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C Programming for Arduino

You're reading from  C Programming for Arduino

Product type Book
Published in May 2013
Publisher Packt
ISBN-13 9781849517584
Pages 512 pages
Edition 1st Edition
Languages
Author (1):
Julien Bayle Julien Bayle
Profile icon Julien Bayle

Table of Contents (21) Chapters

C Programming for Arduino
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
Let's Plug Things First Contact with C C Basics – Making You Stronger Improve Programming with Functions, Math, and Timing Sensing with Digital Inputs Sensing the World – Feeling with Analog Inputs Talking over Serial Designing Visual Output Feedback Making Things Move and Creating Sounds Some Advanced Techniques Networking Playing with Max 6 Framework Improving your C Programming and Creating Libraries Index

Memory management


This section is a very short one but not a less important one at all. We have to remember we have the following three pools of memory on Arduino:

  • Flash memory (program space), where the firmware is stored

  • Static Random Access Memory (SRAM), where the sketch creates and manipulates variables at runtime

  • EEPROM is a memory space to store long-term information

Flash and EEPROM, compared to SRAM, are non-volatile, which means the data persists even after the power is turned off. Each different Arduino board has a different amount of memory:

  • ATMega328 (UNO) has:

    • Flash 32k bytes (0.5k bytes used by the bootloader)

    • SRAM 2k bytes

    • EEPROM 1k bytes

  • ATMega2560 (MEGA) has:

    • Flash 256k bytes (8k bytes used by the bootloader)

    • SRAM 8k bytes

    • EEPROM 4k bytes

A classic example is to quote a basic declaration of a string:

char text[] = "I love Arduino because it rocks.";

That takes 32 bytes into SRAM. It doesn't seem a lot but with the UNO, you only have 2048 bytes available. Imagine you use a big lookup...

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