defmt-rtt

Transmit [defmt] log messages over the RTT (Real-Time Transfer) protocol

defmt ("de format", short for "deferred formatting") is a highly efficient logging framework that targets resource-constrained devices, like microcontrollers.

The fastest way to get started with defmt is to use our [app-template] to set up a new Cortex-M embedded project.

For more details about the framework check the book at https://defmt.ferrous-systems.com

Customization

The RTT buffer size (default: 1024) can be configured with the DEFMT_RTT_BUFFER_SIZE environment variable in a tight memory situation. Use a power of 2 for best performance.

Support

defmt-rtt is part of the [Knurling] project, [Ferrous Systems]' effort at improving tooling used to develop for embedded systems.

If you think that our work is useful, consider sponsoring it via [GitHub Sponsors].

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)

• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be licensed as above, without any additional terms or conditions.