tom dunigan
use Teensy 3.1 DMA to send sine wave to DAC, timed by PDB
Example of using Teensy 3.1 DMA to send sine wave value to DAC timed by PDB, based on https://forum.pjrc.com/threads/28101-Using-the-DAC-with-DMA-on-Teensy-3-1
you can jumper DAC to A0 and sample the output or view with scope.