mirror of
https://github.com/RobTillaart/Arduino.git
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251 lines
4.3 KiB
C++
251 lines
4.3 KiB
C++
//
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// FILE: TCA9548.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.3.0
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// DATE: 2021-03-16
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// PURPOSE: Arduino Library for TCA9548 I2C multiplexer and compatibles.
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#include "TCA9548.h"
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TCA9548::TCA9548(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 = TCA9548_OK;
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_channels = 8;
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}
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bool TCA9548::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 TCA9548::isConnected()
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{
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return isConnected(_address);
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}
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bool TCA9548::isConnected(uint8_t address)
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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 TCA9548::isConnected(uint8_t address, uint8_t channel)
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{
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if (!selectChannel(channel)) return false;
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return isConnected(address);
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}
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uint8_t TCA9548::find(uint8_t address)
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{
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uint8_t mask = 0x00;
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for (uint8_t ch = 0; ch < _channels; ch++)
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{
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// will work partially if MP is off line (by choice).
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selectChannel(ch);
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if (isConnected(address)) mask |= (1 << ch);
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}
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return mask;
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}
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uint8_t TCA9548::channelCount()
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{
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return _channels;
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}
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bool TCA9548::enableChannel(uint8_t channel)
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{
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if (channel >= _channels) return false;
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return setChannelMask(_mask | (0x01 << channel));
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}
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bool TCA9548::disableChannel(uint8_t channel)
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{
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if (channel >= _channels) return false;
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return setChannelMask(_mask & ~(0x01 << channel));
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}
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bool TCA9548::selectChannel(uint8_t channel)
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{
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if (channel >= _channels) return false;
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return setChannelMask(0x01 << channel);
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}
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bool TCA9548::isEnabled(uint8_t channel)
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{
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if (channel >= _channels) return false;
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return (_mask & (0x01 << channel));
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}
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bool TCA9548::disableAllChannels()
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{
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return setChannelMask(0x00);
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}
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bool TCA9548::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 TCA9548::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 TCA9548::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); // page 3 HIGH is normal operation
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}
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void TCA9548::reset()
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{
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digitalWrite(_resetPin, LOW);
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delayMicroseconds(1); // datasheet page 6 & 7 - 500 ns
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digitalWrite(_resetPin, HIGH);
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}
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void TCA9548::setForced(bool forced)
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{
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_forced = forced;
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};
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bool TCA9548::getForced()
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{
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return _forced;
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};
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int TCA9548::getError()
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{
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int error = _error;
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_error = TCA9548_OK;
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return error;
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}
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/////////////////////////////////////////////////////////////
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//
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// PCA9548
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//
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PCA9548::PCA9548(uint8_t deviceAddress, TwoWire *wire) : TCA9548(deviceAddress, wire)
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{
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_channels = 8;
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}
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/////////////////////////////////////////////////////////////
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//
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// PCA9546
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//
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PCA9546::PCA9546(uint8_t deviceAddress, TwoWire *wire) : TCA9548(deviceAddress, wire)
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{
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_channels = 4;
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}
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uint8_t PCA9546::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 &= 0x0F;
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}
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/////////////////////////////////////////////////////////////
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//
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// PCA9545
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//
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PCA9545::PCA9545(uint8_t deviceAddress, TwoWire *wire) : TCA9548(deviceAddress, wire)
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{
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_channels = 4;
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}
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uint8_t PCA9545::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 &= 0x0F;
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}
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uint8_t PCA9545::getInterruptMask()
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{
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_wire->requestFrom(_address, (uint8_t)1);
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uint8_t mask = _wire->read();
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mask >>= 4;
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return mask;
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}
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/////////////////////////////////////////////////////////////
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//
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// PCA9548
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//
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PCA9543::PCA9543(uint8_t deviceAddress, TwoWire *wire) : TCA9548(deviceAddress, wire)
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{
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_channels = 2;
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}
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uint8_t PCA9543::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 &= 0x03;
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}
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uint8_t PCA9543::getInterruptMask()
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{
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_wire->requestFrom(_address, (uint8_t)1);
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uint8_t mask = _wire->read();
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mask >>= 4;
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return mask;
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}
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// -- END OF FILE --
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