I want to completely block the access to an ATmega328. How do I do this?
I have Atmel ICE, AVR studio 7 and Arduino.
Bootloader - optiboot_atmega328 Fuses(without lock) - 0x05, 0xDE, 0xFF
Steps I am executing:
- Program fresh ATmega328 with bootloader using Atmel Studio.
- Burn the fuses as mentioned above.
- Go to Arduino and program the code.
- Come back to Atmel Studio >> lock bits >> enable no further programming and verification.>> Fuse bits>> disable reset.
Is the above way OK? Or should I add something to the above?
I have programmed the fuse bit with "Further programming and verification disabled". I read out the hex file and it does not match even I programmed the same hex into a different micro and it didn't work. This seems to be fine. But will high Voltage programmer brick this wall?
Note: When I program the above fuse bit. I am unable to disable the RESET or SPI. It says one or more register differ
I want avoid a readback via high voltage programmer too.
I have too many people to steal my code I want to avoid it. Kindly help