Arduino firmware for a "Cone to Hank" winding machine

Hardware Description
- MCU: Arduino Leonardo (atmega32u4)
- Display: 1.3" 128x64 I2C SH1106 OLED Display
- Navigation: Joystick module
- Motor controller: L298N
- Turn sensor: Optical detector
- Start/Pause/Stop button with embedded LED

Firmware features
- Navigation menu
  - Joystick control (up/down/left/right/select)
  - Configure number of turns and motor speed
  - Manual motor control
  - Save current settings as default in eeprom
- Start/Stop/Pause button/led
- Control motor (direction and speed/pwm)
- Counts turns based on optical encoder inputs
- Watchdog reset & recovery
- Splash screen & screensaver

... only ~100 bytes left in SRAM between heap/stack ...

Development environment
- Microsoft's Visual Studio Code with PlatformIO IDE extension
- Build targets:
  - leonardo
    Release target (expect simavr in gdb mode [-g] for debug)
  - leonardo-mmcu
    Include the .mmcu section to the ELF output (dropped otherwise) avr_mcu_section.c defines simavr parameters as well as addresses (I/O, SRAM, ...) to include in vcd output. e.g. monitor stack and heap trends (and clashes) over time as 'analog' signals

jpcornil-git / Cone2Hank