Xytronic LF-1600 Open Source Firmware

Copyright (c) 2015-2017 Michael Buesch m@bues.ch

Licensed under the terms of the GNU General Public License version 2 or (at your option) any later version.

Selecting the correct firmware hex image:

The hex subdirectory of this package contains various pre-built configurations of the firmware.

• There are hex images available for legacy (through-hole) boards and newer SMD boards.

• Images for controller types AtMega-88 (the original controller) or AtMega-328p (upgrade controller) are available.

• Images with or without debug support (debug vs. release) are available.

If you don't know which one pick, take either hex/board_legacy/atmega88/release or hex/board_smd/atmega88/release depending on your board type.

Installing the firmware:

1. Set the fuse bits of the AtMega88 to:

   LFUSE = 0xE2

   HFUSE = 0xDD

   EFUSE = 0x01

   Set the fuse bits of the AtMega328p to:

   LFUSE = 0xE2

   HFUSE = 0xD9

   EFUSE = 0x05

   Note that the original firmware uses different fuses. So this step must not be omitted.

   If you use avrdude, a command similar to the following can be used:

   avrdude -B 200 -p m88 -c avrisp2 -P usb -U lfuse:w:0xE2:m -U hfuse:w:0xDD:m -U efuse:w:0x01:m

   or

   avrdude -B 200 -p m328p -c avrisp2 -P usb -U lfuse:w:0xE2:m -U hfuse:w:0xD9:m -U efuse:w:0x05:m

2. Flash the firmware image file xytronic-lf.hex to the program memory of the AtMega88.

   If you use avrdude, a command similar to the following can be used:

   avrdude -B 1 -p m88 -c avrisp2 -P usb -U flash:w:xytronic-lf.hex

   or

   avrdude -B 1 -p m328p -c avrisp2 -P usb -U flash:w:xytronic-lf.hex

3. Write the EEPROM image file xytronic-lf.eep.hex to the EEPROM memory of the AtMega88.

   If you use avrdude, a command similar to the following can be used:

   avrdude -B 1 -p m88 -c avrisp2 -P usb -U eeprom:w:xytronic-lf.eep.hex

   or

   avrdude -B 1 -p m328p -c avrisp2 -P usb -U eeprom:w:xytronic-lf.eep.hex