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down-the-stack-book/src/supporting_your_particular_board.md
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# Supporting your particular board
---
## Using a 'normal' PC
* Did you tell your PC it had a mouse plugged in?
* Did you tell it what I/O address the video card was located at?
* No! It auto-discovers all of these things.
* USB, PCI-Express, SATA all have "plug-and-play"
---
## Using an Embedded System
* There is no plug-and-play
* Your MCU can put different functions (UART, SPI, etc) on different pins
* The choice of which function goes on which pin was decided by the PCB designer
* You now have to tell the software how the PCB was laid out
* i.e UART0 TX is on Port 0, Pin 13
---
## Board Support Crates
* You can wrap this up into a Board Support Crate
* Especially useful if you are using a widely available dev-kit
* e.g. the nRF52840-DK, or the STM32 Discovery
* Still useful if the board design is an in-house one-off
* Create the drivers and does the pin assignments for you
* Helps make your application portable across different boards
---
## Using a Board Support Crate
```rust
```
---