Getting Started with Atmel Studio – Blink

From the Arduino IDE to Atmel Studio

Everything that I needed to do could be done in the Arduino IDESo why would I move to using Atmel Studio?

I recently finished up working through the edX course on Embedded Systems, and it showed me that I had a gap in my knowledge.  I never really worked with registers, and didn’t do direct port manipulation – just because the Arduino IDE made it so easy that I never had to.  The course also opened my eyes to the possibilities of debugging and simulating projects – including JTAG debugging.

So I thought, perhaps not with great maturity, that I need to “nerd up” and get started with a “real” tool.

I was also curious to learn what Atmel Studio offered beyond the Arduino IDE – given that it is developed by Atmel.  Of course the “Hello World” of microcontrollers is the Blink sketch, so that’s where I started.  It wasn’t that tough!

Choose your Programmer

Pocket AVR Programmer (courtesy Sparkfun)

Pocket AVR Programmer (courtesy Sparkfun)

There are a number of programmers/debuggers that Atmel Studio natively supports.  In addition to the official Atmel programmer and debuggers, there are a range sold by third parties.  I won’t turn this post into a review of programmers, but will point you to a low-cost open-source programmer that I was using: the Pocket AVR programmer from Sparkfun (well, it’s actually based on the USBTinyISP, a collaborative effort).  This doesn’t have built-in support in Atmel Studio, but more on that later.

Creating a Project with Atmel Studio

First up, you need to download Atmel Studio.  I’m not going to hold your hand through this, it’s really straightforward.

Atmel Studio is hosted in the Visual Studio environment – some people hate Microsoft, but I cut my teeth on Visual Basic nearly 20 years ago so I was comfortable in the environment.  Sure it may be a bit bulky, but I found the interface easy to work with and I love the autocomplete.

New Project

New Project

Create the project:

  1. Click File, New Project
  2. Choose GCC C Executable Project, and give the project a name and folder location.  Click OK
  3. Select the device that the project will run on.  You can search, or filter by family.  For this case, I chose ATmega328P, and clicked OK

The project will now open with a skeleton code structure in place.

Skeleton Code Structure

Skeleton Code Structure

Before we write the code

Before we get stuck in, a little background work.  Let’s make the LED blink on pin 13 – well, pin 13 if you’re working with an Arduino.  Things in the microcontroller world are a little different.  Take a look at the image below – this shows the mapping between the Arduino pin numbers and the “real” ones:

ATmega to Arduino pin mapping

ATmega to Arduino pin mapping

From this, you can see that pin 13 on the Arduino (in blue) is actually pin 19 on the ATmega328 chip.  If you’re using the T-Board to build this project, then the pins are clearly numbered.  However, to confuse you even further, Atmel Studio doesn’t even use the chip’s pin numbers – it uses ports.

The ATmega328 has 3 ports: PORTB, PORTC and PORTD.  Each port has a number of pins (usually max of 8), labelled numerically.  Eg. PORTB has 8 pins labelled PB0, PB1 … PB7.  Looking at the diagram above, you can see that pin 19 is labelled PB5 – therefore it is on PORTB.

We won’t get into too much theory about port manipulation – there are great tutorials out there – but hopefully this will help you to understand the code a little better.

The Code

Finally!  Type the following into the code window:

#define F_CPU 16000000UL
#include <avr/io.h>
#include <util/delay.h>
int main(void)
{
DDRB |= (1<<DDB5); //Set the 6th bit on PORTB (i.e. PB5) to 1 => output
while(1)
{
    PORTB |= (1<<PORTB5);    //Turn 6th bit on PORTB (i.e. PB5) to 1 => on
    _delay_ms(1000);        //Delay for 1000ms => 1 sec
    PORTB &= ~(1<<PORTB5);    //Turn 6th bit on PORTB (i.e. PB5) to 0 => off
    _delay_ms(1000);        //Delay for 1000ms => 1 sec
}
}

Compile the program

First, set this to a release version – on the toolbar, look for a drop-down box that may say “Debug”, “Release” or “Configuration Manager”.  Select Release

Second, click on Build, Build solution (or press F7)

The program should compile – check for any errors in the message windows at the bottom of the screen.

Program the Microcontroller

If you’re using the Pocket AVR from Sparkfun or the USBTinyISP, then look here for notes on how to get going.

If not, then it’s pretty straightforward:

  1. Connect the ISP programmer to the ICSP header, and plug the USB cable into your PC
  2. Select the ISP Programmer that you will be using, by selecting the Project menu, then …properties
  3. On the Tool tab, select the debugger/programmer you’re using.
  4. Upload the program to the T-Board: Click on Debug menu, then Start without Debugging
  5. The LED should start blinking.

Congratulations! Let me know if you have any questions

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