I2C issue in v2.6.0 SDK

[kuchx]

Hello,

So I had a project for Sparkfun nRF9160 Thing plus on toolchain/SDK v2.5.2. Today I noticed that v2.6.0 is out and decided to upgrade. I used basic cellular udp sample to get the lowest Thing Plus baseline current and noticed something strange. So I needed to put any used peripheral in suspended state. Since there is an onboard accelerometer which needed some additional configuring in .overlay file  naturally in main() I tried to suspend the i2c the device used. When I enabled `CONFIG_I2C=y` in .conf file project built just fine but after programming I checked the current profile which had strange pattern so I enabled serial output and noticed that application constantly resets itself. 
The output it gives:

E: ***** BUS FAULT *****
E: Precise data bus error
E: BFAR Address: 0x0
E: r0/a1: 0x0001b120 r1/a2: 0x00d00000 r2/a3: 0x00000000
E: r3/a4: 0x0000000c r12/ip: 0x00000001 r14/lr: 0x000181b5
E: xpsr: 0x81000000
E: Faulting instruction address (r15/pc): 0x0000bfdc
E: >>> ZEPHYR FATAL ERROR 25: Unknown error on CPU 0
E: Current thread: 0x2000ca18 (unknown)
E: Resetting system

So I just wanted to point out, that there is something broken in v2.6.0. I reverted back to 2.5.2 and everything runs smoothly. 

To replicate this issue:

1) Upgrade toolchain and SDK version to 2.6.0 in VS code;

2) Create a new application based on cellular UDP sample;

3) Enable serial output in `proj.conf` and also arr "CONFIG_I2C=y";

4) After building and programming, you should get the same output

Here is the generated support information:

Fullscreen 2352.support_info.txt Download

For help and support, visit the Nordic DevZone at https://devzone.nordicsemi.com/.

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Hope this helps you to solve the issue! 

Regards,

Andris

[Elfving]

When I enabled `CONFIG_I2C=y` in .conf file project built just fine but after programming I checked the current profile which had strange pattern so I enabled serial output and noticed that application constantly resets itself. 

Does it do so rather immediately as well? I don't think I am seeing this on my side with a 9160DK. Does any of you have a 9160DK that you can test this out on as well?

And if not, could you send me a hex of this built for the 9160DK, that I can test here?

Regards,

Elfving

[kuchx]

I also can confirm, that the same code runs on 9160DK but causes problems on Sparkfun nRF9160 Feather

Elfving said:

Does it do so rather immediately as well?

If you mean when the reset appears, than yes, the program immediately crashes and resets

Andris

[Elfving]

Ah, I see.

Then it is best to notify Circuit dojo about this, and thanks for doing so

Well done guys, hopefully circuit dojo can contact us and we'll find a solution.

Regards,

Elfving

[kuchx]

Oh okay. I guess I'll mark this as an answer although the issue still exist.

Thanks for your input Elfving!