61 lines
1.7 KiB
61 lines
1.7 KiB
#pragma once
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#include "Arduino.h"
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#include "TeensyTimerTool.h"
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class PulseGenerator
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{
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public:
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PulseGenerator(); // constructor, initializes non hardware related stuff
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void begin(unsigned pin); // intializes hardware related stuff
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void schedulePulse(float delay, float width); // schedules a 'width µs' wide pulse after a waiting time of 'delay µs'. Non blocking.
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protected:
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TeensyTimerTool::OneShotTimer pulseTimer; // used for generating the pulses
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void callback();
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uint32_t pin;
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float width;
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};
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void PulseGenerator::begin(unsigned pin)
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{
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this->pin = pin;
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pinMode(pin, OUTPUT);
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digitalWriteFast(pin, LOW);
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pulseTimer.begin([this] { this->callback(); });
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}
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void PulseGenerator::schedulePulse(float delay, float _width)
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{
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width = _width; // the timer callback needs to know the pulse width to generate the pulse
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if (delay != 0)
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{
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pulseTimer.trigger(delay); // this triggers the oneShot timer to fire after 'delay µs'
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}
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else //delay == 0, directly generate the pulse
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{
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digitalWriteFast(pin, HIGH);
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pulseTimer.trigger(width); // this triggers the oneShotTimer to fire after 'width µs'
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}
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}
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void PulseGenerator::callback()
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{
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if (digitalReadFast(pin) == LOW)
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{
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digitalWriteFast(pin, HIGH);
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pulseTimer.trigger(width); // retrigger
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} else
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{
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digitalWriteFast(pin, LOW);
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}
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}
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PulseGenerator::PulseGenerator()
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: pulseTimer(TeensyTimerTool::FTM0) // use one of the 8 FTM0 channels
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{} |