SPI support classes

Provides SPI support. More...

Functions
virtual void	SPIBase::begin ()=0
	begin(): Initializes the SPI bus by setting SCK, MOSI, and SS to outputs, pulling SCK and MOSI low, and SS high. More...
virtual void	SPIBase::end ()=0
	end(): Disables the SPI bus (leaving pin modes unchanged). More...
virtual void	SPIBase::beginTransaction (SPISettings mySettings)=0
	beginTransaction(): Initializes the SPI bus using the defined SPISettings. More...
virtual void	SPIBase::endTransaction ()=0
	endTransaction(): Stop using the SPI bus. Normally this is called after de-asserting the chip select, to allow other libraries to use the SPI bus. More...
virtual unsigned char	SPIBase::transfer (unsigned char val)=0
	transfer(), transfer16() More...
virtual unsigned short	SPIBase::transfer16 (unsigned short val)=0
virtual void	SPIBase::transfer (uint8 *buffer, size_t size)=0
	SPISettings::SPISettings (int speed, uint8 byteOrder, uint8 dataMode)
	constructor for SPISettings More...
uint8	SPISettings::getDataMode ()
bool	SPISettings::operator== (const SPISettings &other) const
void	SPISettings::print (const char *s)

Variables
SPISettings	SPIBase::SPIDefaultSettings

Friends
class	SPIClass

Detailed Description

Provides SPI support.

SPISettings() default Constructor.

SPIBase() default Constructor.

Function Documentation

virtual void SPIBase::begin ( )

pure virtual

begin(): Initializes the SPI bus by setting SCK, MOSI, and SS to outputs, pulling SCK and MOSI low, and SS high.

Implemented in SPIClass, and SPISoft.

virtual void SPIBase::beginTransaction ( SPISettings  mySettings )

pure virtual

beginTransaction(): Initializes the SPI bus using the defined SPISettings.

Implemented in SPIClass, and SPISoft.

virtual void SPIBase::end ( )

pure virtual

end(): Disables the SPI bus (leaving pin modes unchanged).

Implemented in SPIClass, and SPISoft.

virtual void SPIBase::endTransaction ( )

pure virtual

endTransaction(): Stop using the SPI bus. Normally this is called after de-asserting the chip select, to allow other libraries to use the SPI bus.

Implemented in SPIClass, and SPISoft.

SPISettings::SPISettings	(	int	speed,
		uint8	byteOrder,
		uint8	dataMode
	)

constructor for SPISettings

Settings are applied to SPI::beginTransaction(SPISettings) and are valid until next beginTransaction()

Parameters

speed	The maximum speed of communication. For a SPI chip rated up to sys clock speed. For 20 MHz, use 20000000.
byteOrder	MSBFIRST or LSBFIRST
dataMode	: SPI_MODE0, SPI_MODE1, SPI_MODE2, or SPI_MODE3

byteOrder's are:

    MSBFIRST    Data is sent out starting with Bit31 and down to Bit0
    LSBFIRST    Data is sent out starting with the lowest BYTE, from MSB to LSB.
                0xABCDEFGH would be sent as 0xGHEFCDAB

Data modes are:

    Mode        Clock Polarity (CPOL)   Clock Phase (CPHA)
    SPI_MODE0       0                   0
    SPI_MODE1       0                   1
    SPI_MODE2       1                   0
    SPI_MODE3       1                   1

virtual unsigned char SPIBase::transfer ( unsigned char  val )

pure virtual

transfer(), transfer16()

SPI transfer is based on a simultaneous send and receive: the received data is returned in receivedVal (or receivedVal16). In case of buffer transfers the received data is stored in the buffer in-place (the old data is replaced with the data received).

    receivedVal = SPI.transfer(val)
    receivedVal16 = SPI.transfer16(val16)
    SPI.transfer(buffer, size)

Implemented in SPIClass, and SPISoft.