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STM32 DMAv3 driver.
Driver capability:
- The driver supports the STM32 enhanced DMA controller found on H7 sub-family.
- Support for cache flushing and invalidation.
The file registry must export:
STM32_HAS_DMAx - Support for DMA unit "x" (1..2).
STM32_DMAx_CHn_HANDLER - Vector name for channel "n" (0..7).
STM32_DMAx_CHn_NUMBER - Vector number for channel "n" (0..7).
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