====== e-Ink - ePaper 2.13 Inch Screen ======
===== General instruction =====

    * See also in this wiki: [[e-ink_display|E-Ink Display]]

  * [[https://www.waveshare.com/wiki/2.13inch_e-Paper_HAT#Raspberry_Pi]]
  * Data sheet: see programming/...
  * Overview of all GPIO connections [[sensor_link_overview|Sensor Connection Overview]]
===== Hardware connection=====

If the board you get is the HAT version like 2.13inch e-Paper HAT, you can directly attach it on the 40PIN GPIO of Raspberry Pi. Or you can wire ti to Raspberry Pi with 8PIN cable.

Connect to Raspberry Pi

{{:epaper_pin-connection_2019-10.jpg?nolink&600|}}

{{:2.13_inch_e-ink_display_pins.jpg?nolink&400|}}

{{:2.13_inch_e-ink_display_pins_meening.jpg?nolink&400|}}


<code/>sudo raspi-config
Choose Interfacing Options -> SPI -> Yes  to enable SPI interface
</code>

===== Pi Configuration - Software =====
  * wiringPi
  * BCM2835 (source: [[http://www.airspayce.com/mikem/bcm2835/]])
  * python
  * example code


==== WiringPi ====
<code/>
sudo apt-get install wiringpi

#For Pi 4, you need to update it：
cd /tmp
wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v
#You will get 2.52 information if you install it correctly
</code>

==== BCM2835  ====

  * Downloadpath [[https://www.airspayce.com/mikem/bcm2835/]]
  * Further information [[http://groups.google.com/group/bcm2835]]

<code/>
# download the latest version of the library, say bcm2835-1.xx.tar.gz, then:
tar zxvf bcm2835-1.xx.tar.gz
cd bcm2835-1.xx
./configure
make
sudo make check
sudo make install
</code>

==== Python====
<code/>
#python2
sudo apt-get update
sudo apt-get install python-pip
sudo apt-get install python-pil
sudo apt-get install python-numpy
sudo pip install RPi.GPIO
sudo pip install spidev
#python3
sudo apt-get update
sudo apt-get install python3-pip
sudo apt-get install python3-pil
sudo apt-get install python3-numpy
sudo pip3 install RPi.GPIO
sudo pip3 install spidev


</code>

==== Examples====
<code/>
sudo git clone https://github.com/waveshare/e-Paper
cd e-Paper/RaspberryPi\&JetsonNano/
</code>

<code/>
cd python/examples
# python2
sudo python xxx.py
# python3
sudo python3 xxx.py
</code>

===== Check Configuration and setup =====
==== SPI ====
<code/>
sudo pigpiod
pi@raspberrypi:~ $ pigs spio 0 50000 0
0
pi@raspberrypi:~ $ pigs spix 0 10 20 30 40 50
5 10 20 30 40 50
pi@raspberrypi:~ $ pigs spix 0 10 20 30 40 50
5 10 20 30 40 50
pi@raspberrypi:~ $ pigs spix 0 10 20 30 40 50
5 0 0 0 0 0
pi@raspberrypi:~ $ pigs spix 0 10 20 30 40 50
5 10 20 30 40 50
</code>

If the pins are connected, it returns the same result as passed in the command, if the disconnect get zeros. Is this a compiled application with an error or missing rights?