tom dunigan / Mbed 2 deprecated teensy_dma_dac

use Teensy 3.1 DMA to send sine wave to DAC, timed by PDB

Dependencies:   USBDevice mbed

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.

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