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https://github.com/RobTillaart/Arduino.git
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164 lines
2.7 KiB
C++
164 lines
2.7 KiB
C++
//
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// FILE: rotaryDecoder.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.1
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// DATE: 2021-05-08
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// PURPOSE: rotary decoder library for Arduino
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// URL: https://github.com/RobTillaart/rotaryDecoder
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#include "rotaryDecoder.h"
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/////////////////////////////////////////////////////
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//
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// CONSTRUCTORS
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//
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rotaryDecoder::rotaryDecoder(const int8_t address, TwoWire *wire)
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{
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_address = address;
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_wire = wire;
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}
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bool rotaryDecoder::begin(uint8_t count)
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{
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_count = count;
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if (_count > 4) _count = 4;
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if (! isConnected()) return false;
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return true;
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}
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bool rotaryDecoder::isConnected()
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{
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_wire->beginTransmission(_address);
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return ( _wire->endTransmission() == 0);
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}
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void rotaryDecoder::readInitialState()
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{
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uint8_t value = _read8();
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_lastValue = value;
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for (uint8_t i = 0; i < _count; i++)
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{
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_lastPos[i] = value & 0x03;
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value >>= 2;
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}
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}
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bool rotaryDecoder::checkChange()
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{
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uint8_t value = _read8();
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return (_lastValue != value);
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}
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bool rotaryDecoder::update()
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{
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uint8_t value = _read8();
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if (_lastValue == value)
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{
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return false;
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}
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_lastValue = value;
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for (uint8_t i = 0; i < _count; i++, value >>= 2)
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{
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uint8_t currentpos = (value & 0x03);
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uint8_t change = (_lastPos[i] << 2) | currentpos;
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switch (change)
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{
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case 0b0001: // fall through..
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case 0b0111:
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case 0b1110:
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case 0b1000:
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_encoder[i]++;
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break;
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case 0b0010:
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case 0b0100:
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case 0b1101:
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case 0b1011:
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_encoder[i]--;
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break;
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}
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_lastPos[i] = currentpos;
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}
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return true;
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}
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bool rotaryDecoder::updateSingle()
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{
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uint8_t value = _read8();
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if (_lastValue == value)
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{
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return false;
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}
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_lastValue = value;
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for (uint8_t i = 0; i < _count; i++, value >>= 2)
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{
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uint8_t currentpos = (value & 0x03);
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uint8_t change = (_lastPos[i] << 2) | currentpos;
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switch (change)
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{
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case 0b0001: // fall through..
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case 0b0111:
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case 0b1110:
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case 0b1000:
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_encoder[i] += 1;
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break;
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case 0b0011:
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case 0b0110:
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case 0b1001:
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case 0b1100:
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_encoder[i] += 2;
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break;
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case 0b0010:
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case 0b0100:
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case 0b1101:
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case 0b1011:
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_encoder[i] += 3;
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break;
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}
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_lastPos[i] = currentpos;
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}
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return true;
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}
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int32_t rotaryDecoder::getValue(uint8_t re)
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{
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return _encoder[re];
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}
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void rotaryDecoder::setValue(uint8_t re, int32_t value)
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{
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_encoder[re] = value;
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}
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uint8_t rotaryDecoder::getLastPosition(uint8_t re)
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{
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return _lastPos[re];
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};
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/////////////////////////////////////////////////////
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//
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// PRIVATE
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//
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uint8_t rotaryDecoder::_read8()
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{
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_wire->requestFrom(_address, (uint8_t)1);
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return _wire->read();
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}
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// -- END OF FILE --
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