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@@ -88,10 +88,13 @@ Source: [drivers/cdcacm_autostart](https://github.com/PX4/PX4-Autopilot/tree/mai
### Description
This module listens on USB and auto-configures the protocol depending on the bytes received.
The supported protocols are: MAVLink, nsh, and ublox serial passthrough. If the parameter SYS_USB_AUTO=2
the module will only try to start mavlink as long as the USB VBUS is detected. Otherwise it will spin
and continue to check for VBUS and start mavlink once it is detected.
Manages the USB CDC/ACM serial device (`/dev/ttyACM0`).
`SYS_USB_AUTO` selects the protocol policy once USB VBUS is detected:
- `0` Disabled: bring up the USB serial device only.
- `1` Auto-detect: wait for host bytes and start MAVLink, nsh, or u-blox passthrough.
- `2` MAVLink (default): start MAVLink immediately so the autopilot transmits first
### Usage {#cdcacm_autostart_usage}