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FAQ: add patch.crates-io example

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@ -290,3 +290,25 @@ General steps:
5. Copy data to that region before using BDMA.
See link:/examples/stm32h7/src/bin/spi_bdma.rs[this example] for more details.
=== How do I switch to the `main` branch?
Sometimes to test new changes or fixes, you'll want to switch your project to using a version from GitHub.
You can add a section to your `Cargo.toml` file like this, you'll need to patch ALL embassy crates to the same revision:
Using `patch` will replace all direct AND indirect dependencies.
[source,toml]
----
[patch.crates-io]
# make sure to get the latest git rev from github, you can see the latest one here:
# https://github.com/embassy-rs/embassy/commits/main/
embassy-embedded-hal = { git = "https://github.com/embassy-rs/embassy", rev = "4cade64ebd34bf93458f17cfe85c5f710d0ff13c" }
embassy-executor = { git = "https://github.com/embassy-rs/embassy", rev = "4cade64ebd34bf93458f17cfe85c5f710d0ff13c" }
embassy-rp = { git = "https://github.com/embassy-rs/embassy", rev = "4cade64ebd34bf93458f17cfe85c5f710d0ff13c" }
embassy-sync = { git = "https://github.com/embassy-rs/embassy", rev = "4cade64ebd34bf93458f17cfe85c5f710d0ff13c" }
embassy-time = { git = "https://github.com/embassy-rs/embassy", rev = "4cade64ebd34bf93458f17cfe85c5f710d0ff13c" }
embassy-usb = { git = "https://github.com/embassy-rs/embassy", rev = "4cade64ebd34bf93458f17cfe85c5f710d0ff13c" }
embassy-usb-driver = { git = "https://github.com/embassy-rs/embassy", rev = "4cade64ebd34bf93458f17cfe85c5f710d0ff13c" }
----