keypad: document avr fuse flashing
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@ -5,3 +5,8 @@
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3) if re-making the hw from scratch, you need to make some HW mods to the keypad:
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- green led moved to a different pin (due to UART conflict)
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4) verify the pin IDs
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Clock external 4 mhz
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Board: ATmega168
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Variant: 168/168A
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avrdude -p atmega168 -c usbasp -v -B 4 -U lfuse:w:0xed:m -U hfuse:w:0xdd:m -U efuse:w:0xf9:m
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