openrcforums

Hi to all,

I wonder why programming the eeprom via USBasp or STK500 takes over 40 seconds with AVRDude?
AVRStudio 4.19 can do the same in less than 4 seconds.

I've tried for hours now to speed up things with AVRDude without succsess

Any help would be appreciated

Sascha

that sounds like something I would do. Spend hours trying to save 40 seconds

just a guess but maybe avrdude is erasing pages at a time where asAVRStudio uses a faster(proprietary) method to update the eeprom.

- Mike. thanks for clarifying this in the next post

I know with usbasp there is a -B option to control the speed of the programming. Then again most (chinese) usbasp do not use the open source usbasp firmware and the speed is automatically controlled by the firmware. With true firmware the default speed is 375khz but there is a max speed of 1.5mhz . In my experience if you set it at 1.5 mhz ( -B .5) the speed gains are reduced by retries. I do not know if the STK500 has a similar interface.

http://9xrprogrammer.com/index.php/lear ... p-firmware

The EEPROM is written 1 byte at a time, and each byte takes around 10mS to write, so a write speed of 100 bytes/second.
It therefore takes 20 seconds to write 2K and 40 seconds to write 4K minimum.
AVRStudio may be skipping writing bytes if there are already correct.

Mike.

I have tried out the -B option, but nothing changes.

But if I think of the behavior of AVRStudi, I think this sounds like the
better way just to write Bytes that are different.

Is it possible to change these behavior in AVRDude.

Or do you wait 40s every time you change your profiles with eePe?

Thanks very very much

Sascha

btw. You are dooing an excelent job. Is it possible to help you in any other way except money?