Waveshare 4 inch HDMI LCD display for Raspberry Pi Quick Start - Append to /boot/config.txt

config.txt

# Display Monitor Timings - DMT 
hdmi_group=2

# CVT (coordinated video timings)
hdmi_mode=87
 
# hdmi_cvt=<width> <height> <framerate> <aspect> <margins> <interlace> <rb>
## width	(required)	width in pixels
## height	(required)	height in pixels
## framerate	(required)	framerate in Hz
## aspect	1=4:3, 2=14:9, 3=16:9 (default), 4=5:4, 5=16:10, 6=15:9
## margins 0=margins disabled (default), 1=margins enabled
## interlace 0=progressive (default), 1=interlaced
## rb	0=normal (default), 1=reduced blanking
hdmi_cvt 480 800 60 6 0 0 0

# For Touch screen
dtoverlay=ads7846,cs=1,penirq=25,penirq_pull=2,speed=50000,keep_vref_on=0,swapxy=0,pmax=255,xohms=150,xmin=200,xmax=3900,ymin=200,ymax=3900

# Rotates 90 degrees
# Use 2 or 0 for vertical, but rest will be need to be changedas 800x480
display_rotate=3

BIG NOTE the dtoverlay will make it so you cannot use your spidev or any use of the SPI ports