Venus OS Large not working with Waveshare HDMI 4" Touch Display

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paulm asked Jun 28, '22

Venus OS Large not working with Waveshare HDMI 4" Touch Display

I have Venus OS 2.87 running on a Raspberry Pi3 with a Waveshare HDMI 4" 800 x 480 Touch Display from Pi-Hut with no problems. It's set up according to the Waveshare instructions by adding ....

hdmi_mode=87
hdmi_cvt 480 800 60 6 0 0 0
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
display_rotate=3

... to the end of the /boot/config.txt file and renaming '/etc/venus/headless'. The touch display isn't configured (yet).

I've tried the same setup on Venus OS Large 2.90~14, in order to make use of Node-Red, but all I get are multicoloured horizontal lines on the display. The remote LAN display in my browser is also rotated 90 deg clockwise. I haven't tried VRM. I can restore the remote display in my browser by using 'display_rotate=2' but had no luck with getting the Waveshare display working with Venus OS Large.

Is the underlying Raspberry Pi OS different between versions ??

PaulM

Venus OS Raspberry Pi hdmi

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Modifications Space

Node Red Space

Answer 1 · 2022-07-03T19:55:47Z

jaap-spies answered · Jul 03, 2022 at 07:55 PM

First, Venus OS is not Raspberry Pi OS!

I don't have a Waveshare 4" touchscreen montor, but I had simular problems with a simular touchscreen from AliExpress: http://www.lcdwiki.com/4inch_HDMI_Display-C

The product parameters are almost the same. You can't use the install scripts because they are specific for Raspberry Pi, but reading the script MPI4008-show you can see what is needed in config.txt

[jaap@vrede ~]$ ssh root@192.168.178.103
root@192.168.178.103's password:
Last login: Sat Jul 2 16:18:22 2022 from 192.168.178.17
root@raspberrypi4:~# ls
LCD-show         LCD-show.tar.gz
root@raspberrypi4:~# cd /u-boot/
root@raspberrypi4:/u-boot# cat config.txt
enable_uart=1
kernel=u-boot.bin

[all]
device_tree=bcm2711-rpi-4-b.dtb
hdmi_force_hotplug=1
hdmi_force_edid_audio=1
dtparam=i2c_arm=on
dtparam=spi=on
display_rotate=3
config_hdmi_boost=7
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
hdmi_drive=2
hdmi_cvt 480 800 60 6 0 0 0
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
root@raspberrypi4:/u-boot#

This works for me (almost). Touching the label 'Pages' does not work!

I'll open a question on this.

20220626-2140452.jpg (840.7 KiB)

20220703-214206.jpg (1.6 MiB)

20220703-214451.jpg (1.6 MiB)

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Answer 2 · 2022-07-04T03:33:23Z

kevgermany answered · Jul 04, 2022 at 03:33 AM

@PaulM

Better here in modifications

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Answer 3 · 2022-07-04T09:30:56Z

jaap-spies answered · Jul 04, 2022 at 09:30 AM

@kevgermany

I don't understand the move to modifications. Since the problem is related to the way venus os works on a Raspberry Pi. The RPi's don't have a BIOS, so coupling basic hardware such as a screen has to be done in the so called 'config.txt'.

I suggest reading:

https://www.raspberrypi.com/documentation/computers/config_txt.html

Please have patience with me. I'm new here :-)

1

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kevgermany ♦♦ commented · Jul 04, 2022 at 11:03 AM

Hi Jaap

Pi related questions should be in modifications.

Take a quick look at the guidelines:

https://community.victronenergy.com/questions/5889/new-victron-community-guidelines.html

Sorry, but I don't have the Pi knowledge to help. But there will, hopefully, be a Pi expert there who can help. But less likely in Q&A

0 ·

Answer 4 · 2022-07-04T16:29:16Z

paulm answered · Jul 04, 2022 at 04:29 PM

Many thanks, that works perfectly :-) I'm not using the touchscreen at present.

My comment re Raspios - the waveshare display works, as supplied, with Debian Buster based OS but not with Debian Bullseye. I guess that's the difference between Venus OS and Venus OS Large ?

Regards

PaulM

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Answer 5 · 2023-01-14T14:05:56Z

an1uk answered · Jan 14, 2023 at 02:05 PM

Considering buying this display. Does the backlight dimming/off and screen off features work?

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