nRF9160 DK stopped responding to AT commands

[stevenminnick]

I have 2 nRF9160 DK's.  I've been using 1 for most of my testing and the second one was still in the box. 

I loaded the secure boot and the AT_CLIENT demo project.  Opened up the nRF Link Monitor tool.  Hit the reset button and Zephyr stuff flies on the screen.  Ends up with:

Secure Boot: prepare to jump to Non-Secure image

***** Booting Zephyr OS v1.13.99-ncs2 *****

The AT host sample started.  err=0

(I added the err=%d) in the printf statement to prove that I was doing stuff. 

The problem is when I send it an AT command, I get: Error: 'AT ' timed out

I reloaded the modem firmware with: nrf9160_mdm_dfu --update 

That worked.  But still did not respond to AT commands, just time out.

Took my other dev kit out of the box.  Moved my sim card to DevKit #2.  Loaded the same code on it.  With this: nrfjprog.exe --program zephyr.hex --sectorerase -r -f nrf91 --verify

Reboot DevKit #2, and get the same Zephyr messages and everything works.  AT commands work.  Connects to the network. 

Hook back up to DevKit #1, AT commands time out. 

Now I did solder on a 1 ohm resistor on R60 to measure current.  And if I program the asset tracker software to it, it connects and works perfectly.  But why does the AT_CLIENT time out now? 

Anyone have any thoughts?  Thanks!

Steve

[Ruth Fuchss]

The Secure Boot sample has been renamed to Secure Partition Manager: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/0.4.0/nrf/samples/nrf9160/spm/README.html

The change is mentioned in the release notes for 0.4.0.

[stevenminnick]

Totally missed that.  Thanks!  I think loading the SecureBoot/SecurePartitionMananger might help Pratik to get his at_client to run and respond.

[buono]

I'm having the exact same issue. I'm trying to follow your suggestions, but I'm a bit confused. Are you saying you need to load 2 hex files? The SPM first and then the AT_client? Is there a special way of doing this?

[stevenminnick]

I believe that, yes you have to load 2 different hex files. 

nrfjprog.exe --program at_client.hex --sectorerase -r -f nrf91 --verify

nrfjprog.exe --program Secure_Partition_Manager.hex --sectorerase -r -f nrf91 --verify

You can also use the programmer too in the nRF Connect GUI that lets you load multiple hex files.  You can have your bootloader loaded and then just run out of the IDE as well.

That all being said, I'm still having trouble with the new 0.4.0 version of the AT client, was going to make a new thread about that. But this is what I did with the 0.3.0 version. 

[buono]

Thanks for the reply! I tried using the nRF Connect GUI first, but it said the HEX files have overlapping data. I tired using the command line with the command you gave above, but  still dont think its working.  When I reset the DK the output in the terminal window is 

***** Booting Zephyr OS v1.14.99-ncs1 *****

The AT host sample started

Shouldn't there be a bunch of other lines related to the SPM first before the AT host starts? (Still getting the AT timeout error if I send one after the output above)