book: how to migrate from git defmt to crates.io defmt

book/src/SUMMARY.md

@@ -39,3 +39,4 @@
   - [Deserialization](./deserialization.md)
     - [Log frames](./log-frame.md)
     - [Lookup](./lookup.md)
+- [Migrating from git defmt to stable defmt](./migration.md)

book/src/migration.md

@@ -0,0 +1,76 @@
+# Migrating from git defmt to stable defmt
+
+On 2020-11-11, a stable version of `defmt` became available on crates.io.
+If you are still using the git version you are encouraged to migrate your project to the crates.io version!
+Two things need to be done to use the crates.io version of `defmt`:
+
+1. change `defmt`, `defmt-rtt` and `panic-probe` dependencies from git to version `"0.1.0"` in relevant `Cargo.toml`-s
+2. install version v0.1.4 (or newer) of [`probe-run`]
+
+[`probe-run`]: https://github.com/knurling-rs/probe-run
+
+Here's are the exact steps for migrating an [`app-template`] project.
+
+[`app-template`]: https://github.com/knurling-rs/app-template
+
+1. In your `app-template` project, change the root `Cargo.toml` as shown below:
+
+``` diff
+ [workspace]
+ members = ["testsuite"]
+
+-[dependencies.defmt]
+-git = "https://github.com/knurling-rs/defmt"
+-branch = "main"
+-
+-[dependencies.defmt-rtt]
+-git = "https://github.com/knurling-rs/defmt"
+-branch = "main"
+-
+-[dependencies.panic-probe]
+-git = "https://github.com/knurling-rs/probe-run"
+-branch = "main"
+-
+ [dependencies]
++defmt = "0.1.0"
++defmt-rtt = "0.1.0"
++panic-probe = { version = "0.1.0", features = ["print-defmt"] }
+ cortex-m = "0.6.4"
+ cortex-m-rt = "0.6.13"
+```
+
+2. In your `app-template` project, also change the `testsuite/Cargo.toml` as shown below:
+
+``` diff
+ name = "test"
+ harness = false
+
+-[dependencies.defmt]
+-git = "https://github.com/knurling-rs/defmt"
+-branch = "main"
+-
+-[dependencies.defmt-rtt]
+-git = "https://github.com/knurling-rs/defmt"
+-branch = "main"
+-
+-[dependencies.panic-probe]
+-git = "https://github.com/knurling-rs/probe-run"
+-branch = "main"
+-# enable the `print-defmt` feature for more complete test output
+-features = ["print-defmt"]
+-
+ [dependencies]
++defmt = "0.1.0"
++defmt-rtt = "0.1.0"
++panic-probe = { version = "0.1.0", features = ["print-defmt"] }
+ cortex-m = "0.6.3"
+ cortex-m-rt = "0.6.12"
+```
+
+3. Finally, install `probe-run` version v0.1.4 (or newer)
+
+``` console
+$ cargo install probe-run -f
+```
+
+Now you can resume working on your project!