Modify for 52x52 LED Panel

#1

Editing like a boss, I mean I figured it out already using the panel mapping.
adding :

const PanelMappingEntry defaultPanelMap[] =
{
{0, 3, 13},
{0, 19, 13},
{0, 0, 0} // last entry is all zeros
};

did work… however, I noticed there is a small problem.
if I compile

{0, 0, DEFAULT_PANEL_WIDTH_FOR_LINEAR_PANELS},
{0, 0, 0} // last entry is all zeros
I will get the normal image like the image downbelow.
then I compile with the change I did above, then it normally displays.
(see post 1 below)
after a powercycle the Teensy 3.1 it messes up the entire image.
(see post 2 below)

To get it back I have to change the panel mapping with “DEFAULT_PANEL_WIDTH_FOR_LINEAR_PANELS” and change it back to my value’s.
Is this normal?

Thanks,
Appelza

old.

Hello,
First, I really appreciate your great work!

Second, I recently grabbed a LED Panel from the dumpster which has 52x52 pixels on there. I hooked it up like the HUB75 panels, but the mapping seems not to be right.
I need to skip 3 pixels every 13 horzontal pixels.
The shift register they used has 16outputs, but they left 3 outputs unconnected to have 52pixels in total. (same as in vertical rows, but I could easily change that in the code from 16 to 13)
what lines do I need to add/modify?

backgroundLayer.drawLine(63, 0, 0, 31, white);
backgroundLayer.drawLine(63, 31, 0, 0, white);

ezed
ezed.jpg1063×598 268 KB

Thanks!
Appelza

#2

1
1.jpg706×395 133 KB

#3

Sorry, I don’t know what DEFAULT_PANEL_WIDTH_FOR_LINEAR_PANELS is, and it doesn’t sound normal but I don’t understand the issue fully.

#4

I had some trouble with posting/editing my first post, and seems like the post did not came thru.
However I couldn’t fix the issue (glitching after restart on the teensy3) So I’ve moved over to the ESP32 using also the teensylc branch.

I tried to modify the code to 52x52 output, but it was more worse, esp32 wont even show anything…
So I just leave it at 64x64 and do my own skipping 3 pixel code when receiving stuff from my PC. (since I wanted to receive data from a PC anyway instead using a SDCard or selfmade graphics on arduino)

It partially works for now, streaming video on WiFi!


If interested, I could share the code aswell.

As for the DEFAULT_PANEL_WIDTH_FOR_LINEAR_PANELS, its in the SmartMatrixPanelMaps.cpp file.
but I just leave that alone for this panel that i’m using.

Thanks,
Appelza

(my english isn’t that great)

#5

The PanelMapping code is pretty new, and seems like it still has some issues. Glad you got something working.

I opened a GitHub issue to track the after-reboot issue on the Teensy: https://github.com/pixelmatix/SmartMatrix/issues/83

I’d love to see your code if you have time to share.

I was searching in the wrong branch, and didn’t realize it was in my code, sorry about that.

#6

It’s been a while again, however I’ve put my code/modifcations on my github.

I also happened to get some other LED panels from the dump, as for a complete module its 104x52, (with calibration eeprom on their boards), opening this module appears to be a 2 times 52x52 again. However the mapping seems to be very different this time. See pic,

I debugged it with some shiftout function from arduino, it seems its like a large message board like 256x7 at max(after 64 it wraps up at the beginning again, wrapped in 4 colums, the screen has ABCD, however only ABC is useable.
I noticed SmartMatrix doesnt work like that way. Where do I have to look into the code? lets say, to change the clock signal to output 256times instead of 128 times, since my screen is also only 6 and 7 high, is there a way to change this?
I tried to play with the modscan stuff, but only resulting crashing the device.

Waiting for a reply from someone, thanks!

#7

You might need to set SmartMatrix to a higher resolution than your panel, to account for the unused pixels that are interleaved with the useful pixels.