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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