By Elliot Williams
Atmel's AVR microcontrollers are the chips that energy Arduino, and are the go-to chip for lots of hobbyist and hacking initiatives. during this booklet you'll put aside the layers of abstraction supplied by way of the Arduino surroundings and find out how to software AVR microcontrollers without delay. In doing so, you'll catch up with to the chip and you'll have the ability to squeeze extra energy and lines out of it.
Each bankruptcy of this ebook is established round initiatives that include that specific microcontroller subject. every one undertaking comprises schematics, code, and illustrations of a operating undertaking.
Program a number AVR chips
Extend and re-use different people's code and circuits
Interface with USB, I2C, and SPI peripheral devices
Learn to entry the whole diversity of strength and pace of the microcontroller
Build tasks together with Cylon Eyes, a Square-Wave Organ, an AM Radio, a Passive Light-Sensor Alarm, Temperature Logger, and more
Understand what's occurring backstage even if utilizing the Arduino IDE
Read or Download Make: AVR Programming: Learning to Write Software for Hardware PDF
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Additional resources for Make: AVR Programming: Learning to Write Software for Hardware
Example text
There are tons of flash programmers available, and I’ve listed some of my favorites in “Flash Programmers I Have Known and Loved” on page 29. A lot of you will have an Arduino sitting around. If so, it turns out to be fantastically easy to turn that Arduino (temporarily) into an AVR programmer. I’ll walk you through the steps to do so, and how to wire it up, in “AVR and the Arduino” on page 21. So if you don’t have a dedicated hardware SPI programmer just yet, I’ll get you up and running with an Arduino.
2. Turn your source code into machine code with a compiler (and associated software tools). 3. Using uploader software on your big computer and a hardware flash programmer, send the machine code to your target AVR chip, which stores the instructions in its nonvolatile flash memory. 4. As soon as the flash programmer is done, the AVR chip resets and starts running your code. Figure 2-1 sketches out the main steps in AVR firmware development along with which tools you’ll use for each step. The first step in your toolchain is going to be a text editor, or whatever you’re most comfortable writing code in.
This will make sense once you’re used to the Studio environment. Similarly, if you use someone else’s software, you’ll need to add a symbol for every macro variable defined in their project’s makefile. Support for non-Atmel hardware programmers has also been variable, and the utility that’s included in Studio isn’t nearly as flexible as the open-source AVRDUDE program that I recommend. ) To use AVRDUDE with Studio, you can create an “External Tool” command that calls AVRDUDE with the correct options for your programmer and chip.