Why I am stuck in I2C_ISR_TXIS flag set?

[Ws]

I have MPU6050 accerlometer, i need to interface with stm32f0 (via I2C).

Firstly i am check if the sensor is responding by reading the

"WHO_AM_I (0x75)" Register.

If the sensor responds with 0x68, this means it’s available and good to go.

but the code is stuck in while(I2C_GetFlagStatus(I2C1, I2C_ISR_TXIS) == RESET){} ,

why this happens?

__inline static void stm32_I2cSetup(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

I2C_InitTypeDef I2C_InitStructure;

#if _I2C1_ENABLE__

/* Configure the I2C clock source. The clock is derived from the HSI */

RCC_I2CCLKConfig(RCC_I2C1CLK_HSI);

/* I2C_SCL_GPIO_CLK and I2C_SDA_GPIO_CLK Periph clock enable */

RCC_AHBPeriphClockCmd(I2C1_SCL_GPIO_CLK | I2C1_SDA_GPIO_CLK, ENABLE);

/* I2C Periph clock enable */

RCC_APB1PeriphClockCmd(I2C1_CLK, ENABLE);

/* Connect PXx to I2C_SCL*/

GPIO_PinAFConfig(I2C1_SCL_GPIO_PORT, I2C1_SCL_SOURCE, I2C1_SCL_AF);

/* Connect PXx to I2C_SDA*/

GPIO_PinAFConfig(I2C1_SDA_GPIO_PORT, I2C1_SDA_SOURCE, I2C1_SDA_AF);

/* GPIO configuration */

/* Configure I2C pins: SCL */

GPIO_InitStructure.GPIO_Pin = I2C1_SCL_PIN;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_Init(I2C1_SCL_GPIO_PORT, &GPIO_InitStructure);

/* Configure I2C pins: SDA */

GPIO_InitStructure.GPIO_Pin = I2C1_SDA_PIN;

GPIO_Init(I2C1_SDA_GPIO_PORT, &GPIO_InitStructure);

/* I2C configuration */

/* sEE_I2C configuration */

I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;

I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;

I2C_InitStructure.I2C_DigitalFilter = 0x00;

I2C_InitStructure.I2C_OwnAddress1 = 0x00;

I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;

I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;

I2C_InitStructure.I2C_Timing = I2C1_TIMING;

/* Apply sEE_I2C configuration after enabling it */

I2C_Init(I2C1, &I2C_InitStructure);

/* sEE_I2C Peripheral Enable */

I2C_Cmd(I2C1, ENABLE);

// /* Select the EEPROM address */

// SlaveAddr = 0x60;

Current_I2C = I2C1;

#endif

#if _I2C2_ENABLE__

#endif

}

void reg_read(void)

{

uint32_t Data = 0;

while(I2C_GetFlagStatus(I2C1, I2C_ISR_BUSY) != RESET){;;}

I2C_TransferHandling(I2C1,0x68, 1, I2C_Reload_Mode, I2C_Generate_Start_Write); //I2C_SoftEnd_Mode

while(I2C_GetFlagStatus(I2C1, I2C_ISR_TXIS) == RESET){}

I2C_SendData(I2C1,0x75);

while(I2C_GetFlagStatus(I2C1, I2C_ISR_TC) == RESET){}

I2C_TransferHandling(I2C1, 0x68, 1, I2C_AutoEnd_Mode,I2C_Generate_Start_Read);

while(I2C_GetFlagStatus(I2C1, I2C_ISR_RXNE) == RESET) { }

Data= I2C_ReceiveData(I2C1);

while(I2C_GetFlagStatus(I2C1, I2C_ISR_STOPF) == RESET) {}

I2C_ClearFlag(I2C1, I2C_ICR_STOPCF);

memset(ucGBuff1,0,sizeof(ucGBuff1));

sprintf((char *)ucGBuff1,"C: %d",Data);

printk((char *)ucGBuff1);

}

void printk( char* string)

{

u32 len = strlen(string);

USART_SendData(USART1,(u8 *)string,len);

}