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

[bobdk]

Same problem on the similar circuit dojo nrf9160 feather v4.

[Elfving]

Thanks for reporting guys!

I am looking into it.

Regards,

Elfving

[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

[bobdk]

It works for me on a 9160DK (I used at blinky sample and added CONFIG_I2C=y).  The problem I see is on a circuit dojo nrf9160 feather. I have reported it to Circuit dojo, Jared Wolff as well. Possibly the problem is only when building on the windows environment.  Maybe it has to do with the fact that lis2dh and pcf85063a devices are part of the feather.

[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