Chris Giacofei
8b72a16203
All the input/output tracking is handled with class members instead of passing pointers to global variables.
42 lines
953 B
C++
42 lines
953 B
C++
#ifndef SLOWPWM_h
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#define SLOWPWM_h
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#include <Arduino.h>
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class slowPWM {
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private:
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byte outputPin;
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unsigned long period;
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unsigned long lastSwitchTime;
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byte outputState;
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public:
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void begin(byte pin, unsigned long per) {
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outputPin = pin;
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period = per;
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lastSwitchTime = 0;
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outputState = LOW;
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pinMode(pin, OUTPUT);
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}
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byte compute(uint8_t duty) {
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unsigned long onTime = (duty * period) / 1000;
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unsigned long offTime = period - onTime;
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unsigned long currentTime = millis();
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if (duty == 0) {
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outputState = LOW;
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} else if (outputState == HIGH && (currentTime - lastSwitchTime >= onTime)) {
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lastSwitchTime = currentTime;
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outputState = LOW;
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} else if (outputState == LOW && (currentTime - lastSwitchTime >= offTime)) {
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lastSwitchTime = currentTime;
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outputState = HIGH;
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}
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return outputState;
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}
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};
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#endif
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