i2c stucked on EV6

Firmware/software/electronics/mechanics
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almaz_1c
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Posts: 43
Joined: Tue Dec 09, 2014 12:58 pm

i2c stucked on EV6

Post by almaz_1c » Mon Dec 29, 2014 6:29 pm

Hello all. I need advice. I try to communicate with mpu6050 on my crazyflie in most simple way, without any DMA or interupt handling.
In my main() function:

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	MPU6050_I2C_Init();
	uint8_t tmp = 0;
    MPU6050_I2C_BufferRead(0x69<<1, &tmp, 0x75, 1);
Realization of this two functions:

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    void MPU6050_I2C_Init()
{
    I2C_InitTypeDef I2C_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

	/* GPIOB clock enable */
	RCC_APB2PeriphClockCmd(MPU6050_I2C_RCC_Port, ENABLE);
	/* I2C1 clock enable */
	RCC_APB1PeriphClockCmd(MPU6050_I2C_RCC_Periph, ENABLE);
	/* I2C1 SDA and SCL configuration */
	GPIO_InitStructure.GPIO_Pin = MPU6050_I2C_SCL_Pin;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	GPIO_InitStructure.GPIO_Pin = MPU6050_I2C_SDA_Pin;
	GPIO_Init(GPIOB, &GPIO_InitStructure);

	/* Enable I2C1 reset state */
	RCC_APB1PeriphResetCmd(MPU6050_I2C_RCC_Periph, ENABLE);
	/* Release I2C1 from reset state */
	RCC_APB1PeriphResetCmd(MPU6050_I2C_RCC_Periph, DISABLE);

	/* I2C1 and I2C2 configuration */
	I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
	I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
	I2C_InitStructure.I2C_OwnAddress1 = 0x69;
	I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
	I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
	I2C_InitStructure.I2C_ClockSpeed = 400000;
	I2C_Init(MPU6050_I2C, &I2C_InitStructure);

}

void MPU6050_I2C_BufferRead(u8 slaveAddr, 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 for write */
    I2C_Send7bitAddress(MPU6050_I2C, slaveAddr, I2C_Direction_Transmitter);

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

    /* Clear EV6 by setting again the PE bit */
    I2C_Cmd(MPU6050_I2C, ENABLE);

    /* Send the MPU6050'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, slaveAddr, 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();
}

Headers are:

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#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
#define MPU6050_I2C_RCC_Port         RCC_APB2Periph_GPIOB
#define MPU6050_I2C_Speed            400000 // 400kHz standard mode
My program always stucked on EV6 event:

Code: Select all

   /* Test on EV6 and clear it */
    while (!I2C_CheckEvent(MPU6050_I2C, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
What i miss? Thank you.



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