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added Schmitt trigger and edge triggers

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Ahmet Inan 2019-02-12 09:40:26 +01:00
commit 1fd1f9e2ec
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8
README.md
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@ -56,6 +56,14 @@ The following [infinite impulse response](https://en.wikipedia.org/wiki/Infinite
[atan](https://en.wikipedia.org/wiki/Inverse_trigonometric_functions) and [atan2](https://en.wikipedia.org/wiki/Atan2).
### [trigger.hh](trigger.hh)
Implemented are the following [trigger functions](https://en.wikipedia.org/wiki/Flip-flop_(electronics)):
* [Schmitt trigger](https://en.wikipedia.org/wiki/Schmitt_trigger)
* [Rising edge trigger](https://en.wikipedia.org/wiki/Signal_edge)
* [Falling edge trigger](https://en.wikipedia.org/wiki/Signal_edge)
### [const.hh](const.hh)
Some constants we need

64
trigger.hh Normal file
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@ -0,0 +1,64 @@
/*
Some trigger functions
Copyright 2019 Ahmet Inan <inan@aicodix.de>
*/
#pragma once
namespace DSP {
template <typename TYPE>
class SchmittTrigger
{
TYPE treshold;
bool previous;
public:
constexpr SchmittTrigger(TYPE treshold, bool previous = false) : treshold(treshold), previous(previous)
{
}
bool operator() (TYPE input)
{
if (previous) {
if (input < -treshold)
previous = false;
} else {
if (input > treshold)
previous = true;
}
return previous;
}
};
class FallingEdgeTrigger
{
bool previous;
public:
constexpr FallingEdgeTrigger(bool previous = false) : previous(previous)
{
}
bool operator() (bool input)
{
bool tmp = previous;
previous = input;
return tmp && !input;
}
};
class RisingEdgeTrigger
{
bool previous;
public:
constexpr RisingEdgeTrigger(bool previous = false) : previous(previous)
{
}
bool operator() (bool input)
{
bool tmp = previous;
previous = input;
return !tmp && input;
}
};
}