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67 lines
1.1 KiB
C++
67 lines
1.1 KiB
C++
/*
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Some trigger functions
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Copyright 2019 Ahmet Inan <inan@aicodix.de>
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*/
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#pragma once
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namespace DSP {
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template <typename TYPE>
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class SchmittTrigger
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{
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TYPE low, high;
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bool previous;
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public:
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constexpr SchmittTrigger(TYPE threshold = TYPE(1)/TYPE(3), bool previous = false) : low(-threshold), high(threshold), previous(previous)
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{
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}
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constexpr SchmittTrigger(TYPE low, TYPE high, bool previous = false) : low(low), high(high), previous(previous)
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{
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}
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bool operator() (TYPE input)
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{
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if (previous) {
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if (input < low)
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previous = false;
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} else {
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if (input > high)
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previous = true;
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}
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return previous;
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}
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};
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class FallingEdgeTrigger
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{
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bool previous;
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public:
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constexpr FallingEdgeTrigger(bool previous = false) : previous(previous)
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{
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}
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bool operator() (bool input)
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{
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bool tmp = previous;
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previous = input;
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return tmp && !input;
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}
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};
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class RisingEdgeTrigger
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{
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bool previous;
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public:
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constexpr RisingEdgeTrigger(bool previous = false) : previous(previous)
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{
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}
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bool operator() (bool input)
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{
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bool tmp = previous;
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previous = input;
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return !tmp && input;
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}
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};
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}
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