Setup

SD Card

Add the wpa_supplicant.conf file to the boot drive with:

country=US
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
ssid="WIFI_SSID"
scan_ssid=1
psk="WIFI_PASSWORD"
key_mgmt=WPA-PSK
}

Additionally you need to uncomment the spi line in config.txt as well as add the ssh file.

Libraries

BCM2835

wget http://www.airspayce.com/mikem/bcm2835/bcm2835-1.70.tar.gz
tar zxvf bcm2835-1.70.tar.gz 
cd bcm2835-1.70/
sudo ./configure
sudo make
sudo make check
sudo make install

WiringPi is needed on Pi4

wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb
gpio -v

Grab examples

sudo apt-get install p7zip-full python3-pip python3-pil python3-numpy
sudo pip3 install RPi.GPIO
sudo pip3 install spidev
sudo pip3 install picamera
sudo wget  https://www.waveshare.net/w/upload/a/a8/LCD_Module_RPI_code.7z
7z x LCD_Module_RPI_code.7z -O./LCD_Module_code

Python

Just some sample code snips for ref

Camera

## PiCamera 
from time import sleep
from picamera import PiCamera  

camera = PiCamera()
camera.resolution = (240, 240)  

camera.capture("camera.bmp")
camera.close()

2.5 Snippet

import os
import sys
import time
import logging
import spidev as SPI
from picamera import PiCamera
sys.path.append("..")
from lib import LCD_2inch4
from PIL import Image,ImageDraw,ImageFont

# Raspberry Pi pin configuration:
RST = 27
DC = 25
BL = 18
bus = 0
device = 0

camera = PiCamera()
camera.resolution = (240, 320)

camera.capture("camera.bmp")
camera.close()

disp = LCD_2inch4.LCD_2inch4()
disp.Init()
disp.clear()

image1 = Image.new("RGB", (disp.width, disp.height), "WHITE")
draw = ImageDraw.Draw(image1)

image = Image.open('camera.bmp')
disp.ShowImage(image)
time.sleep(3)
disp.module_exit()
exit()

1.54 Demo

## 1inch54
import os
import sys
import time
import logging
import spidev as SPI
sys.path.append("..")
from lib import LCD_1inch54
from PIL import Image,ImageDraw,ImageFont

# Raspberry Pi pin configuration:
RST = 27
DC = 25
BL = 18
bus = 0
device = 0
logging.basicConfig(level=logging.DEBUG)
try:
    # display with hardware SPI:
    ''' Warning!!!Don't  creation of multiple displayer objects!!! '''
    #disp = LCD_1inch54.LCD_1inch54(spi=SPI.SpiDev(bus, device),spi_freq=10000000,rst=RST,dc=DC,bl=BL)
    disp = LCD_1inch54.LCD_1inch54()
    # Initialize library.
    disp.Init()
    # Clear display.
    disp.clear()

    # Create blank image for drawing.
    image1 = Image.new("RGB", (disp.width, disp.height), "WHITE")
    draw = ImageDraw.Draw(image1)

    logging.info("draw point")

    draw.rectangle((5,10,6,11), fill = "BLACK")
    draw.rectangle((5,25,7,27), fill = "BLACK")
    draw.rectangle((5,40,8,43), fill = "BLACK")
    draw.rectangle((5,55,9,59), fill = "BLACK")

    logging.info("draw line")
    draw.line([(20, 10),(70, 60)], fill = "RED",width = 1)
    draw.line([(70, 10),(20, 60)], fill = "RED",width = 1)
    draw.line([(170,15),(170,55)], fill = "RED",width = 1)
    draw.line([(150,35),(190,35)], fill = "RED",width = 1)

    logging.info("draw rectangle")

    draw.rectangle([(20,10),(70,60)],fill = "WHITE",outline="BLUE")
    draw.rectangle([(85,10),(130,60)],fill = "BLUE")

    logging.info("draw circle")
    draw.arc((150,15,190,55),0, 360, fill =(0,255,0))
    draw.ellipse((150,65,190,105), fill = (0,255,0))

    logging.info("draw text")
    Font1 = ImageFont.truetype("../Font/Font01.ttf",25)
    Font2 = ImageFont.truetype("../Font/Font01.ttf",35)
    Font3 = ImageFont.truetype("../Font/Font02.ttf",32)

    draw.rectangle([(0,65),(140,100)],fill = "WHITE")
    draw.text((5, 68), 'Hello world', fill = "BLACK",font=Font1)
    draw.rectangle([(0,115),(190,160)],fill = "RED")
    draw.text((5, 118), 'WaveShare', fill = "WHITE",font=Font2)
    draw.text((5, 160), '1234567890', fill = "GREEN",font=Font3)
    text= u"微雪电子"
    draw.text((5, 200),text, fill = "BLUE",font=Font3)
    im_r=image1.rotate(270)
    disp.ShowImage(im_r)
    time.sleep(3)
    logging.info("show image")
    image = Image.open('../pic/LCD_1inch54.jpg')
    im_r=image.rotate(270)
    disp.ShowImage(im_r)
    time.sleep(3)
    disp.module_exit()
    logging.info("quit:")
except IOError as e:
    logging.info(e)
except KeyboardInterrupt:
    disp.module_exit()
    logging.info("quit:")
    exit()

2.4 Attempt

## 2.4inch
import os
import sys
import time
import io
import picamera
import logging
import socketserver
from threading import Condition
import spidev as SPI
sys.path.append("..")
from lib import LCD_2inch4
from PIL import Image,ImageDraw,ImageFont

# Raspberry Pi pin configuration:
RST = 27
DC = 25
BL = 18
bus = 0
device = 0

disp = LCD_2inch4.LCD_2inch4()

class StreamingOutput(object):
    def __init__(self):
        self.frame = None
        self.buffer = io.BytesIO()
        self.condition = Condition()

    def write(self, buf):
        if buf.startswith(b'\xff\xd8'):
            # New frame, copy the existing buffer's content and notify all
            # clients it's available
            self.buffer.truncate()
            with self.condition:
                self.frame = self.buffer.getvalue()
                self.condition.notify_all()
            self.buffer.seek(0)
        return self.buffer.write(buf)

with picamera.PiCamera(resolution='240x320', framerate=30) as camera:
    output = StreamingOutput()
    camera.start_recording(output, format='mjpeg')
    try:
		disp.Init()
		disp.clear()
		time.sleep(30)
    finally:
        camera.stop_recording()
		disp.module_exit()
		exit()

Ref