matter example light_bulb is not working with nrf52840dk

[kaattueli]

Hi,

I tried to run the "matter"  light_bulb example from nrfconnect versions 2.0.0, 1.9.1  2.0.99, but failed to 

to see blinking LEDs.  I suspect this may have something to do with the programming.  I programmed  ( nrf52840-dk) by

copying the hex file to  the JLINK usb disk that appears  after power on.   This method works with blink example

but not with the light_bulb.  I also experimented by creating a new project  with all the configurations of light_bulb

but  main.c copied form blink. This experiment  also fails to blink.  What could be the problem?    Regards, Solai

[Vidar Berg]

Hi,

Did you make sure to program the 4532.merged.hex file? Unlike zephyr.hex, merged.hex also includes the bootloader that is needed to boot the app.

Best regards,

Vidar

[kaattueli]

Hi Vidar,

Thanks for your message.  I copied the generated  "merged.hex" file  to the JLINK disk, but that did not work.

1. When I compile with this command

west build -b nrf52840dk_nrf52840 -- -DCONF_FILE=prj.conf

a "merged.hex" is created, not with a name that starts with "4532".

2. I programmed with the file in your message, that also does not blink any LED

nor it responds to button keypress.

Solai

[Vidar Berg]

Hi Solai,

Strange, I'm not able to reproduce this here either. Please try to run this line to both build and flash the FW:

'west build -b nrf52840dk_nrf52840 -- -DCONF_FILE=prj.conf && west flash --erase' and see if it makes any difference.

[kaattueli]

Hi Vidar, 

This command works.   I have to spend days  to get started, following

incomplete advice to program the device. 

On further experiment, I found out that  copying the  file to the JLINK disk drive did not work even for blink example when MCUBoot is enabled.  

Thanks very much for the help.  Regards Solai