Re-introduced possibility of DMA peripheral abstraction, and added SPI DMA abstraction example#292

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johnnyegel wants to merge 13 commits intostm32-rs:masterfrom

johnnyegel:dma-abstraction-and-improved-spi-dma-example

Commits on Dec 4, 2020

Added support for OpenDrain configuration on Sck and Mosi SPI pins.
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Added missing use for OpenDrain
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Changes formatting to please the format checker.
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Re-introduced trait for defining the wait and is_done functions
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Working on example
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Updated example to showcase the use of abstractions for SPI DMA transfers. Also added dynamically generated data, and transmission in a continuous loop.
johnnyegel
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Re-instated the old simple SPI DMA example, and added a new example for use via abstraction.
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Fixed formatting problem
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Added missing trait after re-introducting it into the DMA.
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Added another missing Transferable use statement
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Commits on Dec 6, 2020

Added Transferable to the prelude includes, making it unecessary to specify it explicitly in examples. This means all examples are as they where before re-adding the trait.
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Commits on Jan 16, 2021