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add intro text to the beginner workshop
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embedded-workshop-book/src/advanced-workbook.md
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# Advanced Workbook
# `advanced`
In this workshop you'll learn to:
> Advanced workshop
- work with registers and peripherals from Rust
- handle external events in embedded Rust applications
- debug evented applications
- test `no_std` code
In this workshop we'll build a toy USB device application that gets enumerated and configured by the host.
To put these concepts and techniques in practice you'll write a toy USB device application that gets enumerated and configured by the host. This embedded application will run in a fully event driven fashion: only doing work when the host asks for it.
The embedded application will run in a fully event driven fashion: only doing work when the host asks for it.
You have received two development boards for this workshop. We'll only use the nRF52840 Development Kit, the larger of the two, in the advanced workshop.
## The nRF52840 Development Kit
The board has two USB ports: J2 and J3 and an on-board J-Link programmer / debugger -- [there are instructions to identify the ports in a previous section][id-ports]. USB port J2 is the J-Link's USB port. USB port J3 is the nRF52840's USB port. Connect the Development Kit to your computer using both ports.
[id-ports]: ./hardware.md#nrf52840-development-kit-dk
## The nRF52840
Some details about the nRF52840 microcontroller that are relevant to this workshop.
Both development boards have an nRF52840 microcontroller. Here are some details about it that are relevant to this workshop.
- single core ARM Cortex-M4 processor clocked at 64 MHz
- 1 MB of Flash (at address `0x0000_0000`)
- 256 KB of RAM (at address `0x2000_0000`)
- IEEE 802.15.4 and BLE (Bluetooth Low Energy) compatible radio
- USB controller (device function)
## The nRF52840 Development Kit
The development board we'll use has two USB ports: J2 and J3 -- you can find a description of the board in the top-level README of this repository -- and an on-board J-Link programmer / debugger. USB port J2 is the J-Link's USB port. USB port J3 is the nRF52840's USB port. Connect the Development Kit to your computer using both ports.

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embedded-workshop-book/src/beginner-workbook.md
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# Beginner Workbook
In this workshop you'll get familiar with:
- the structure of embedded Rust programs,
- the existing embedded Rust tooling, and
- embedded application development using a Hardware Abstraction Layer (HAL).
To put these concepts in practice you'll write applications that use the radio functionality of the nRF52840 microcontroller.
You have received two development boards for this workshop. We'll use both in the beginner workshop.
## The nRF52840 Development Kit
This is the larger development board.
The board has two USB ports: J2 and J3 and an on-board J-Link programmer / debugger -- [there are instructions to identify the ports in a previous section][id-ports]. USB port J2 is the J-Link's USB port. USB port J3 is the nRF52840's USB port. Connect the Development Kit to your computer using the **J2** port.
[id-ports]: ./hardware.md#nrf52840-development-kit-dk
## The nRF52840 Dongle
This is the smaller development board.
The board has the form factor of a USB stick and can be directly connected to one of the USB ports of your PC / laptop. Do **not** connect it just yet.
## The nRF52840
Both development boards have an nRF52840 microcontroller. Here are some details about it that are relevant to this workshop.
- single core ARM Cortex-M4 processor clocked at 64 MHz
- 1 MB of Flash (at address `0x0000_0000`)
- 256 KB of RAM (at address `0x2000_0000`)
- IEEE 802.15.4 and BLE (Bluetooth Low Energy) compatible radio
- USB controller (device function)