Posted on May 17, 2011 at 13:14I use I2C2 to comunicate between STM32 and another device that his address is 0x5E .
I take the function that do read and write (in polling) from the examples of the STM32 I2C example5 .
The problem is :
when I enabled interrupts , after few cycles (write and read)of I2C work the I2C is stuck and dont exit from the function and all the firmware is stuck .
when I disabled the interrupts it is work very good .
this is the function :
void I2C_Write(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite)
{
/* While the bus is busy */
while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY));
/* Send START condition */
I2C_GenerateSTART(I2C2, ENABLE);
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));
/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C2, 0x5E, I2C_Direction_Transmitter);
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
/* Send the EEPROM's internal address to write to */
I2C_SendData(I2C2, WriteAddr);
/* Test on EV8 and clear it */
while(! I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* While there is data to be written */
while(NumByteToWrite--)
{
/* Send the current byte */
I2C_SendData(I2C2, *pBuffer);
/* Point to the next byte to be written */
pBuffer++;
/* Test on EV8 and clear it */
while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
}
/* Send STOP condition */
I2C_GenerateSTOP(I2C2, ENABLE);
}
void I2C_Read(u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)
{
/* While the bus is busy */
while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY));
/* Send START condition */
I2C_GenerateSTART(I2C2, ENABLE);
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));
/* Send EEPROM address for write */
I2C_Send7bitAddress(I2C2, 0x5E, I2C_Direction_Transmitter);
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
/* Clear EV6 by setting again the PE bit */
I2C_Cmd(I2C2, ENABLE);
/* Send the EEPROM's internal address to write to */
I2C_SendData(I2C2, ReadAddr);
/* Test on EV8 and clear it */
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
/* Send STRAT condition a second time */
I2C_GenerateSTART(I2C2, ENABLE);
/* Test on EV5 and clear it */
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));
/* Send EEPROM address for read */
I2C_Send7bitAddress(I2C2, 0x5E, I2C_Direction_Receiver);
/* Test on EV6 and clear it */
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
/* While there is data to be read */
while(NumByteToRead)
{
if(NumByteToRead == 1)
{
/* Disable Acknowledgement */
I2C_AcknowledgeConfig(I2C2, DISABLE);
/* Send STOP Condition */
I2C_GenerateSTOP(I2C2, ENABLE);
}
/* Test on EV7 and clear it */
if(I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED))
{
/* Read a byte from the EEPROM */
*pBuffer = I2C_ReceiveData(I2C2);
/* Point to the next location where the byte read will be saved */
pBuffer++;
/* Decrement the read bytes counter */
NumByteToRead--;
}
}
/* Enable Acknowledgement to be ready for another reception */
I2C_AcknowledgeConfig(I2C2, ENABLE);
}
wait to your assistant
