STM8 IIC 一直进中断

2017-6-6 10:41

INTERRUPT_HANDLER(I2C_IRQHandler, 19)
{
  /* In order to detect unexpected events during development,
   it is recommended to set a breakpoint on the following instruction.
  */
  if(I2C->SR2)
  {
   I2C->SR2 = 0;
  }
  if(I2C_GetITStatus(I2C_ITPENDINGBIT_STARTDETECTION))
  {
   I2C_ClearITPendingBit(I2C_ITPENDINGBIT_STARTDETECTION);
   IIC_Receive_event = 1;       //START
  }
  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_STOPDETECTION))
  {
   ////I2C_ClearITPendingBit(I2C_ITPENDINGBIT_STOPDETECTION);
   IIC_Receive_event = 3;       //STOP
  }
  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_RXNOTEMPTY))
  {
   //// I2C_ClearITPendingBit(I2C_ITPENDINGBIT_RXNOTEMPTY);
   IIC_Receive_data = I2C_ReceiveData();
   IIC_Receive_event = 2;       //接收到数据
  }
  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_TXEMPTY))
  {
   ////I2C_ClearITPendingBit(I2C_ITPENDINGBIT_TXEMPTY);
   IIC_Receive_event = 4;       //发送寄存器空
  }
  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_TRANSFERFINISHED))  //发送完成
  {
   I2C_ClearITPendingBit(I2C_ITPENDINGBIT_TRANSFERFINISHED);
  }
  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_HEADERSENT))  //发送完成
  {
   I2C_ClearITPendingBit(I2C_ITPENDINGBIT_HEADERSENT); //10-bit Header sent
  }
  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_ADDRESSSENTMATCHED))  //地址发送完成/匹配
  {
   I2C_ClearITPendingBit(I2C_ITPENDINGBIT_ADDRESSSENTMATCHED);
  }
  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_WAKEUPFROMHALT))  //唤醒
  {
   I2C_ClearITPendingBit(I2C_ITPENDINGBIT_WAKEUPFROMHALT);
  }
  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_OVERRUNUNDERRUN))  //Overrun/Underrun
  {
   I2C_ClearITPendingBit(I2C_ITPENDINGBIT_OVERRUNUNDERRUN);
  }
  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_ACKNOWLEDGEFAILURE))  //确认失败
  {
   I2C_ClearITPendingBit(I2C_ITPENDINGBIT_ACKNOWLEDGEFAILURE);
  }
  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_ARBITRATIONLOSS))  //!< Arbitration Loss
  {
   I2C_ClearITPendingBit(I2C_ITPENDINGBIT_ARBITRATIONLOSS);
  }
  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_BUSERROR))  //Misplaced Start or Stop condition
  {
   I2C_ClearITPendingBit(I2C_ITPENDINGBIT_BUSERROR);
  }
  else
  {
   nop();
  }

}
我所有的中断事件都列举出来了，还是会一直进入中断，nop()这个位置。出来后又进，崩溃了。
初始化如下
I2C_ITConfig((I2C_IT_TypeDef)(I2C_IT_ERR |I2C_IT_EVT|I2C_IT_BUF),ENABLE);
  I2C_Init(100000,0X51,I2C_DUTYCYCLE_2,I2C_ACK_CURR,I2C_ADDMODE_7BIT,CLK_GetClockFreq());
  I2C_Cmd(ENABLE);
请指点，谢谢大家

2017-6-6 12:14

那程序里，把所有的中断标志位都清下看看

2017-6-6 12:33

估计是中断标志没有清除引起的.
最好借助仿真器看一下外设寄存器.

2017-6-6 13:22

I2C->SR1 I2C->SR2 I2C->SR3全部清也不行。示波器观察一下，发现我主机的IIC_SCL是没上拉的（这个不能更改，原来是挂的24C02，主机模拟IIC，SCL不需要上拉），上电复位前是低的，然后来了个高电平。相当于产生一个STOP,STM8作为从机就不正常了。不正常时SCL被STM8 一直拉低了

2017-6-6 14:05

本帖最后由 wsl_5631 于 2017-6-6 14:21 编辑

else if(I2C_GetITStatus(I2C_ITPENDINGBIT_STOPDETECTION))
  {
   ////I2C_ClearITPendingBit(I2C_ITPENDINGBIT_STOPDETECTION);
   IIC_Receive_event = 3;       //STOP
  }
明明 SR1 = 0X10 为什么就是不进这个分支，就是判断不到这个标志