STM32为何一上电就进中断

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ybxdy|

楼主 | 2008-9-21 09:06 | 只看该作者回帖奖励

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STM32, TI, IO, pi, GPIO

以下我的中断设置：用的是IOB0作中断源，不知道为何一上电就进中断，在程序里却有时进，有时不进中断。
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_SPI1 | RCC_APB2Periph_AFIO, ENABLE);// 使能GPIOB时钟

/*IOB0开放外部中断*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource0);

NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

void EXTI_Configuration(void)
{ EXTI_InitTypeDef EXTI_InitStructure;
  EXTI_DeInit();
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource0);
  EXTI_InitStructure.EXTI_Line = EXTI_Line0 | EXTI_Line1;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
//  EXTI_GenerateSWInterrupt(EXTI_Line0);
}

void EXTI0_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line0) != RESET)
  {    /* Clear the EXTI line 9 pending bit */
    EXTI_ClearITPendingBit(EXTI_Line0);
    GPIO_SetBits(GPIOB, GPIO_Pin_8 );
    sta=1;
//   delay();
  }
}

都是参考例程写的，不知道错在那里，IOB0接一个按键，按下时接GND。

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