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142 lines
2.2 KiB
C++
142 lines
2.2 KiB
C++
//
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// FILE: PCA9549.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.0
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// DATE: 2023-12-12
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// PURPOSE: Arduino Library for PCA9549 I2C octal bus switch.
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// URL: https://github.com/RobTillaart/PCA9549
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#include "PCA9549.h"
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PCA9549::PCA9549(uint8_t deviceAddress, TwoWire *wire)
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{
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_address = deviceAddress;
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_wire = wire;
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_mask = 0x00;
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_resetPin = -1;
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_forced = false;
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_error = PCA9549_OK;
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}
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bool PCA9549::begin(uint8_t mask)
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{
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if (! isConnected()) return false;
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setChannelMask(mask);
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return true;
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}
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bool PCA9549::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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bool PCA9549::enableChannel(uint8_t channel)
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{
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if (channel >= 8) return false;
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if (!isEnabled(channel))
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{
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setChannelMask(_mask | (0x01 << channel));
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}
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return true;
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}
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bool PCA9549::disableChannel(uint8_t channel)
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{
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if (channel >= 8) return false;
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if (!isEnabled(channel))
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{
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setChannelMask(_mask & ~(0x01 << channel));
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}
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return true;
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}
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bool PCA9549::selectChannel(uint8_t channel)
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{
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if (channel >= 8) return false;
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setChannelMask(0x01 << channel);
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return true;
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}
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bool PCA9549::isEnabled(uint8_t channel)
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{
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if (channel >= 8) return false;
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return (_mask & (0x01 << channel));
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}
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bool PCA9549::disableAllChannels()
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{
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return setChannelMask(0x00);
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}
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bool PCA9549::setChannelMask(uint8_t mask)
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{
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if ((_mask == mask) && (not _forced)) return true;
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_mask = mask;
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_wire->beginTransmission(_address);
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_wire->write(_mask);
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_error = _wire->endTransmission();
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return (_error == 0);
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}
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uint8_t PCA9549::getChannelMask()
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{
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if (_forced) // read from device.
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{
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_wire->requestFrom(_address, (uint8_t)1);
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_mask = _wire->read();
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}
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return _mask;
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}
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void PCA9549::setResetPin(uint8_t resetPin)
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{
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_resetPin = resetPin;
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pinMode(_resetPin, OUTPUT);
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digitalWrite(_resetPin, HIGH);
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}
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void PCA9549::reset()
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{
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digitalWrite(_resetPin, LOW);
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delayMicroseconds(1); // TODO datasheet page ? - 500 ns
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digitalWrite(_resetPin, HIGH);
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}
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void PCA9549::setForced(bool forced)
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{
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_forced = forced;
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};
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bool PCA9549::getForced()
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{
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return _forced;
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};
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int PCA9549::getError()
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{
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int error = _error;
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_error = PCA9549_OK;
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return error;
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}
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// -- END OF FILE --
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