I was working with programming the atmega328p and was programming it using the USBasp I just made. I uploaded two programs with a successful upload, but then I mistakenly changed the lower fuse byte from 0XEF to 0XE1. The value 1 refers to a reserved bit and no clock bit in the datasheet. Now after that, my program stopped working and now I don't know how to set that. I have seen the oscillator method but it didn't work for me. Kindly suggest me some technique that will work 100% to reset my fuses back. Kindly help
What about USBasp? You can run command from CLI. Does not work?
Here is the command, just in case:
avrdude -pATmega328P -PUSB –cUSBasp -Ulfuse:w:0xEF:m
You mean by writing 0xE1, you selected "Reserved" option?
I think you will need a high-voltage programmer to rescue the chip.
I don't know, I've never used one. This ChipMark2 is insanely expensive. It should do the miracles for that price. Maybe you have the user guide. Personally, I would rather buy a new chip.
If ISP programming does not help then parallel programming should, like @amazed suggests.
You wrote you have USBasp. Did you even try it? It would be nice to read some answer at least, if somebody is trying to help. Something like: "I don't care, I want to do this by other way."
Yes, actually I have tried that using an external oscillator at XTAL, and in the first case it worked. I uploaded the blink example but the led was not blinking. Thus I went on changing lock bits. Suddenly my avrdude crashed and my all fuse bits set to one. After that, I tried again and again but didn't work. I used another chip to check if it isn't the issue of the programmer but it wasn't, as the new chip worked well. The oscillator method didn't work this time. Now I want to erase the chip completely to reset. I have to go to some lab for this programmer.
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