SPI access (using member functions)

After initializing the hardware by the begin() method, the bus can be read and written by beginTransaction(). Executing beginTransaction() selects the SPI select pin. Read/write is done with the transfer() function; SPI reads and writes at the same time.

beginTransaction()

void beginTransaction()
void beginTransaction(SPISettings settings)

Starts the use of the bus; sets the SPI select pin.

If called with the settings parameter given, the bus is set.

endTransaction()

void endTransaction()

Terminates the use of the bus; releases the SPI select pin.

transfer(), transfer16(), transfer32()

inline uint8_t transfer(uint8_t data)
inline uint16_t transfer16(uint16_t data)
inline uint32_t transfer32(uint32_t data)

Reads and writes the bus. transfer() transfers 8 bits, transfer16() transfers 16 bits, and transfer32() transfers 32 bits.