LCD 480x320

I got this LCD 480×320 HDMI and it works.

But it is recognized as 32V3H-H6A 1920×1080 which looks not good.

The closest offered resolution is 720×480 which looks o.k.

Is there a way to set the native resolution?

https://www.waveshare.com/3.5inch-hdmi-lcd.htm

This may help: I had an Adafruit 5" HDMI display touch screen with absolute coordinate mouse.

The first tricky thing was getting the ‘CONFIG.TXT’ file correct for the 800×480 display:

fake_vsync_isr=1
framebuffer_swap=0
gpu_mem=48
hdmi_force_hotplug=1
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_cvt 800 480 60 6 0 0 0
max_usb_current=1
init_emmc_clock=100000000
arm_freq=1000
gpu_freq=300
core_freq=400
sdram_freq=450
force_turbo=1
kernel=RISCOS.IMG

Hopefully it is possible by hacking the config.txt or using something like Anymode.

However, you’d probably want to do some maths in MakeModes to get an idea on clock rate for such a low-res mode. HDMI has a minimum clock of 25,000 hz which (very roughly) equates to 640×480 at 60hz, so getting lower can require some jiggery pokery with mode timings. I know I’ve had trouble doing 640×256 and lower (Mode 12/15 and lower), but Pi / AnyMode is general a lot more flexible at getting results with low resolutions.

How successful you’ll be will depend on the hardware in question.

For 480 × 320 you will find difficulty as it is not a standard CVT timing.

The Adafruit LCD touchscreen does not do EDID and the setting has to be correct for it to display the video signal. The manufacturer recommended the config.txt settings. It works with RISC OS as the touchscreen appears as an absolute coordinate mouse via USB.