Difference between revisions of "Arduino: How to modify fuses"
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Following command set Low/High/Extended fuse and lock configuration (default configuration for Arduino UNO board): | Following command set Low/High/Extended fuse and lock configuration (default configuration for Arduino UNO board): | ||
<pre> | <pre> | ||
| − | avrdude -p m328p -c dragon_isp -P usb - | + | avrdude -p m328p -c dragon_isp -P usb -u -U lfuse:w:0xff:m -U hfuse:w:0xde:m -U efuse:w:0x05:m -U lock:w:0x3f:m |
</pre> | </pre> | ||
| − | ''Note: fuses are stored in eeprom memory. Due to HW restriction clearing memory set each cell to 0xFF. Therefore "unprogrammed" fuse have value of " | + | ''Note: fuses are stored in eeprom memory. Due to HW restriction clearing memory set each cell to 0xFF. Therefore "unprogrammed" fuse have value of "1".'' |
| − | === Default fuses (Arduino UNO) | + | |
| + | === Default fuses (Arduino UNO) === | ||
<pre> | <pre> | ||
lfuse: 0xff | lfuse: 0xff | ||
hfuse: 0xde | hfuse: 0xde | ||
efuse: 0x05 | efuse: 0x05 | ||
| − | lock: | + | lock: 0x3f |
</pre> | </pre> | ||
Latest revision as of 19:25, 2 August 2015
Read fuses from Atmel mcpu
Following command read Low/High/Extended fuse configuration from mcpu + lock configuration:
avrdude -p m328p -c dragon_isp -P usb -U lfuse:r:-:h -U hfuse:r:-:h -U efuse:r:-:h -U lock:r:-:h
"Program" fuses
Following command set Low/High/Extended fuse and lock configuration (default configuration for Arduino UNO board):
avrdude -p m328p -c dragon_isp -P usb -u -U lfuse:w:0xff:m -U hfuse:w:0xde:m -U efuse:w:0x05:m -U lock:w:0x3f:m
Note: fuses are stored in eeprom memory. Due to HW restriction clearing memory set each cell to 0xFF. Therefore "unprogrammed" fuse have value of "1".
Default fuses (Arduino UNO)
lfuse: 0xff hfuse: 0xde efuse: 0x05 lock: 0x3f
