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What is calling sequence of I2C and MPU9250 function to read accelerometer data

LAXMI KANT TIWARI
Genius 3345 points
Other Parts Discussed in Thread: CC2650

Hi,

I want to read MPU9250 Accelerometer data and I am initializing it as following but I am program hangs in Mpu9250_init().

    Board_initGeneral();
    retParams = SensorI2C_open();
    retParams = SensorMpu9250_init();
    SensorMpu9250_enable(0x0F); //Acc+Gyro+Mag+WoM+-2g
    retParams = SensorMpu9250_accRead((uint16_t *)sensorData);

Can someone tell me what am I doing wrong here? 

  • 0
    TI__Guru 57865 points

    Hi,

    Maybe you should not call SensorMpu9250_init() immidiately after SensorI2C_open(), if the I2C isn't ready yet. What hardware are you running this code on? Can you debug further to see exactly where it hangs?

    Best Regards

    Joakim

  • 0 in reply to J Lindh
    Genius 3345 points

    I am using SensorTag CC2650 and I added some necessary files to support MPU9250 initialization. It compiles successfully but hangs during debugging in I2CCC26xx.c file at line no 817

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    /* Acquire the lock for this particular I2C handle */
      Semaphore_pend(Semaphore_handle(&(object->mutex)), BIOS_WAIT_FOREVER);

    Here is my initialization code 

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    /* Call board init functions */
        Board_initGeneral();
        retParams = SensorI2C_open();
        retParams = SensorMpu9250_init();
        SensorMpu9250_enable(0x0F); //Acc+Gyro+Mag+WoM+-2g
        retParams = SensorMpu9250_accRead((uint16_t *)sensorData);

    It stuck at SensorMpu9250_init() but when I debug it and went inside files to file to find out where it is causing the problem. I have found it hangs at 

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    /* Acquire the lock for this particular I2C handle */
      Semaphore_pend(Semaphore_handle(&(object->mutex)), BIOS_WAIT_FOREVER);

    What could be wrong in initialization? 

  • 0 in reply to J Lindh
    Genius 3345 points

    I tried to add

    CPUdelay(8000*100);

    But did not work.

  • 0 in reply to LAXMI KANT TIWARI
    Prodigy 50 points
    I would like to know what the situation of the matter is now.