Fixed/Added SPI DMA features in SPI library.#234

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Commits on Aug 7, 2020

Fixed/Added SPI DMA features in SPI library.

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* added support for original spi transfers functions that require poling for completion.

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added the automatic firing of multiple dma transactions if the transfer size is over 65535 bytes. This should work for poling or asynchronous dma transfers.

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fixed spelling mistake

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fixed spelling error

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* commented out non dma function for now. Its function signature conflicts with dma transfer with optional boolean for blocking. I dont know of a instance where the non dma is a requirement or bett…

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removed Math.h from example casuing build check errors

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