nrf5340dk netcore console COM ttyACM debug/log output

[ho-gyun choi]

Hello Nordic Dev Zone,

I have been developing on the nrf5340pdk and recently switched to the nrf5340dk.

I utilized the COM console output for app/net cores via the `minicom -d /dev/ttyACM1` and `minicom -d /dev/ttyACM2`. The pdk required that P0.25 and P0.26 are connected to Rx and Tx via physical wire.

I am under the impression from the documents, that the nrf5340dk doesnt not require the extra wiring. Unfortunately, I am not able to get any console output from the netcore via /dev/ttyACM0 or ACM1 for the nrf5340dk.

The netcore seems to be running the firmware code, since the appcore is receiving IPM RPM messages from the netcore.

```

CONFIG_LOG=y
# CONFIG_USE_SEGGER_RTT=y
# CONFIG_RTT_CONSOLE=y
CONFIG_UART_CONSOLE=y

```

I've tried disabling the Mass Storage via JLinkExe but there is still no console output for net core. The appcore console oeutput seems to be working OK.

https://docs.zephyrproject.org/latest/guides/tools/nordic_segger.html

Thank you for your support

[Carl Richard]

Hi, On3!

Thanks for reaching out. Could you check if anything is printed from the third nRF5340 VCOM? I guess it will be ttyACM3 in this case. Also, make sure that the log level is configured so that something actually is printed. CONFIG_LOG_DEFAULT_LEVEL=4 ensures that most logs are taken into account.

Best regards,
Carl Richard

[ho-gyun choi]

Hello Carl,

Thank you for your quick reply.

I've applied the `kconfig` parameter the `CONFIG_LOG_DEFAULT_LEVEL=4` to the `nrf5340dk` and am still not able to get any output for the `netcore` via `COM`.

There seems to be no `/dev/ttyACM3` when the `nrf5340dk` is connected to `debian buster linux pc` via `usb`.

```

[email protected]:~/Dev.local
$ minicom -D /dev/ttyACM
ttyACM0  ttyACM1  ttyACM2

```

[Carl Richard]

Hi again!

That was unfortunate. However, I see that I miswrote earlier. Have you tried to read from ttyACM2 (not ACM3)? 

I will check if we have any known issues regarding this. You have version 0.11.0 of the nRF5340DK?

Best regards,
Carl Richard

[ho-gyun choi]

Carl,

Yes, the sticker on the board includes the id's `PCA10095` `0.11.0` `2020.45`

In regards to `ACM2`, `minicom -d /dev/ttyACM2` seems to be the `appcore` console.

[Carl Richard]

Understood. And there is no output from neither ttyACM0 or ttyACM1?

Which application are you running?

Best regards,
Carl Richard

[wangrj]

hi carl richard

can you help me?

my net core only output the boot information and i enable config_log that uart console will put some strange info

CONFIG_LOG_DEFAULT_LEVEL=3

appcore output to ttyACM1 and netcore is ttyACM0

another question : appcore uart console will make wrong while i use mcumgr command