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Old 08-14-2019, 05:08 AM   #1
louigi600
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3.5Inch RPi Display


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 ?
 
Old 08-14-2019, 11:16 PM   #2
louigi600
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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.

Last edited by louigi600; 08-14-2019 at 11:50 PM.
 
Old 08-15-2019, 06:56 AM   #3
louigi600
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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
Code:
/sbin/modprobe spi_bcm2835
Add this line to the end of /boot/config.txt
Code:
dtoverlay=piscreen,speed=16000000
Reboot the rpi and you should already see /dev/fb1

Modify /etc/X11/xorg.conf.d/xorg.conf to look like this:
Code:
Section "Device"
        Identifier      "Allwinner A10/A13 FBDEV"
        Driver          "fbturbo"
        Option          "fbdev" "/dev/fb1"

        Option          "SwapbuffersWait" "true"
EndSection
Add a line like this to xinitrc before the window manager is started (for example in /etc/X11/xinit/xinitrc.blackbox)
Code:
xinput set-prop 'ADS7846 Touchscreen' 'Coordinate Transformation Matrix' 1 0 0 0 -1 1 0 0 1
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 ?

Last edited by louigi600; 08-15-2019 at 07:03 AM.
 
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Old 08-16-2019, 07:59 PM   #4
glorsplitz
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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?
 
Old 08-18-2019, 02:54 AM   #5
louigi600
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Quote:
Originally Posted by glorsplitz View Post
I find this interesting, thanks for posting. Uses the whole gpio?
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.

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

How about you post some video of it action?
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).
 
Old 08-18-2019, 10:51 AM   #6
glorsplitz
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Quote:
8 physical buttons with LEDs setup and use python to make virtual buttons
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.
 
Old 08-19-2019, 07:52 AM   #7
louigi600
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Quote:
Originally Posted by glorsplitz View Post
and what are they for?
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).

Quote:
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.
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.
 
  


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