rtic/book/en/src/migration_v1_v2.md

Migrating from v1.0.x to v2.0.0

Migrating a project from RTIC v1.0.x to v2.0.0 involves the following steps:

1. v2.0.0 requires #![type_alias_impl_trait] and Rust Nightly.
2. Migrating from the monotonics included in v1.0.x to rtic-time and rtic-monotonics, replacing spawn_after, spawn_at.
3. Software tasks are now required to be async, and using them correctly.
4. Understanding and using data types provided by rtic-sync.

For a detailed description of the changes, refer to the subchapters.

If you wish to see a code example of changes required, you can check out the full example migration page.

TL;DR (Too Long; Didn't Read)

1. Add #![type_alias_impl_trait] to your crate, and use cargo +nightly.
2. Instead of spawn_after and spawn_at, you now use the async functions delay, delay_until (and related) with impls provided by rtic-monotonics.
3. Software tasks must be async fns now. Not returning from a task is allowed so long as there is an await in the task. You can still lock shared resources.
4. Use rtic_sync::arbiter::Arbiter to await access to a shared resource, and rtic_sync::channel::Channel to communicate between tasks instead of spawn-ing new ones.