Warszawski Hackerspace

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{{template>:template:project
 | name=chubbyled/colorlight-blaster
 | status=active
 | founder=[[user>informatic]]
 | repo=[[code>informatic/colorlight-blaster]]
}}

====== Chubbyled ======

Reincarnation of q3kled project (archived below). Same 128x128 (4x4x[64x64]) RGB LED panel, but based on Colorlight 5A-75B.

While said board [[github>q3k/chubby75|has been reverse-engineered]] and can be used as a target for custom FPGA bitstream, no such bitstream has been prepared. However - using [[code>informatic/colorlight-blaster|some disgusting python code]] (involving raw ethernet frames broadcasting) original bitstream can be controlled.

LED panel is now mounted next to a rollup projection screen in main room. Connect blue ethernet cable marked as "No uplink/No internet/LED Panel" directly to your machine and use [[code>informatic/colorlight-blaster]].

**DO NOT TRY TO CONNECT IT TO HACKERSPACE LAN ETHERNET NETWORK!** Due to broadcast nature of these ethernet video packets this **will** take down most of wifi devices.


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{{template>:template:project
 | name=q3kled
 | status=abandoned
 | founder=[[user>q3k]]
 | repo=[[github>q3k/ledvideo]]
}}

====== Chinese 'HUB75' RGB LED Driver ======

[[people:q3k:start|q3k]]'s project to create a Zynq-based RGB LED Matrix driver.

[[https://youtu.be/gnT0wj1DyD0|Video of a 128x128 panel it action at 32c3]].

===== Overview =====

This project targets the [[projects:zturn-hackers|MYiR ZTurn board]] with a custom buffer interface board (to be released). The programmable logic exposes a 65-kbyte block RAM to Linux running on the PS via a full-speed AXI slave. The logic also loads data from the BRAM, gamma corrects it and outputs it to the RGB panel interface.

===== Current Status =====

It works! But really needs to be re-written. Keep poking q3k on IRC until he does so.

Issues:
  * <del>Vertical glitches</del> Fixed by switching buffers to 5V
  * <del>Low framerate</del> Fixed by switching buffers to 5V and increasing pixel clock
  * Horizontal ghosting
  * No double buffering in hardware
  * No vsync / interrupts
  * No runtime configuration
  * Kernel framebuffer access from userspace (FBDev/DirectFB) locks up whole system
  * Gamma correction is poor, needs and actual ICC color profile correction
  * Hardcoded parameters in kernel/mpv driver

Note: photo of display was taken before dank memes started becoming appropriated by hate groups.

{{https://owncloud.hackerspace.pl/index.php/apps/files_sharing/ajax/publicpreview.php?x=1278&y=1358&a=true&file=IMG_20151222_185742.jpg&t=vcbwcUxqmTVcCfh&scalingup=0&.png?600}}
{{https://owncloud.hackerspace.pl/index.php/apps/files_sharing/ajax/publicpreview.php?x=1278&y=1358&a=true&file=IMG_20151222_212052.jpg&t=naEYL6o4nBA6RJR&scalingup=0&.png?600}}


===== Components =====

  * [[https://github.com/q3k/ledvideo|AXI4 slave IP Core]]
  * [[https://github.com/q3k/q3kled|Linux Kernel framebuffer driver]]
  * [[https://github.com/q3k/mpv|mpv fork with direct LED output (bypassing kernel)]]