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nrf52 with MPU9255

kirt

Hi ,I am using nrf52 DK with mpu9255.I am using source code given here here.of this link,I have taken  'nrf5-ble-data-ready-interrupts' example .code  builts fine in keil v5 though.I am not getting accel values.

help will be appreciated.

  • 0 in reply to kirt

    i am using same code for board .I have changed SCL and SDA as follows

    In main.c

    #define MPU_MPU_INT_PIN     12  //as INT pin10  for given kit .Physical number 12

    in nrf_drv_mpu_twi.c

    #define MPU_TWI_SCL_PIN 9        
    #define MPU_TWI_SDA_PIN 8     

    because Pin  p0.06 i.e physical number 8 and  P0.07 i.e physical pin number 9

    I am not  getting values for accel and magneto  .please suggest which about pin number/code change

    Here i am using nRF52 DK as a debugger/programmer.another h/w is my application h/w

  • 0 in reply to kirt

    If you want SDA on P0.06 and SCL on P0.07 you should set: 

    #define MPU_TWI_SCL_PIN 7

    #define MPU_TWI_SDA_PIN 6

  • 0 in reply to MartinBL

    Yes .I have set and i have changed INT pin as well ,Because pin 0.08 is is connected to INT pin of mpu9250

    #define MPU_MPU_INT_PIN 8 

     in pca10040.h file these 3 pins are used for

    #define RX_PIN_NUMBER 8
    #define TX_PIN_NUMBER  6
    #define CTS_PIN_NUMBER  7

  • 0 in reply to kirt

    If you look on the back side of your kit you can see which pins are already being used for things like UART. In the MPU examples the UART are configured before the MPU in the code. If you "override" the UART configuration and use the UART pins for the MPU then naturally you will not see anything printed to your terminal. This is why I chose to use pin 3,4,28,29 and 30 by default in the examples since they are not being used by anything else. 

  • 0 in reply to MartinBL

    yes.

    1.In the code sample rate set  is 5Hz, If i require to change it to suppose 25Hz ,Do i need to make here 39 instead of 199 ?

    p_mpu_config.smplrt_div = 199;   // Change sampelrate. Sample Rate = Gyroscope Output Rate / (1 + SMPLRT_DIV). 199 gives a sample rate of 5Hz

    2.Data is sent directly when i enable the notification after connection to device .what changes do i need make if i want to send data only after i write a value to characteristic ?

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