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https://github.com/RobTillaart/Arduino.git
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183 lines
3.5 KiB
C++
183 lines
3.5 KiB
C++
//
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// FILE: AD524X.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.3.1
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// PURPOSE: I2C digital potentiometer AD5241 AD5242
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// DATE: 2013-10-12
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// URL: https://github.com/RobTillaart/AD524X
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//
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#include "AD524X.h"
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#define AS524X_RDAC0 0x00
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#define AS524X_RDAC1 0x80
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#define AS524X_RESET 0x40
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#define AS524X_SHUTDOWN 0x20
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#define AS524X_O1_HIGH 0x10
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#define AS524X_O2_HIGH 0x08
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AD524X::AD524X(const uint8_t address, TwoWire *wire)
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{
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// address: 0x01011xx = 0x2C - 0x2F
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_address = address;
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_wire = wire;
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_lastValue[0] = _lastValue[1] = 127; // power on reset => mid position
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_O1 = _O2 = 0;
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_pmCount = 2;
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}
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#if defined (ESP8266) || defined(ESP32)
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bool AD524X::begin(uint8_t dataPin, uint8_t clockPin)
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{
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_wire = &Wire;
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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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reset();
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return true;
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}
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#endif
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bool AD524X::begin()
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{
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_wire->begin();
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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 AD524X::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 AD524X::reset()
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{
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write(0, 127, LOW, LOW);
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return write(1, 127);
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}
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uint8_t AD524X::zeroAll()
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{
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write(0, 0, LOW, LOW);
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return write(1, 0);
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}
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uint8_t AD524X::write(const uint8_t rdac, const uint8_t value)
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{
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if (rdac >= _pmCount) return AS524X_ERROR;
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uint8_t cmd = (rdac == 0) ? AS524X_RDAC0 : AS524X_RDAC1;
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// apply the output lines
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cmd = cmd | _O1 | _O2;
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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 AD524X::write(const uint8_t rdac, const uint8_t value, const uint8_t O1, const uint8_t O2)
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{
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if (rdac >= _pmCount) return AS524X_ERROR;
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uint8_t cmd = (rdac == 0) ? AS524X_RDAC0 : AS524X_RDAC1;
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_O1 = (O1 == LOW) ? 0 : AS524X_O1_HIGH;
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_O2 = (O2 == LOW) ? 0 : AS524X_O2_HIGH;
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// apply the output lines
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cmd = cmd | _O1 | _O2;
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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 AD524X::setO1(const uint8_t value)
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{
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_O1 = (value == LOW) ? 0 : AS524X_O1_HIGH;
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uint8_t cmd = AS524X_RDAC0 | _O1 | _O2;
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return send(cmd, _lastValue[0]);
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}
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uint8_t AD524X::setO2(const uint8_t value)
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{
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_O2 = (value == LOW) ? 0: AS524X_O2_HIGH;
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uint8_t cmd = AS524X_RDAC0 | _O1 | _O2;
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return send(cmd, _lastValue[0]);
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}
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uint8_t AD524X::getO1()
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{
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return (_O1 > 0);
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}
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uint8_t AD524X::getO2()
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{
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return (_O2 > 0);
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}
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uint8_t AD524X::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 AD524X::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 AD524X::midScaleReset(const uint8_t rdac)
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{
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if (rdac >= _pmCount) return AS524X_ERROR;
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uint8_t cmd = AS524X_RESET;
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if (rdac == 1) cmd |= AS524X_RDAC1;
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cmd = cmd | _O1 | _O2;
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_lastValue[rdac] = 127;
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return send(cmd, _lastValue[rdac]);
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}
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// read datasheet P.15
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uint8_t AD524X::shutDown()
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{
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uint8_t cmd = AS524X_SHUTDOWN; // TODO TEST & VERIFY
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return send(cmd, 0);
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}
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//////////////////////////////////////////////////////////
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//
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// PRIVATE
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//
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uint8_t AD524X::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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AD5241::AD5241(const uint8_t address, TwoWire *wire) : AD524X(address, wire)
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{
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_pmCount = 1;
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};
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AD5242::AD5242(const uint8_t address, TwoWire *wire) : AD524X(address, wire)
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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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