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Add SPI_MODEx docs #68

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Add SPI_MODEx docs #68

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9 changes: 5 additions & 4 deletions SPI.h
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Original file line number Diff line number Diff line change
Expand Up @@ -48,10 +48,11 @@
#define MSBFIRST 1
#endif

#define SPI_MODE0 0x00
#define SPI_MODE1 0x04
#define SPI_MODE2 0x08
#define SPI_MODE3 0x0C
// SPI Mode details: https://en.wikipedia.org/wiki/Serial_Peripheral_Interface#:~:text=the%20original%20specification.-,Mode%20numbers,-%5Bedit%5D
#define SPI_MODE0 0x00 // CPOL = 0, CPHA = 0
#define SPI_MODE1 0x04 // CPOL = 0, CPHA = 1
#define SPI_MODE2 0x08 // CPOL = 1, CPHA = 0
#define SPI_MODE3 0x0C // CPOL = 1, CPHA = 1

#define SPI_CLOCK_DIV4 0x00
#define SPI_CLOCK_DIV16 0x01
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