mirror of
https://github.com/embassy-rs/embassy.git
synced 2024-11-22 14:53:03 +00:00
25 lines
1.3 KiB
Plaintext
25 lines
1.3 KiB
Plaintext
= Embassy STM32 HAL
|
|
|
|
The link:https://github.com/embassy-rs/embassy/tree/main/embassy-stm32[Embassy STM32 HAL] is based on the `stm32-metapac` project.
|
|
|
|
== The infinite variant problem
|
|
|
|
STM32 microcontrollers come in many families, and flavors and supporting all of them is a big undertaking. Embassy has taken advantage of the fact
|
|
that the STM32 peripheral versions are shared across chip families. Instead of re-implementing the SPI
|
|
peripheral for every STM32 chip family, embassy has a single SPI implementation that depends on
|
|
code-generated register types that are identical for STM32 families with the same version of a given peripheral.
|
|
|
|
=== The metapac
|
|
|
|
The `stm32-metapac` module uses pre-generated chip and register definitions for STM32 chip families to generate register types. This is done at compile time based on Cargo feature flags.
|
|
|
|
The chip and register definitions are located in a separate module, `stm32-data`, which is modified whenever a bug is found in the definitions, or when adding support for new chip families.
|
|
|
|
=== The HAL
|
|
|
|
The `embassy-stm32` module contains the HAL implementation for all STM32 families. The implementation uses automatically derived feature flags to support the correct version of a given peripheral for a given chip family.
|
|
|
|
== Timer driver
|
|
|
|
The STM32 timer driver operates at 32768 Hz by default.
|