nRF7002 example code WiFi Scan failing with error: wifi_nrf_disp_scan_zep: rpu_ctx_zep

[Dushan_zvertech]

I have just received a new nRF7002 and am trying to make it work on v2.2.0 sdk

I add existing application, point it to the nrf/examples/wifi/shell and configure it the build for nRF7002dk_nrf5340_cpuapp. After building and flashing the device I get the following when trying to do the wifi scan

wifi scan<CR><LF>
<ESC>[1;33mScan request failed<CR><LF>
<ESC>[m<ESC>[1;32muart:~$ <ESC>[m<ESC>[8D<ESC>[J[00:00:39.723,815] <ESC>[1;31m<err> wifi_nrf: wifi_nrf_disp_scan_zep: rpu_ctx_zep is NULL<LF><ESC>[0m<CR><LF>
<ESC>[1;32muart:~$ <ESC>[m<ESC>[8D<ESC>[J<ESC>[1;32muart:~$ <ESC>[m

During the build I am getting this message. I don't know if this is normal

-- Found assembler: D:/ncs/toolchains/v2.2.0/opt/zephyr-sdk/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc.exe
CMake Warning at D:/ncs/v2.2.0/zephyr/CMakeLists.txt:824 (message):
No SOURCES given to Zephyr library: drivers__wifi

Excluding target from build.

CMake Warning at D:/ncs/v2.2.0/zephyr/CMakeLists.txt:824 (message):
No SOURCES given to Zephyr library: drivers__ethernet

Excluding target from build.

-- Configuring done
-- Generating done
-- Build files have been written to: D:/ncs/v2.2.0/nrf/samples/wifi/shell/build
-- west build: building application

Also there is the following problem reported after compilation

[{
"resource": "/d:/ncs/v2.2.0/nrf/samples/wifi/shell/prj.conf",
"owner": "kconfig0",
"severity": 4,
"message": "CONFIG_NEWLIB_LIBC_NANO was assigned the value n, but got the value n. Missing dependencies:\nNET_L2_OPENTHREAD || (NEWLIB_LIBC && HAS_NEWLIB_LIBC_NANO) || (HAS_NEWLIB_LIBC_NANO && NEWLIB_LIBC)",
"startLineNumber": 15,
"startColumn": 1,
"endLineNumber": 15,
"endColumn": 24
}]

I have tried what is suggested on  nrf7002 provisioning sample - wifi_nrf_disp_scan_zep: rpu_ctx_zep is NULL but neither adding the rev A on Kconfig nor adding 

CONFIG_NRF700X_REV_A=y into the prj.conf helped, even with doing pristine build and doing the mass erase before flashing. 

Any inputs on how can I get my nRF7002 to so anything on the network? I am new to this so I might be making some basic mistake

Thanks

 

[Dushan_zvertech]

Update: nRF connect SDK v2.2.99-dev3 also deosn't work. The error is the same as on v2.3.0

wifi scan<CR><LF>
<ESC>[1;33mScan request failed<CR><LF>
<ESC>[m<ESC>[1;32muart:~$ <ESC>[m<ESC>[8D<ESC>[J[00:00:12.203,125] <ESC>[1;31m<err> wifi_nrf: wifi_nrf_disp_scan_zep: Interface not UP<LF><ESC>[0m<CR><LF>
<ESC>[1;32muart:~$ <ESC>[m<ESC>[8D<ESC>[J<ESC>[1;32muart:~$ <ESC>[m

I have tried both with and without 

CONFIG_NRF700X_REV_A=y

It doesn't work either way

[dejans]

I could not reproduce the issue you reported. I have successfully built wi-fi shell sample. I used nRF7002-DK (v0.7.2) and NCS v2.2.0.

Could you try flashing the attached zephyr1.hex file that I obtained after building the sample? What is the result?

Have you made any changes to the wi-fi shell sample?

Best regards,
Dejan

[Dushan_zvertech]

Hi,

Thanks for the fast response. I have opened the nrf connect programmer, dragged in the hex file and did erase and flash. After opening the com port I am getting the same error as I do when I compile the shell example on 2.2.0

wifi scan<CR><LF>
wifi scan<CR><LF>
<ESC>[1;33mScan request failed<CR><LF>
<ESC>[m<ESC>[1;32muart:~$ <ESC>[m<ESC>[8D<ESC>[J[00:00:26.031,372] <ESC>[1;31m<err> wifi_nrf: wifi_nrf_disp_scan_zep: rpu_ctx_zep is NULL<LF><ESC>[0m<CR><LF>
<ESC>[1;32muart:~$ <ESC>[m<ESC>[8D<ESC>[J<ESC>[1;32muart:~$ <ESC>[m

[Dushan_zvertech]

Good old scope to the rescue

The power supply wasn't stable but it wasn't bad enough for it to brownout or reset.

The issue came down to a bad USB cable

Now both your build and mine work

Thanks for your help