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0.1.1 MCP3424
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Rob Tillaart
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@ -6,6 +6,14 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/)
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and this project adheres to [Semantic Versioning](http://semver.org/).
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## [0.1.1] - 2024-09-18
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- add derived classes for MCP3421/2/3/6/7/8
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- extend unit tests.
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- fixed **getMode()** to return 1 (continuous) or 0 (single shot).
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- fixed math of **floats readVolts()** et al.
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- update readme.md
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- minor edits
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## [0.1.0] - 2024-09-15
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- initial version
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@ -1,7 +1,7 @@
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//
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// FILE: MCP3424.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.0
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// VERSION: 0.1.1
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// PURPOSE: Arduino library for 18 bit ADC I2C MCP3424 and compatibles.
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// URL: https://github.com/RobTillaart/MCP3424
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@ -23,8 +23,7 @@ MCP3424::MCP3424(uint8_t address, TwoWire *wire)
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_gain = 1;
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_bits = 12;
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_mode = 0; // CONTINUOUS
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_config = 0x10;
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_config = 0x10; // default
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}
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@ -60,47 +59,52 @@ int32_t MCP3424::read()
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}
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// shift is to calculate the LSB factor.
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// 18 bits => 1, LSB == 15.625 uV
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// 16 bits => 4, LSB == 62.5 uV
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// 14 bits => 16, LSB == 250 uV
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// 12 bits => 64 LSB == 1000 uV = 1 mV
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// must be multiplied to float first to prevent
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// losing bits due to integer division
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float MCP3424::readVolts()
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{
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// TODO
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// pre calculate float _factor = 15.625e-6 * pow(2, (_bits - 12))/ _gain;
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return read() * 15.625e-6 * pow(2, (_bits - 12))/ _gain;
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return read() * (15.625e-6 * (1L << (18 - _bits))) / _gain;
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}
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float MCP3424::readMilliVolts()
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{
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return read() * 15.625e-3 * pow(2, (_bits - 12))/ _gain;
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return read() * (15.625e-3 * (1L << (18 - _bits))) / _gain;
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}
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float MCP3424::readMicroVolts()
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{
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return read() * 15.625e0 * pow(2, (_bits - 12))/ _gain;
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return read() * (15.625e0 * (1L << (18 - _bits))) / _gain;
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}
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// TODO move to derived class with more than one channel?
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bool MCP3424::setChannel(uint8_t channel)
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{
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if (channel >= _maxChannels)
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{
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return false;
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}
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// only update if changed
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if (_channel != channel)
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{
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_channel = channel;
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_config &= 0x1F; // channel = 0
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// if (channel > 0) => _config |= (channel << 4)
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if (channel == 1) _config |= 0x20;
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if (channel == 2) _config |= 0x40;
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if (channel == 3) _config |= 0x60;
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else if (channel == 2) _config |= 0x40;
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else if (channel == 3) _config |= 0x60;
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}
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writeConfig();
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return true;
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}
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// TODO move to derived class with more than one channel?
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uint8_t MCP3424::getChannel()
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{
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return _channel;
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@ -113,13 +117,14 @@ bool MCP3424::setGain(uint8_t gain)
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{
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return false;
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}
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// only update if changed.
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if (_gain != gain)
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{
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_gain = gain;
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_config &= 0xFC; // gain == 1
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if (_gain == 2) _config |= 0x01;
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if (_gain == 4) _config |= 0x02;
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if (_gain == 8) _config |= 0x03;
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else if (_gain == 4) _config |= 0x02;
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else if (_gain == 8) _config |= 0x03;
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writeConfig();
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}
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return true;
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@ -138,13 +143,14 @@ bool MCP3424::setResolution(uint8_t bits)
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{
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return false;
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}
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// only update if changed.
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if (_bits != bits)
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{
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_bits = bits;
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_config &= 0xF3; // bits == 12
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if (_bits == 14) _config |= 0x04;
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if (_bits == 16) _config |= 0x08;
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if (_bits == 18) _config |= 0x0C;
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else if (_bits == 16) _config |= 0x08;
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else if (_bits == 18) _config |= 0x0C;
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writeConfig();
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}
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return true;
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@ -153,27 +159,34 @@ bool MCP3424::setResolution(uint8_t bits)
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uint8_t MCP3424::getResolution()
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{
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// return 12 + 2 * ((_config >> 2) & 0x03);
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return _bits;
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}
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void MCP3424::setContinuousMode()
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{
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_config &= ~0x10;
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if (getMode() != 1)
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{
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_config |= 0x10;
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writeConfig();
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}
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}
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void MCP3424::setSingleShotMode()
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{
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_config |= 0x10;
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if (getMode() != 0)
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{
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_config &= ~0x10;
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writeConfig();
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}
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}
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uint8_t MCP3424::getMode()
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{
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return (_config & 0x10);
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return (_config & 0x10) ? 1 : 0;
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}
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@ -226,5 +239,42 @@ int32_t MCP3424::readRaw()
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}
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/////////////////////////////////////////////////////////////////////////////
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//
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// DERIVED CLASSES
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//
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MCP3421::MCP3421(uint8_t address, TwoWire *wire) : MCP3424(address, wire)
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{
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_maxChannels = 1;
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}
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MCP3422::MCP3422(uint8_t address, TwoWire *wire) : MCP3424(address, wire)
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{
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_maxChannels = 2;
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}
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MCP3423::MCP3423(uint8_t address, TwoWire *wire) : MCP3424(address, wire)
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{
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_maxChannels = 2;
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}
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MCP3426::MCP3426(uint8_t address, TwoWire *wire) : MCP3424(address, wire)
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{
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_maxChannels = 2;
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}
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MCP3427::MCP3427(uint8_t address, TwoWire *wire) : MCP3424(address, wire)
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{
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_maxChannels = 2;
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}
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MCP3428::MCP3428(uint8_t address, TwoWire *wire) : MCP3424(address, wire)
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{
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_maxChannels = 4;
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}
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// -- END OF FILE --
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@ -2,7 +2,7 @@
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//
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// FILE: MCP3424.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.0
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// VERSION: 0.1.1
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// PURPOSE: Arduino library for 18 bit ADC I2C MCP3424 and compatibles.
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// URL: https://github.com/RobTillaart/MCP3424
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@ -10,15 +10,9 @@
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#include "Arduino.h"
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#include "Wire.h"
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#define MCP3424_LIB_VERSION (F("0.1.0"))
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#define MCP3424_LIB_VERSION (F("0.1.1"))
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// TODO
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// - ERROR HANDLING
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// - READ STATUS
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// - CACHE LAST READ
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//
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class MCP3424
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{
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public:
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@ -50,12 +44,11 @@ public:
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uint8_t getMode();
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private:
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protected:
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uint8_t _maxChannels;
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uint8_t _channel;
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uint8_t _gain;
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uint8_t _bits;
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uint8_t _mode;
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uint8_t _config;
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uint8_t _address;
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@ -66,5 +59,49 @@ private:
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};
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/////////////////////////////////////////////////////////////////////////////
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//
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// DERIVED CLASSES
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//
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class MCP3421 : public MCP3424
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{
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public:
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MCP3421(uint8_t address = 0x68, TwoWire *wire = &Wire);
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};
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class MCP3422 : public MCP3424
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{
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public:
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MCP3422(uint8_t address = 0x68, TwoWire *wire = &Wire);
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};
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class MCP3423 : public MCP3424
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{
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public:
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MCP3423(uint8_t address = 0x68, TwoWire *wire = &Wire);
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};
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//
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// max 16 bit
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//
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class MCP3426 : public MCP3424
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{
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public:
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MCP3426(uint8_t address = 0x68, TwoWire *wire = &Wire);
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};
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class MCP3427 : public MCP3424
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{
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public:
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MCP3427(uint8_t address = 0x68, TwoWire *wire = &Wire);
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};
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class MCP3428 : public MCP3424
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{
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public:
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MCP3428(uint8_t address = 0x68, TwoWire *wire = &Wire);
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};
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// -- END OF FILE --
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@ -25,10 +25,13 @@ This library is to be used to configure and read the 18 bit MCP4324 4 channel AD
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The MCP3424 is not a fast ADC, however with 18 bit it has at least a very high
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resolution. What the effects of the long sampling time means is to be investigated.
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The high resolution combined with an optional gain of 8x means one could
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measure voltage in steps of about 2 µV
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measure voltage in steps of about 2 µV.
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The library has three functions that return a reading in volts, millivolts or
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microvolts to match the need of the user.
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The library cannot check yet if a conversion is ready.
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Need hardware to check how this works in detail.
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The library has three functions that return a reading in Volts, milliVolts or
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microVolts to match the need of the user.
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The user has to configure the ADC device (bits, gain) and can call
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**read()** (et al) without parameters to keep usage straightforward.
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@ -37,7 +40,7 @@ Current implementation will probably change slightly in the future
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when related devices will be supported. (See future section).
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Alt-230 = µ
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Alt-230 = µ
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### Resolution
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@ -45,23 +48,33 @@ Alt-230 =
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| Bits | LSB (gain=1) | SPS | Raw range | Notes |
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|:------:|---------------:|:------:|:-------------------:|:-------:|
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| 12 | 1 mV | 240 | -2048 .. 2047 |
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| 14 | 250 µV | 60 | -8192 .. 8191 |
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| 16 | 62.5 µV | 15 | -32768 .. 32767 |
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| 18 | 15.625 µV | 3.75 | -131072 .. 131071 | not for 3426/27/28.
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| 14 | 250 µV | 60 | -8192 .. 8191 |
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| 16 | 62.5 µV | 15 | -32768 .. 32767 |
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| 18 | 15.625 µV | 3.75 | -131072 .. 131071 | not for 3426/27/28.
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The effective resolution also depends on the gain set.
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In theory with a gain of 8 the LSB of the 18 bit resolution represents
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1/8 of 15.625 µV == 1.95 µV.
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1/8 of 15.625 µV == 1.95 µV.
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If this is feasible in practice is to be seen.
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### I2C Address
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The MCP3421 has a fixed address 0x68, one can order different addresses at factory (how?).
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The MCP3421 and MCP3426 have a fixed address 0x68, one can order different
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addresses at the factory (how?).
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TODO Table of addresses?
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The other devices have two address pins to set 8 addresses. The trick is
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to leave address pins floating. See datasheet table 5.3 for details.
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Max speed ? 400 KHz.
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### I2C Speed
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The MCP342x devices support 100 KHz, 400 KHz and 3.4 MHz.
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The latter is not (yet) supported by the library.
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The sketch **MCP3424_performance.ino** can be used to get some insight
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in the performance. It will check up to 800 kHz.
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TODO verify with hardware.
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### I2C multiplexing
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@ -99,14 +112,14 @@ too if they are behind the multiplexer.
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### Constructor
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TODO other constructors.
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- **MCP3424(uint8_t address = 0x68, TwoWire \*wire = &Wire)**
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- **bool begin()** initializes the device. POR?
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- **bool isConnected()** checks if the device address can be seen on I2C bus.
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- **uint8_t getAddress()** idem, convenience function.
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- **uint8_t getMaxChannels()** idem, convenience function.
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The MCP3421/2/3/6/7/8 constructors have the same parameters.
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### Read
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@ -130,51 +143,65 @@ that it will take some time before the conversion with new settings is done.
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- **bool setChannel(uint8_t channel = 0)** not to be used for the MCP3421 as
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it has only one channel. Default is channel 0, parameter should be less than the
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value of **getMaxChannels()**.
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- **uint8_t getChannel()** returns chosen channel, 0 based. e
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- **uint8_t getChannel()** returns chosen channel (default 0).
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- **bool setGain(uint8_t gain = 1)** set gain to 1,2,4, or 8.
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Other values will return false and not change the setting.
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- **uint8_t getGain()** returns the set gain (default 1).
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- **bool setResolution(uint8_t bits = 12)** set the bit resolution 12,14,16 or 18.
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Other values will return false and not change the setting.
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- **uint8_t getResolution()** returns the set resolution.
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- **uint8_t getResolution()** returns the set resolution (default 12).
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- **void setContinuousMode()** idem.
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- **void setSingleShotMode()** idem.
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- **uint8_t getMode()** idem.
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- **uint8_t getMode()** returns 0 for singleShot and 1 for continuous.
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The set function write their changes directly to the device. It might be better
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to have one function to set all parameters in one call. To be investigated.
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The library caches the last configuration, it is not read back from the device.
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This might be added in the future.
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## Future
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#### Must
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- investigate reading of ready flag
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- get hardware to test.
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- redo interface for MCP3424 if needed.
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- investigate ready flag
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- investigate continuous vs single shot.
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- investigate continuous vs single shot mode.
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- improve documentation
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- Table of addresses.
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#### Should
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- implement support for (separate classes ?)
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- 18 bit, MCP3421/MCP3422/MCP3423
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- 16 bit: MCP3426/MCP3427/MCP3428 (no 18 bit so not 100% compatible)
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- test on different boards.
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- optimize performance (a lot of same math in conversion to voltage)
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- optimize performance if possible
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- check performance I2C with HW
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- optimize setting all configuration in one function call.
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- PowerOnReset function for configuration
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- **setConfig(channel, resolution, gain, mode)** ?
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- getter needed?
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- implement PowerOnReset function for configuration
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#### Could
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- implement maxResolution (combine with maxChannels? in one "maxValue" byte)
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- check range in **setResolution()**.
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- extract gain and resolution from the config byte to reduce storage.
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- like **getMode()**.
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- extend examples
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- array of ADC's
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- mcp3424_plotter
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- add error handling
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- add error variable
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- check return value **writeConfig()**.
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- check read() process.
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#### Wont
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- cache last read value. (difficult for wrappers)
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## Support
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@ -1,7 +1,7 @@
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//
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// FILE: MCP3424_test.ino
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// FILE: MCP3424_performance.ino
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// AUTHOR: Rob Tillaart
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// PURPOSE: basic test API calls.
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// PURPOSE: basic performance test API calls.
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// URL: https://github.com/RobTillaart/MCP3424
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//
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// needs a device connected to be able to test.
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@ -38,6 +38,8 @@ void setup()
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Serial.println(mcp.getGain());
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Serial.print("Bits:\t");
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Serial.println(mcp.getResolution());
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Serial.print("Mode:\t");
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Serial.println(mcp.getMode());
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Serial.println();
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delay(100);
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@ -7,11 +7,9 @@
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#include "MCP3424.h"
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MCP3424 mcp;
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void setup()
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{
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Serial.begin(115200);
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@ -36,6 +34,8 @@ void setup()
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Serial.println(mcp.getGain());
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Serial.print("Bits:\t");
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Serial.println(mcp.getResolution());
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Serial.print("Mode:\t");
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Serial.println(mcp.getMode());
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Serial.println();
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|
||||
Serial.println("GAIN 1");
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
{
|
||||
"name": "MCP3424",
|
||||
"keywords": "",
|
||||
"keywords": "MCP3421,MCP3422,MCP3423,MCP3426,MCP3427,MCP3428",
|
||||
"description": "Arduino library for 18 bit ADC I2C MCP3424 et al.",
|
||||
"authors":
|
||||
[
|
||||
@ -15,7 +15,7 @@
|
||||
"type": "git",
|
||||
"url": "https://github.com/RobTillaart/MCP3424.git"
|
||||
},
|
||||
"version": "0.1.0",
|
||||
"version": "0.1.1",
|
||||
"license": "MIT",
|
||||
"frameworks": "*",
|
||||
"platforms": "*",
|
||||
|
||||
@ -1,9 +1,9 @@
|
||||
name=MCP3424
|
||||
version=0.1.0
|
||||
version=0.1.1
|
||||
author=Rob Tillaart <rob.tillaart@gmail.com>
|
||||
maintainer=Rob Tillaart <rob.tillaart@gmail.com>
|
||||
sentence=Arduino library for 18 bit ADC I2C MCP3424 et al.
|
||||
paragraph=
|
||||
paragraph=MCP3421,MCP3422,MCP3423,MCP3426,MCP3427,MCP3428
|
||||
category=Sensors
|
||||
url=https://github.com/RobTillaart/MCP3424
|
||||
architectures=*
|
||||
|
||||
@ -45,15 +45,55 @@ unittest(test_constants)
|
||||
}
|
||||
|
||||
|
||||
unittest(test_constructor)
|
||||
unittest(test_constructors)
|
||||
{
|
||||
MCP3421 mcp1;
|
||||
MCP3422 mcp2;
|
||||
MCP3423 mcp3;
|
||||
MCP3424 mcp4;
|
||||
MCP3426 mcp6;
|
||||
MCP3427 mcp7;
|
||||
MCP3428 mcp8;
|
||||
|
||||
// base class
|
||||
assertEqual(0, mcp4.getChannel());
|
||||
assertEqual(4, mcp4.getMaxChannels());
|
||||
assertEqual(1, mcp4.getGain());
|
||||
assertEqual(12, mcp4.getResolution());
|
||||
assertEqual(1, mcp4.getMode());
|
||||
|
||||
// check MAX channels derived classes
|
||||
assertEqual(1, mcp1.getMaxChannels());
|
||||
assertEqual(2, mcp2.getMaxChannels());
|
||||
assertEqual(2, mcp3.getMaxChannels());
|
||||
assertEqual(4, mcp4.getMaxChannels());
|
||||
assertEqual(2, mcp6.getMaxChannels());
|
||||
assertEqual(2, mcp7.getMaxChannels());
|
||||
assertEqual(4, mcp8.getMaxChannels());
|
||||
}
|
||||
|
||||
|
||||
unittest(test_channel)
|
||||
{
|
||||
MCP3424 mcp;
|
||||
|
||||
assertEqual(0, mcp.getChannel());
|
||||
assertEqual(4, mcp.getMaxChannels());
|
||||
assertEqual(1, mcp.getGain());
|
||||
assertEqual(12, mcp.getResolution());
|
||||
// mode
|
||||
|
||||
assertTrue(mcp.setChannel(1));
|
||||
assertEqual(1, mcp.getChannel());
|
||||
|
||||
assertTrue(mcp.setChannel(2));
|
||||
assertEqual(2, mcp.getChannel());
|
||||
|
||||
assertTrue(mcp.setChannel(3));
|
||||
assertEqual(3, mcp.getChannel());
|
||||
|
||||
// default
|
||||
assertTrue(mcp.setChannel());
|
||||
assertEqual(0, mcp.getChannel());
|
||||
|
||||
// out of range
|
||||
assertFalse(mcp.setChannel(5));
|
||||
}
|
||||
|
||||
|
||||
@ -72,9 +112,11 @@ unittest(test_gain)
|
||||
assertTrue(mcp.setGain(8));
|
||||
assertEqual(8, mcp.getGain());
|
||||
|
||||
// default
|
||||
assertTrue(mcp.setGain());
|
||||
assertEqual(1, mcp.getGain());
|
||||
|
||||
// out of range
|
||||
assertFalse(mcp.setGain(0));
|
||||
}
|
||||
|
||||
@ -94,13 +136,29 @@ unittest(test_resolution)
|
||||
assertTrue(mcp.setResolution(18));
|
||||
assertEqual(18, mcp.getResolution());
|
||||
|
||||
// default
|
||||
assertTrue(mcp.setResolution());
|
||||
assertEqual(12, mcp.getResolution());
|
||||
|
||||
// out of range
|
||||
assertFalse(mcp.setResolution(13));
|
||||
}
|
||||
|
||||
|
||||
unittest(test_mode)
|
||||
{
|
||||
MCP3424 mcp;
|
||||
|
||||
assertEqual(1, mcp.getMode());
|
||||
|
||||
mcp.setSingleShotMode();
|
||||
assertEqual(0, mcp.getMode());
|
||||
|
||||
mcp.setContinuousMode();
|
||||
assertEqual(1, mcp.getMode());
|
||||
}
|
||||
|
||||
|
||||
unittest_main()
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user