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bu5hm4nn/atmega1284p_bootloader.md

Last active November 29, 2025 12:26
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Flash Bootloader to Creality Ender 3 Pro (ATMega1284p, Melzi, Sanguino) using a Raspberry Pi only
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atmega1284p_bootloader.md

My raspberry is running Raspbian

  1. Setup avrdude on Raspberry following this guide: http://archive.today/U0WzQ

    The wiring diagram works exactly the same for the Creality Melzi board

    To run the test, replace atmega328p with atmega1284p

  2. I followed the programming commands from klipper3d.org

    Download the bootloader:

    wget 'https://github.com/Lauszus/Sanguino/raw/master/avr/bootloaders/optiboot/optiboot_atmega1284p.hex'

    flash the bootloader and set the fuses

    avrdude -c linuxgpio -p atmega1284p -e -u -U lock:w:0x3F:m -U efuse:w:0xFD:m -U hfuse:w:0xDE:m -U lfuse:w:0xFF:m
avrdude -c linuxgpio -p atmega1284p -U flash:w:optiboot_atmega1284p.hex
avrdude -c linuxgpio -p atmega1284p -U lock:w:0x0F:m

If this succeeds you can now flash the board over USB using avrdude from your PC (Or using PlatformIO, Arduino IDE, etc)

@PSLLSP
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PSLLSP commented Nov 29, 2025

You can test for success. Connect board to Raspberry with USB cable and try avrdude, it should report this:

$ avrdude -c arduino -p atmega1284p -P /dev/ttyUSB0

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.01s

avrdude: Device signature = 0x1e9705 (probably m1284p)

avrdude: safemode: Fuses OK (E:00, H:00, L:00)

avrdude done.  Thank you.

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