Bluetooth Fundamentals course - Lesson 1 -- Flashed Sample Firmware had no LED or Logging Information

[yuz727]

Hello,

I'm working through the fundamental courses and trying to get my nrf54lm20 development board setup. After I have built and flashed the sample firmware to the dev board. There had been no LED lighting up on the board nor any messages logged when listening on the emulated terminal. The emulated terminal had no message showing up. I'm unsure if the board is even starting after flashing the firmware. There were no error messages during the build or flashing process. Both finished normally.

Below is the build configuration used and the flash logging messages. It is building with the default configurations with sysbuild. As a side note, the flashed firmware was working normally with hello world applications.

  

Thank you,

[Samruddhi Jadhav]

Hi,

Just to confirm, are you trying to use the sample (Bluetooth LE LED Button service) given in exercise 1 of lesson 1? Can you please share a screenshot of your terminal log when you try to build and flash and also of your setup? Have you tried a different board target (Boards and Board targets)? I will try to test this on my end too and get back to you soon with an update. 

Best Regards,

Samruddhi

[yuz727]

Hi,

Yes, I'm trying to use the Bluetooth LE LED Button service. The same result happened when I tried later exercise solutions. As for other targets, I only have nrf54lm20 DK. I've tried this on two different board so I don't think its an hardware problem on specific boards.

For your information. When I was testing with other apps the same behaviour started appearing when I added `CONFIG_BT=y` in the prj.conf file. Even if no bluetooth related function was used in the code.

Below is the logs from the build:

Building l1
west build --build-dir <userhome>/bt-fund/l1/build <userhome>/bt-fund/l1 --pristine --board nrf54lm20dk/nrf54lm20a/cpuapp --sysbuild -- -DCONF_FILE="prj.conf"

-- west build: generating a build system
Loading Zephyr module(s) (Zephyr base): sysbuild_default
-- Found Python3: <userhome>/ncs/toolchains/2ac5840438/usr/local/bin/python3.12 (found suitable version "3.12.4", minimum required is "3.10") found components: Interpreter 
-- Cache files will be written to: <userhome>/.cache/zephyr
-- Found west (found suitable version "1.4.0", minimum required is "0.14.0")
-- Board: nrf54lm20dk, qualifiers: nrf54lm20a/cpuapp
Parsing <userhome>/bt-fund/l1/Kconfig.sysbuild
Loaded configuration '<userhome>/bt-fund/l1/build/_sysbuild/empty.conf'
Merged configuration '<userhome>/bt-fund/l1/build/_sysbuild/empty.conf'
Configuration saved to '<userhome>/bt-fund/l1/build/zephyr/.config'
Kconfig header saved to '<userhome>/bt-fund/l1/build/_sysbuild/autoconf.h'
-- 
   ************************
   * Running CMake for l1 *
   ************************
Loading Zephyr default modules (Zephyr base).
-- Application: <userhome>/bt-fund/l1
-- CMake version: 3.21.0
-- Found Python3: <userhome>/ncs/toolchains/2ac5840438/usr/local/bin/python (found suitable version "3.12.4", minimum required is "3.10") found components: Interpreter 
-- Cache files will be written to: <userhome>/.cache/zephyr
-- Zephyr version: 4.2.99 (<userhome>/ncs/v3.2.4/zephyr)
-- Found west (found suitable version "1.4.0", minimum required is "0.14.0")
-- Board: nrf54lm20dk, qualifiers: nrf54lm20a/cpuapp
-- Found host-tools: zephyr 0.17.0 (<userhome>/ncs/toolchains/2ac5840438/opt/zephyr-sdk)
-- Found toolchain: zephyr 0.17.0 (<userhome>/ncs/toolchains/2ac5840438/opt/zephyr-sdk)
-- Found Dtc: <userhome>/ncs/toolchains/2ac5840438/usr/bin/dtc (found suitable version "1.5.0", minimum required is "1.4.6") 
-- Found BOARD.dts: <userhome>/ncs/v3.2.4/zephyr/boards/nordic/nrf54lm20dk/nrf54lm20dk_nrf54lm20a_cpuapp.dts
unit address and first address in 'reg' (0x5004c000) don't match for /soc/peripheral@50000000/vpr@4c000/mailbox@1
-- Generated zephyr.dts: <userhome>/bt-fund/l1/build/l1/zephyr/zephyr.dts
-- Generated pickled edt: <userhome>/bt-fund/l1/build/l1/zephyr/edt.pickle
-- Generated devicetree_generated.h: <userhome>/bt-fund/l1/build/l1/zephyr/include/generated/zephyr/devicetree_generated.h
Parsing <userhome>/bt-fund/l1/Kconfig
Loaded configuration '<userhome>/ncs/v3.2.4/zephyr/boards/nordic/nrf54lm20dk/nrf54lm20dk_nrf54lm20a_cpuapp_defconfig'
Merged configuration '<userhome>/bt-fund/l1/prj.conf'
Merged configuration '<userhome>/bt-fund/l1/build/l1/zephyr/.config.sysbuild'
Configuration saved to '<userhome>/bt-fund/l1/build/l1/zephyr/.config'
Kconfig header saved to '<userhome>/bt-fund/l1/build/l1/zephyr/include/generated/zephyr/autoconf.h'
-- Found GnuLd: <userhome>/ncs/toolchains/2ac5840438/opt/zephyr-sdk/arm-zephyr-eabi/arm-zephyr-eabi/bin/ld.bfd (found version "2.38") 
-- The C compiler identification is GNU 12.2.0
-- The CXX compiler identification is GNU 12.2.0
-- The ASM compiler identification is GNU
-- Found assembler: <userhome>/ncs/toolchains/2ac5840438/opt/zephyr-sdk/arm-zephyr-eabi/bin/arm-zephyr-eabi-gcc
-- Using ccache: <userhome>/ncs/toolchains/2ac5840438/usr/bin/ccache
-- Found gen_kobject_list: <userhome>/ncs/v3.2.4/zephyr/scripts/build/gen_kobject_list.py
CMake Warning at <userhome>/ncs/v3.2.4/zephyr/CMakeLists.txt:2321 (message):
  __ASSERT() statements are globally ENABLED
  
-- Configuring done
-- Generating done
-- Build files have been written to: <userhome>/grad_proj/bluetooth/bt-fund/l1/build/l1
-- Configuring done
-- Generating done
-- Build files have been written to: <userhome>/grad_proj/bluetooth/bt-fund/l1/build
-- west build: building application
[7/335] Generating include/generated/zephyr/version.h
-- Zephyr version: 4.2.99 (<userhome>/ncs/v3.2.4/zephyr), build: ncs-v3.2.4
[335/335] Linking C executable zephyr/zephyr.elf
Memory region         Used Size  Region Size  %age Used
           FLASH:      195840 B      2028 KB      9.43%
             RAM:       31304 B       511 KB      5.98%
        IDT_LIST:          0 GB        32 KB      0.00%
Generating files from <userhome>/bt-fund/l1/build/l1/zephyr/zephyr.elf for board: nrf54lm20dk
[10/10] Generating ../merged.hex

Flashing build to nRF54LM20 DK
west flash -d <userhome>/grad_proj/bluetooth/bt-fund/l1/build --dev-id 1051898111

-- west flash: rebuilding
[0/5] Performing build step for 'l1'
ninja: no work to do.
[2/5] No install step for 'l1'
[3/5] Completed 'l1'
[4/5] cd <userhome>/bt-fund/l1/build/_sysbuild && <userhome>/ncs/toolchains/2ac5840438/usr/local/bin/cmake -E true
-- west flash: using runner nrfutil
-- runners.nrfutil: reset after flashing requested
-- runners.nrfutil: Flashing file: <userhome>/bt-fund/l1/build/merged.hex
-- runners.nrfutil: Connecting to probe
-- runners.nrfutil: Programming image
-- runners.nrfutil: Verifying image
-- runners.nrfutil: Reset
-- runners.nrfutil: Board(s) with serial number(s) 1051898111 flashed successfully.

Thank you

[Samruddhi Jadhav]

Hi,

Can you please check the board configurator just in case something has been set there and let me know? The issue could also be that the power to LED is being cut.  

Best Regards,

Samruddhi

[yuz727]

The board configurator shows the LED is on. After flashing the terminal outputs no logging message, this includes both the logging messages in the sample application and the two lines that outputs the version of the sdk and Zephyr. So I'm not sure the board even boot successfully after flashing.

Thanks,

[Samruddhi Jadhav]

Hi,

What revision number is being used? Could you please try the following: Flash Blinky sample (so that we can check if the LEDs & GPIO are working properly and the board is correctly programmed), use the board configurator to modify VDD (set low at 1.7) and then reset. See if the LEDs work by doing this. 

Best Regards,

Samruddhi