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benjaminwand / voctoknopf1

hardware UI for voctomix
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Use interrupt functionality from I/O expander for button pressed events #3

Open nightvisi0n opened 6 years ago

nightvisi0n commented 6 years ago

Currently we poll the I/O expander pins for state changes of the input buttons.
The I/O port expander (MCP23017) can issue interrupts on two pins whenever one of all the input pins changes (see datasheet page 24).
We should catch these interrupts in order to save cpu cycles for other things and in order to guarantee that we don't miss any button press.
However, this means we have to modify the current hardware (connect INTA and/or INTB of each I/O expander to the arduino) and the software.

benjaminwand commented 6 years ago

Ok! What do you want to use the interrupts for? I was considering making ’take’ an interrupt but it seems fast enough.

Am 01.01.2018 um 17:55 schrieb Julian notifications@github.com:

Currently we poll the I/O expander pins for state changes of the input buttons. The I/O port expander (MCP23017) can issue interrupts on two pins whenever one of all the input pins changes (see datasheet page 24). We should catch these interrupts in order to save cpu cycles for other things and in order to guarantee that we don't miss any button press. However, this means we have to modify the current hardware (connect INTA and/or INTB of each I/O expander to the arduino) and the software.

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