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/*!
* \file    tsic.c
* \brief   ZMD TSic Temperatursensor lesen
* \author  Joerg S
* \date    7.2007
*/

#include "treiber_import.h"


///////////////////////////////////////////////////////////////////////////////////////////////////
/*!
* \brief Temperatur von TSic Sensor empfangen
* \param temp  R�ckgabepointer f�r Temperatur (Vorkommastellen). MSB ist negativ Bit. Wenn MSB 1,
          dann ist Tempertaur negativ.
* \param nachkomma R�ckgabepointer f�r Temperatur (Nachkommastellen)
* \return temp_float Temperatur in float-Variable
*/
float Read_Temp_TSic ( unsigned char *temp, unsigned int *nachkomma)
{
  unsigned int temp_value;
  float Temp_float;

  INIT_TA_SMCLK_500KHZ;


  // VCC fuer Sensor einschalten
  TSIC_ON;

  // Warten bis Spannung satbil
  delay_100us(1);


  if (getTSicTemp(&temp_value))
  {
//    Temp_float = (((float)temp_value / 2047) * 200) - 50; // conversion equation from TSic's data sheet
    Temp_float = (temp_value * 0.097704) -50;
  }


  // VCC fuer Sensor ausschalten
  TSIC_OFF;

  *temp = (unsigned int) Temp_float;

  return Temp_float;
}
///////////////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////////////////////////
unsigned char getTSicTemp (unsigned int *temp_value16)
{
  unsigned int  temp_value1 = 0;
  unsigned int  temp_value2 = 0;
  unsigned char i;
  unsigned int  Temperature;
  unsigned char parity;


  // Sensor benoetigt 65-85ms nach Power-Up bis zum senden
  TAR = 0;
  while (ZWIRE_IN_H && (TAR < ZWIRE_TIMEOUT_START)); // Warten auf Start-Bit
  if (TAR >= ZWIRE_TIMEOUT_START) return FALSE;


  // Start-Bit (TStrobe) abwarten
  TAR = 0;
  while (ZWIRE_IN_L && (TAR < ZWIRE_TIMEOUT_BIT));
  if (TAR >= ZWIRE_TIMEOUT_BIT) return FALSE;


  // Start-Bit = 62,5�s low und 62,5�s high
  // Logisch 1 = 31,25�s low und 93,75�s high
  // Logisch 0 = 93,75�s low und 31,25�s high

  // Erstes Byte lesen (8Bit + 1Bit Parity)
  for (i = 0; i < 9; i++)
  {
    TAR = 0;
    while (ZWIRE_IN_H && (TAR < ZWIRE_TIMEOUT_BIT)); // Auf fallende Flanke warten
    if (TAR >= ZWIRE_TIMEOUT_BIT) return FALSE;

    TAR = 0;
    while (TAR < ZWIRE_HALFBIT_TIMER);

    if (ZWIRE_IN_H)
      temp_value1 |= 1 << (8-i); // Wenn high, dann logisch 1

    TAR = 0;
    while (ZWIRE_IN_L && (TAR < ZWIRE_TIMEOUT_BIT)); // Auf steigende Flanke warten
    if (TAR >= ZWIRE_TIMEOUT_BIT) return FALSE;
  }


  // Auf naechtes Start-Bit warten
  TAR = 0;
  while (ZWIRE_IN_H && (TAR < ZWIRE_TIMEOUT_START)); // Warten auf Start-Bit

  if (TAR >= ZWIRE_TIMEOUT_START) return FALSE;


  // Start-Bit (TStrobe) abwarten
  TAR = 0;
  while (ZWIRE_IN_L && (TAR < ZWIRE_TIMEOUT_BIT));
  if (TAR >= ZWIRE_TIMEOUT_BIT) return FALSE;


  // Zweites Byte lesen (8Bit + 1Bit Parity)
  for (i = 0; i < 9; i++)
  {
    TAR = 0;
    while (ZWIRE_IN_H && (TAR < ZWIRE_TIMEOUT_BIT)); // Auf fallende Flanke warten
    if (TAR >= ZWIRE_TIMEOUT_BIT) return FALSE;

    TAR = 0;
    while (TAR < ZWIRE_HALFBIT_TIMER);

    if (ZWIRE_IN_H)
      temp_value2 |= 1 << (8-i); // Wenn high, dann logisch 1

    TAR = 0;
    while (ZWIRE_IN_L && (TAR < ZWIRE_TIMEOUT_BIT)); // Auf steigende Flanke warten
    if (TAR >= ZWIRE_TIMEOUT_BIT) return FALSE;
  }



  // Parity Byte 1
  parity = 0;
  for (i = 0; i < 9; i++)
    if (temp_value1 & (1 << i))
      parity++;

  if (parity % 2)
    return FALSE;

  // Parity Byte 2
  parity = 0;
  for (i = 0; i < 9; i++)
    if (temp_value2 & (1 << i))
      parity++;

  if (parity % 2)
    return FALSE;


  temp_value1 >>= 1; // delete parity bit
  temp_value2 >>= 1; // delete parity bit
  Temperature = (temp_value1 << 8) | temp_value2;
  *temp_value16 = Temperature;


  return TRUE; // parity is OK
}
///////////////////////////////////////////////////////////////////////////////////////////////////