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STM32 DMAv2 driver.
Driver capability:
- The driver supports the STM32 enhanced DMA controller found on F2, F4 and
F7 sub-families.
- Support for automatic the channel selection.
- Support for cache flushing and invalidation.
The file registry must export:
STM32_ADVANCED_DMA - TRUE not used by the DMA drivers but other
drivers use it to enable checks on DMA
channels. Probably will be removed in the
future.
STM32_HAS_DMAx - Support for DMA unit "x" (1..2).
STM32_DMAx_CHn_HANDLER - Vector name for channel "n" (0..7).
STM32_DMAn_CHx_NUMBER - Vector number for channel "n" (0..7).
STM32_DMA_CACHE_HANDLING - TRUE if the device requires explicit cache
handling on DMA buffers.
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