At a Glance

Prerequisites

• Same as Module 2

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# Move to the firmware folder (if you weren't already there)
cd ~/shared/firmware
# Checkout the wip_getting_started branch (just in case)
git checkout wip_getting_started
# Check what branch we're on and if we have any changes
# This should say something along the lines of "nothing to commit, working directory clean"
git status

Controlling an LED - HAL

Let's update getting_started for basic General Purpose Input/Output (GPIO) pin control. We'll assume that our LED is an active-low (turns on when output is 0) and connected to PC9 (port C, pin 9).

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Woah, there's a lot going on here! Do you understand how everything works?

Code Breakdown - HAL

First, it really helps to have the firmware folder open in your editor so you can reference our source code.

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Try playing with the code - adjust the timeout, replace wait(), change the LED, add another LED at a different interval, etc.

Cleanup and Commit - HAL

You should know the drill:

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