No description, website, or topics provided.
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Permalink
Type Name Latest commit message Commit time
Failed to load latest commit information.
boards
rtl-intel
rtl-xilinx
software
teensy-3.2/rgb-led-bar-graph-perlin
README.md

README.md

Some notes:

Altera and Xilinx versions are the same except for the interface used to interface to the CPU. For Xilinx, it's an AXI4-Lite bus. For Intel/Altera it's an Avalon bus.

Minimum value of BASE_DELAY in both versions of code is 22 + (2 * (number of columns)). For the SparkFun RGB bar graph this is 22 + 2 * 16 = 22 + 32 = 54.

Refresh rate is calculated as

(input clock frequency) / ((number of rows) * (BASE_DELAY) * (2^(bit depth) - 1)

For the SparkFun RGB LED bar graph this works out to

(50e6) / (16 * 54 * (2^8 - 1)) = 227 Hz

For the DF Robot / Adafruit 64x64 RGB LED panels this works out to

(50e6) / (32 * (22+2*64) * (2^6 - 1)) = 165 Hz

For my 96 x 64 video "wall" this works out to

(50e6) / (16 * 960 * (2^4 - 1)) = 217 Hz

In theory the base delay of 960 for these panels could be lowered to 22 + 2 * 192 = 406.