Bare Metal Micro

Eclipse for AVR Development

Index

5. Build the Project

Now that we have a project created and configured we are ready to add our source code and build the project.
  1. Select the project in the Project Explorer view.
  2. From the main menu, choose File -> New -> Source File.
  3. Set the Source file to main.c.
  4. Select <None> for the Template.
  5. Press Finish
  6. Add the following code to main.c. We will be using it as a basic "Hello, World!" program. 
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    #include <avr/io.h>
#include <util/delay.h>

int main(void)
{
    // The LED is on Port B, Pin 5
    // Setup LED pin as an output
    DDRB |= _BV(5);

    // Loop forever
    while (1)
    {
        // Turn LED on for 500ms
        PORTB |= _BV(5);
        _delay_ms(500);

        // Turn LED off for 500ms
        PORTB &= _BV(5) ^ 0xFF;
        _delay_ms(500);
    }
}
  7. From the main menu, choose Project -> Build Project.
  8. Eclipse will build your project and when it is done you should see output similar to this in the CDT Build Console view: 
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    12:12:01 **** Rebuild of configuration Debug for project Blink ****
Info: Internal Builder is used for build
avr-gcc -DF_CPU=16000000UL -Os -g3 -Wall -c -fmessage-length=0 -ffunction-sections -fdata-sections -mmcu=atmega328p -o main.o ../main.c 
avr-gcc -mmcu=atmega328p -Xlinker -Map=Blink.map -Xlinker --gc-sections -o Blink main.o 
avr-size Blink 
   text    data     bss     dec     hex filename
    176       0       0     176      b0 Blink
avr-objcopy -O ihex -R .eeprom Blink Blink.hex 

12:12:02 Build Finished (took 355ms)
  9. Before moving on, make sure that there are no errors generated during the build. If you do encounter errors, make sure that the source code is correct, make any necessary changes, and build again.
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