MSP430 SPI Fehler

#include<msp430.h>

#define latchPIN BIT5

#define serPIN BIT2

#define clkPIN BIT4

void WriteData(unsigned char data)

{

  P1OUT &= ~(latchPIN);

  while (!(IFG2 & UCA0TXIFG));

  UCA0TXBUF = data;

  P1OUT |= latchPIN;

}

int main()

{

  // stop watchdog-timer

  WDTCTL = WDTPW | WDTHOLD;

  // initialise special-register

  P1SEL = serPIN + clkPIN;

  P1SEL2 = serPIN + clkPIN;

  // initialise latchPIN

  P1OUT = 0x00;

  P1DIR |= latchPIN;

  // SPI configuration

  UCA0CTL1 |= UCSWRST;

  UCA0CTL0 = UCMST + UCSYNC;  // 3-pin, 8-bit SPI master

  UCA0CTL0 &= ~(UCCKPH) & ~(UCCKPL);

  UCA0CTL1 |= UCSSEL_2;                     // SMCLK

  UCA0BR0 |= 0x01;                          // /2

  UCA0BR1 = 0;                              //

  UCA0MCTL = 0;                             // No modulation

  UCA0CTL1 &= ~UCSWRST;

  unsigned char data;

  volatile int iCount, delay;

  // Hauptschleife

  for (;;)

  {

    data = 0;

    for (iCount = 7; iCount >= 0; iCount--)

    {

      // Byte senden

      WriteData(data);

      // SW Delay

      delay = 10000;

      do delay--;

      while(delay != 0);

      // weiteres bit setzen

      data |= (1 << iCount);

    }

    // letztes Byte senden

    WriteData(data);

    // SW Delay

    delay = 10000;

    do delay--;

    while(delay != 0);

      }

  return 0;

}