millis() almost 1/6 slower?

[nateclaflin]

i ported code over from one of my esp8266 projects which ran perfectly on time, but ive found that the millis() are almost interpreted 1/6 the speed. in the example ive found that 150ms equals about 1s, and it appears to be linear so if i set it to 1000ms it takes about 6s to process the light change.

Anyone have any idea why? the CPU is overclocked to 200mhz and i have it compiled for the fastest mode.

Here's the relevant snippits of my code. I've tried a few things like using uint32_t instead of long to record the millis in case it was an issue of memory alignment

Code: Select all

 
               for (;;) {
                    spin_crystal((uint32_t)millis());
                }

and function:

Code: Select all

void spin_crystal(uint32_t global_millis) {
  if (crystal_millis == 0) {
    crystal_millis = global_millis;
  }
	if ((global_millis-crystal_millis) > 150) {
    crystal_millis = global_millis;
		current_crystal_color = (current_crystal_color + 1) % 3;
		for (int i = CRYSTAL_OFFSET; i < MOON_OFFSET; i++) {
				strip1.setPixelColor(i, crystal_colors[(current_crystal_color+i)%3]);
		}
		strip1.show();
	}

[Franklin97355]

What processor are you using?

[nateclaflin]

What processor are you using?

it's the itsybitsy m4

[nateclaflin]

For now, i've worked around this by just using a hardware timer and counters to control flow during different events, but i'm still curious why trying to delay using millis() specifically is just super wrong on this board