1. AVR-GCC Programming
Using C Development Tools to program your Arduino Microcontrollers.
Presented by: Charles Norona
November 17th, 2011
C. Norona,

2. Intro to WinAVR Set of tools for developing Arduino M/Cs. Includes:
Avr-gcc (command line compiler)
Avr-libc (compiler library)
Avr-as (assembler library)
AVRDude (Programming Interface)
Avarice (JTAG ICE interface)
Avr-gdb (Debugger)
Programmer's Notepad (IDE/Code Editor)
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3. Getting WinAVR
Download the latest version of WinAVR at the download page.
Latest version as of Nov. 15, 2011 is
Run the installer once downloaded.
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4. Setting Up the Dev Environment
Steps involved:
Editing the Makefile.
Explanation of the makefile.
Resources for editing.
Setting up and using an IDE. In this case: Programmer's Notepad.
Adding custom commands
Setting up the project.
Running the program.
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5. Editing the Make File
Explanation of important Makefile instructions. Refer to “Main Tutorial for WinAVR” reference.
References for navigating the Makefile:
AVRDude Options (lists of acceptable parameters and commands usage).
Microcontroller Datasheet (tech specs).
AVRDude.conf (configuration file for AVRDude).
Can generally found at: ../AVRDude- XXXXXXXX/bin/avrdude.conf
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6. Setting Up and Using an IDE
Our IDE needs to be set up with proper build and make commands.
Make All
Make Clean
Program Device
Make Extcoff
Make Coff (deprecated)
COFF – Common Object File Format. However in the context of the AVR it is referred to as the file
format that AVR Studio uses for its debugging. AVR Studio 4.07 and later also supports an extended
COFF format that has a few extra features. The WinAVR package is able to make both types of COFF
files, although you may need to add the COFF extension package on.
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7. Setting Up and Using an IDE
In Programmer's Notepad the tools customization can be accessed by Tools → Options
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8. Setting Up and Using an IDE
Make All Command
Name: Make All
Command: make
Folder: %d
Parameters: all
Save: Current File
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9. Setting Up and Using an IDE
Make All Command
Capture output: enabled and uses main window.
Clear output: optional
Output Parsing: Use built-in error parser.
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10. Setting Up and Using an IDE
Ensure that the rest of the commands are implemented. The following are the corresponding settings for each command:
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11. Running a Program Add this code to the new file, test01.c.
#include <avr/io.h>
#include <avr/delay.h>
void main (void) {
unsigned char counter;
//set PORTB for output
DRB = 0xFF;
while (1)
//set PORTB.2 high
PORTB |= 1<<2;
//wait (10 * ) cycles = wait cycles
counter = 0;
while (counter != 5)
//wait (30000 x 4) cycles = wait cycles
_delay_loop_2(30000);
counter++ }
//set PORTB.2 low
PORTB &= ~(1<<2);
return 1;
Add this code to the new file, test01.c.
Do not forget to edit the Makefile with appropriate values.
Code will have errors for sake of exemplification.
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12. Demo Time!
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13. References
Main page for WinAVR.
Main Tutorial for WinAVR which this presentation is based on. By C. O'Flynn and E. Weddington
AVRDUDE Info.
WinAVR Download link.
Arduino Duemilanove Listing.
WinAVR GCC Tutorials Source. Contains plenty of tutorials to do various things with your arduino.
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