the string
 	pString:String
 	Font: five fonts are available:
 	 	font8:5*8
 	 	font12:7*12
 	 	font16:11*16
 	 	font20:14*20
 	 	font24:17*24
 	Color_Foreground: foreground color
 	Color_Background: background color
  • Draw Chiness string: Draw Chinese string at (Xstart Ystart) of image buffer. You can configure fonts (GB2312), foreground and the background.
void Paint_DrawString_CN(UWORD Xstart, UWORD Ystart, const char * pString, cFONT* font, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
 	Xstart: Xstart of string
 	Ystart: Ystart of string
 	pString:string
 	Font: GB2312 fonts, two fonts are available  
 	 	font12CN:ascii 11*21,Chinese 16*21
 	 	font24CN:ascii 24*41,Chinese 32*41
 	Color_Foreground: Foreground color
 	Color_Background: Background color
  • Draw number: Draw numbers at (Xstart Ystart) of image buffer. You can select font, foreground and the background.
void Paint_DrawNum(UWORD Xpoint, UWORD Ypoint, int32_t Nummber, sFONT* Font, UWORD Color_Foreground, UWORD Color_Background)
Parameters:
 	Xstart: Xstart of numbers
 	Ystart: Ystart of numbers
 	Nummber:numbers displayed. It support int type and 2147483647 are the maximum supported
 	Font: Ascii fonts, five fonts are available:
 	 	font8:5*8
 	 	font12:7*12
 	 	font16:11*16
 	 	font20:14*20
 	 	font24:17*24
 	Color_Foreground: foreground
 	Color_Background: background
  • Display time: Display time at (Xstart Ystart) of image buffer, you can configure fonts, foreground, and background.
This function is used for partial update. Note that some of the e-Paper doesn't support partial update and you cannot use partial update all the time,which will cost ghots problem and destroy the display.
void Paint_DrawTime(UWORD Xstart, UWORD Ystart, PAINT_TIME *pTime, sFONT* Font, UWORD Color_Background, UWORD Color_Foreground)
Parameters:
 	Xstart: Xstart of time
 	Ystart: Ystart of time
 	pTime:Structure of time
 	Font: Ascii font, five fonts are avaialble
 	 	font8:5*8
 	 	font12:7*12
 	 	font16:11*16
 	 	font20:14*20
 	 	font24:17*24
 	Color_Foreground: foreground
 	Color_Background: background

Resource


Document

Demo codes

FAQ

 Answer:
*【Working conditions】Temperature range: 0~50°C; Humidity range: 35%~65%RH
  • 【Storage conditions】: Temperature range: below 30°C; Humidity range: below 55%RH; Maximum storage time: 6 months
  • 【Transportation conditions】: Temperature range: -25~70°C; Maximum transportation time: 10 days
  • 【After unpacking】: Temperature range: 20°C±5°C; Humidity range: 50±5%RH; Maximum storage time: Assemble within 72 hours
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 Answer:
*refresh mode
    • Full brush: The electronic ink screen will flicker several times during the refresh process (the number of flickers depends on the refresh time), and the flicker is to remove the afterimage to achieve the best display effect

Bureau brush: The electronic ink screen has no flickering effect during the refresh process. Users who use the partial brushing function note that after refreshing several times, a full brush operation should be performed to remove the residual image, otherwise the residual image problem will become more and more serious, or even damage the screen (currently only some black and white e-ink screens support partial brushing, please refer to product page description)

  • refresh rate
    • During use, it is recommended that customers set the refresh interval of the e-ink screen to at least 180 seconds (except products that support the local brush function)
    • During the standby process (that is, after the refresh operation), it is recommended that the customer set the e-ink screen to sleep mode, or power off operation (the power supply part of the ink screen can be disconnected with an analog switch) to reduce power consumption and prolong the life of the e-ink screen. (If some e-ink screens are powered on for a long time, the screen will be damaged beyond repair.)
    • During the use of the three-color e-ink screen, it is recommended that customers update the display screen at least once every 24 hours (if the screen remains the same screen for a long time, the screen burn will be difficult to repair)
  • place of use
    • The e-ink screen is recommended for indoor use. If you use it outdoors, you need to avoid direct sunlight on the e-ink screen, and take UV protection measures at the same time. When designing e-ink screen products, customers should pay attention to determine whether the use environment meets the temperature and humidity requirements of the e-ink screen
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 Answer:
The Chinese character library of our routine uses GB2312 encoding method, please change your xxx_test.c file to GB2312 encoding format, compile and download it, and then it can be displayed normally
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 Answer:
Power on the development board for a long time, after each refresh operation, it is recommended to set the screen to sleep mode or directly power off processing, otherwise the screen may burn out when the screen is in a high voltage state for a long time.
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 Answer:
The border display color can be set through the Border Waveform Control register or the VCOM AND DATA INTERVAL SETTING register.
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 Answer:
0.5mm pitch, 24Pin.
  • In this case, the customer needs to reduce the position of the round brush and clear the screen after 5 rounds of brushing (increasing the voltage of VCOM can improve the color, but it will increase the afterimage).


 Answer:
Yes, but you need to re-initialize the electronic paper with software.
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 Answer:
The process of re-awakening the e-ink screen is actually the process of re-powering on, so when the EPD wakes up, the screen must be cleared first, so as to avoid the afterimage phenomenon to the greatest extent.
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 Answer:
Yes, you can also use the IIC pin external LM75 temperature sensor
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 Answer:
It may be caused by the unsuccessful spi driver 1. Check whether the wiring is correct 2. Check whether the spi is turned on and whether the parameters are configured correctly (spi baud rate, spi mode and other parameters)
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 Answer:
Ideally, with normal use, it can be refreshed 1,000,000 times (1 million times)
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