// This file has been prepared for Doxygen automatic documentation generation.
/*! \file ********************************************************************
*
* Atmel Corporation
*
* File              : USI_TWI_Slave.c
* Compiler          : IAR EWAAVR 3.20c
* Revision          : $Revision: 1.14 $
* Date              : $Date: Friday, December 09, 2005 17:25:38 UTC $
* Updated by        : $Author: jtyssoe $
*
* Support mail      : avr@atmel.com
*
* Supported devices : All device with USI module can be used.
*
* AppNote           : AVR312 - Using the USI module as a I2C slave
*
* Description       : Example showing how to use the USI_TWI drivers;
*                     Loops back received data.
*
*
****************************************************************************/

#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#include "usiTwiSlave.h"

#define nsamples 100 // number of samples to accumulate


// Sample TWI transmission commands
#define TWI_CMD_MASTER_WRITE 0x10
#define TWI_CMD_MASTER_READ  0x20
#define TWI_CMD_MASTER_WRITE_ALOT 0x30

/* \Brief The main function.
 * The program entry point. Initates TWI and enters eternal loop, waiting for data.
 */
int main( void )
{
  unsigned char TWI_slaveAddress, temp = 0;

  //Setting up for read
  static uint16_t count;
  static uint32_t accum;
  ADMUX = (0 << REFS2) | (0 << REFS1) | (0 << REFS0) // Vcc ref
     | (0 << ADLAR) // right adjust
     | (0 << MUX3) | (0 << MUX2) | (1 << MUX1) | (0 << MUX0); // ADC4
  ADCSRA = (1 << ADEN) // enable
     | (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0); // prescaler /128

  // LED feedback port - connect port B to the STK500 LEDS
  PORTB = 0x55; // Startup pattern

  // Own TWI slave address
  TWI_slaveAddress = 0x10;
  usiTwiSlaveInit( TWI_slaveAddress );

  sei();
  // This loop runs forever. If the TWI Transceiver is busy the execution will just continue doing other operations.
  for(;;)
  {

  usiTwiTransmitByte(temp);

  //
  // accumulate samples
  //
  accum = 0;
  for (count = 0; count < nsamples; ++count) {
     //
     // initiate conversion
     //
     ADCSRA |= (1 << ADSC);
     //
     // wait for completion
     //
     while (ADCSRA & (1 << ADSC))
        ;
     //
     // add result
     //
     accum += ADC;
   }
   temp = accum;

  }
}