I have a problem with changing the fuse bytes of my Pro Trinket using avrdude: I can't manage to rewrite them.
I am using the mini-USB port to power it and to communicate with it, so I use the USBtiny programmer.
When I enter the command avrdude -c usbtiny -p m328p -P COM3 -v to discover the characteristic of the ATMega 328P, it works fine (see screemshot below).
When I try to write the low fuse byte with the command avrdude -cusbtiny -p m328p -P COM3 -U lfuse:w:0x22:m , I am asked : Would you like to be changed back? [y/n]. Then I enter y, and the nothing happen: the red LED of the Pro Trinket stays on, and my avrdude terminal is stucked. I have to enter CTRL + C to stop the command. And then I get an error message (see screenshot below):
When I try to write 0xff on the lfuse (which is its default value), everything works fine:
I tried to write others values, but I got the same error as below (not when I wrote the default value 0xff).
I read the lock byte and it is set to 0x3f, so unprogrammed.
I tried to write on the high fuse and extended fuse, and I got the same error:
- when I write their default value, it works perfectly
- when I try with other values, it doesn't work and I got the same error as in the 2nd screenshot below
I can flash (using the Arduino IDE) the sketchs I want, and it works fine.
I have others Pro Trinket, so I tried with them without more success.
If I have forgot to add some information feel free to ask.
Does anyone have a solution for my problem?
I am apologize in advance for the structure of this post, it is the first time for me that I have to ask a question in here.