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If you'd like to take a look at the Delta Pico's hardware or software, check out the GitHub repository, where you'll find the Rust codebase and KiCad project.
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This project was a follow-on from my Delta M0 - a compact and much more simple calculator, based on one of STM's Cortex-M0 microcontrollers. I wanted to build the Delta Pico as a calculator more similar to the TI-Nspire or HP Prime.
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The hardware abstraction layer (HAL) and the user software are two separate projects, which means you can run the Delta Pico's software on other hardware by just implementing a HAL for it. This allowed me to create a simulator to run on my computer which used the exact same software, which came in handy for debugging several times!
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After a lot of experimentation, I built rbop, a framework for implementing mathematical editors on any platform. It's completely separate to the Delta Pico's codebase - it'll provide the input and evaluation logic, and you just need to implement however it will draw the expressions on your platform.
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The library ecosystem is also currently far from what you have available when writing C or C++. As a Pico SDK project, the Delta Pico implemented USB mass storage using TinyUSB, so it would show us a storage device when connected to a computer. Unfortunately, I wasn't able to find a suitable Rust replacement for this when migrating the codebase.
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Having already risen to being a ubiquitous choice among makers, the Rust bindings for the platform are very complete too.
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I got into electronics about seven years ago now, starting off with little sensor projects using an Arduino Uno kit, and I've been dabbling in the occasional project ever since. I also picked up PCB design during the first COVID-19 lockdown, and built a simple function generator.
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