Difference between revisions of "2.13inch e-Paper HAT"

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(→‎SPI timing)
(→‎SPI timing)
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[[File:e-paper-spi-timing.jpg|700px]]
 
[[File:e-paper-spi-timing.jpg|700px]]
  
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The e-Paper could only support writing, therefore the MISO pin is hidden.
+
The e-Paper only supports writing, therefore the MISO pin is hidden.
  
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*CS is slave chip select. When CS is low, the chip is enabled.
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CS is slave chip select, when CS is low, the chip is enabled.<br />
−
*DC is data/command control pin, when DC = 0, write command, when DC = 1, write data.
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DC is data/command control pin, when DC = 0, write command, when DC = 1, write data.<br />
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*SCLK is the SPI communication clock.
+
SCLK is the SPI communication clock.<br />
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*SDIN is the data line from the master to the slave in SPI communication.
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SDIN is the data line from the master to the slave in SPI communication.<br />
 
Timing：CPHL=0， CPOL=0 （SPI0）<br />
 
Timing：CPHL=0， CPOL=0 （SPI0）<br />
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【Note】For more information of the SPI, please search online.
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【Note】You can search more documents of SPI bus online.
  
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==墨水屏刷新原理==
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==Working protocol==
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===像素与字节的关系===
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===Pixel & Byte===
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对于黑白图片，我们可以规定，如果如果是黑色我们定义成0，如果是白色就定义成1，那么有了表示颜色的方式：<br />
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We define the pixels in a monochrome picture, 0 is black and 1 is white.<br />
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白色：□，对应1<br />
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White：□，Bit 1<br />
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黑色：■：对应0<br />
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Black：■：Bit 0<br />
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*一个点在图形上一般称之为像素点（pixel）,而颜色不是1就是0，也就是1个位就可以标识颜色：1Pixel = 1bit，那么一个字节里面就包含了8个像素点。<br />
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*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<br />
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*以16个像素点为例，我们假设前8个像素点为黑，后8个像素点为白色，那么可以这么认为，像素点1-16，对应这0位到15位，0表示黑色，1表示白色：<br />
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*For example, If we set first 8 pixels to black and the last 8 pixels to white, we show it by codes, they will be 16 bit as below:<br />
 
[[file:e-paper_hardware_work_1.png]]<br />
 
[[file:e-paper_hardware_work_1.png]]<br />
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对于计算机而言，它的数据存储方式是高位在前，低位在后，且一个字节只有8个位，因此会有一点改变：<br />
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For computer, the data is saved in MSB format:<br />
 
[[file:e-paper_hardware_work_2.png]]<br />
 
[[file:e-paper_hardware_work_2.png]]<br />
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这样只需要2个字节即可表示16个像素点了。<br />
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So we can use two bytes for 16 pixels.<br />
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==使用说明==
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==User Guides==
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*[[E-paper for RPi Use|树莓派使用说明]]
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*[[E-paper for RPi Use|Raspberry Pi User Guide]]
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*[[E-paper for Jetsonnano Use|Jetson Nano使用说明]]
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*[[E-paper for Jetsonnano Use|Jetson Nano User Guide]]
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*[[E-paper for STM32 Use|STM32使用说明]]
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*[[E-paper for STM32 Use|STM32 User Guide]]
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*[[E-paper for Arduino Use|Arduino使用说明]]
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*[[E-paper for Arduino Use|Arduino User Guide]]
  
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==资料==
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==Resources==
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===文档===
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===Document===
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*[http://47.107.148.244/w/images/5/57/2.13inch_e-Paper_HAT_Schematic.pdf 原理图]<br>
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*[http://47.107.148.244/w/images/5/57/2.13inch_e-Paper_HAT_Schematic.pdf Schematic]<br>
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===程序===
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===Demo codes===
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*[http://47.107.148.244/w/images/5/50/E-Paper.7z 示例程序]
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*[http://47.107.148.244/w/images/5/50/E-Paper.7z Demo codes]
  
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===数据手册===
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===Datasheet===
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*[http://47.107.148.244/w/images/e/e6/2.13inch_e-Paper_Datasheet.pdf 2.13inch e-Paper数据手册]
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*[http://47.107.148.244/w/images/e/e6/2.13inch_e-Paper_Datasheet.pdf 2.13inch e-Paper Datasheet]
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===开发资料===
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<!-- ===开发资料=== -->
 
==FAQ==
 
==FAQ==
 
{{E-Paper FAQ}}
 
{{E-Paper FAQ}}

Revision as of 18:50, 5 June 2020

Introduction

This is 2.13inch e-Paper module, 250x122 resolution, SPI interface, supports black and white colors.

Features

  • Size： 2.13 inch
  • Dimension（Raw panel）：59.2mm × 29.2mm × 1.05mm
  • Dimension（PCBA）：65mmx30.2mm
  • Display area：48.55mm × 23.71mm
  • Operating voltage：3.3V/5V
  • Interface：SPI
  • Pitch：0.194* 0.194
  • Resolution：250*122
  • Display colors：Black, White
  • Gray scale：2
  • Partial update ：0.3s
  • Fully update ：2s
  • Consumption (refresh) ： 26.4mW(typ.)
  • Consumption (standby) ：<=0.017mW

【Notices】： Update time: The data provided is for reference, the actual time may be different according to the MCU. The e-Paper will flicker when updating, it is normal
Consumption: The data provided is for reference, the actual consumption may be different according to the driver board.

SPI timing

E-paper-spi-timing.jpg

The e-Paper only supports writing, therefore the MISO pin is hidden.

CS is slave chip select, when CS is low, the chip is enabled.
DC is data/command control pin, when DC = 0, write command, when DC = 1, write data.
SCLK is the SPI communication clock.
SDIN is the data line from the master to the slave in SPI communication.
Timing：CPHL=0， CPOL=0 （SPI0）
【Note】You can search more documents of SPI bus online.

Working protocol

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 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.

User Guides

Resources

Document

Demo codes

Datasheet

FAQ

1、Working requirements of e-Paper?|

  • 【Working】Temperature: 0~50°C; Humidity: 35%~65%RH
  • 【Storage】Temperature: ≤30°C; Humidity: ≤55%RH; Max storage time: 6 months
  • 【Transport】Temperature: -25~70°C; Max transport time: 10 days
  • 【Unpack】Temperature: 20°C±5°C; Humidity: 50%RH±5%RH; Max storage time: Should be assembled in 72h

2、 What do you need to note about e-Paper refreshing

  • Refresh mode
    • Full refresh: e-Paper flicker when full refreshing to remove ghost image for best display.
    • Partial refresh: It doesn't flicker if you use partial refresh (only some of the two-color e-paper support partial refresh). Note that you cannot use Partial refresh all the time, you should full refresh e-paper regularly, otherwise, ghost problem will get worse even damage
  • Refresh rate
    • When using, you should set the update interval at least 180s. (except Partial supportable types)
    • Please set the e-Paper to sleep mode or power off it directly, otherwise, the e-Paper is damaged because of working in high voltage for a long time.
    • You need to update the content of three-color e-Paper at least one time every 24h to avoid the burn-in problem.
  • Working place
    • We recommend you to use the e-Paper indoor. If you need to set the e-paper outdoor, Please place the e-paper in shadow and protect it from UV. When you designed you e-paper product, you should take care about the working situation like temperature, humidity, etc.

3、Why the e-Paper display a black frame？

  • You can configure Border Waveform Control register or VCOM AND DATA INTERVAL SETTING register to change the frame.

4、Could the e-Paper work again after sleeping？

  • You can use the initial function to wake it up and then update.
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