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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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/*
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;
}
};
}