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I2C1 hangs at while(!I2C_CheckEvent(MPU6050_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

Question asked by Reddy.Harinadha on Jul 19, 2012
Latest reply on Feb 6, 2014 by Clive One
I have STM32-P103 board which uses STM32F103RB micro. I connected I2C sensors to I2C2 pins as shown below : 
STM32_MPU6050_new.png
I use only 4 pins of the sensor, SCL, SDA, Vcc, GND. I have the following Initialization code & reading code:
#define MPU6050_I2C                  I2C2
#define MPU6050_I2C_RCC_Periph       RCC_APB1Periph_I2C2
#define MPU6050_I2C_Port             GPIOB
#define MPU6050_I2C_SCL_Pin          GPIO_Pin_10
#define MPU6050_I2C_SDA_Pin          GPIO_Pin_11
#define MPU6050_I2C_RCC_Port         RCC_APB2Periph_GPIOB
#define MPU6050_I2C_Speed            100000
 
void MPU6050_I2C_Init(void)
{
  I2C_InitTypeDef  I2C_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
 
  /* Enable I2C and GPIO clocks */
  RCC_APB1PeriphClockCmd(MPU6050_I2C_RCC_Periph, ENABLE);
  RCC_APB2PeriphClockCmd(MPU6050_I2C_RCC_Port, ENABLE);
 
  /* Configure I2C pins: SCL and SDA */
  GPIO_InitStructure.GPIO_Pin =  MPU6050_I2C_SCL_Pin | MPU6050_I2C_SDA_Pin;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
  GPIO_Init(MPU6050_I2C_Port, &GPIO_InitStructure);
 
   I2C_DeInit(MPU6050_I2C);           
  /* I2C Peripheral Enable */          
   I2C_Cmd(MPU6050_I2C, ENABLE);
  
  /* I2C configuration */
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
  I2C_InitStructure.I2C_OwnAddress1 = 0xD0; // MPU6050 7-bit adress = 0x68, 1-bit left shifted adress = 0xD0;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_InitStructure.I2C_ClockSpeed = MPU6050_I2C_Speed;
   
  /* Apply I2C configuration after enabling it */
  I2C_Init(MPU6050_I2C, &I2C_InitStructure);
   
}
void I2C_BufferRead(u8 slAddr, u8* pBuffer, u8 ReadAddr, u16 NumByteToRead)
{
 // ENTR_CRT_SECTION();
 
  /* While the bus is busy */
  while(I2C_GetFlagStatus(MPU6050_I2C, I2C_FLAG_BUSY));
 
  /* Send START condition */
  I2C_GenerateSTART(MPU6050_I2C, ENABLE);
 
  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(MPU6050_I2C, I2C_EVENT_MASTER_MODE_SELECT));
 
  /* Send MPU6050 address (0xD0) for write */ 
  I2C_Send7bitAddress(MPU6050_I2C, slAddr, I2C_Direction_Transmitter);
 
  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(MPU6050_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
 
  /* Clear EV6 by setting again the PE bit */
  I2C_Cmd(MPU6050_I2C, ENABLE);
 
  /* Send the MPU6050_Magn's internal address to write to */
  I2C_SendData(MPU6050_I2C, ReadAddr);
 
  /* Test on EV8 and clear it */
  while(!I2C_CheckEvent(MPU6050_I2C, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
 
  /* Send STRAT condition a second time */
  I2C_GenerateSTART(MPU6050_I2C, ENABLE);
 
  /* Test on EV5 and clear it */
  while(!I2C_CheckEvent(MPU6050_I2C, I2C_EVENT_MASTER_MODE_SELECT));
 
  /* Send MPU6050 address for read */
  I2C_Send7bitAddress(MPU6050_I2C, slAddr, I2C_Direction_Receiver);
 
  /* Test on EV6 and clear it */
  while(!I2C_CheckEvent(MPU6050_I2C, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
 
  /* While there is data to be read */
  while(NumByteToRead)
  {
    if(NumByteToRead == 1)
    {
      /* Disable Acknowledgement */
      I2C_AcknowledgeConfig(MPU6050_I2C, DISABLE);
 
      /* Send STOP Condition */
      I2C_GenerateSTOP(MPU6050_I2C, ENABLE);
    }
 
    /* Test on EV7 and clear it */
    if(I2C_CheckEvent(MPU6050_I2C, I2C_EVENT_MASTER_BYTE_RECEIVED))
    {
      /* Read a byte from the MPU6050 */
      *pBuffer = I2C_ReceiveData(MPU6050_I2C);
 
      /* 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(MPU6050_I2C, ENABLE);
//  EXT_CRT_SECTION();
 
}

This code works fine for me as well as others.
But now i use same files in another project which uses STM32F103RE micricontroller and sensor connected to I2C1 with 10k pull-ups( this time INT pin of MPU6050 connected to PB8, but not configured), rest of the things are same.
MPU6050_I2C.pngI also modified code to use I2C1.
#define MPU6050_I2C                  I2C1
#define MPU6050_I2C_RCC_Periph       RCC_APB1Periph_I2C1
#define MPU6050_I2C_Port             GPIOB
#define MPU6050_I2C_SCL_Pin          GPIO_Pin_6
#define MPU6050_I2C_SDA_Pin          GPIO_Pin_7

I call the I2C_BufferRead function just after initialization. Execution hangs at  
/* Test on EV6 and clear it */
while
(!I2C_CheckEvent(MPU6050_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
Any help appreciated.
Below is the I2C analyzer debug information. 
I2C Debug information with Logic16 (not working)
I2C Debug info with Loigc16 for working board
Thank you

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