# Hello World Example

## Overview

`Hello_world` is the demo program used to show case basic functionality of the system.
The test itself does 2 main things:
* Echo pin changes over UART.
* Echo SPI input over UART.

## GPIO Changes Over UART
This function primarily exercises the GPIO and UART blocks.
The test monitors changing values on the GPIO line and reports them over UART.

## SPI Echo Over UART
All data input over SPI is echo'd on UART in a word aligned fashion.