Hello,

First of all,thank you for reading my post. I would like to ask some help about STM8.

The MCU I used is STM809LWX6F, this is the datsheet of STM809LWX6F: http://www.kynix.com/uploadfiles/pdf8798/STM809LWX6F.pdf . All interrupt events I have listed out as following, I really don’t know why it still always enter into interruption?

NTERRUPT_HANDLER(I2C_IRQHandler, 19)<br />{<br />  /* In order to detect unexpected events during development,<br />     it is recommended to set a breakpoint on the following instruction.<br />  */<br />  if(I2C->SR2)<br />  {<br />      I2C->SR2 = 0;<br />  }<br />  if(I2C_GetITStatus(I2C_ITPENDINGBIT_STARTDETECTION))<br />  {<br />      I2C_ClearITPendingBit(I2C_ITPENDINGBIT_STARTDETECTION);<br />      IIC_Receive_event = 1;        //START<br />  }<br />  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_STOPDETECTION))<br />  {<br />      ////I2C_ClearITPendingBit(I2C_ITPENDINGBIT_STOPDETECTION);<br />      IIC_Receive_event = 3;        //STOP<br />  }<br />  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_RXNOTEMPTY))<br />  {<br />     //// I2C_ClearITPendingBit(I2C_ITPENDINGBIT_RXNOTEMPTY);<br />      IIC_Receive_data = I2C_ReceiveData();<br />      IIC_Receive_event = 2;        //receive data<br />  }<br />  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_TXEMPTY))<br />  {<br />      ////I2C_ClearITPendingBit(I2C_ITPENDINGBIT_TXEMPTY);<br />      IIC_Receive_event = 4;        //send register invoid<br />  }<br />  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_TRANSFERFINISHED))  //send successfully <br />  {<br />      I2C_ClearITPendingBit(I2C_ITPENDINGBIT_TRANSFERFINISHED);<br />  }<br />  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_HEADERSENT))  //send successfully    <br />  {<br />      I2C_ClearITPendingBit(I2C_ITPENDINGBIT_HEADERSENT);   //10-bit Header sent<br />  }    <br />  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_ADDRESSSENTMATCHED))  //send and match address successfully <br />  {<br />      I2C_ClearITPendingBit(I2C_ITPENDINGBIT_ADDRESSSENTMATCHED);  <br />  }       <br />  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_WAKEUPFROMHALT))  //aware<br />  {<br />      I2C_ClearITPendingBit(I2C_ITPENDINGBIT_WAKEUPFROMHALT);  <br />  }   <br />  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_OVERRUNUNDERRUN))  //Overrun/Underrun<br />  {<br />      I2C_ClearITPendingBit(I2C_ITPENDINGBIT_OVERRUNUNDERRUN);  <br />  }        <br />  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_ACKNOWLEDGEFAILURE))  //confirmation failed<br />  {<br />      I2C_ClearITPendingBit(I2C_ITPENDINGBIT_ACKNOWLEDGEFAILURE);  <br />  }    <br />  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_ARBITRATIONLOSS))  //!< Arbitration Loss  <br />  {<br />      I2C_ClearITPendingBit(I2C_ITPENDINGBIT_ARBITRATIONLOSS);  <br />  } <br />  else if(I2C_GetITStatus(I2C_ITPENDINGBIT_BUSERROR))  //Misplaced Start or Stop condition<br />  {<br />      I2C_ClearITPendingBit(I2C_ITPENDINGBIT_BUSERROR);     <br />  }   <br />  else<br />  {<br />      nop();<br />  }<br />      <br />}

And the initialization is given below:

I2C_ITConfig((I2C_IT_TypeDef)(I2C_IT_ERR |I2C_IT_EVT|I2C_IT_BUF),ENABLE);<br />  I2C_Init(100000,0X51,I2C_DUTYCYCLE_2,I2C_ACK_CURR,I2C_ADDMODE_7BIT,CLK_GetClockFreq());<br />  I2C_Cmd(ENABLE);

Please give me some help!

Thanks a lot.