mirror of
https://github.com/RobTillaart/Arduino.git
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167 lines
2.8 KiB
C++
167 lines
2.8 KiB
C++
//
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// FILE: MAX520.cpp
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// AUTHOR: Rob Tillaart
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// DATE: 2024-03-06
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// VERSION: 0.1.1
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// PURPOSE: Arduino library for MAX520 and MAX521 4/8 channel 8 bit DAC.
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// URL: https://github.com/RobTillaart/MAX520
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#include "MAX520.h"
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#define MAX520_RESET 0x10
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#define MAX520_POWERDOWN 0x08
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#define MAX520_WAKEUP 0x00
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///////////////////////////////////////////////////////////
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//
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// CONSTRUCTOR
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//
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MAX520::MAX520(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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_channels = 4;
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_error = MAX520_OK;
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}
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bool MAX520::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 MAX520::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 MAX520::setAddress(const uint8_t deviceAddress)
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{
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_address = deviceAddress;
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return isConnected();
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}
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uint8_t MAX520::getAddress()
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{
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return _address;
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}
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uint8_t MAX520::getChannels()
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{
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return _channels;
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}
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///////////////////////////////////////////////////////////
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//
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// READ WRITE
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//
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int MAX520::write(uint8_t channel, uint8_t value)
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{
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if (channel >= _channels) return MAX520_CHANNEL_ERROR;
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_values[channel] = value;
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uint8_t command = channel;
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_wire->beginTransmission(_address);
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_wire->write(command);
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_wire->write(value);
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return _wire->endTransmission();
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}
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// Can be optimized with one I2C transaction.
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// page 11 figure 7
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int MAX520::write(uint8_t * values)
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{
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for (int i = 0; i < _channels; i++)
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{
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uint8_t rv = write(i, values[i]);
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if (rv != MAX520_OK)
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{
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return rv;
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}
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}
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return MAX520_OK;
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}
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int MAX520::read(uint8_t channel)
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{
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if (channel >= _channels)
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{
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_error = MAX520_CHANNEL_ERROR;
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return 255; // buggy
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}
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_error = MAX520_OK;
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return _values[channel];
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}
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///////////////////////////////////////////////////////////
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//
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// RESET (page 11) and POWER DOWN (page12)
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//
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int MAX520::reset()
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{
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for (int i = 0; i < _channels; i++)
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{
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_values[i] = 0;
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}
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_wire->beginTransmission(_address);
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_wire->write(MAX520_RESET);
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_wire->write(0x00); // needs a value to ignore
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return _wire->endTransmission();
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}
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int MAX520::powerDown()
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{
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_wire->beginTransmission(_address);
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_wire->write(MAX520_POWERDOWN);
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return _wire->endTransmission();
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}
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int MAX520::wakeUp()
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{
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_wire->beginTransmission(_address);
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_wire->write(MAX520_WAKEUP);
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return _wire->endTransmission();
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}
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///////////////////////////////////////////////////////////
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//
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// DEBUG
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//
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int MAX520::lastError()
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{
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int e = _error;
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_error = MAX520_OK; // reset error after read, is this wise?
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return e;
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}
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///////////////////////////////////////////////////////////
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//
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// DERIVED CLASS MAX521
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//
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MAX521::MAX521(uint8_t deviceAddress, TwoWire *wire) : MAX520(deviceAddress, wire)
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{
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_channels = 8;
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}
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// -- END OF FILE --
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