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

[harinath]

Posted on July 19, 2012 at 09:48

I have STM32-P103 board which uses STM32F103RB micro. I connected I2C sensors to I2C2 pins as shown below :

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. I 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_BufferReadfunction just after initialization.Execution hangs at

/* Test on EV6 and clear it */
while
(!I2C_CheckEvent(MPU6050_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

Any helpappreciated. Below is the I2C analyzer debug information.

https://dl.dropbox.com/u/14046521/I2C_problem.png

https://dl.dropbox.com/u/14046521/I2C_good.png

Thank you #i2c #i2c #accelerometer

[Tesla DeLorean]

Posted on February 06, 2014 at 19:16

Good new you figured this out, but is there any reason no one suggested you use STM Gyroscope PN LSM330DLC ? ST is the leader in accelerometer/ gyro and MEMS technology in general,  and their support is phenomenal.

Which is all well and good 18 months down the pike, but ignores the fact the OP was using something else, not least, based on the community support and utilization in many other designs. Sometimes you work with what you have.ST's support is barely visible on this forum, so you're point is what exactly? The thread would seem ample illustration of that.