PICDEM Funktion einbinden, wie? (Anfängerhilfe)

Hallo. Ein Anfänger braucht Hilfe!
Ich habe 2 Picdem Z boards und möchte einen intergrierten Sensor (TC77) 
abfragen. Ich möchte diese Funktion in das Demoprogramm einbinden. Im 
Mikrochip Forum habe ich eine Funktion (C-Programm) gefunden, die ich 
nutzen will. Die Funktion sieht wie folgt aus: (Frage hierzu folgt im 
Anschluss)


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-
#include "generic.h"
  #include "TC77.h"
  #include "Console.h"
  #include "string.h"
  #include "MSPI.h"

  #define TC77_CS             LATA2

 /*********************************************************************
  * Function:        BYTE GetTC77String( char *buffer )
  *
  * PreCondition:    None
  *
  * Input:           buffer - pointer where to store the string.
  *
  * Output:          The length of the returned string.
  *
  * Side Effects:    None
  *
  * Overview:        This function reads the TC77 and returns a 
formatted
  *                  temperature value at *buffer.  If we get a 0x00
  *                  or 0xFF, we report that we are having a problem
  *                  with the temperature sensor.
  *
  * Note:
  ********************************************************************/
 BYTE GetTC77String( char *buffer )
 {
     typedef union _SIGNED_WORD_VAL
     {
         unsigned int uVal;
         int Val;
         struct
         {
             BYTE LSB;
             BYTE MSB;
         } byte;
     } SIGNED_WORD_VAL;

     BYTE            GIEHsave;
     char            *ptr;
     char            *pTempString;
     SIGNED_WORD_VAL RawTemp;
     signed long     ScaledTemp;
     BYTE            strLen;
     char            tempString[10];

     // Read the temperature from the TC77
     //
     // The TC77 gives a left aligned 13 bit signed integer
     // where 0 = 0 degrees Celcius, 1 = 0.0625 degrees,
     // 2 = 0.125 degrees, -1 = -0.0625 degrees,
     // -2 = -0.125 degrees, 400 = 25 degrees, etc.
     // To convert it to a usable value, one should
     // right align it and then sign extend it.  For human
     // display purposes, one should either convert it to a
     // floating point number and multiply it by 0.0625
     // degrees C.  Alternatively, it may be left as an integer
     // and multiplied by 625.  The result would be scaled by
     // a factor of 10,000.

     // Disable interrupts while we talk to the temperature sensor.
     GIEHsave = GIEH;
     GIEH = 0;

     // Read data from the TC77
     TC77_CS = 0;                    // Select TC77
     RawTemp.byte.MSB = SPIGet();    // Get high 8 bits
     RawTemp.byte.LSB = SPIGet();    // Get low 5 bits + "Bit 2" + 2 
don't care bits (LSb side)
     TC77_CS = 1;                    // Unselect TC77

     // Restore interrupts.
     GIEH = GIEHsave;

     if ((RawTemp.uVal == 0x0000) || (RawTemp.uVal == 0xFFFF))
     {
         strcpypgm2ram( buffer, (rom char *)"Problem reading TC77." );
     }
     else
     {
         // Right align the 13 bit temperature reading
         RawTemp.uVal >>= 3;

        // Sign extend the value from 13 bits to 16 bits
         if(((BYTE_VAL*)&RawTemp.byte.MSB)->bits.b4)
         {
             RawTemp.byte.MSB |= 0xE0;
        }

         // Convert the TC77 integer to a scaled one with units 0.0001 
degrees C
         ScaledTemp = (long)RawTemp.Val * (long)625;

         // Convert the integer to a string and find its length
         pTempString = ltoa( ScaledTemp, tempString );
         strLen = strlen( tempString );

         // Write the negative sign if needed. We are going to
         // format small negative numbers a little differently.
         ptr = buffer;
         if(tempString[0] == '-')
         {
             *ptr++ = '-';
             strLen--;
             pTempString++;
         }

         // Write "0." and then the number if this number is too close 
to zero; eg: 0, 0.0625, -0.125
         if(strLen < 5)
         {
             *ptr++ = '0';
             *ptr++ = '.';
             memcpy( (void *)ptr, (void *)tempString, strLen );
             *ptr += strLen;
         }
         // Otherwise, write the full number and write
         // the decimal place in digit 5's position;
         // eg: 24.1250
         else
         {
             for(;strLen >= 5; strLen--)
                 *ptr++ = *pTempString++;
            *ptr++ = '.';
             for(;strLen > 0; strLen--)
                 *ptr++ = *pTempString++;
         }

         // Write °C"
         *ptr++ = ' ';
         *ptr++ = 'C';
         *ptr = '\0';
     }

     return strlen( buffer );
 }
--------------------------------------------

Meine Frage: Wie baue ich die Funktion in das Programm ein? Also wie 
rufe ich diese Funktion auf? Ich muss doch einen Wert in die Funktion 
geben (char *buffer), ich weiss aber nicht wie das aussehen soll. Ich 
bin erst am Anfang bezüglich meiner Programmierfähigkeiten.

Ich hoffe ihr könnt mir helfen. Ich bedanke mich schonmal im vorraus.