Issue with MPU9250 and nrf52

[vam5104]

Hi,

I have been working on MPU9250 examples given in here.Though the program runs fine in KeilUvision 5, the output in tera term shows only 0,0,0 for Accelerometer values in X,Y and Z. I connected the MPU as specified in the header files. Can anyone help me out?

[kirt]

hi,

i am using same example ,

As given in  how to use section in thelink provide i have unzipped folder in C:\kirti\Nrf52dk\nRF5_SDK_14.2.0_17b948a\examples\nrf5-mpu-examples-master\nrf5-ble-mpu-data-ready-interrupts

code shows 1 error as type #5  when i build it in keil v5 as

1.cannot open source input file app_mpu.h

please help how to resolve

[Bjørn Kvaale]

right click on the folder above Application, press Options for Target '....', go to the C/C++ tab, press on the ... button to the right of include paths, scroll all the way to the bottom & change nrf5-mpu-examples to nrf5-mpu-examples-master. The app_mpu.h file is located inside this nrf5-mpu-examples-master folder. You need to go back 5 folders from the Keil project to reach the nrf5-mpu-examples-master folder, which is why the last line should look like this: ..\..\..\..\..\nrf5-mpu-examples-master

[kirt]

Thanks Bjorn kvaale,with this solution above error rectified.

Now I am getting these errors

I am using TWI in target oprion c/c++

errors are

L6218E :undefined symbol nrf_drv_twi_enable

L6218E :undefined symbol nrf_drv_twi_init

L6218E :undefined symbol nrf_drv_twi_rx

L6218E :undefined symbol nrf_drv_twi_tx

L6218E :undefined symbol nrf_drv_twi_xfer

i have checked that defintion for above functions are defined in Twi driver file ie. nrf_drv_mpu_twi.c as given on link .

still above error exist

how to fix this

help will be appreciated .

[Bjørn Kvaale]

Did you write MPU_USES_TWI in the Define field under Options for Target & the C/C++ tab? Did you set SPI_ENABLED 0 & TWI_ENABLED 1 in the sdk_config.h file? Essentially, did you follow everything under How to use in the github link?

[kirt]

Yes , no errors with this solution. i have done with first 4 steps of link given .Is their changes as given 5th step is 

• Remember to define the correct TWI, SPI, and/or interrupt pins. The SPI and TWI pin defines are located in the nrf_drv_mpu_xxi.c files. The GPIOTE interrupt pin is defined in main.c
•  i' m not getting accel values and not able to see logs on J-link segger/termite.I have connected pin P0.03 for SCL and P0.04 for  SDA as given in nrf_drv_mpu_xxi.c

[Bjørn Kvaale]

It seems like you left the TWI pins in nrf_drv_mpu_twi.c as:

#define MPU_TWI_SCL_PIN 3
#define MPU_TWI_SDA_PIN 4

right? If so, should you not have attached the wires to P0.01 & P0.02, as defined in the pin assignment for nrf52832 QFN48?