STM32F103RET6,PB4，PB5作为外部中断问题

只看该作者 · 2016-3-22 13:42

碰到一个好奇怪的问题，PB4，PB5作为外部中断，所有配置PB4和PB5的配置都一样，PB4只要一配置为外部中断，不管上升沿还是下降沿始终进中断。PB5就不会。PB4的JTAG功能已经关闭。
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);

GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource4 | GPIO_PinSource5);
EXTI_InitStructure.EXTI_Line = EXTI_IMR_MR4;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);

EXTI_InitStructure.EXTI_Line = EXTI_IMR_MR5;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);

/* Enable the EXTI4 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

/* Enable the EXTI9_5 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

void EXTI4_IRQHandler(void)
{
CLI();
if(EXTI_GetITStatus(EXTI_IMR_MR4) != RESET)
{
      /* Clear the Key Button EXTI line pending bit */
//       m_u8KeyPress_Flag = ENABLE;
      EXTI_ClearITPendingBit(EXTI_IMR_MR4);
      if ((GPIOB->IDR & GPIO_Pin_4) == (uint32_t)Bit_RESET)
      {
         m_u8KeyReadValue &= ~0x01;
      }
      else
      {
         m_u8KeyReadValue |= 0x01;
      }
}
SEI();
}
void EXTI9_5_IRQHandler(void)
{
CLI();
if(EXTI_GetITStatus(EXTI_IMR_MR5) != RESET)
{
      /* Clear the Key Button EXTI line pending bit */
      EXTI_ClearITPendingBit(EXTI_IMR_MR5);
      if ((GPIOB->IDR & GPIO_Pin_5) == (uint32_t)Bit_RESET)
      {
         m_u8KeyReadValue &= ~0x02;
      }
      else
      {
         m_u8KeyReadValue |= 0x02;
      }
}
SEI();
}
大家看看哪里有问题啊？

只看该作者 · 2016-3-22 13:44

示波器测量PB4始终为高电平。

只看该作者 · 2016-3-22 14:57

GPIOB和AFIO已经都使能了，实在不知道问题所在了，是不是还有哪里忘记设置了，其他管脚的外部中断也是这么设置的都能用的。

只看该作者 · 2016-3-22 15:01

网上查了下好多人都碰到这个问题了，这不是STM32的一个BUG啊

只看该作者 · 2016-3-22 16:11

怎么没人来参与下呢

只看该作者 · 2016-3-22 21:51

建议楼主先用示波器测试一下PB4的输入信号是否正常