STM32L152CBT6 und EXTI0

Hi,

ich versuche mich gerade an den Funktionen des STM32L152CBT6. LED's 
blinken lassen und ähnlich Dinge habe ich schnell erreicht. Nun wollte 
ich als nächsten Schritt einen exterenen Interrupt programmieren.
Jedoch bekomme ich das einfach nicht zum laufen.

Was ich getan habe:
- Pin konfiguration (PB0,IN,PushPull,NoPull)
- EXTI konfiguration (Line0,Interrupt,TriggerRising,Enable)
- Routing (PB0 -> EXTI0)
- NVIC Enable (EXTI0_IRQn)

Wenn mir jemand weiterhelfen könnte wäre ich sehr erfreut.

Mit freundlichen Grüßen

Roman G.

Mein Code:

/**************************************************************/
/***********************INCLUDES*******************************/
/**************************************************************/

#include <stdio.h>
#include <stdint.h>
#include "bsp/system_stm32l1xx.h"
#include "lib/STM32L1xx_StdPeriph_Driver/inc/stm32l1xx_conf.h"
#include "lib/CMSIS/CM3/CoreSupport/core_cm3.h"
#include "systemcore/pcc_common/includes/pcc_types.h"

/**************************************************************/
/***********************DEFINITIONS****************************/
/**************************************************************/

void PinInit(void);
void EXTI0Init(void);

/**************************************************************/
/***********************MAIN METHOD***********************/
/**************************************************************/

int main(void)
{
   //init peripherie
   PinInit();
   EXTI0Init();

   int i;

   while(1)
   {
     GPIO_ResetBits(GPIOA,GPIO_Pin_12);
     for (i=0;i<100000;i++);  // wait a bit
     GPIO_SetBits(GPIOA,GPIO_Pin_12);
     for (i=0;i<100000;i++);  // wait a bit
   }
}
/**************************************************************/
/**********************INTERUPT METHODS************************/
/**************************************************************/

void EXTI0_IRQHandler(void)
{
  int i;
  //Debouncer_1sec();
  GPIO_SetBits(GPIOA,GPIO_Pin_11);
  for (i=0;i<100000;i++);  // wait a bit
  GPIO_ResetBits(GPIOA,GPIO_Pin_11);
  for (i=0;i<100000;i++);  // wait a bit

  EXTI_ClearFlag(EXTI_Line0);
  EXTI_ClearITPendingBit(EXTI_Line0);
}

/**************************************************************/
/***********************INIT METHODS***************************/
/**************************************************************/

void PinInit(void)
{
   GPIO_InitTypeDef  GPIO_InitStructure;

   // Enable the GPIO_LED Clock
   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

   //setup of LEDs
   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 | GPIO_Pin_12;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_400KHz;
   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

   GPIO_Init(GPIOA, &GPIO_InitStructure);

   // Enable the GPIOB Clock
   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);

   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_400KHz;
   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

   GPIO_Init(GPIOB, &GPIO_InitStructure);
}

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

void EXTI0Init(void)
{
  //EXTI0 setup
  EXTI_InitTypeDef EXTI_InitStructure;

  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;

  EXTI_Init(&EXTI_InitStructure);

  //routing PB0 -> EXTI0
  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB,EXTI_PinSource0);

  //enable EXTI0
  NVIC_EnableIRQ(EXTI0_IRQn);
}