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Message & Error Explainer

What an ArduPilot message means and what to do about it

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A log download is in progress

Stops itLogging and storage

What ArduPilot says:

The ground station is downloading a log over the telemetry link. While that goes on ArduPilot does not write a new log, so it will not arm. On a board that logs to a flash chip, even listing the logs counts.

What to do, most likely first

  1. The log download window is still open, or a download is running.

    FixLet it finish or cancel it, and close the window.

  2. The ground station was closed or lost the link in the middle of a download.

    FixReboot the flight controller: only the ground station's “end” message, or a reboot, stops the transfer.

Parameters to look at

ParameterWhat it is
LOG_BACKEND_TYPEAP_Logger Backend Storage type
The code that sends it

PreArm: Downloading logs

libraries/AP_Arming/AP_Arming.cpp AP_Arming::logging_checks() · Open in ArduPilot Copter-4.7.1

Written here for Copter 4.6. In the tool you choose your vehicle and version, see your own parameter values beside the ones named here, and drop a flight log to have every message in it explained.

Open it in the Message & Error Explainer