microbit: updated readme.md

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# microbit
## Building a project for the micro:bit using Yotta
A collection of the commonly used components of the micro:bit runtime with a
standard configuration, to provide an easy to use interface for programming the micro:bit in C/C++.
Instead of using the online IDE, Yotta can be used to provide an equivalent offline experience. The current compilers that are available are:
## Overview
The micro:bit runtime provides an easy to use environment for programming the BBC micro:bit in the C/C++ language, written by Lancaster University. It contains device drivers for all the hardware capabilities of the micro:bit, and also a suite of runtime mechanisms to make programming the micro:bit easier and more flexible. These range from control of the LED matrix display to peer-to-peer radio communication and secure Bluetooth Low Energy services. The micro:bit runtime is proudly built on the ARM mbed and Nordic nrf51 platforms.
## Getting Started
In addition to supporting development in C/C++, the runtime is also designed specifically to support higher level languages provided by our partners that target the micro:bit. It is currently used as a support library for all the languages on the BBC www.microbit.co.uk website, including Microsoft Block, Microsoft TouchDevelop, Code Kingdoms JavaScript and Micropython languages.
### 1. Install Yotta
The first step is to get Yotta onto your machine, to do this follow the install guide [here](http://docs.yottabuild.org/#installing)
## Links
**Note: if you are on windows, dependencies will be missed as of 8/8/15, please use the helper script located [here](https://github.com/ARMmbed/yotta/blob/master/get_yotta.py).**
[micro:bit runtime docs](http://lancaster-university.github.io/microbit-docs/) | [microbit-dal](https://github.com/lancaster-university/microbit-dal) | [samples](https://github.com/lancaster-university/microbit-samples)
### 2. Fetch the example project
## Build Environments
If your install has gone correctly, and you have all dependencies installed, the next step is to fetch the example project using the runtime from GitHub.
| Build Environment | Documentation |
| ------------- |-------------|
| ARM mbed online | http://lancaster-university.github.io/microbit-docs/online-toolchains/#mbed |
| yotta | http://lancaster-university.github.io/microbit-docs/offline-toolchains/#yotta |
git clone https://github.com/lancaster-university/microbit
## Hello World!
#include "MicroBit.h"
MicroBit uBit;
int main()
uBit.display.scroll("Hello world!");
**Note: To successfully build this project you will need access to the microbit-dal private repository, if you need access please email me at joe@comp.lancs.ac.uk.**
## BBC Community Guidelines
### 3. Try to build
Building rarely works first time due to dependencies currently not being installed by Yotta, so the next step is to **try** to build.
The default yotta target you will receive when you pull the aforementioned repo is bbc-microbit-classic-armcc, you can use the following command to print your current target in Yotta:
yt target
bbc-microbit-classic-armcc 0.0.5
mbed-armcc 0.0.8
If you do not have armcc installed (or don't have a license for Keil), then you will need to use GCC. To swap to the GCC target run:
yt target bbc-microbit-classic-gcc
Then you should **try** to build using the following command:
yt build
To build the final hex files for the micro:bit, you will need to install the srec which can be installed via brew (`brew install srecord`), or you can install it manually from [here](http://srecord.sourceforge.net/).**
### 4. Flash your micro:bit
The final step is to check your hex works.
The yotta build command will place files in `/build/<TARGET_NAME>/source`. The file you will need to flash will be microbit-combined.hex. Simply drag and drop the hex.
The expected result will be that the micro:bit will scroll `BELLO! :)` on its display.
[BBC Community Guidelines](https://www.microbit.co.uk/help#sect_cg)