Writing fuses

Other Hardware 3rd Party Boards
1

Hi
I`m stuck here with understanding how to change fuses on my ATMEGA328P-PU chip. It has a bootloader on board already.

So, what I need is to make chip to run on him self(without external crystal or resonator), i.e. with internal RC oscillator.
As far as I know from internet to make this happen I should make my arduino ISP-programmer, change file boards.txt and then burn the bootloader. I am right? When I trying this I get error message like this:

***failed;  
avrdude: verification error, first mismatch at byte 0x0000
         0xff != 0x07
avrdude: verification error; content mismatch

What I am doing wrong?

And yes, Ive read [good Gammons article](Gammon Forum : Electronics : Microprocessors : How to make an Arduino-compatible minimal board), but those fuses I don`t need.

2

Freeborn_rus:
So, what I need is to make chip to run on him self(without external crystal or resonator), i.e. with internal RC oscillator.
As far as I know from internet to make this happen I should make my arduino ISP-programmer, change file boards.txt and then burn the bootloader. I am right?

Yes.

Freeborn_rus:
When I trying this I get error message like this:

***failed; 

avrdude: verification error, first mismatch at byte 0x0000
         0xff != 0x07
avrdude: verification error; content mismatch




What I am doing wrong?

If it's set up to need a clock then you have to provide one while you do "burn bootloader".

You can remove the clock when it's running on internal oscillator.

3

fungus:
If it's set up to need a clock then you have to provide one while you do "burn bootloader".

You can remove the clock when it's running on internal oscillator.

Thanks for the answer, but when I connect ATMEGA328P-PU with crystal oscillator(as it showed on the last picture of tutorial) I also get the same error.

4

Try this fuses (internal 8mhz):

LF:0xE2
HF: 0xD9
EF: 0xFF

Which IDE version are you using, 1.0.5?

5

mart256:
Which IDE version are you using, 1.0.5?

Yes, 1.0.5.

Your fuses gave the same error.

6

Once I got that error but the clock was set properly and it did work ok, so I didn't pay attention to the verification.