STM32F4Discovery i2c using

[salperogan9]

Posted on January 22, 2013 at 12:39

I need to use I2C1 ports for communication with LG3D20(0xD6 adress) gyro sensor.Accordingly, i need i2c1 initial,i2c1 write data 1 byte,i2c1 read data 1 byte functions.I am using these functions but i couldnt run this function in program flow.The program always lockups at I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY).Please give me an tried example for stm32f4discovery i2c1.My codes are here:

/*  I2C1  */  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);  GPIO_PinAFConfig(GPIOB,GPIO_PinSource6, GPIO_AF_I2C1);  GPIO_PinAFConfig(GPIOB,GPIO_PinSource7, GPIO_AF_I2C1);  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;;  GPIO_Init(GPIOB, &GPIO_InitStructure);  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;  GPIO_Init(GPIOB, &GPIO_InitStructure);I2C_DeInit(I2C1); RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);    I2C_init.I2C_Mode = I2C_Mode_I2C;    I2C_init.I2C_ClockSpeed = 100000;    I2C_init.I2C_DutyCycle = I2C_DutyCycle_2;    I2C_init.I2C_OwnAddress1 = 0;    I2C_init.I2C_Ack = I2C_Ack_Enable;    I2C_init.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;  I2C_Cmd(I2C1,ENABLE);    I2C_Init(I2C1,&I2C_init);   unsigned short int I2C1_read(uint8_t adress, uint8_t index)   {    uint8_t data;   while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));    I2C_GenerateSTART(I2C1, ENABLE);    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));    I2C_Send7bitAddress(I2C1, adress, I2C_Direction_Transmitter);    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));    I2C_SendData(I2C1, index);    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));    I2C_GenerateSTART(I2C1, ENABLE);    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));    I2C_Send7bitAddress(I2C1, adress, I2C_Direction_Receiver);    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));    data=I2C_ReceiveData(I2C1);    I2C_GenerateSTOP(I2C1, ENABLE); return data;   } void I2C1_write(uint8_t adress, uint8_t * data) {    uint8_t i=0;    while (i < 7)  {        while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));        I2C_GenerateSTART(I2C1, ENABLE);        while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));        I2C_Send7bitAddress(I2C1, adress, I2C_Direction_Transmitter);        while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));        I2C_SendData(I2C1, data[i]);        while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));        I2C_SendData(I2C1,i + 1);        while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));        I2C_GenerateSTOP(I2C2, ENABLE);        i+=2;    } }int main(void){ uint8_t timer_value,flag=0,i=0; char buffer[8]; uint8_t deger; I2C1_Initialize();  while (1)  { deger=I2C2_read(0x3C,0x20); sprintf(buffer,''%d'',deger); USART3_Write_Text(buffer); USART3_Write_Text(''\n\r''); }}I need read,write,initial functions for stm32f4discovery kit's I2C1!!! #stm32f4discovery-i2c1-problem!!!