I2C Error function I2C_Send7bitAddress

/* Includes ------------------------------------------------------------------*/
#include "stm32F10x.h"
#include "stm32f10x_i2c.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ClockSpeed            400000
#define I2C_SLAVE_ADDRESS7      0x74
#define PCF8535_FLAG_TIMEOUT         ((uint32_t)0x1000)
#define PCF8535_LONG_TIMEOUT         ((uint32_t)(10 * sEE_FLAG_TIMEOUT))
/* Private macro -------------------------------------------------------------*/
/* Private consts ------------------------------------------------------------*/

/* Private variables ---------------------------------------------------------*/
u32 count = 0;

GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;

/* Private function prototypes -----------------------------------------------*/

int main(void)
{

  /* Enable GPIOx Clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO , ENABLE);

  /* Initialise GPIO port */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* Enables the specified I2C peripheral. */
  I2C_Cmd(I2C1, ENABLE);

  /* Initialise I2C */
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
  I2C_InitStructure.I2C_OwnAddress1 = 0x78;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Disable ;
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_InitStructure.I2C_ClockSpeed = ClockSpeed;
  I2C_Init(I2C1, &I2C_InitStructure);
  while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY));

  I2C_GenerateSTART(I2C1, ENABLE);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));

  I2C_Send7bitAddress(I2C1, 0x78, I2C_Direction_Transmitter);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ));

  I2C_SendData(I2C1, I2C_SLAVE_ADDRESS7);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ));
  I2C_SendData(I2C1, 0x01);
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ));
//  I2C_SendData(I2C1, 0x20);
//  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ));
//  I2C_SendData(I2C1, 0x09);
//  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED ));
  I2C_GenerateSTOP(I2C1, ENABLE);

  /* main while */
  while(1)
  {
   }
}