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/**************************************************************************//**
  \file  i2c.c

  \brief Provides the functionality of TWI.

  \author
      Atmel Corporation: http://www.atmel.com \n
      Support email: avr@atmel.com

    Copyright (c) 2008-2011, Atmel Corporation. All rights reserved.
    Licensed under Atmel's Limited License Agreement (BitCloudTM).

  \internal
    History:
      5/12/07 A. Khromykh - Created
 ******************************************************************************/
/******************************************************************************
 *   WARNING: CHANGING THIS FILE MAY AFFECT CORE FUNCTIONALITY OF THE STACK.  *
 *   EXPERT USERS SHOULD PROCEED WITH CAUTION.                                *
 ******************************************************************************/

/******************************************************************************
                   Includes section
******************************************************************************/
#include <i2c.h>
#include <halTaskManager.h>
#include <halDbg.h>
#include <halDiagnostic.h>
/******************************************************************************
                   Implementations section
******************************************************************************/
/******************************************************************************
Inits TWI module. Setup teh speed of TWI.
Parameters:
  i2cMode - the speed of TWI.
Returns:
  none.
******************************************************************************/
void halInitI2c(HAL_i2cMode_t *i2cMode)
{
  TWCR = 0x00;
  TWSR = HAL_I2C_PRESCALER; // prescaler
  // Set bit rate
  TWBR = i2cMode->clockrate;
}

/******************************************************************************
Interrupt handler.
******************************************************************************/
ISR(TWI_vect)
{
  BEGIN_MEASURE
  switch (TWSR & 0xF8)
  {
    case TWS_START:
    case TWS_RSTART:
      halSendStartDoneI2c();
      break;

    case TWS_MT_SLA_ACK:
    case TWS_MT_DATA_ACK:
      halWriteDoneI2c();
      break;

    case TWS_BUSERROR:
    case TWS_MT_SLA_NACK:
    case TWS_MT_DATA_NACK:
    case TWS_MR_SLA_NACK:
      halI2cBusReset();
      break;

    case TWS_MR_SLA_ACK:
      halMasterReadWriteAddressAckI2c();
      break;

    case TWS_MR_DATA_ACK:
      halReadDoneI2c(halReadByteI2c());
      break;

    case TWS_MR_DATA_NACK:
      halReadLastByteDoneI2c(halReadByteI2c());
      break;

    default:
      break;
  }
  END_MEASURE(HALISR_TWI_TIME_LIMIT)
}
// eof i2c.c