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https://github.com/RobTillaart/Arduino.git
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142 lines
2.4 KiB
C++
142 lines
2.4 KiB
C++
//
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// FILE: AD5248.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.1
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// PURPOSE: Library for I2C digital potentiometer AD5243 + rheostat AD5248
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// DATE: 2023-12-12
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// URL: https://github.com/RobTillaart/AD5248
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#include "AD5248.h"
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#define AD5248_RDAC0 0x00
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#define AD5248_RDAC1 0x80
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#define AD5248_RESET 0x40
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#define AD5248_SHUTDOWN 0x20
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#define AD5243_ADDRESS 0x2F
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AD5248::AD5248(uint8_t address, TwoWire *wire)
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{
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_address = address;
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_wire = wire;
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// power on reset => mid position
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_lastValue[0] = _lastValue[1] = AD5248_MIDPOINT;
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_pmCount = 2;
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}
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bool AD5248::begin()
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{
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if (! isConnected()) return false;
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reset();
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return true;
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}
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bool AD5248::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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uint8_t AD5248::getAddress()
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{
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return _address;
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}
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uint8_t AD5248::reset()
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{
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write(0, AD5248_MIDPOINT);
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return write(1, AD5248_MIDPOINT);
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}
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uint8_t AD5248::zeroAll()
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{
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write(0, 0);
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return write(1, 0);
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}
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uint8_t AD5248::write(const uint8_t rdac, const uint8_t value)
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{
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if (rdac >= _pmCount) return AD5248_ERROR;
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uint8_t cmd = (rdac == 0) ? AD5248_RDAC0 : AD5248_RDAC1;
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_lastValue[rdac] = value;
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return send(cmd, value);
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}
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uint8_t AD5248::read(const uint8_t rdac)
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{
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return _lastValue[rdac];
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}
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uint8_t AD5248::readBackRegister()
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{
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_wire->beginTransmission(_address);
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_wire->endTransmission();
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_wire->requestFrom(_address, (uint8_t)1);
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return _wire->read();
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}
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uint8_t AD5248::midScaleReset(const uint8_t rdac)
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{
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if (rdac >= _pmCount) return AD5248_ERROR;
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uint8_t cmd = AD5248_RESET;
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if (rdac == 1) cmd |= AD5248_RDAC1;
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_lastValue[rdac] = AD5248_MIDPOINT;
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return send(cmd, _lastValue[rdac]);
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}
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// read datasheet P.??
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uint8_t AD5248::shutDown()
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{
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uint8_t cmd = AD5248_SHUTDOWN; // TODO TEST & VERIFY
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return send(cmd, 0);
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}
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uint8_t AD5248::pmCount()
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{
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return _pmCount;
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}
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//////////////////////////////////////////////////////////
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//
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// PROTECTED
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//
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uint8_t AD5248::send(const uint8_t cmd, const uint8_t value)
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{
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_wire->beginTransmission(_address);
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_wire->write(cmd);
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_wire->write(value);
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return _wire->endTransmission();
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}
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//////////////////////////////////////////////////////////////
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//
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// DERIVED CLASS AD5243 potentiometer
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//
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AD5243::AD5243(TwoWire * wire) : AD5248(AD5243_ADDRESS, wire) // fixed address
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{
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_pmCount = 2;
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}
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// -- END OF FILE --
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