GY-63_MS5611/libraries/rotaryDecoder/rotaryDecoder.cpp
2023-11-21 15:30:00 +01:00

164 lines
2.7 KiB
C++

//
// FILE: rotaryDecoder.cpp
// AUTHOR: Rob Tillaart
// VERSION: 0.2.0
// DATE: 2021-05-08
// PURPOSE: rotary decoder library for Arduino
// URL: https://github.com/RobTillaart/rotaryDecoder
#include "rotaryDecoder.h"
/////////////////////////////////////////////////////
//
// CONSTRUCTORS
//
rotaryDecoder::rotaryDecoder(const int8_t address, TwoWire *wire)
{
_address = address;
_wire = wire;
}
bool rotaryDecoder::begin(uint8_t count)
{
_count = count;
if (_count > 4) _count = 4;
if (! isConnected()) return false;
return true;
}
bool rotaryDecoder::isConnected()
{
_wire->beginTransmission(_address);
return ( _wire->endTransmission() == 0);
}
void rotaryDecoder::readInitialState()
{
uint8_t value = _read8();
_lastValue = value;
for (uint8_t i = 0; i < _count; i++)
{
_lastPos[i] = value & 0x03;
value >>= 2;
}
}
bool rotaryDecoder::checkChange()
{
uint8_t value = _read8();
return (_lastValue != value);
}
bool rotaryDecoder::update()
{
uint8_t value = _read8();
if (_lastValue == value)
{
return false;
}
_lastValue = value;
for (uint8_t i = 0; i < _count; i++, value >>= 2)
{
uint8_t currentpos = (value & 0x03);
uint8_t change = (_lastPos[i] << 2) | currentpos;
switch (change)
{
case 0b0001: // fall through..
case 0b0111:
case 0b1110:
case 0b1000:
_encoder[i]++;
break;
case 0b0010:
case 0b0100:
case 0b1101:
case 0b1011:
_encoder[i]--;
break;
}
_lastPos[i] = currentpos;
}
return true;
}
bool rotaryDecoder::updateSingle()
{
uint8_t value = _read8();
if (_lastValue == value)
{
return false;
}
_lastValue = value;
for (uint8_t i = 0; i < _count; i++, value >>= 2)
{
uint8_t currentpos = (value & 0x03);
uint8_t change = (_lastPos[i] << 2) | currentpos;
switch (change)
{
case 0b0001: // fall through..
case 0b0111:
case 0b1110:
case 0b1000:
_encoder[i] += 1;
break;
case 0b0011:
case 0b0110:
case 0b1001:
case 0b1100:
_encoder[i] += 2;
break;
case 0b0010:
case 0b0100:
case 0b1101:
case 0b1011:
_encoder[i] += 3;
break;
}
_lastPos[i] = currentpos;
}
return true;
}
int32_t rotaryDecoder::getValue(uint8_t re)
{
return _encoder[re];
}
void rotaryDecoder::setValue(uint8_t re, int32_t value)
{
_encoder[re] = value;
}
uint8_t rotaryDecoder::getLastPosition(uint8_t re)
{
return _lastPos[re];
};
/////////////////////////////////////////////////////
//
// PRIVATE
//
uint8_t rotaryDecoder::_read8()
{
_wire->requestFrom(_address, (uint8_t)1);
return _wire->read();
}
// -- END OF FILE --