Blue HAL

Embedded Hardware Abstraction Layer developed at Bluefruit Software. Implementations are mostly only coupled to ARM Cortex-M.

blue_hal contains most drivers used in the Loadstone secure bootloader project.

Connection to the Rust embedded ecosystem

blue_hal started primarily as an in-house learning project, so there's some amount of duplication between the drivers contained in this repository and some of the preexisting embedded-hal implementations, specially around the early stm32 drivers.

The drivers in blue_hal don't directly implement the embedded-hal interfaces. Instead, blue_hal offers its own set of abstractions which made sense during the development of Loadstone. The plan is to support embedded-hal directly in the future.

Structure

• src/hal contains all abstract interfaces.
• src/hal/doubles is a test only module that contains test doubles (fakes, mocks, etc) for most drivers.
• src/drivers contains concrete driver implementations. These are nested by specificity, with the MCU family or chip vendor always referenced in the module structure.
• src/utilities contains general purpose code applicable to multiple drivers.