100 lines
2.3 KiB
C++
100 lines
2.3 KiB
C++
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#include "RotaryDialer.h"
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#if defined(ARDUINO) && ARDUINO >= 100
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#include "Arduino.h"
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#else
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#include "WProgram.h"
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#endif
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#define NO_NUMBER -1
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// Require DEBOUNCE_DELAY milliseconds between state changes. This value is
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// noted in the class documentation.
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#define DEBOUNCE_DELAY 15
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RotaryDialer::RotaryDialer(int readyPin, int pulsePin) :
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pinReady(readyPin), pinPulse(pulsePin), hasCompletedNumber(false),
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state(WAITING)
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{ }
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void RotaryDialer::setup() {
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pinMode(pinReady, INPUT);
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pinMode(pinPulse, INPUT);
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digitalWrite(pinReady, HIGH);
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digitalWrite(pinPulse, HIGH);
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lastStateChangeMillis = millis();
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}
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bool RotaryDialer::changeStateIfDebounced(enum State newState) {
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unsigned long currentMillis = millis();
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if (currentMillis < lastStateChangeMillis) {
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// clock wrapped; ignore (but could figure it out in this case)
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lastStateChangeMillis = currentMillis;
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return false;
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} else if (currentMillis - lastStateChangeMillis > DEBOUNCE_DELAY) {
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state = newState;
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lastStateChangeMillis = currentMillis;
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return true;
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} else {
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return false;
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}
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}
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void RotaryDialer::completeDial() {
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if (!changeStateIfDebounced(WAITING)) {
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return;
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}
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if (number > 0 && number <= 10) {
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if (number == 10) {
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number = 0;
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}
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hasCompletedNumber = true;
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}
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}
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bool RotaryDialer::update() {
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int readyStatus = digitalRead(pinReady);
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int pulseStatus = digitalRead(pinPulse);
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switch(state) {
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case WAITING:
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if (readyStatus == LOW
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&& changeStateIfDebounced(LISTENING_NOPULSE))
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{
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hasCompletedNumber = false;
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number = 0;
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}
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break;
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case LISTENING_NOPULSE:
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if (readyStatus == HIGH) {
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completeDial();
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} else if (pulseStatus == HIGH) {
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changeStateIfDebounced(LISTENING_PULSE);
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}
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break;
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case LISTENING_PULSE:
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if (readyStatus == HIGH) {
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completeDial();
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} else if (pulseStatus == LOW
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&& changeStateIfDebounced(LISTENING_NOPULSE))
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{
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number++;
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}
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break;
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}
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return hasCompletedNumber;
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}
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bool RotaryDialer::hasNextNumber() {
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return hasCompletedNumber;
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}
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int RotaryDialer::getNextNumber() {
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if (hasCompletedNumber) {
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hasCompletedNumber = false;
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return number;
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} else {
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return NO_NUMBER;
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}
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}
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