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https://github.com/RobTillaart/Arduino.git
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145 lines
2.5 KiB
C++
145 lines
2.5 KiB
C++
//
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// FILE: TCA9548.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.2
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// DATE: 2021-03-16
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// PURPOSE: Library for TCA9548 I2C multiplexer
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//
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// HISTORY:
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// 0.1.0 2021-03-16 initial version
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// 0.1.1 2021-11-19 fix reset code (from datasheet)
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// implemented forced IO
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// update build-CI, readme.md, badges
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// 0.1.2 2021-12-28 update license, minor edits
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#include "TCA9548.h"
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TCA9548::TCA9548(const 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 = 0;
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}
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#if defined (ESP8266) || defined(ESP32)
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bool TCA9548::begin(uint8_t dataPin, uint8_t clockPin, uint8_t mask)
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{
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if ((dataPin < 255) && (clockPin < 255))
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{
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_wire->begin(dataPin, clockPin);
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} else {
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_wire->begin();
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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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#endif
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bool TCA9548::begin(uint8_t mask)
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{
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_wire->begin();
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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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_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)
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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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void TCA9548::enableChannel(uint8_t channel)
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{
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if (isEnabled(channel)) return;
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setChannelMask(_mask | (0x01 << channel));
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}
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void TCA9548::disableChannel(uint8_t channel)
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{
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if (!isEnabled(channel)) return;
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setChannelMask(_mask & ~(0x01 << channel));
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}
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void TCA9548::selectChannel(uint8_t channel)
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{
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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 > 7) return false;
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return (_mask & (0x01 << channel));
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}
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void TCA9548::setChannelMask(uint8_t mask)
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{
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if ((_mask == mask) && (! _forced)) return;
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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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}
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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, 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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int TCA9548::getError()
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{
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int e = _error;
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_error = 0;
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return e;
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}
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// -- END OF FILE --
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