View source for 2.7inch e-Paper HAT

{{Product|
|images=
[[File:2.7inch-e-Paper-1.jpg|300px|link=https://{{SERVERNAME}}/2.7inch-e-Paper.htm]]

264x176, 2.7inch E-Ink display raw panel

[[File:2.7inch-e-paper-hat-3.jpg|300px|link=http://{{SERVERNAME}}/2.7inch-e-paper-hat.htm]]

264x176, 2.7inch E-Ink display HAT for Raspberry Pi, SPI interface
|categories=[[:Category:OLEDs / LCDs|OLEDs / LCDs]], [[:Category:LCD|LCD]]
|brand=Waveshare
|interfaces={{Category|SPI}}
}}
= Introduction =
{{E-Paper Raw Panel}}
264x176, 2.7inch E-Ink display HAT for Raspberry Pi, SPI interface

= Interfaces =
{|class="wikitable"
|-
| VCC || 3.3V 
|-
| GND || GND
|-
| DIN || SPI MOSI 
|-
| CLK || SPI SCK
|-
| CS || SPI chip select (Low active)
|-
| DC || Data/Command control pin (High for data, and low for command)
|-
| RST || External reset pin (Low for reset)
|-
| BUSY || Busy state output pin (Low for busy)
|}
= Working principle =
;Introduction 
----
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 suspending 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. ('''Note that the e-Paper cannot support updating directly under sunlight''')
; Communication protocol 
----
[[File:1.54inch-e-paper-manual-1.png|400px]]
Note: Different from the traditional SPI protocol, the data line from the slave to the master is hidden since the device only has display requirement. 
* 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. 
SPI communication has data transfer timing, which is combined by CPHA and CPOL. 
# CPOL determines the level of the serial synchronous clock at idle state. When CPOL = 0, the level is Low. However, CPOL has little effect to the transmission.
# CPHA determines whether data is collected at the first clock edge or at the second clock edge of serial synchronous clock; when CPHL = 0, data is collected at the first clock edge.
* There are 4 SPI communication modes. SPI0 is commonly used, in which CPHL = 0, CPOL = 0.
As you can see from the figure above, data transmission starts at the first falling edge of SCLK, and 8 bits of data are transferred in one clock cycle. In here, SPI0 is in used, and data is transferred by bits, MSB first.
{{Hardware/Software setting for SPI e-paper}}
{{e-Paper Codes Description}}
 VCM DC setting -> VCOM and data interval setting -> Send command data start transmission 1 -> Send data of an white image (send 0xFF 5808 times) -> Send command data start transmission 2 -> Send data of an image to display -> Refresh the screen.
Note:
* You have to send a white frame before the frame to display.
* 1 byte = 8 pixels, doesn’t support Gray scale (Can only display black and white). A bit set stands for a white pixel, otherwise a bit reset stands for black.
For example：
0xC3：8 pixels □□■■■■□□
0x00：8 pixels ■■■■■■■■
0xFF：8 pixels □□□□□□□□
0x66：8 pixels ■□□■■□□■
* This module doesn’t support partial refresh.
* The refresh rate of this module is slow, and it will flicker for several times during refreshing (about 6s). Please be patient.
-->

== Resources ==
= Documentation =
*[https://{{SERVERNAME}}/en/w/upload/3/31/2.7inch_e-paper_hat_user_manual_en.pdf User Manual]
{{Commom Instruction of SPI e-paper}}
* [[:File:2.7inch_e-Paper_HAT_Schematic.pdf|Schematic]]
= Demo code =
*[https://github.com/waveshare/e-Paper Github]
= Datasheets =
* [[:File:2.7inch-e-paper-Specification.pdf|Datasheets]]
=Related Resources=
This is a post in Arduino Form about our SPI e-Paper thanks to ZinggJM, maybe you want to refer to.
*[https://forum.arduino.cc/index.php?topic=487007.0 Waveshare e-Paper display with SPI]
Thanks to Rane Wallin, who make this Tutorial and share to us.
*[https://dev.to/ranewallin/getting-started-with-the-waveshare-2-7-epaper-hat-on-raspberry-pi-41m8 Getting started with the 2.7inch e-Paper HAT on Raspeberry Pi]

== FAQ ==
= FAQ =

== FAQ ==
{{e-Paper FAQ}}

==Support==
{{Service}}