How to output HEX file for AVR programming?

[slow_hand]

Hey all,

I'm kind of new at AVRs and C but I know Java pretty well. Many of my friends use CB and I thought to try it as well and I like it much better than PN2.
I wrote a simple 'Hello World' kind of program that I want to burn on an ATMEGA168 AVR.

Here is the code:

#define F_CPU 1000000UL

#include <inttypes.h>
#include <avr/io.h>
#include <util/delay.h>

void _delay_ms(); // Function deceleration

int main(void)
{
   DDRB = 0b11111111; // Set PORTB pins as output
   PORTB = 0b00000000; // Set output on all pins to logic 0

   while(1)
   {
       PORTB=00000000; // LED OFF - at bit 0
       _delay_ms(500); // Wait 0.5 sec
       PORTB=00000001; // LED ON - at bit 0
       _delay_ms(500); //Wait 0.5 sec
   }
   return 0;
}


I've noticed a few "strange things".

1. On every tutorial I saw no one defined function prototypes before main, but I'll get all kind of errors if I won't do that. Do I really have to do that?

2. On the tutorials I saw the function was called delay_ms and not _delay_ms, however the one without the underscore won't work.

3. I have WinAVR installed so I changed the default compiler to GNU AVR GCC and set the path to WinAVR folder. After I build the file I will get an EXE file but not a HEX file like I need to burn to the MC. How can I solve this?

Thanks!

[mariocup]

3. I have WinAVR installed so I changed the default compiler to GNU AVR GCC and set the path to WinAVR folder. After I build the file I will get an EXE file but not a HEX file like I need to burn to the MC. How can I solve this?

You can generate a hex file in a post build step with CB like

Code Select Expand


cmd /c <architecture>-objcopy -O ihex Input.elf Output.hex


[slow_hand]

Thank you for the reply, however, can you be a little more specific as I could not understand what to do exactly. Another thing, I don't have an .elf file after buidling... I get main.o & main.exe files.

[mariocup]

Hi,

put the command of avr objcopy in the bost-puilt step like

Code Select Expand


cmd /c avr-objcopy -O ihex <executable> <converted_hex_file>


Replace the <executable> by name of your executable or use instead a CB variable like $(TARGET_OUTPUT_FILE). Then specify the name for the resulting hex file.

If the programmer is a command line tool you could even do the flash programming in a post build step too.

[slow_hand]

Oh OK I understand! I actually got my code working!
Where is the post-build step located? I can't find it in the compiler settings or anywhere else...

[Jenna]

Oh OK I understand! I actually got my code working!
Where is the post-build step located? I can't find it in the compiler settings or anywhere else...

Right click your project in the management pane, chose build options, and you will find a tab called "Pre/Post build steps".

[slow_hand]

Got it! Thank you very much for the quick help. Now that everything works I can finally go to sleep (it's 2:41AM)