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#include "WProgram.h"

#include "Spi.h"

//---------- constructor ----------------------------------------------------

SPI::SPI()

{

  // initialize the SPI pins

  pinMode(SCK_PIN, OUTPUT);

  pinMode(MOSI_PIN, OUTPUT);

  pinMode(MISO_PIN, INPUT);

  pinMode(SS_PIN, OUTPUT); // <------- !!! (Remember! This pin will select USB host chip Max3421)

  // enable SPI Master, MSB, SPI mode 0, FOSC/4

  mode(0);

}

//------------------ mode ---------------------------------------------------

void SPI::mode(byte config)

{

  byte tmp;

  // enable SPI master with configuration byte specified

  SPCR = 0;

  SPCR = (config & 0x7F) | (1<<SPE) | (1<<MSTR);

  tmp = SPSR;

  tmp = SPDR;

}

//------------------ transfer -----------------------------------------------

byte SPI::transfer(byte value)

{

  SPDR = value;

  while (!(SPSR & (1<<SPIF))) ;

  return SPDR;

}

byte SPI::transfer(byte value, byte period)

{

  SPDR = value;

  if (period > 0) delayMicroseconds(period);

  while (!(SPSR & (1<<SPIF))) ;

  return SPDR;

}

//---------- preinstantiate SPI object --------------------------------------

SPI Spi = SPI();