FL-notes-epaper.txt

#deployment 

sudo apt-get install python3-dev

cd ~/workspace-waveshare/e-Paper/RaspberryPi_JetsonNano/python
pip install -e . 
pip install spidev
pip install gpiozero
pip install lgpio
pip install psutil
pip install Pillow
pip install smbus

https://www.waveshare.com/wiki/2.13inch_Touch_e-Paper_HAT_Manual#python


# touch lib (TP_lib, in fact only needs this l-- both display and touch ) 
cd ~/workspace-waveshare/example/python
python setup.py develop
# if for root, has to be 
sudo python setup.py develop

"TP lib" is a nweer version

python3 -m venv myenv
pip install numpy
pip install spidev
pip install gpiozero

# partial, focus on touch features
cd ~/workspace-waveshare/Touch_e-Paper_Code
source ~/workspace-waveshare/Touch_e-Paper_Code/env-pi.sh
python3 python/examples/TP2in13_V4_test.py



cd /home/orangepi/workspace-rwkv/RWKV-LM/rwkv/pi-epaper-demo
source env-pi.sh
export RWKV_NEON_ON=0
python3 pi-demo0-opi.py

# better ex, from ePaper repo
https://github.com/waveshareteam/e-Paper/blob/master/RaspberryPi_JetsonNano/python/examples/epd_2in13_V4_test.py

sudo python3 epd_2in13_V4_test.py

####################################
# orange pi
# conclusion -- use root. otherwise super tedious
#   b/c wiringOP needs /dev/mem, which requires root. 
(change permission on /dev/mem wont work; it seems kernel enforces the restriction)

sudo su
source env-pi.sh 
python3 pi-demo.py

better use root from the beginning (as the manual indicates

permission problem /dev/spiXXX
https://chatgpt.com/share/6727e6ab-ac00-8004-a825-3ac41d3e16db
it's owned by group "root". make it owned by "spi"

sudo groupadd spi
sudo usermod -aG spi $(whoami)


sudo nano /etc/udev/rules.d/99-spidev.rules
# add
KERNEL=="spidev*", GROUP="spi", MODE="0660"
sudo udevadm control --reload-rules
sudo udevadm trigger

<CANNOT DO THIS> pip3 install wiringpi
must build from source, which is much newer (4.0.2)
cf "3.21. How to install and use wiringOP-Python" manual pp 166

# check
python3 -c "import wiringpi; help(wiringpi)"

python3 -c "import wiringpi; \
from wiringpi import GPIO; wiringpi.wiringPiSetup() ; \
wiringpi.pinMode(2, GPIO.OUTPUT) ; "

####################################

displayPartBaseImage(buffer):

This function is used to display the base image for partial updates. It takes a
buffer (usually created using epd.getbuffer()) that contains the initial content
of the image you want to display

displayPartial(buffer):
used to update only a part of the display instead of refreshing the entire screen, which



ref: 
Floyd-Steinberg (dithering algo
https://www.waveshare.com/wiki/E-Paper_Floyd-Steinberg

pwnagotchi
https://github.com/evilsocket/pwnagotchi
https://www.waveshare.com/wiki/Template:2.13inch_e-Paper_HAT%2B_Pwn