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SPI Driver API bugfixes and cleanup, part 2 (#180)
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* Make it so that SPI::select() works correctly with async stuff

* Add more overloads for SPI functions, make sure that SPI::abort_transfer() correctly toggles CS

* SPI: Implement reference counting so that DMA channels get freed properly

* Fix initialization of SPI peripheral structures

* Update docs a bit

* Use a mutex to protect SPI::_peripherals instead of a critical section, because spi_free() may not be ISR safe

* Style fixes
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@multiplemonomials
multiplemonomials authored Aug 25, 2023
1 parent 20756f3 commit 1ed5f1f
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