GPIO Ports on Keil MCB1800 with LPC1857

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Hi
I try to set an GPIO Port ( P1_15 ) to high, but it does not work. I 
used the MCB1800 Board with an LPC1857 and modified the Blinky Example.

Somebody has an idea?

Code:
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#include "board.h"
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#include <stdio.h>
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#include "stopwatch.h"
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/****************************************************************************/
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void SysTick_Handler(void)
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{
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  static int x = 0;
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  if (x++ > 500) {
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    Board_LED_Toggle(0);
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    x = 0;
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  }
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}
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/****************************************************************************/
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int main(void)
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{
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  SystemCoreClockUpdate();
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  Board_Init();
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        Chip_GPIO_Init(LPC_GPIO_PORT);
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        Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT, 1, 15);
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        Chip_GPIO_SetPinOutHigh (LPC_GPIO_PORT, 1, 15);
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  /* Enable and setup SysTick Timer at a periodic rate */
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  SysTick_Config(SystemCoreClock / TICKRATE_HZ1);
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  while (1) {
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    __WFI();
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  }
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  return 0;
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}

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