3 ms·

Nice trek. 100Hz flicker is terrible. It's amazing vendors still are so clueless.

• nyanpasu64 4y ago
  Sorry, I misremembered, the native flicker frequency is at 200 Hz, I had to look up my notes again and verify by listening to my solar panel hooked up to a 3.5mm jack. I forgot to mention, I actually managed to write a program that would dynamically rewrite the period and pulse width registers to play music off the screen backlight, based off a conversion of the Monkey Island tunes from https://www.thanassis.space/monkeyisland.html https://www.thanassis.space/monkeyisland.html. It almost worked... except that whenever I decreased the period (raised the pitch), there was a random chance the new period would be greater than the current phase, and so the display would hang at full or zero brightness nonstop (producing a gap in the sound) until the 16-bit counter running at 0.98 MHz (= 125/128) rolled over, rather than instantly setting the counter to zero and turning the display back on. I've recorded my "best effort" attempt at music, at https://www.youtube.com/watch?v=7qt0ssFk410 https://www.youtube.com/watch?v=7qt0ssFk410 (every recording has different gaps when pitch increases).
  • csdvrx 4y ago
    That's the kind of things I'd try lol Wonderful writeup BTW!
  • nyanpasu64 4y ago
    Correction: new period would be less than the current phase, but the phase doesn't reset to 0.