Differences

This shows you the differences between two versions of the page.

--- projects:q3kled [2015/12/23 17:01] – q3k
+++ projects:q3kled [2016/01/13 08:26] – q3k
@@ Line 3: / Line 3: @@
 [[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!
+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
 {{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}}
-After 32c3 dies down, I should go ahead and refactor most of the code and make sure it's tunable (right now the display format is hardcoded, and so are a few software components)...
 ===== Components =====