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Posted by @consolenaut
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Thought I'd give the Espruino Jobs board a go to see if someone can give me a hand with a project I'm working on :)
I'm looking for a dev to write some code to scan a 4x16 matrix of keys using the Espruino MDBT42Q and an MCP23017 port expander chip.
The code should be split into a hardware handling module (communication with the MCP chip/driving the matrix/detecting state changes), and a metadata module (keeping track of if keys were pressed or released & how long they were pressed for, determining if they key was 'tapped' or 'held') which fires events.
The hardware handling module should:
The metadata module should:
Primer on keyboard matrix scanning: https://summivox.wordpress.com/2016/06/03/keyboard-matrix-scanning-and-debouncing/
Espruino NRF52 Programmable Peripheral Interconnect library: https://www.espruino.com/NRF52LL
Espruino MCP23017 library: https://www.espruino.com/MCP23xxx
Untested MCP23017 library with interrupt handling: http://forum.espruino.com/comments/14047043/