The firmware can be uploaded to AVR JTAG ICE usb stick with no dismantling or soldering just by a simple upload tool.
Currently AVR JTAG ICE can be bought from various sources, one of them: Aliexpress
+----------+ +---------------------+ +--------------------+
| PC | | AVR JTAG ICE VTref +(4)--------->--------------+ Vcc |
| avrdude | | | +----------+ | |
| | | nSRST +(6)---+ 4k7 +---------+ UPDI |
| USB +----------+ USB | +----------+ | |
| | | | | Target |
| | | | | |
| | | | | |
| | | GND +(2)-+ +--+ GND |
+----------+ +---------------------+ | | +--------------------+
JTAGICE MkII +-+ UPDI +-+
Protocol GND Protocol GND
Just remember VTref will supply the target MCU chip with 5V from the AVR JTAG ICE ! For using with different own MCU board potential (e.g. 3.3V or 1.8V) leave VTref unconnected. Also you can step down the voltage using a regulator (e.g. 3.3V) from VTref if target mcu supports lower voltage only.
Uncomment lines below to enable AVR JTAG ICE support and then run makefile to compile the firmware.
...
rem
rem select AVRJTAGICE v2.0 as target (override upper)
rem
set TARGETMCU=atmega16
set DEFINES=-DNDEBUG -DUPDI_BAUD=120000U -DF_CPU=7372800 ...
...
...
##
## select AVRJTAGICE v2.0 as target (override upper)
##
TARGETMCU=atmega16
DEFINES="-DNDEBUG -DUPDI_BAUD=120000U -DF_CPU=7372800 ...
...
To burn the USB module, use avr-aosp.py uploader tool (as superuser) plug in USB module and while the LED blinks fast red-blue (5 seconds window at statup) run these steps:
1) Erase content of module:
python3 avr-aosp.py -op erase
INFO
S = AVRBOOT #programmer id
V = 10 #software version
v = ? #hardware version
p = S #programmer type
a = Y #autoincrement support
b = ? #block mode support
t = [7400] #supported device code
s = 02941e #signature
N = ? #high fuse bits
F = ? #low fuse bits
r = ? #lock bits
Q = ? #extended fuse bits
ERASE program memory
2) Upload the firmware:
python3 avr-aosp.py -op write -file ../../build/JTAG2UPDI.hex
INFO
S = AVRBOOT #programmer id
V = 10 #software version
v = ? #hardware version
p = S #programmer type
a = Y #autoincrement support
b = ? #block mode support
t = [7400] #supported device code
s = 02941e #signature
N = ? #high fuse bits
F = ? #low fuse bits
r = ? #lock bits
Q = ? #extended fuse bits
WRITE program memory [../../build/JTAG2UPDI.hex] #2378 bytes
0...10...20...30...40...50...60...70...80...90...100 - done.
3) Unplug and then replug the USB stick, red-blue blinking stops with permanent red LED turned on.
4) With red LED turned on firmware is active and can be used with avrdude, see provided wiring to target MCU.