Probleme mit If-Schleife bei XC2287M

Hallo,

ich habe ein Problem mit einem XC2287M. Digital I/O funktioniert 
einwandfrei. Auch SSC (Syncronous Serial Channel) funktioniert, d.h. ich 
erhalte ein SPI-ähnliches Signal am Oszi. Mein Problem ist jedoch, dass 
der µC sich nach Senden der Daten in der If-Schleife aufhängt. Hier der 
Code:

if(P10_IN_P1==0x00){

     P10_OUT_P4=0x00;  //Setze LED P10.4

  U0C0_SSC_vSendData(0xAA);  //Sende Daten

  }

  P10_OUT_P4=0x01;
}

Der Code steht in der Main-Schleife. Wenn ich den µC resete, kann ich 
immer nur ein Signal erzeugen, dann hängt der Controller in der Schleife 
fest.

Hier noch der Code für das USIC:

//********************************************************************** 
******
// @Module        Universal Serial Interface Channel (USIC) U0C0
// @Filename      U0C0.C
//---------------------------------------------------------------------- 
------
// @Controller    Infineon XC2287M-104F80

//********************************************************************** 
******

#include "MAIN.H"

//********************************************************************** 
******
// @Function      void U0C0_SSC_vInit(void)
//
//---------------------------------------------------------------------- 
------
// @Description   This is the initialization function of the U0C0 
function
//                library. It is assumed that the SFRs used by this 
library
//                are in reset state.
//
//********************************************************************** 
******


void U0C0_SSC_vInit(void)
{

-----------------------------------------------------------------------
  ///  Configuration of the U0C0 Fractional Divider:
  /// 
-----------------------------------------------------------------------
  ///  - The Fractional divider is selected
  ///  - The step value STEP = 640

  U0C0_FDRL      =  0x8280;      // load U0C0 fractional divider 
register

  /// 
-----------------------------------------------------------------------
  ///  Configuration of the U0C0 Baudrate Generator:
  /// 
-----------------------------------------------------------------------
  ///  - The selected BaudRate is 100,000 kbaud
  ///  - The PreDivider for CTQ, PCTQ = 0
  ///  - The Denominator for CTQ, DCTQ = 0
  ///  - The Divider factor PDIV = 249

  U0C0_BRGL      =  0x0000;      // load U0C0 load baud rate generator
                                 // register L

  U0C0_BRGH      =  0x00F9;      // load U0C0 load baud rate generator
                                 // register H

  /// 
-----------------------------------------------------------------------
  ///  Configuration of the U0C0 Input Control Register:
  /// 
-----------------------------------------------------------------------
  ///  - Receive input is not selected

  /// 
-----------------------------------------------------------------------
  ///  Configuration of the U0C0 Interrupt Node Pointer Register:
  /// 
-----------------------------------------------------------------------

  U0C0_INPRL     =  0x0000;      // load U0C0 Interrupt Node Pointer 
register
                                 // L
  U0C0_INPRH     =  0x0000;      // load U0C0 Interrupt Node Pointer 
register
                                 // H

  /// 
-----------------------------------------------------------------------
  ///  Configuration of the U0C0 Shift Control:
  /// 
-----------------------------------------------------------------------
  ///  - Transmit/Receive LSB first is selected

  U0C0_SCTRL     =  0x0102;      // load U0C0 shift control register L
  U0C0_SCTRH     =  0x0F0F;      // load U0C0 shift control register H

  /// 
-----------------------------------------------------------------------
  ///  Configuration of the U0C0 Transmit Control/Status Register:
  /// 
-----------------------------------------------------------------------

  U0C0_TCSRL     =  0x0500;      // load U0C0 transmit control/status
                                 // register L
  U0C0_TCSRH     =  0x0000;      // load U0C0 transmit control/status
                                 // register H

  /// 
-----------------------------------------------------------------------
  ///  Configuration of the U0C0 Protocol Control Register:
  /// 
-----------------------------------------------------------------------

  U0C0_PCRL      =  0x0F47;      // load U0C0 protocol control register 
L
  U0C0_PCRH      =  0x0001;      // load U0C0 protocol control register 
H

  /// 
-----------------------------------------------------------------------
  ///  Configuration of the U0C0 Protocol Status Register:
  /// 
-----------------------------------------------------------------------
  ///  - TBIF is set to simplify polling

  U0C0_PSR      |=  0x2000;      // load U0C0 protocol status register


  /// 
-----------------------------------------------------------------------
  ///  Configuration of the used U0C0 Interrupts:
  /// 
-----------------------------------------------------------------------
  /// 
-----------------------------------------------------------------------
  ///  Configuration of the used U0C0 Port Pins:
  /// 
-----------------------------------------------------------------------
  ///  - Receive Pin is not selected for the module
  ///  - P2.3 is used for USIC0 Channel0 Shift Data Output(DOUT)
  ///  - P2.5 is used for USIC0 Channel0 Shift Clock Output(SCLKOUT)
  ///  - P2.6 is used for USIC0 Channel0 Shift Control output0(SELO0)
  ///  - P2.7 is used for USIC0 Channel0 Shift Control output1(SELO1)

  P2_IOCR03 = 0x0090;    //set direction register
  P2_IOCR05 = 0x0090;    //set direction register
  P2_IOCR06 = 0x0090;    //set direction register
  P2_IOCR07 = 0x00A0;    //set direction register


}


//********************************************************************** 
******
// @Function      void U0C0_SSC_vSendData(uword uwData)
//
//---------------------------------------------------------------------- 
------
// @Description   This function clears the transmit buffer Indication 
flag
//                first  & then writes the send data initialization word 
into
//                the transmit buffer register.
//
//                Note:
//                In a multiprocessor system the master with this 
function
//                has the possibility to send data to the selected 
slave.

//********************************************************************** 
******


void U0C0_SSC_vSendData(uword uwData)
{

  while(!(U0C0_PSR & 0x2000));   //  wait until tx buffer indication 
flag is set

  U0C0_PSCR     |= 0x2000;   //  clear transmit buffer indication flag
  U0C0_TBUF00    = uwData;   //  load transmit buffer register

}

//********************************************************************** 
******
// @Function      ubyte U0C0_SSC_ubTxDataReady(void)
//
//---------------------------------------------------------------------- 
------
// @Description   This function can be used for checking up the status 
of the
//                transmit shift indication flag U0C0_PSR_TSIF. This 
function
//                shows when the sending of data has terminated. By
//                continuously polling this flag after the function
//                U0C0_SSC_vSendData has been called, it is possible to
//                establish when U0C0 has terminated its task.
//
//---------------------------------------------------------------------- 
------
// @Returnvalue   0 if transmitter is busy, else 1

ubyte U0C0_SSC_ubTxDataReady(void)
{
  ubyte ubReturnValue;

  ubReturnValue = 0;

  if(U0C0_PSR & 0x1000)               // if sending of data is 
terminated
  {
    ubReturnValue = 1;
    U0C0_PSCR |= 0x1000;
  }
  return(ubReturnValue);

}




Vielleicht kann mir jemand von euch weiterhelfen, da ich mit meinem 
Latein am Ende bin.

Gruß Stefan