Millis() function is extremely inaccurate when playing audio on Feather M0 about adafruit_vs1053_library HOT 2 OPEN

Hi @TheNitek I tested by raising the interrupt priority for the SysTick on the arduino core initialization and lowered the priority for the external interrupts (used by the VS1053 library). Now the code works as expected but still not convinced of this because involves messing with the Arduino core.

Feeding the buffer inside the main loop is the easiest solution, but because most of the Arduino libraries implement some kind of blocking behavior (specially the networking ones). Doing the buffer on the main loop doesn´t looks like the best approach, especially on complex projects that might include such libraries.

from adafruit_vs1053_library.

On my ESP8266 I do not use the interrupts and feed the buffer inside of the main loop. Works great (also I did not try 320kps MP3s yet) and my guess would be that it solves your problem, so why not give it a try? Should be an easy fix.

from adafruit_vs1053_library.