[Stm32] Unerklärliches I2C Busy Flag

Hallo Community

Bei meiner Eeprom Routine ( adaptiert aus den Examples ) liegt ewig das 
I2C Busy Flag an und die Kommunikation erzeugt ein Timeout. Hier erstmal 
der Sourcecode:

void sEE_LowLevel_Init(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;

  /*!< sEE_I2C_SCL_GPIO_CLK and sEE_I2C_SDA_GPIO_CLK Periph clock enable 
*/
  RCC_APB2PeriphClockCmd(sEE_I2C_SCL_GPIO_CLK | sEE_I2C_SDA_GPIO_CLK, 
ENABLE);

  /*!< sEE_I2C Periph clock enable */
  RCC_APB1PeriphClockCmd(sEE_I2C_CLK, ENABLE);

  /*!< GPIO configuration */
  /*!< Configure sEE_I2C pins: SCL */
  GPIO_InitStructure.GPIO_Pin = sEE_I2C_SCL_PIN;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
  GPIO_Init(sEE_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);

  /*!< Configure sEE_I2C pins: SDA */
  GPIO_InitStructure.GPIO_Pin = sEE_I2C_SDA_PIN;
  GPIO_Init(sEE_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);
}

void sEE_Init(void)
{
  I2C_InitTypeDef  I2C_InitStructure;

  sEE_LowLevel_Init();

  /*!< I2C configuration */
  /* sEE_I2C configuration */
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
  I2C_InitStructure.I2C_OwnAddress1 = I2C_SLAVE_ADDRESS7;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
  I2C_InitStructure.I2C_AcknowledgedAddress = 
I2C_AcknowledgedAddress_7bit;
  I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;

  /* sEE_I2C Peripheral Enable */
  I2C_Cmd(sEE_I2C, ENABLE);
  /* Apply sEE_I2C configuration after enabling it */
  I2C_Init(sEE_I2C, &I2C_InitStructure);

  /* Enable the sEE_I2C peripheral DMA requests */
  I2C_DMACmd(sEE_I2C, ENABLE);

  /*!< Select the EEPROM address */
  sEEAddress = sEE_HW_ADDRESS;
}


uint32_t sEE_ReadBuffer(uint8_t* pBuffer, uint16_t ReadAddr, uint16_t* 
NumByteToRead)
{
  /* Set the pointer to the Number of data to be read. This pointer will 
be used
      by the DMA Transfer Completer interrupt Handler in order to reset 
the
      variable to 0. User should check on this variable in order to know 
if the
      DMA transfer has been complete or not. */
  sEEDataReadPointer = NumByteToRead;

  /*!< While the bus is busy */
  sEETimeout = sEE_LONG_TIMEOUT;
  while(I2C_GetFlagStatus(sEE_I2C, I2C_FLAG_BUSY))
  {
    if((sEETimeout--) == 0) return 11;
    //sEE_TIMEOUT_UserCallback();
  }


In der While Schleife hat er sein timeout. Ich kann die Var sEETimeout 
so hoch wie ich will einstellen der Bus wird niemals frei.

Mit dem Oszilloskop hab ich es geprüft. Da ist nixs auf den 
Signalleitungen.

Wie kommt es zu diesem Problem kann mir jmd helfen ?


mfg Jan