SPI

SPISettings

Since 0.6.2:

The SPISettings object specifies the SPI peripheral settings. This object can be used with beginTransaction() function and can replace separate calls to setClockSpeed(), setBitOrder() and setDataMode().

You should use SPISettings() with 2.0.0 and later, with or without #include "Arduino.h.

__SPISettings() can be used in 0.6.2 and later for backward compatibility with those versions of Device OS, but is unnecessary for 2.0.0 and later.

// SYNTAX
SPI.beginTransaction(SPISettings(4*MHZ, MSBFIRST, SPI_MODE0));
// Pre-declared SPISettings object
SPISettings settings(4*MHZ, MSBFIRST, SPI_MODE0);
SPI.beginTransaction(settings);

Parameters:

• clockSpeed: maximum SPI clock speed (see setClockSpeed())
• bitOrder: bit order of the bits shifted out of and into the SPI bus, either LSBFIRST (least significant bit first) or MSBFIRST (most-significant bit first)
• dataMode: SPI_MODE0, SPI_MODE1, SPI_MODE2 or SPI_MODE3 (see setDataMode())