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.

Diff: USBDevice.lib

Revision:
0:a57be408001f
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBDevice.lib	Mon Oct 05 14:23:37 2015 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/USBDevice/#2af474687369