I was having a Raspberry Pi Zero sitting on my desk for a long time, searching for something to do with it. I also wanted to to learm STM32, mainly DMA and interrups. As the caculator is powered by an STM32F412, why not put them together ?
The idea was to add an application on the calculator, which will display the output of the Raspberry Pi, and send keystroke from the keyboard to it.
I have already used fbtft on a Raspberry Pi to drive a display over SPI, and the NumWorks has some pads exposing an SPI bus, so this should be easy !
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Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!