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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! 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.