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);