Please check for usbasp firmware update and I was unable to program an ATTiny85 on a breadboard when running at 3.3v (it worked fine at 5V), so I decided to bite the bullet and attempt to update the firmware on the USBASP using one of my. (see images below) The board worked ok, but kept giving errors avrdude: warning: cannot set sck period.And I was unable to program an ATTiny85 on a breadboard when running at 3.3v (it worked fine at 5V), so I decided to bite the bullet and attempt to update the firmware on the USBASP using one of my. (see images below)The board worked ok, but kept giving errors: avrdude: warning: cannot set sck period.Copy the correct firmware to the avrdude directory. ![]() To update the firmware you also need to set jumper J2 on the USBasp to update as explained in the Readme.txt Set both USBasp to 5V on jumper J1 and connect them via a 10 pin cable Finally connect the programmer to the computer USB port Now let's get to avrdude.
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