Step-by-step algebra calculator for Raspberry PI.
This project is experimental and strictly related to my calculator, designed to run on a Raspberry Pi.
Java 25 is required. The Raspberry Pi hardware build targets the project's Java 25 ARMv6 Buildroot image.
GPIO uses the Java 25 Foreign Function and Memory API to map /dev/gpiomem directly. The GPIO path does not use Pi4J or a project JNI library. The keypad's BCM GPIO lines 13, 16, 19, 20, 21, and 26 must be dedicated to WarpPI. The executable hardware JAR enables native access in its manifest; class-path launches must pass --enable-native-access=ALL-UNNAMED.
Many fundamental features are missing, this project is still in its infancy.
If you really want to build and test it on your computer take account of that.
This preview has been built using TeaVM: a JVM made in javascript. Obviously it runs slower than the original. https://local.cavallium.it/calculator/
https://workspace.circuitmaker.com/Projects/Details/Andrea-Cavalli/Scientific-calculator-Keypad
