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add speed optimization

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JuliDi 2023-12-04 20:59:08 +01:00
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docs/modules/ROOT/pages/faq.adoc
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@ -135,3 +135,19 @@ embassy-time = { git = "https://github.com/embassy-rs/embassy.git", rev = "e5fdd
----
Note that the git revision should match any other embassy patches or git dependencies that you are using!
== How can I optimize the speed of my embassy-stm32 program?
* Make sure RCC is set up to go as fast as possible
* Make sure link:https://docs.rs/cortex-m/latest/cortex_m/peripheral/struct.SCB.html[flash cache] is enabled
* build with `--release`
* Set the following keys for the release profile in your `Cargo.toml``:
** `opt-level=s`
** `lto=fat`
** `build-std=core`
** `build-std-features=panic_immediate_abort`
* Enable feature `embassy-time/generic-queue`, disable feature `embassy-executor/integrated-timers`
* When using `InterruptExecutor`:
** disable `executor-thread`
** make `main`` spawn everything, then enable link:https://docs.rs/cortex-m/latest/cortex_m/peripheral/struct.SCB.html#method.set_sleeponexit[SCB.SLEEPONEXIT] and `loop { cortex_m::asm::wfi() }`
** *Note:* If you need 2 priority levels, using 2 interrupt executors is better than 1 thread executor + 1 interrupt executor.