tom dunigan / Mbed 2 deprecated teensy_dma_memcpy

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Dependencies:   USBDevice mbed

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Teensy 3.1 DMA memcpy, proof of concept

<<code>> 2048 bytes aligned 16 loop set 215.58 mbs 76 us loop copy 910.22 mbs 18 us memset 1365.33 mbs 12 us memcpy 910.22 mbs 18 us memcpy128 1024.00 mbs 16 us errs 0 <</code>

You could add IRQ handler if you wanted asynch operations.

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