Protect Your Firmware on ATmega (Lock Bits Explained)
📥 RESOURCES & DOWNLOADS
• AVR Fuse Calculator: https://eleccelerator.com/fusecalc/fu...
✏️ EXERCISES
• https://drive.google.com/drive/folder...
🧠 QUIZ
• https://forms.gle/voRAcDGrKdzvKZSb8
Learn how to protect your firmware on ATmega microcontroller devices using lock bits and boot lock bits. If you've spent weeks or months developing embedded code, the last thing you want is someone copying or modifying it.
This video explains how flash memory protection works, including the roles of SPM (Store Program Memory) and LPM (Load Program Memory), and how access can be restricted between the Application Section and Boot Flash Section.
We break down:
The different protection modes of Boot Lock Bits (BLB0 & BLB1)
How Lock Bits (LB) prevent external reading and writing via programmers
Why does enabling protection disable debugging interfaces like debugWIRE and JTAG
How chip erase resets lock bits (and what it doesn’t reset)
How to preserve EEPROM using the EESAVE fuse
Practical tips using avrdude for locking/unlocking devices
By the end, you'll understand how to balance firmware security with flexibility for updates and debugging.
#Arduino #ATmega #LockBits #FlashProtection #BootLockBits #IPProtection #ChipErase #Firmware #Security #BOOTSZ #SPM #LPM #EmbeddedSecurity
📖 CHAPTERS
0:00 Introduction
2:09 Protecting Application and Bootloader Flash Sections
9:08 The Lock Fuse
13:54 Using avrdude to lock down your Program