# Adjustable Frequency LED Chaser

A project for Tiny Tapeout 4 (https://tinytapeout.com/).

This is a simple LED chaser animation for a seven-segment display,
but a configurable bank of clock dividers allows the animation to run at
human-reasonable speeds for all input clock frequencies. The intent is to
support a wide range of PCBs: as long as there's any clock and display
whatsoever, you get a pretty demo. (It can also be used as a frequency
counter in a pinch.)

By default, a new frame of the 6-frame LED chaser pattern is displayed
on outputs 0 through 5 every rising clock edge. Inputs 0 through 4 toggle
clock dividers of 2x (2^1), 4x (2^2), 16x (2^4), 256x (2^8), and 65536x
(2^16) respectively. These dividers stack multiplicatively for a maximum
clock division of 2^31 = 2.15e9, which easily slows the maximum expected
50MHz clock to sub-Hertz frequencies. Combining a subset of the clock
dividers allows fine adjustment.