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

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 1092.27 mbs 15 us    DMA
errs 0

Obviously, the ARMCC memcpy() is quite fast (unrolled assembler I presume).

You could add IRQ handler if you wanted asynch operations.

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