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avr_bootloader:bootloader [2020/03/23 17:38] admin [Burning the Bootloader with the AVRdude] |
avr_bootloader:bootloader [2020/03/23 18:53] admin [Burning the Bootloader with the AVRdude] |
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| Go to the folder with the bootloader: | Go to the folder with the bootloader: | ||
| $ cd /usr/share/arduino/hardware/arduino/avr/bootloaders/optiboot/ | $ cd /usr/share/arduino/hardware/arduino/avr/bootloaders/optiboot/ | ||
| + | |||
| + | === Fuse Bits === | ||
| + | In the board.txt file the fuses bits are set like that: | ||
| + | uno.bootloader.low_fuses=0xFF | ||
| + | uno.bootloader.high_fuses=0xDE | ||
| + | uno.bootloader.extended_fuses=0xFD | ||
| + | uno.bootloader.unlock_bits=0x3F | ||
| + | uno.bootloader.lock_bits=0x0F | ||
| + | The extended fuse bits settings for the brown-out detection level (BOD) are: | ||
| + | 0xFF (BOD disabled) | ||
| + | 0xFC (BOD = 4.3V) | ||
| + | 0xFD (BOD = 2.7V) | ||
| + | 0xFE (BOD = 1.8V) | ||
| + | That is the level where the Arduino resets when underpowered.\\ | ||
| + | |||
| + | A good manual for calculating the fuse bits one findes here [[https://www.instructables.com/id/How-to-change-fuse-bits-of-AVR-Atmega328p-8bit-mic/]]. | ||
| === ... with an AVR ISP Programmer ==== | === ... with an AVR ISP Programmer ==== | ||
| Line 92: | Line 108: | ||
| or even: -e -F\\ | or even: -e -F\\ | ||
| Sometimes a specific Baud rate helps, too: -b 19200\\ | Sometimes a specific Baud rate helps, too: -b 19200\\ | ||
| + | For verbose mode output use: -v\\ | ||
| === Burning an Atmega328 (without P) == | === Burning an Atmega328 (without P) == | ||