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Stm32L151rct6a EXTI Configuration Hang Problem

Question asked by singh.ishmeet on Oct 3, 2013
Latest reply on Oct 3, 2013 by singh.ishmeet
STM32L151RCT6A under IAR Compiler, 
board hangs when I do these steps
  /* Enable SYSCFG clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
  /* Connect EXTI1 Line to PA9 pin */
  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource9);
This is related to EXTI Configuration on PA9, to rising+falling edge in interrupt mode, I have written the code for configuration part, but it hangs when I do the above steps, when I remove them my code flows ahead, 
Has anyone encounter this problem ?