You can either take a pre-built firmware package from http://www.smarthomatic.org/builds/builds.html or build your own firmware. If you take the prebuilt package, extract it to a directory of your choice.

If you build your binaries by yourself with “make”, your fuse settings should be available as files lfuse.bin, hfuse.bin and efuse.bin in the bin subdirectory of the device you want to flash. You can write these fuses with:

make program_fuses

Be sure about the fuse settings you want to write in your microcontroller. With wrong fuse settings, your microcontroller might not be accessible anymore!

If you are creating a new or modified SHC device, you may want to write other than the default fuses. You can do so with:

avrdude -p ATMEGA328P -U lfuse:w:0x??:m

(replace ?? by the hex value for the needed fuse settings and use “lfuse”, “hfuse” or “efuse” accordingly).

After setting up avrdude, you can flash the firmware by calling the flash scripts

• flash.cmd / flash.sh for flashing firmware, eeprom and fuses
• flash_firmware.cmd / flash_firmware.sh for flashing only the firmware
• : The Linux scripts do not exist yet.

If you have the source code on your machine, you can flash the firmware with the following command from the firmware subdirectory:

make program

If you want to call avrdude by hand you can flash everything with:

avrdude -p m328p -U flash:w:shc_basestation.hex -U eeprom:w:shc_basestation.e2p:r -U lfuse:w:lfuse.bin:r -U hfuse:w:hfuse.bin:r -U efuse:w:efuse.bin:r

(leave one part “-U …” out to flash only a part).

You should only write the fuses once. And in general, it's a good idea to only flash what you need to, because there is a limited amount of possible flash cycles.