Has anyone played with the 3.5 inch touchscreen display for Raspberry PI on Slackware ARM ?

Just to make sure we are talking about the same LCD: Geekcreit® 3.5 Inch 320 X 480 TFT LCD Display Touch Board For Raspberry Pi 3 Model B RPI 2B B+
https://www.banggood.com/3_5-Inch-32...p-1023432.html

I found some howtos but they are for rasbian
http://www.plastibots.com/wordpress/...Pi-Elecrow.pdf

Anyone got it to work on Slackware ARM ?

Update: getting it to work on raspbian was actually even easier then in the document I linked on the initial post since the fbi (I'm guessing that stands for Frame Buffer on spI interface) package is now an official raspbian package. It was a matter of editing a few of files.
http://https://www.raspberrypi.org/f...c.php?t=178443
However, I have an old and cheap version (that I got way back in 2011 but never played with it), that happens to have the touchscreen with the y axis inverted: getting the touchpad to function properly took more time.

Now let's see if I can get it to work on slacwareARM.

I found this information amongst the raspbian fbi package documentation:

Code:

This is fbi, written and maintained by Gerd Hoffmann <kraxel@bytesex.org>

The original source can be found at:
        http://dl.bytesex.org/releases/fbida/

This might me a good starting point.

It turns out that it's also really easy on slackwareARM. The fbi package is not necessary as it's just for displaying images on the lcd itself.

Add the spi modules to /etc/rc.d/rc.modules.local
Add this line to the end of /boot/config.txt
Reboot the rpi and you should already see /dev/fb1

Modify /etc/X11/xorg.conf.d/xorg.conf to look like this:
Add a line like this to xinitrc before the window manager is started (for example in /etc/X11/xinit/xinitrc.blackbox)
This will rotate the touchscreen so that it matches the display (alternatively you can rotate the display in /boot/config.txt but I prefer to have the HDMI, audio jack and power pointing up).

Restart X and you should get output on the 3.5 inch lcd.

If something goes wrong (and you still have the HDMI monitor connected) pres CTRL^ALT^F1 and you get the text console to mend things without needing network access to the pi.

Does anyone know how to get the FB console also working on this display ?

2 members found this post helpful.

I find this interesting, thanks for posting. Uses the whole gpio?

That was a lot of people buying it and giving good reviews.

How about you post some video of it action?

No it only uses 26 of the 40 pins. Yo will probably have to use a cut down HDU cable to get the the wires out from under the display if you want to use any remaining gpio pins.

Not much to see I run blackbox as WM and the display itself is only 480x320 (most applications don't fit properly o such a small screen ... I had a picture but my photo-bucket account if already oversize.
In any case for me it was interesting because I'm thinking of getting rid of the 8 physical buttons with LEDs setup and use python to make virtual buttons on the display: this will cost a much bigger footprint on storage but much less manual work to have it work (soldering, making holes for the buttons and leds ... etc).

and what are they for?

I'm asking because I got sata port multiplier and it has LED header for the hard drives, I wanted to connect LED but whenever I connect one it's constantly on, I suspect maybe because it needs a resistor to limit the voltage, it does flicker when there is activity, I don't know anything about resistors other than to get a few different ones and keep trying till I find one that looks like it works.

They are connected to the GPIO so they do whatever I programmed them to do
In my case I use them for:

• shutdown
• enabling remote admin from internet
• nothing currently
• managing usb port 1 (onboard ethernet on RPi2)
• managing usb port 2
• managing usb port 2
• managing usb port 4
• managing usb port 5

I know it's relatively safe to unplug usb dongle anytime but doing that would not take care of other actions that would need to happen (for instance unpluging a wifi dongle bridged with some other interface). Its a lot of work to do that (soldering, wiring making holes on the case and writing code to manage the actions you want to happen).

What Hardware is that sata multiplexer connected to ? (unless you are talking about Annapurna Labs SBC it's probably not even ARM based CPU)
I really doubt you will have much control over the leds on the sata multiplexer unless they get seen by the system as connected to GPIO ports.

I found this artcle and i managed to get the fbcon to show up on the lcd screen, but I've not yet found a way to invert on of the exes on the touchscreen.

Essentially the article says to put ths at the beginning of your cmdline.txt
the rotation seems not to work though.