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ASYD/ASYD_Safety/Ada_Microbit/docs/Ada_Drivers_Library-vs-bb_r...

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We understand that there might be some confusion between the two repositories Ada_Drivers_Library and bb-runtimes. Who does what? What should go where? This page will try to provide an answer.

Don't hesitate to ask more questions on this subject or suggest improvements to this page.

Ada_Drivers_Library vs bb-runtimes

The run-times (bb-runtimes repository) provide an implementation of Ada language features as defined by the standard. These features may include interrupt handling, tasking and time services that are usually provided by what is called an RTOS in the C/C++ world.

The run-times will need to control a few peripherals to provide those features (interrupt controller, one timer, some CPU registers), but it won't touch the other peripherals (I2C, SPI, GPIOs, Ethernet, etc.).

Ada_Drivers_Library on the other side is a library for firmware development in Ada. It provides drivers for remaining peripherals on the system as well drivers for external components and also middleware services. Note that Ada_Drivers_Library may rely on Ada run-time features but it does not mean that the run-time has to be from the bb-runtimes repository, there are other implementation possible depending on the architecture.

The limit between the two projects is the Ada language standard.

Even if for most projects Ada_Drivers_Library and bb-runtimes will be used together, in the end the two remain independent. You can use the run-times with your own drivers or bindings to drivers implemented in C. You can also use Ada_Drivers_Library without the bb-runtimes, for instance on a Raspberry Pi running Linux or if you use a third-party RTOS.