mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-10-03 18:09:02 -04:00
164 lines
2.7 KiB
C++
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 --
|
|
|