portsdown 2020 inverted\negative display

[m1cdq]

just building another portsdown 2020. I have just done a new card. all works but display is in negative\inverted

ive gone in via ssh and changed it to a B it wont work put back to A it works but inverted

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[m1cdq]

there seems to be some update by waveshare for the display
https://www.waveshare.net/wiki/3.5inch_RPi_LCD_(B)

[m1cdq]

i have tried this

Next step reinstalling the driver for the OLD version according to the instructions WaveShare.

git clone https://github.com/waveshare/LCD-show.git
cd LCD-show/
sudo ./LCD35B-show-V2

the colour is right but fonts too big

[G8GKQ]

There are only 2 displays supported for the Portsdown 2020: The WaveShare 3.5 inch Model A and the Official Raspberry Pi 7 inch. As stated here: https://wiki.batc.org.uk/Portsdown2019_ ... ouchScreen

The original WaveShare 3.5 inch Model B only worked because someone gave me full details of the modifications to make it work and I was able to incorporate them. If you were to do the same with the updated WaveShare B, I could incorporate the new display in the Menu. Otherwise, I suggest that you buy the correct display.

Sorry

Dave, G8GKQ

[m1cdq]

I thought I was getting the right display. seems to be a shortage of A's seems to be the New B version

going to find an A version

but what i have twiddled with playing
in the config.txt as well as the drive upgrade prev posted.
im playing in the dark as this is not what i normally do. but you dont learn unless you play

# Enable audio (loads snd_bcm2835)
dtparam=audio=on
dtoverlay=waveshare35b-v2,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=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
hdmi_force_hotplug=1
#max_usb_current=1
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_cvt 480 320 60 6 0 0 0
hdmi_drive=2
display_rotate=0

## Begin LCD Driver
dtparam=spi=on
dtoverlay=waveshare35b-v2
##dtoverlay=waveshare35a
## End LCD Driver

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