83 lines
2.7 KiB
Markdown
83 lines
2.7 KiB
Markdown
---
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title: USB Logging
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---
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import Tabs from '@theme/Tabs';
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import TabItem from '@theme/TabItem';
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## Overview
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If you are developing ZMK on a device that does not have a built in UART for debugging and log/console output,
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Zephyr can be configured to create a USB CDC ACM device and the direct all `printk`, console output, and log
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messages to that device instead.
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:::warning Battery Life Impact
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Enabling logging increases the power usage of your keyboard, and can have a non-trivial impact to your time on battery.
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It is recommended to only enable logging when needed, and not leaving it on by default.
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:::
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## Kconfig
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The `CONFIG_ZMK_USB_LOGGING` KConfig value needs to be set, either by copy and pasting into the `app/prj.conf` file, or by running
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`west build -t menuconfig` and manually enabling the setting in that UI at `ZMK -> Advanced -> USB Logging`.
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:::note
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If you are debugging your own keyboard in your [user config repository](user-setup.md), use
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`config/boards/shields/<your_keyboard>/<your_keyboard>.conf` instead of `app/prj.conf`. In Github
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Actions, you can search the `Kconfig file` build log to verify the options above have been enabled
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for you successfully.
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:::
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```
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# Turn on logging, and set ZMK logging to debug output
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CONFIG_ZMK_USB_LOGGING=y
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```
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## Viewing Logs
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After flashing the updated ZMK image, the board should expose a USB CDC ACM device that you can connect to and view the logs.
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<Tabs
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defaultValue="linux"
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values={[
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{label: 'Linux', value: 'linux'},
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{label: 'Windows', value: 'win'},
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{label: 'MacOS', value: 'macos'}
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]}>
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<TabItem value="linux">
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On Linux, this should be a device like `/dev/ttyACM0` and you can connect with `minicom` or `tio` as usual, e.g.:
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```
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sudo tio /dev/ttyACM0
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```
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</TabItem>
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<TabItem value="win">
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On Windows, you can use [PuTTY](https://www.putty.org/). Once installed, use Device Manager to figure out which COM port your controller is communicating on (listed under 'Ports (COM & LPT)') and specify that as the 'Serial line' in PuTTY.
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If you already have the Ardunio IDE installed you can also use its built-in Serial Monitor.
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</TabItem>
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<TabItem value="macos">
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On macOS, the device name is something like `/dev/tty.usbmodemXXXXX` where `XXXXX` is some numerical ID.
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You can connect to the device with [tio](https://tio.github.io/) (can be installed via [Homebrew](https://formulae.brew.sh/formula/tio)):
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```
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sudo tio /dev/tty.usbmodem14401
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```
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You should see tio printing `Disconnected` or `Connected` when you disconnect or reconnect the USB cable.
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</TabItem>
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</Tabs>
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From there, you should see the various log messages from ZMK and Zephyr, depending on which systems you have set to what log levels.
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