If you are looking to lock bits on AVR® devices, specifically boot lock bits, then this tutorial will show you how. It also shows how to secure bootloader Flash memory and secure EEPROM memory using lock bits to prevent access to EEPROM and Flash memory.
This video will also cover how to program and clear fuse bits through Atmel Studio using the user interface and the command line. The video will finish by showing how to “chiperase” to reset the fuse lock bits.
If you are learning how to build a secure microcontroller application that cannot be easily reprogrammed. Check this video out!
Commands used in Atmel Studio Command Prompt
atprogram -d atmega328pb -t edbg -i jtag write -lb --values FC
atprogram -d atmega328pb -t edbg -i jtag read -lb
atprogram -d atmega328pb -t edbg -i jtag chiperase
Documentation references
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Atmel Tools Documentation:
https://mchp.us/2YvUlVb
AVR Libc reference manual:
http://www.microchip.com/webdoc/AVRLibcReferenceManual/group__avr__lock.html
ATmega324PB datasheet: Program and Data Memory Lock bits
http://ww1.microchip.com/downloads/en/DeviceDoc/40001908A.pdf#page=347
ATmega 324PB Xplained Pro User Guide:
http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-42633-ATmega324PB-Xplained-Pro_User-Guide.pdf
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