/espnut

An ESP32 port of Eric Smith's Nonpareil emulator. Designed for HP Voyager calculator emulation.

Primary LanguageC++GNU General Public License v2.0GPL-2.0


An ESP32 port of Eric Smith's Nonpareil emulator. Designed for HP Voyager calculator emulation.
The successor of shezik/esp15c (now archived).
To perform a firmware update, visit espnut-updater.

Features

  • Matrix keyboard driver for ESP32-S3 that doesn't support dedicated GPIO interrupt :)
  • Power management
  • State saving & loading
  • Graphical menu and file manager
  • Synthetic programming support for HP-15C (yx + ON)

Todo (Sorted by priority)

  • Remove excess variables saved in state file
  • deleting empty directories
  • Logging and accessing logfile
  • Read comments marked with '!!'
  • Apply ROM patches dynamically
  • Add ESP32 cpu frequency options to Menu

Schematics are available here.

Porting to unicore chips

This project utilizes the auxiliary core of ESP32-S3 to scan the matrix keyboard. You'll need to take care of the xTaskCreatePinnedToCore function called in src/MatrixKeyboard.cpp, though I suppose that ARDUINO_RUNNING_CORE would also be 0 in this case.

Additionally, check commit 7db65a if watchdog is often triggered. You'll probably want to replace yield() with vTaskDelay().

Also confirm that there's enough RAM that fits the ROM files.