David J. Fiddes b847f41e24 SPI: Ensure all read-only data pointers are marked as const (#3356) ... This changes all SPI functions that take data pointers which are not modified so that the declaration is const. This allows them to be used with const data (i.e. held in flash). No functional changes are required. The defnitions of spiWrite() and spiTransferBytes() in esp-hal-spi.h/c have been updated to be consistent. Tests: - Build a simple sketch using SPI.writePattern() and SPI.transferBytes() which uses const data and verify that the attached device functions as expected.		2019-10-14 20:39:27 +03:00
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esp32	SPI: Ensure all read-only data pointers are marked as const (#3356)	2019-10-14 20:39:27 +03:00