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PotBreakout.cpp
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PotBreakout.cpp
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#include "PotBreakout.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
// CONSTRUCTORS/DESTRUCTOR
////////////////////////////////////////////////////////////////////////////////////////////////////
PotBreakout::PotBreakout(TwoWire& wire, uint8_t address, float brightness, uint32_t timeout, int8_t interruptPin, bool debug)
: _ioe(wire, address, timeout, interruptPin, debug)
, _direction(true) //clockwise
, _brightness(brightness)
{
}
////////////////////////////////////////////////////////////////////////////////////////////////////
// METHODS
////////////////////////////////////////////////////////////////////////////////////////////////////
bool PotBreakout::initialise(bool skipChipIdCheck)
{
bool bSucceeded = true;
if(_ioe.initialise(skipChipIdCheck))
{
_ioe.setMode(PIN_TERM_A, IOExpander::PIN_OUT);
_ioe.setMode(PIN_TERM_B, IOExpander::PIN_OUT);
_ioe.setMode(PIN_INPUT, IOExpander::PIN_ADC);
if(_direction)
{
//Clockwise increasing
_ioe.output(PIN_TERM_A, LOW);
_ioe.output(PIN_TERM_B, HIGH);
}
else
{
//Counter clockwise increasing
_ioe.output(PIN_TERM_A, HIGH);
_ioe.output(PIN_TERM_B, LOW);
}
//Calculate a period large enough to get 0-255 steps at the desired brightness
unsigned int period = (unsigned int)(255.0f / _brightness);
_ioe.setPwmPeriod(period);
_ioe.setPwmControl(2); //PWM as fast as we can to avoid LED flicker
_ioe.setMode(PIN_RED, IOExpander::PIN_PWM, false, INVERT_OUTPUT);
_ioe.setMode(PIN_GREEN, IOExpander::PIN_PWM, false, INVERT_OUTPUT);
_ioe.setMode(PIN_BLUE, IOExpander::PIN_PWM, false, INVERT_OUTPUT);
bSucceeded = true;
}
return bSucceeded;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void PotBreakout::setAddr(uint8_t i2cAddr)
{
_ioe.setAddr(i2cAddr);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
float PotBreakout::getAdcVref(void)
{
return _ioe.getAdcVref();
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void PotBreakout::setAdcVref(float vref)
{
_ioe.setAdcVref(vref);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
bool PotBreakout::getDirection(void)
{
return _direction;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void PotBreakout::setDirection(bool clockwise)
{
if(clockwise)
{
//Clockwise increasing
_ioe.output(PIN_TERM_A, LOW);
_ioe.output(PIN_TERM_B, HIGH);
}
else
{
//Counter clockwise increasing
_ioe.output(PIN_TERM_A, HIGH);
_ioe.output(PIN_TERM_B, LOW);
}
_direction = clockwise;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void PotBreakout::setBrightness(float brightness)
{
_brightness = constrain(brightness, 0.01f, 1.0f);
//Calculate a period large enough to get 0-255 steps at the desired brightness
unsigned int period = (unsigned int)(255.0f / _brightness);
_ioe.setPwmPeriod(period);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
void PotBreakout::setRGB(uint8_t r, uint8_t g, uint8_t b)
{
_ioe.output(PIN_RED, r, false); //Hold off pwm load until the last
_ioe.output(PIN_GREEN, g, false); //Hold off pwm load until the last
_ioe.output(PIN_BLUE, b); //Loads all 3 pwms
}
////////////////////////////////////////////////////////////////////////////////////////////////////
int16_t PotBreakout::read(uint32_t adcTimeout)
{
return _ioe.input(PIN_INPUT, adcTimeout);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
float PotBreakout::readAsPercent(uint32_t adcTimeout)
{
return (_ioe.inputAsVoltage(PIN_INPUT, adcTimeout) / _ioe.getAdcVref());
}
////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////