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All changes but one are to documentation comments, and one to an
ordinary comment.
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This is needed for the program to work correctly on rp235xb when using
the higher pin numbers.
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This commit adds a new PIO program which implements SPI. This allows
you to drive more than 2 SPI buses by using PIO state machines as
additional duplex SPI interfaces.
The driver supports both blocking and async modes of operation and
exclusively uses the DMA for async IO.
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