mirror of https://github.com/rusefi/rusefi-1.git
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
/**
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* @file debounce.cpp
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* @brief Generic button debounce class
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*
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* @date Aug 31, 2020
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* @author David Holdeman, (c) 2020
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*/
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#include "debounce.h"
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void ButtonDebounce::init (int t, brain_pin_e p, pin_input_mode_e m) {
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threshold = MS2NT(t);
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timeLast = 0;
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pin = p;
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#ifdef PAL_MODE_INPUT_PULLDOWN
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// getInputMode converts from pin_input_mode_e to iomode_t
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mode = getInputMode(m);
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efiSetPadMode("Button", p, mode);
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#endif
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}
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/**
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@returns true if the button is pressed, and will not return true again within the set timeout
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*/
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bool ButtonDebounce::readPinEvent() {
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if (!pin) {
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return false;
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}
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efitick_t timeNow = getTimeNowNt();
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// If it's been less than the threshold since we were last called
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if ((timeNow - timeLast) < threshold) {
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return false;
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}
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// readValue is a class variable, so it needs to be reset.
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// We don't actually need it to be a class variable in this method,
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// but when a method is implemented to actually get the pin's state,
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// for example to implement long button presses, it will be needed.
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readValue = false;
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#ifdef PAL_MODE_INPUT_PULLDOWN
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readValue = efiReadPin(pin);
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// Invert
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if (mode != PAL_MODE_INPUT_PULLDOWN) {
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readValue = !readValue;
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}
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#endif
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if (readValue) {
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timeLast = timeNow;
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}
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return readValue;
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}
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