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]

Yes,i have connected wires to P0.01 (SCL) and P0.02 (SDA) of nrf52 DK now.i am not able to see accel values and i dont see MPU BLE  device in nrf connect app. 

In main.c

 #define DEVICE_NAME                     "MPU BLE" 

i added some log in main as SEGGER_RTT_printf(0,"entering main") .It didnt get displayed on j-link RTT viewer.

please help with 

[kirt]

hi,as i m trying to print when execution starts i.e int main(void) as shown in recent reply

but nothing get displayed on J-Link RTT .does it mean that code is not working/am  i missing something?

[Bjørn Kvaale]

Did you add the SEGGER_RTT_printf(0,"Entered in main..") function call? What if you use the NRF_LOG_INFO() function instead, since that has been defined in multiple places? I am unsure whether it works to use both SEGGER_RTT_printf() & NRF_LOG_INFO() in the same program. Not sure it is advisable to do this.

[kirt]

Now i can see nrf logs

i need to use j-link RTT viewer because values displayed in NRF_LOG_INFO are not recognisable as shown in attached file what changes do i need to make in code to get print SEGGER_RTT_printf(0,"Entered in main..") .I have added

#include "SEGGER_RTT.h"
#include "SEGGER_RTT_Conf.h"

in main.c file

[Bjørn Kvaale]

That's good that you can see nrf logs with j-link rtt viewer. That is what I use too. If you can now see the NRF_LOG_INFO prints on j-link rtt viewer, why can you not use NRF_LOG_INFO("Entering main") instead of SEGGER_RTT_printf()? I don't understand why you want to use both NRF_LOG_INFO & SEGGER_RTT_printf()? Is it because you want to use termite instead of rtt viewer?

[kirt]

Now I can see logs on RTT 

Because in nrf_log some logs get display as some characters which can't be understood