Is it possible to display static image with 128x128 display ? (MBIxxxx driver mapping)

[antoine-nedelec]

Using:

• Raspberry pi zero
• Adafruit RGB Matrix Bonnet for Raspberry Pi

I would like to display static image on my 128x128 display.

I know that there is a refresh problem for > 64x64 displays, but I would not be bothered by laggy video.

Is it possible ? (what would I need to change in order to make it work (currently i have duplicated horizontal (0 - 63 & 64 - 127), and only displayed on 1/3 or the vertical of the display. Played with all the flags but could't yet correct the problem.

Edit 20/10:

The canvas height and width return 128, so this seems ok.

Here is the current result. I added a custom function lines that draw rectangle (here a square) of canvas with diagonals.

• Lines 0 to 15 are blue
• Lines 16 to 31 are green
• Lines 32 to 47 are red
• Lines 48 to 47 are white -> Rows 16 to 32 are displayed on rows 0 to 15, and rows 48 to 64 are displayed on rows 32 to 47.

Also nothing appear on rows 65 to 128

And here is the command I use for the launch : sudo examples-api-use/lines --led-gpio-mapping=adafruit-hat-pwm --led-show-refresh --led-slowdown-gpio=2 --led-cols=64 --led-rows=64 --led-limit-refresh=100 --led-chain=4 --led-pixel-mapper="U-mapper"

Edit2:

The LED display have IC driver: MBI5166 or MBI5124 or chipone. This subject seems to have been discussed here.

I have tried both fixes, but nothing changes:

• if (col == columns_-4) io->SetBits(h.strobe); // ICN2038S : Bird Techstep
• Swap io->ClearBits(h.strobe); & io->SetBits(h.strobe);.

Edit 21/10:

I discovered my LED display has a HUB75E connector, so I soldered (cf this doc), E pin with 8 pin, which resulted in fixing the error on the top half part. Here is the result.

The thing is I have a 128 x 128 display and the bottom half never lit up. Here is the back of my LED display. I tried to plug the data cable into what I thought was the output for chain display, but when I do I get the exact same output as the other pic, but translated 128 pixels in the bottom.

Does this mean my display do not support chained displays ? Does this mean I need another type of Adafruit with parallel output, and add the --led-parallel=2 flag in my command ?

[jeroenverspeek]

@antoine-nedelec : Did you make any progress? I am having a similar problem for a 128x128 panel (issue #1713).