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hzeller / rpi-rgb-led-matrix

Controlling up to three chains of 64x64, 32x32, 16x32 or similar RGB LED displays using Raspberry Pi GPIO
GNU General Public License v2.0
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128x128 ( 2 x 128x64? ) panels with LS9929 and SM5216 shift-registers #1381

Open hedj opened 2 years ago

hedj commented 2 years ago

G'day. I obtained a couple of the panels below from china with the thought in mind of building an alarm clock for my son. They have LS9929 and SM5216 shift registers for columns and rows. The silkscreen says they're a 1/32-scan panel and the connectors say HUB75E. When asked for pinouts, the vendor gave me a picture of a HUB75 pinout; I'm not exactly sure which is correct.

I'm using an Adafruit hat for a rpi4, but have thus far no success in turning on even a single pixel. I've tried different multiplexing and row address setting parameters to no avail. Also tried again manually setting pin values using an arduino. I have verified power to the device and that I can indeed toggle signals between 0 and 5V at the connector. I do have access to an oscilloscope; is there a suggested process for debugging the panel driving? I have no datasheet for the LS9929 chips, though the 5216 is here:

http://www.88869188.com/uploads/201801/5a542100d93e6.pdf

Any help greatly appreciated.

IMG_1416

hedj commented 2 years ago

It looks like the LS9929 is probably the cause of the troubles; the manufacturer blurb mentions SRAM, which is ominous. Looks like serial data in for row select also. Anyone know how to initialise these chips?

LS9929

Screen Shot 2022-01-01 at 12 04 06 AM
hallard commented 2 years ago

Not sure how to help but would be interested by these panels, where did you get them?

hedj commented 2 years ago

Bought from here:

https://ledlightsworld.com/collections/small-pixel-pitch-led-modules-p1-25-p2

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On Mon, Jan 3, 2022 at 07:29, Charles @.***> wrote:

Not sure how to help but would be interested by these panels, where did you get them?

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hallard commented 2 years ago

thanks, looks like they are not available anymore. Anyway price is expensive, I succeeded to assemble 2 128x64 panels, cheaper and does works fine :-)

daniel-live-update commented 6 months ago

Hi hedj, I know this goes back 2 years but I was wondering if you ever can right? I've built a mini board to control HUB displays and I can get almost all to work except ones with the LS99xx chips. I also can't find a datasheet other that the block diagram you also found.