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85 lines
2 KiB
Markdown
85 lines
2 KiB
Markdown
# Introduction
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---
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## A Layered Approach
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When building Embedded Systems in Rust, we use Rust crates to help us build a modular system.
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The elements are:
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* The program you are writing
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* The MCU are running on
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* The PCB (or Board) your MCU is on
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* The external devices connected to your MCU
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---
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## The Layers
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To support these elements, we (usually) have these layers.
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* Application
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* Board Support
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* External Drivers (e.g. SPI LCD Driver)
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* Hardware Abstraction Layer Traits
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* MCU Hardware Abstraction Layer Implementation
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* MCU Peripheral Access Crate
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* Core Peripherals
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* Core Runtime
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---
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```mermaid
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graph TB
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app(Application<br/><tt>my_application</tt>)
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bsc[Board Support<br/><tt>nrf52840_dk</tt>]
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hal[MCU HAL Implementation<br/><tt>nrf52480_hal</tt>]
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lcd_driver[SPI LCD Driver<br/><tt>ssd1306</tt>]
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hal_traits[[HAL Traits<br/><tt>embedded_hal</tt>]]
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pac[MCU PAC<br/><tt>nrf52840</tt>]
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rt[Core Runtime<br/><tt>cortex_m_rt</tt>]
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cp[Core Peripherals<br/><tt>cortex_m</tt>]
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subgraph Key
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note1[Embedded Working Group]
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note2[nrf-rs]
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note3[You]
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note4[Others]
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end
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direction TB
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app --> bsc
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app & bsc --> hal
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app --> lcd_driver
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app & lcd_driver --> hal_traits
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hal -- Implements --o hal_traits
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app & hal --> pac
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app & pac --> rt
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app & pac & rt --> cp
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class app binary;
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class bsc library;
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class lcd_driver library;
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class hal mcu_library;
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class pac mcu_library;
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class hal_traits ewg_library;
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class rt ewg_library;
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class cp ewg_library;
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class note1 ewg_library;
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class note2 mcu_library;
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class note3 binary;
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class note4 library;
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classDef binary fill:#fb8,stroke:#333,stroke-width:4px;
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classDef library fill:#cf9,stroke:#333,stroke-width:2px;
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classDef ewg_library fill:#f9c,stroke:#333,stroke-width:2px;
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classDef mcu_library fill:#9cf,stroke:#333,stroke-width:2px;
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```
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---
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## Don't worry!
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There's a lot here. We're going to take it step by step, starting at the bottom.
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