Posted on June 26, 2014 at 12:50Hi,
I am using STM32F215(master) in my custom board. In this controller is connected to the MPU9150 sensor(slave) via I2C interface.I tried to read the slave Id of the slave device, but i am getting whatever i am sending the slave address.Here i note down one thing, after configured the i2c always i am getting the BUSY in SR2 register. I don't know the problem, please help me asap.
Below is my configuration,read and write code for I2C.
static void I2C_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
/* GPIO Configuration */
/*Configure I2C SCL pin */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
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_UP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/*Configure I2C SDA pin */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Connect PXx to I2C_SCL */
// GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_I2C1);
/* Connect PXx to I2C_SDA */
// GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1);
I2C_DeInit(I2C1);
/*!< I2C Struct Initialize */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = 0xA0;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_Init(I2C1, &I2C_InitStructure);
I2C_Cmd(I2C1, ENABLE);
// I2C_GenerateSTART(I2C1, ENABLE);
}
void MPU_Write(unsigned char Address,unsigned char DataVal)
{
I2C_GenerateSTART(I2C1, ENABLE);
I2C_SendData(I2C1,MPU6050_SLAVE_WRT);
I2C_SendData(I2C1,Address);
I2C_SendData(I2C1,DataVal);
I2C_GenerateSTOP(I2C1, ENABLE);
}
unsigned char MPU_Read(unsigned char Address)
{
int i;
unsigned char c;
I2C_GenerateSTART(I2C1, ENABLE);
I2C_Send7bitAddress(I2C1, 0x68,I2C_Direction_Transmitter);
I2C_SendData(I2C1,Address);
I2C_Send7bitAddress(I2C1, 0x68,I2C_Direction_Receiver);
//for(i=0;i<100000000;i++);
c=I2C_ReceiveData(I2C1);
I2C_GenerateSTOP(I2C1, ENABLE);
return c;
}
Advance thanks for your help.
Regards,
Thirukkannan.P
