Sunday, August 8, 2010

Scrolling Sign Software for the Big Blink

While on vacation a week ago I had a chance to design, code, and test scrolling sign software for the big blink charlieplexed display I built. Here's a video of the resulting test program.

The display is memory mapped to a buffer in RAM with the main loop updating the buffer with scrolling characters, and an interrupt routine lighting the pixels. It still needs some optimization to smooth out the blinkiness, and eliminate a race condition that crashes the code after some run time, but I'm pretty happy given it only took about 8 or 9 hours work.

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