Issue with MPU9250 and nrf52

RE: Issue with MPU9250 and nrf52

Fili — Thu, 07 Jun 2018 21:34:22 GMT

Hi, I am using that example to test it with the MPU6050, I did exactly what I have to just as the README file indicates. I tried to get the accel data through the nRF Toolbox app UART and I did get any data. Either In which app am I suppose to get data or where can I get it?

Thanks in advance

P.D. I am working with the SDK 14.2 and S132 V5.0.0

RE: Issue with MPU9250 and nrf52

kirt — Tue, 13 Mar 2018 13:14:24 GMT

Now I can see logs on RTT

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

RE: Issue with MPU9250 and nrf52

Bjørn Kvaale — Tue, 13 Mar 2018 13:08:30 GMT

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?

RE: Issue with MPU9250 and nrf52

kirt — Mon, 12 Mar 2018 15:20:24 GMT

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

RE: Issue with MPU9250 and nrf52

Bjørn Kvaale — Mon, 12 Mar 2018 15:02:01 GMT

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.

RE: Issue with MPU9250 and nrf52

kirt — Mon, 12 Mar 2018 07:59:41 GMT

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?

RE: Issue with MPU9250 and nrf52

kirt — Fri, 09 Mar 2018 11:57:55 GMT

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

RE: Issue with MPU9250 and nrf52

Bjørn Kvaale — Fri, 09 Mar 2018 10:14:33 GMT

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?

RE: Issue with MPU9250 and nrf52

kirt — Thu, 08 Mar 2018 13:17:34 GMT

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

RE: Issue with MPU9250 and nrf52

Bjørn Kvaale — Thu, 08 Mar 2018 12:46:54 GMT

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?

RE: Issue with MPU9250 and nrf52

kirt — Wed, 07 Mar 2018 09:07:16 GMT

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 .

RE: Issue with MPU9250 and nrf52

Bjørn Kvaale — Wed, 07 Mar 2018 08:23:53 GMT

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

RE: Issue with MPU9250 and nrf52

kirt — Mon, 05 Mar 2018 13:59:04 GMT

hi,

i am using same example ,Code got build in kkeil fine ,But i am not getting accel values .

what steps did you take to get values.

please help how to resolve.

RE: Issue with MPU9250 and nrf52

kirt — Mon, 05 Mar 2018 06:20:56 GMT

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

RE: Issue with MPU9250 and nrf52

vam5104 — Thu, 21 Dec 2017 11:17:39 GMT

The issue was with my mpu9250. I have used twi sensor example and was able to get the output without any issues.

RE: Issue with MPU9250 and nrf52

Bjørn Kvaale — Tue, 19 Dec 2017 14:13:22 GMT

Could you please explain in more detail the steps you took to get the output? This could be very helpful for other people that run into the same problem in the future. Thanks!

RE: Issue with MPU9250 and nrf52

vam5104 — Tue, 19 Dec 2017 14:02:26 GMT

I got the output but im facing another issue. posted here

RE: Issue with MPU9250 and nrf52

Bjørn Kvaale — Mon, 04 Dec 2017 14:16:46 GMT

This devzone case could be helpful. Also, this case might be helpful. It seems you need to establish a ble connection with your phone for example before any data will be visible in the terminal. Just to make sure, you are using SDK 11, right? Have you taken a look at the "How To Use" section in the Github link you posted in your question? Hope that helps!

RE: Issue with MPU9250 and nrf52

vam5104 — Wed, 29 Nov 2017 17:36:47 GMT

Also, when I'm trying to print the raw data values of acc_values.x, acc_values.y and acc_values.z, there is no output in tera term. This might be because of nRF not able to access the raw data values.

RE: Issue with MPU9250 and nrf52

vam5104 — Wed, 29 Nov 2017 15:46:44 GMT

I'm using nrf5-ble-uart-mpu-data-ready-interrupts example.

RE: Issue with MPU9250 and nrf52

Bjørn Kvaale — Wed, 29 Nov 2017 14:55:24 GMT

Which mpu example are you using? The nrf5-ble-mpu-simple example?