David J. Fiddes dac493fb92 SPI: Fix discarded-qalifiers warning when compiling with all warnings (#3458) ... * SPI: Fix discarded-qalifiers warning when compiling with all warnings This fixes an error introduced with changeset b847f41 which tightened the use of const for read-only data. The helper funtion __transferBytes also requires the const qualifier on outgoing data. Without this change a warning is displayed when compiling with the Arduino IDE set to display "All" compiler warnings. Tests: - Build an ESP32 SPI sketch that uses static const data to send to an SPI device using the SPI.transferBytes() API * SPI:Ensure all local functions are marked static This audits all functions in the esp32-hal-xpi.c module and ensures that any functions entirely local to the module are marked as static. Tests: - Build with Arduino set to show all warnings and ensure none are displayed * SPI: Remove unused local __spiTranslate24 function This removes the __spiTranslate24() function which is unused.		2019-11-11 17:44:49 +01:00
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esp32	SPI: Fix discarded-qalifiers warning when compiling with all warnings (#3458)	2019-11-11 17:44:49 +01:00