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33 lines
848 B
C
33 lines
848 B
C
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#pragma once
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#include <Arduino.h>
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/**
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* Periodically invoke a callback.
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*
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* FIXME: currently just syntatic sugar for polling in loop (you must call .loop), but eventually
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* generalize with the freertos scheduler so we can save lots of power by having everything either in
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* something like this or triggered off of an irq.
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*/
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class Periodic
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{
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uint32_t lastMsec = 0;
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uint32_t period = 1; // call soon after creation
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uint32_t (*callback)();
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public:
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// callback returns the period for the next callback invocation (or 0 if we should no longer be called)
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Periodic(uint32_t (*_callback)()) : callback(_callback) {}
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// for the time being this must be called from loop
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void loop()
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{
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uint32_t now = millis();
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if (period && (now - lastMsec) >= period)
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{
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lastMsec = now;
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period = (*callback)();
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}
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}
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};
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