Raspberry pi3 TFT screen setup

Question

EDIT: This is the the screen I bought

This is my first post here so I hope I do not screw up too much...

I have a raspberry pi3 with 3.5inch tft resistive touchscreen display (720x480) connected via SPI (GPIO pins).

I would like to use it for a project, but the problem is that the screen is too small and windows cant fit inside. I need to fit at least 1280x720 (1920x1080 would be better) into a 720x480 screen.

The screen is installed using this repository and I have already tried things mentioned in this post. I am currently at a loss for what to try next. I will also attach my current /boot/config.txt file, to make it easier to explain what to do.

Thanks in advance for any tips and suggestions.

my /boot/config.txt file:

# For more options and information see
# http://www.raspberrypi.org/documentation/configuration/config-txt.md
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
disable_overscan=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
framebuffer_width=1920
framebuffer_height=1080

# uncomment if hdmi display is not detected and composite is being output
hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (this will force VGA)
hdmi_group=2
hdmi_mode=82
hdmi_cvt=1024 720 60 1 0 0 0

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
arm_freq=800

# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
#dtparam=i2s=on
dtparam=spi=on
enable_uart=1
# Uncomment this to enable the lirc-rpi module
#dtoverlay=lirc-rpi

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
dtparam=audio=on
dtoverlay=tft35a
#dtoverlay=ads7846,cs=1,penirq=17,penirq_pull=2,speed=1000000,keep_vref_on=1,swapxy=1,pmax=255,xohms=60,xmin=200,xmax=3900,ymin=200,ymax=3900
dtoverlay=vc4-kms-v3d

Answer 1

This looks promising: https://www.raspberrypi.org/forums/viewtopic.php?t=143581

The screen in your link uses a XPT2046 chip. Seems that this line is required in the /boot/config.txt file:

dtoverlay=ads7846,penirq=25,speed=10000,penirq_pull=2,xohms=150

The parameters for the framebuffer (width and height) could be a problem, try commenting them out by adding a # in the first position of each line, then the default will be chosen automatically.

Hopefully it will work, my screen is ordered, so I have not yet had a chance to test this.