nRF9160DK read/write string to Flash in mqtt_simple

RE: nRF9160DK read/write string to Flash in mqtt_simple

cachro2 — Wed, 25 Nov 2020 19:21:12 GMT

That recovered the DK!

So I reloaded modem and application firmware after the recover and everything worked... could not repeat the rebooting failure. I assume I messed up something on the DK while I was testing which lead to the problems.

Here is the mqtt_simple project for those interested. It reads/writes the string "Hello\n" to flash and is able to send AT commands to the modem.

devzone.nordicsemi.com/.../mqtt_5F00_simple_5F00_flash_5F00_at_5F00_commands.zip

LTE Link Monitor output:

2020-11-25T19:19:19.460Z DEBUG modem << SPM: NS image at 0x1c200
2020-11-25T19:19:19.461Z DEBUG modem << SPM: NS MSP at 0x20024e00
2020-11-25T19:19:19.462Z DEBUG modem << SPM: NS reset vector at 0x1f919
2020-11-25T19:19:19.468Z DEBUG modem << SPM: prepare to jump to Non-Secure image.
2020-11-25T19:19:19.662Z DEBUG modem << *** Booting Zephyr OS build v2.4.0-ncs1  ***
2020-11-25T19:19:19.678Z DEBUG modem << The MQTT simple sample started
2020-11-25T19:19:19.697Z DEBUG modem << 1
2020-11-25T19:19:19.699Z DEBUG modem << 2
2020-11-25T19:19:19.701Z DEBUG modem << Hello
2020-11-25T19:19:19.703Z DEBUG modem << LTE Link Connecting ...
2020-11-25T19:19:21.220Z DEBUG modem << +CEREG: 2,"CB64","031B9801",7,0,0,"11100000","11100000"
2020-11-25T19:19:21.274Z DEBUG modem << +CSCON: 1
2020-11-25T19:19:24.578Z DEBUG modem << +CEREG: 5,"CB64","031B9801",7,,,"11100000","11100000"
2020-11-25T19:19:24.604Z DEBUG modem >> AT+COPS=3,2
2020-11-25T19:19:24.607Z DEBUG modem << LTE Link Connected!

There was a minor bug in the original post which I updated.

Thanks for your support Hakon and apologies for the confusion.

RE: nRF9160DK read/write string to Flash in mqtt_simple

Hakon — Wed, 25 Nov 2020 15:01:50 GMT

[quote user="cachro2"]Unfortunately, I bricked my DK trying to run variants of this firmware so I cannot get you more logs.[/quote]

Have you tried 'nrfjprog --recover' on the bricked DK?

RE: nRF9160DK read/write string to Flash in mqtt_simple

cachro2 — Wed, 25 Nov 2020 14:56:36 GMT

Unfortunately, I bricked my DK trying to run variants of this firmware so I cannot get you more logs. However, the firmware never reached the printk statements which would have indicated that it wrote to and read from the flash sectors correctly.

RE: nRF9160DK read/write string to Flash in mqtt_simple

Hakon — Wed, 25 Nov 2020 14:51:05 GMT

[quote user="cachro2"]I'm not sure if I understand your question.[/quote]

It looks like you didn't properly copy/paste the output log, because all I see is

2020-11-17T15:04:06.608Z DEBUG modem << Non-secure callable region 0 placed in flash region 2 with size 32.

and no error.

RE: nRF9160DK read/write string to Flash in mqtt_simple

cachro2 — Fri, 20 Nov 2020 15:01:55 GMT

I'm not sure if I understand your question. The read/write to firmware above should read/write to flash on the nrf9160 (as indicated by other forum posts) but instead it causes a hard fault; causing my DK to reboot once per second. It is an error because the inclusion of the above firmware in mqtt_simple projects directly causes the cyclic reboot.

Maybe to simplify the ask, can you please help me understand why:

DT_FLASH_AREA_STORAGE_OFFSET and DT_FLASH_DEV_NAME are seemingly undeclared.

RE: nRF9160DK read/write string to Flash in mqtt_simple

Hakon — Fri, 20 Nov 2020 14:43:14 GMT

Hello,

[quote user=""]It compiles and runs but I get the following error in LTE Link Monitor which causes a cyclic reboot:[/quote]

What makes you think this is an error? This looks completely normal to me, and should not be the cause of the reboot. Can you set CONFIG_DEBUG=y in prj.conf and see if you get any other debug messages in the output log?

RE: nRF9160DK read/write string to Flash in mqtt_simple

cachro2 — Tue, 17 Nov 2020 16:33:06 GMT

Grep'ing through the file system found the following:

C:\ncs\v1.4.0\zephyr\doc\releases\release-notes-2.3.rst:

989: * :github:`24356` - MCUboot (and other users of DT_FLASH_DEV_NAME) broken with current zephyr master

and

devicetree_legacy_unfixed.h

C:\ncs\v1.4.0\nrf\samples\nrf9160\mqtt_simple\build_nrf9160dk_nrf9160ns\zephyr\include\generated\devicetree_legacy_unfixed.h:
 2171  #define DT_FLASH_AREA_STORAGE_ID                    6
 2172  #define DT_FLASH_AREA_STORAGE_READ_ONLY             0
 2173: #define DT_FLASH_AREA_STORAGE_OFFSET_0              1024000
 2174: #define DT_FLASH_AREA_STORAGE_OFFSET                DT_FLASH_AREA_STORAGE_OFFSET_0
 2175  #define DT_FLASH_AREA_STORAGE_SIZE_0                24576
 2176  #define DT_FLASH_AREA_STORAGE_SIZE                  DT_FLASH_AREA_STORAGE_SIZE_0

I am new to zephyr, any thoughts to resolve?