Not coming out of Interrupt routine

[rgovindappa9]

Posted on March 02, 2011 at 11:48 I am using the following code for master and slave handling. When I send data from master to slave without using the interrupt routine below(by disabling intterupts) it works fine. BUT when I use interrupt routine it never comes out of it, please help  me correcting it #stm8s-discovery

[rgovindappa9]

Posted on March 02, 2011 at 11:49

My interrupt routine is as below:

@far @interrupt void I2C_IRQHandler(void)  /* I2C Interrupt handler*/ {  //Handle I2C interrupts here  I2C_HandleEvents();  return;  }     void I2C_HandleEvents() {  char tmp1, tmp2;     #ifdef _MASTER_MODE_  /*Need to remove repeting events*/  /* MASTER EVENTS*/       /*MASTER TRANSMITTER, read-write byte=0*/  /*Start bit sent from Master*/  /* EV5: SB=1, cleared by reading SR1 register followed by writing DR register with Address */  if(I2C_CheckEvent(I2C_EVENT_MASTER_START_SENT))  {   I2C_ClearFlag(I2C_FLAG_STARTDETECTION);   I2C.DR = I2C.DR;//Dummy write  }  /* master address acknowledged */  /*EV6:ADDR=1, cleared by reading SR1 register followed by reading SR3*/    else if(I2C_CheckEvent(I2C_EVENT_MASTER_ADDRESS_ACKED))  {   I2C_ClearFlag(I2C_FLAG_ADDRESSSENTMATCHED);  }  /*Master byte transmitted*/  /*EV8_1: TxE=1, shift register empty, data register empty, write DR register*/  else if(I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTED))  {   I2C.DR = I2C.DR;//Dummy write   I2C_ClearFlag(I2C_FLAG_TRANSFERFINISHED);  }  /*Master byte being transmitted now*/  /*EV8: TxE=1, shift register not empty, data register empty, cleared by writing DR register.*/  else if(I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTING))  {   I2C.DR = I2C.DR;//Dummy write   I2C_ClearFlag(I2C_FLAG_TRANSFERFINISHED);  }  /*Stop bit sent*/  /*EV8_2: TxE=1, BTF = 1, Program STOP request. TxE and BTF are cleared by HW by stop condition*/  else if(I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTED))  {    I2C_GenerateSTOP(ENABLE);  }      /*MASTER RECEIVER, read-write byte=1*/    /*Start bit sent from Master*/  /* EV5: SB=1, cleared by reading SR1 register followed by WRITING DR register with Address */  /*else if(I2C_CheckEvent(I2C_EVENT_MASTER_START_SENT))  {   I2C_ClearFlag(I2C_FLAG_STARTDETECTION);   I2C.DR = I2C.DR;//Dummy write  }*/  /*EV6:ADDR=1, cleared by reading SR1 register followed by reading SR3*/  /*else if(I2C_CheckEvent(I2C_EVENT_MASTER_ADDRESS_ACKED))  {   I2C_ClearFlag(I2C_FLAG_ADDRESSSENTMATCHED);  } */   else if(I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_RECEIVED))   {   /*EV7_1: RxNE=1, cleared by reading DR register, program ACK=0 and STOP request*/   if(I2C_GetFlagStatus(I2C_FLAG_ACKNOWLEDGEFAILURE))   {    //I2C_ClearFlag(I2C_FLAG_ADDRESSSENTMATCHED);    tmp1 = I2C.DR;        I2C.CR2 &=~(I2C_CR2_ACK);        I2C_GenerateSTOP(ENABLE);   }   /*EV7: RxNE=1, cleared by reading DR register*/     else   {    //User different variable for read to care of compiler optimization    tmp2 = I2C.DR;   }  }  /* EV6_1: How is the single byte transfer info provided beforehand? */  /* EV6_1: used for 1 byte reception only. Program ACK=0 and STOP=1 after clearing ADDR.*/    else if(I2C_CheckEvent(I2C_EVENT_SLAVE_ACK_FAILURE))   {   I2C_ClearFlag(I2C_FLAG_ACKNOWLEDGEFAILURE);   I2C.SR1 &=~(I2C_SR1_ADDR);   I2C.CR2 &=~(I2C_CR2_ACK);       //I2C_GenerateSTOP(ENABLE);   }  /* slave detected stop command from master */   /*else if(I2C_CheckEvent(I2C_EVENT_SLAVE_STOP_DETECTED))   {    } */  #else //Slave mode          /* SLAVE EVENTS */       /* SLAVE RECEIVER */  /* Slave address matched with the address sent by master */  /* EV1: ADDR =1, cleared by reading SR1 register followed by reading SR3.*/  if(I2C_CheckEvent(I2C_EVENT_SLAVE_ADDRESS_MATCHED))   {     I2C_ClearFlag(I2C_FLAG_ADDRESSSENTMATCHED);   }  /* slave received the date byte from master */  /*EV2: RxNE=1, cleared by reading DR register*/   else if(I2C_CheckEvent(I2C_EVENT_SLAVE_BYTE_RECEIVED))   {   I2C_ClearFlag(I2C_FLAG_TRANSFERFINISHED);   }  /* Slave received STOP byte from master */  /*EV4: STOPF=1, cleared by reading SR1 register followed by dummy writing CR2 register*/   else if(I2C_CheckEvent(I2C_EVENT_SLAVE_STOP_DETECTED))   {   I2C_ClearFlag(I2C_FLAG_STOPDETECTION);   }

 /*SLAVE TRANSMITTER*/

 /*Slave address matched with the address sent by master*/  /* EV1: ADDR =1, cleared by reading SR1 register followed by reading SR3.*/  /*if(I2C_CheckEvent(I2C_EVENT_SLAVE_ADDRESS_MATCHED))   {     I2C_ClearFlag(I2C_FLAG_ADDRESSSENTMATCHED);   }*/  /*Data transmited from slave to master*/  /*EV3: TxE=1, cleared by writing DR; shift register not empty*/  else if(I2C_CheckEvent(I2C_EVENT_SLAVE_BYTE_TRANSMITTED))   {     //I2C_ClearFlag(I2C_FLAG_TRANSFERFINISHED);   //Dummy write   I2C.DR = I2C.DR;   }  /*Acknowledge failure*/  /*EV3-2: AF=1, AF is cleared by writing ‘0’ in AF bit of SR2 register*/  else if(I2C_CheckEvent(I2C_EVENT_SLAVE_ACK_FAILURE))   {     I2C_ClearFlag(I2C_FLAG_ACKNOWLEDGEFAILURE);   }       #endif    return; }

[rgovindappa9]

Posted on March 02, 2011 at 11:52

My Main routine is:

 I2C_DeInit();  _asm(''rim\n'');  I2C_Cmd(ENABLE);  I2C_ITConfig((I2C_IT_EVT |I2C_IT_BUF | I2C_IT_ERR), ENABLE);  I2C_Init(100000, 0x48, I2C_DUTYCYCLE_2, I2C_ACK_CURR, I2C_ADDMODE_7BIT, 2);   while(I2C_GetFlagStatus(I2C_FLAG_BUSBUSY));    I2C_GenerateSTART(ENABLE);     I2C_Send7bitAddress(0x40, I2C_DIRECTION_TX);  I2C_SendData(0x22);   I2C_GenerateSTOP(ENABLE);