The really easy way to flash and dump an ATtiny414 mcu

This approach leverages the Arduino IDE's avrdude instance to permit support for compilation from c source to avr for 1-series ATtiny chips over UPDI (and a few others :) )! We also use this method to quickly program the programmer ;) It is possible to modify your own avrdude configuration here too, but I won't cover that here. Feel free to do this yourself though! :)

STEPS:

1. Install the Arduino IDE from their website.

   • Version 2.3.2 is tested. https://www.arduino.cc/en/software
   • Ubuntu 24.04 has some issues with sandboxing. To get around this, extract the zip, then (sudo chown root:root chrome-sandbox && sudo chmod 4755 chrome-sandbox) inside the folder.

2. Get jtag2updi into our programming boards.

   • git clone https://github.com/SpenceKonde/jtag2updi.git
   • Open up jtag2updi.ino in the arduino IDE. Wait for it to load in other files.
   • Select the correct board and port that the programmer is, and is connected to.
   • The large ones are “Arduino Uno”, the small ones are “Arduino Nano”
   • The board shouldn't have any attached cables at this point. Upload from jtag2upsi.ino as appropriate.
   • Connect the capacitor (the small blue thing) between the RESET and GND pins.

3. Add board support for our one-series chips.

   • Goto File->Preferences. Walled garden enthusiasts might have this under Arduino->Preferences.
   • Navigate to "Additional boards manager URLs", and paste the entire following link:
   • https://raw.githubusercontent.com/rdttl/Scones-Demo/main/pkgrdttl.json
   • Then, goto Tools->Board->Boards manager. Search for 'megaTinyCore', and install it
   • Restart the IDE

4. Select the correct board.

   • Goto Tools->Board->megaTinyCore, and select ATtiny3224/.../414
   • Goto Tools->Chip, and select ATtiny414
   • Goto Tools->Programmer, and select “jtag2updi”
   • Ensure that the correct port or file (such as dev/ttyXXX) is selected. You might have to plug the board in for this step :))

IMPORTANT: DO NOT power the board externally when dumping/flashing firmware as below! The programmer board should provide sufficient power.

5. We can also leverage the now super supportive avrdude program to dump an existing flash on the board.

   • Ensure the programmer<->target pins are connected as:
     • 5V <-> VCC
     • GND <-> GND
     • PWM pin 6 <-> UPDI
   • We need to identify where your avrdude installation file is, we can test this by turning on verbose output in File->Preferences and attempting an upload. Alternatively, just search the system for the file names as normal.
   • After this, we are essentially copying the command out again, adjusting r/w flags as appropriate.
     • This should yield something similar to:
     • "$avrdude_location/avrdude" -C "$avrdude_conf" -v -V -pattiny414 -cjtag2updi -P/dev/ttyACM0 -b115200 "-Uflash:r:dump.hex:i"
   • It shouldn't need to be said, but connect your programmer to the computer too ;)

6. We can also now write to the board!! The sky is the limit!! Well, actually the low specs of the board is, but you get the idea.

   • Ensure the programmer<->target pins are connected as:
     • 5V <-> VCC
     • GND <-> GND
     • PWM pin 6 <-> UPDI
   • We can now compile our program and flash our chip with the generated hex file. (Sketch->Upload using Programmer) (or avrdude)