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https://github.com/RobTillaart/Arduino.git
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761 lines
17 KiB
C++
761 lines
17 KiB
C++
//
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// FILE: ADS1X15.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.5.0
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// DATE: 2013-03-24
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// PURPOSE: Arduino library for ADS1015 and ADS1115
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// URL: https://github.com/RobTillaart/ADS1X15
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#include "ADS1X15.h"
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#define ADS1015_CONVERSION_DELAY 1
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#define ADS1115_CONVERSION_DELAY 8
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// Kept #defines a bit in line with Adafruit library.
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// REGISTERS
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#define ADS1X15_REG_CONVERT 0x00
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#define ADS1X15_REG_CONFIG 0x01
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#define ADS1X15_REG_LOW_THRESHOLD 0x02
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#define ADS1X15_REG_HIGH_THRESHOLD 0x03
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// CONFIG REGISTER
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// BIT 15 Operational Status // 1 << 15
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#define ADS1X15_OS_BUSY 0x0000
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#define ADS1X15_OS_NOT_BUSY 0x8000
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#define ADS1X15_OS_START_SINGLE 0x8000
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// BIT 12-14 read differential
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#define ADS1X15_MUX_DIFF_0_1 0x0000
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#define ADS1X15_MUX_DIFF_0_3 0x1000
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#define ADS1X15_MUX_DIFF_1_3 0x2000
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#define ADS1X15_MUX_DIFF_2_3 0x3000
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// read single
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#define ADS1X15_READ_0 0x4000 // pin << 12
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#define ADS1X15_READ_1 0x5000 // pin = 0..3
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#define ADS1X15_READ_2 0x6000
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#define ADS1X15_READ_3 0x7000
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// BIT 9-11 gain // (0..5) << 9
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#define ADS1X15_PGA_6_144V 0x0000 // voltage
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#define ADS1X15_PGA_4_096V 0x0200 //
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#define ADS1X15_PGA_2_048V 0x0400 // default
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#define ADS1X15_PGA_1_024V 0x0600
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#define ADS1X15_PGA_0_512V 0x0800
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#define ADS1X15_PGA_0_256V 0x0A00
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// BIT 8 mode // 1 << 8
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#define ADS1X15_MODE_CONTINUE 0x0000
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#define ADS1X15_MODE_SINGLE 0x0100
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// BIT 5-7 data rate sample per second // (0..7) << 5
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/*
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differs for different devices, check datasheet or readme.md
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| data rate | ADS101x | ADS111x | Notes |
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|:-----------:|----------:|----------:|:---------:|
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| 0 | 128 | 8 | slowest |
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| 1 | 250 | 16 | |
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| 2 | 490 | 32 | |
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| 3 | 920 | 64 | |
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| 4 | 1600 | 128 | default |
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| 5 | 2400 | 250 | |
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| 6 | 3300 | 475 | |
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| 7 | 3300 | 860 | fastest |
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*/
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// BIT 4 comparator modi // 1 << 4
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#define ADS1X15_COMP_MODE_TRADITIONAL 0x0000
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#define ADS1X15_COMP_MODE_WINDOW 0x0010
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// BIT 3 ALERT active value // 1 << 3
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#define ADS1X15_COMP_POL_ACTIV_LOW 0x0000
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#define ADS1X15_COMP_POL_ACTIV_HIGH 0x0008
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// BIT 2 ALERT latching // 1 << 2
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#define ADS1X15_COMP_NON_LATCH 0x0000
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#define ADS1X15_COMP_LATCH 0x0004
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// BIT 0-1 ALERT mode // (0..3)
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#define ADS1X15_COMP_QUE_1_CONV 0x0000 // trigger alert after 1 convert
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#define ADS1X15_COMP_QUE_2_CONV 0x0001 // trigger alert after 2 converts
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#define ADS1X15_COMP_QUE_4_CONV 0x0002 // trigger alert after 4 converts
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#define ADS1X15_COMP_QUE_NONE 0x0003 // disable comparator
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// _CONFIG masks
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//
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// | bit | description |
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// |:-----:|:-----------------------|
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// | 0 | # channels |
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// | 1 | - |
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// | 2 | resolution |
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// | 3 | - |
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// | 4 | GAIN supported |
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// | 5 | COMPARATOR supported |
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// | 6 | - |
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// | 7 | - |
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//
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#define ADS_CONF_CHAN_1 0x00
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#define ADS_CONF_CHAN_4 0x01
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#define ADS_CONF_RES_12 0x00
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#define ADS_CONF_RES_16 0x04
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#define ADS_CONF_NOGAIN 0x00
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#define ADS_CONF_GAIN 0x10
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#define ADS_CONF_NOCOMP 0x00
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#define ADS_CONF_COMP 0x20
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//////////////////////////////////////////////////////
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//
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// BASE CONSTRUCTOR
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//
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ADS1X15::ADS1X15()
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{
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reset();
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}
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//////////////////////////////////////////////////////
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//
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// PUBLIC
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//
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void ADS1X15::reset()
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{
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setGain(0); // _gain = ADS1X15_PGA_6_144V;
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setMode(1); // _mode = ADS1X15_MODE_SINGLE;
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setDataRate(4); // middle speed, depends on device.
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// COMPARATOR variables # see notes .h
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_compMode = 0;
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_compPol = 1;
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_compLatch = 0;
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_compQueConvert = 3;
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_lastRequest = 0xFFFF; // no request yet
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}
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bool ADS1X15::begin()
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{
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if ((_address < 0x48) || (_address > 0x4B)) return false;
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if (! isConnected()) return false;
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return true;
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}
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bool ADS1X15::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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void ADS1X15::setGain(uint8_t gain)
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{
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if (!(_config & ADS_CONF_GAIN)) gain = 0;
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switch (gain)
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{
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default: // catch invalid values and go for the safest gain.
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case 0: _gain = ADS1X15_PGA_6_144V; break;
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case 1: _gain = ADS1X15_PGA_4_096V; break;
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case 2: _gain = ADS1X15_PGA_2_048V; break;
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case 4: _gain = ADS1X15_PGA_1_024V; break;
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case 8: _gain = ADS1X15_PGA_0_512V; break;
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case 16: _gain = ADS1X15_PGA_0_256V; break;
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}
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}
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uint8_t ADS1X15::getGain()
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{
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if (!(_config & ADS_CONF_GAIN)) return 0;
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switch (_gain)
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{
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case ADS1X15_PGA_6_144V: return 0;
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case ADS1X15_PGA_4_096V: return 1;
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case ADS1X15_PGA_2_048V: return 2;
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case ADS1X15_PGA_1_024V: return 4;
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case ADS1X15_PGA_0_512V: return 8;
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case ADS1X15_PGA_0_256V: return 16;
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}
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_error = ADS1X15_INVALID_GAIN;
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return _error;
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}
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float ADS1X15::toVoltage(int16_t value)
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{
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if (value == 0) return 0;
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float volts = getMaxVoltage();
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if (volts < 0) return volts; // propagate error
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volts *= value;
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if (_config & ADS_CONF_RES_16)
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{
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volts /= 32767; // value = 16 bits - sign bit = 15 bits mantissa
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}
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else
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{
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volts /= 2047; // value = 12 bits - sign bit = 11 bit mantissa
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}
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return volts;
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}
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float ADS1X15::getMaxVoltage()
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{
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switch (_gain)
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{
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case ADS1X15_PGA_6_144V: return 6.144;
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case ADS1X15_PGA_4_096V: return 4.096;
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case ADS1X15_PGA_2_048V: return 2.048;
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case ADS1X15_PGA_1_024V: return 1.024;
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case ADS1X15_PGA_0_512V: return 0.512;
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case ADS1X15_PGA_0_256V: return 0.256;
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}
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_error = ADS1X15_INVALID_VOLTAGE;
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return _error;
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}
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void ADS1X15::setMode(uint8_t mode)
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{
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switch (mode)
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{
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case 0: _mode = ADS1X15_MODE_CONTINUE; break;
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default:
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case 1: _mode = ADS1X15_MODE_SINGLE; break;
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}
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}
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uint8_t ADS1X15::getMode(void)
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{
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switch (_mode)
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{
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case ADS1X15_MODE_CONTINUE: return 0;
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case ADS1X15_MODE_SINGLE: return 1;
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}
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_error = ADS1X15_INVALID_MODE;
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return _error;
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}
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void ADS1X15::setDataRate(uint8_t dataRate)
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{
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_datarate = dataRate;
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if (_datarate > 7) _datarate = 4; // default
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_datarate <<= 5; // convert 0..7 to mask needed.
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}
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uint8_t ADS1X15::getDataRate(void)
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{
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return (_datarate >> 5) & 0x07; // convert mask back to 0..7
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}
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int16_t ADS1X15::readADC(uint8_t pin)
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{
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if (pin >= _maxPorts) return 0;
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uint16_t mode = ((4 + pin) << 12); // pin to mask
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return _readADC(mode);
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}
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int16_t ADS1X15::readADC_Differential_0_1()
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{
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return _readADC(ADS1X15_MUX_DIFF_0_1);
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}
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int16_t ADS1X15::getValue()
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{
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int16_t raw = _readRegister(_address, ADS1X15_REG_CONVERT);
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if (_bitShift) raw >>= _bitShift; // Shift 12-bit results
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return raw;
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}
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void ADS1X15::requestADC(uint8_t pin)
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{
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if (pin >= _maxPorts) return;
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uint16_t mode = ((4 + pin) << 12); // pin to mask
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_requestADC(mode);
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}
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void ADS1X15::requestADC_Differential_0_1()
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{
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_requestADC(ADS1X15_MUX_DIFF_0_1);
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}
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bool ADS1X15::isBusy()
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{
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return isReady() == false;
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}
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bool ADS1X15::isReady()
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{
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uint16_t val = _readRegister(_address, ADS1X15_REG_CONFIG);
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return ((val & ADS1X15_OS_NOT_BUSY) > 0);
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}
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uint8_t ADS1X15::lastRequest()
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{
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switch (_lastRequest)
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{
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case ADS1X15_READ_0: return 0x00;
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case ADS1X15_READ_1: return 0x01;
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case ADS1X15_READ_2: return 0x02;
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case ADS1X15_READ_3: return 0x03;
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// technically 0x01 -- but would collide with READ_1
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case ADS1X15_MUX_DIFF_0_1: return 0x10;
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case ADS1X15_MUX_DIFF_0_3: return 0x30;
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case ADS1X15_MUX_DIFF_1_3: return 0x31;
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case ADS1X15_MUX_DIFF_2_3: return 0x32;
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}
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return 0xFF;
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}
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void ADS1X15::setComparatorMode(uint8_t mode)
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{
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_compMode = mode == 0 ? 0 : 1;
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}
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uint8_t ADS1X15::getComparatorMode()
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{
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return _compMode;
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}
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void ADS1X15::setComparatorPolarity(uint8_t pol)
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{
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_compPol = pol == 0 ? 0 : 1;
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}
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uint8_t ADS1X15::getComparatorPolarity()
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{
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return _compPol;
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}
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void ADS1X15::setComparatorLatch(uint8_t latch)
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{
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_compLatch = latch == 0 ? 0 : 1;
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}
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uint8_t ADS1X15::getComparatorLatch()
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{
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return _compLatch;
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}
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void ADS1X15::setComparatorQueConvert(uint8_t mode)
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{
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_compQueConvert = (mode < 3) ? mode : 3;
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}
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uint8_t ADS1X15::getComparatorQueConvert()
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{
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return _compQueConvert;
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}
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void ADS1X15::setComparatorThresholdLow(int16_t lo)
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{
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_writeRegister(_address, ADS1X15_REG_LOW_THRESHOLD, lo);
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}
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int16_t ADS1X15::getComparatorThresholdLow()
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{
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return _readRegister(_address, ADS1X15_REG_LOW_THRESHOLD);
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};
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void ADS1X15::setComparatorThresholdHigh(int16_t hi)
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{
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_writeRegister(_address, ADS1X15_REG_HIGH_THRESHOLD, hi);
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};
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int16_t ADS1X15::getComparatorThresholdHigh()
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{
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return _readRegister(_address, ADS1X15_REG_HIGH_THRESHOLD);
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};
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int8_t ADS1X15::getError()
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{
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int8_t rv = _error;
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_error = ADS1X15_OK;
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return rv;
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}
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//////////////////////////////////////////////////////
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//
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// EXPERIMENTAL
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//
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void ADS1X15::setWireClock(uint32_t clockSpeed)
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{
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_clockSpeed = clockSpeed;
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_wire->setClock(_clockSpeed);
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}
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// see https://github.com/RobTillaart/ADS1X15/issues/22
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// https://github.com/arduino/Arduino/issues/11457
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// TODO: get the real clock speed from the I2C interface if possible.
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uint32_t ADS1X15::getWireClock()
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{
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// UNO 328 and
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#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168__)
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uint32_t speed = F_CPU / ((TWBR * 2) + 16);
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return speed;
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#elif defined(ESP32)
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return (uint32_t) _wire->getClock();
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// #elif defined(ESP8266)
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// core_esp8266_si2c.cpp holds the data see => void Twi::setClock(
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// not supported.
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// return -1;
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#else // best effort is remembering it
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return _clockSpeed;
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#endif
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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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int16_t ADS1X15::_readADC(uint16_t readmode)
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{
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_requestADC(readmode);
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if (_mode == ADS1X15_MODE_SINGLE)
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{
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uint32_t start = millis();
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// timeout == { 129, 65, 33, 17, 9, 5, 3, 2 }
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// a few ms more than max conversion time.
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uint8_t timeOut = (128 >> (_datarate >> 5)) + 1;
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while (isBusy())
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{
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yield(); // wait for conversion; yield for ESP.
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if ( (millis() - start) > timeOut)
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{
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return ADS1X15_ERROR_TIMEOUT;
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}
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}
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}
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else
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{
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// needed in continuous mode too, otherwise one get old value.
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delay(_conversionDelay);
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}
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return getValue();
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}
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void ADS1X15::_requestADC(uint16_t readmode)
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{
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// write to register is needed in continuous mode as other flags can be changed
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uint16_t config = ADS1X15_OS_START_SINGLE; // bit 15 force wake up if needed
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config |= readmode; // bit 12-14
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config |= _gain; // bit 9-11
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config |= _mode; // bit 8
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config |= _datarate; // bit 5-7
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if (_compMode) config |= ADS1X15_COMP_MODE_WINDOW; // bit 4 comparator modi
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else config |= ADS1X15_COMP_MODE_TRADITIONAL;
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if (_compPol) config |= ADS1X15_COMP_POL_ACTIV_HIGH; // bit 3 ALERT active value
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else config |= ADS1X15_COMP_POL_ACTIV_LOW;
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if (_compLatch) config |= ADS1X15_COMP_LATCH;
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else config |= ADS1X15_COMP_NON_LATCH; // bit 2 ALERT latching
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config |= _compQueConvert; // bit 0..1 ALERT mode
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_writeRegister(_address, ADS1X15_REG_CONFIG, config);
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// remember last request type.
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_lastRequest = readmode;
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}
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bool ADS1X15::_writeRegister(uint8_t address, uint8_t reg, uint16_t value)
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{
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_wire->beginTransmission(address);
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_wire->write((uint8_t)reg);
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_wire->write((uint8_t)(value >> 8));
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_wire->write((uint8_t)(value & 0xFF));
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int rv = _wire->endTransmission();
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if (rv != 0)
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{
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_error = ADS1X15_ERROR_I2C;
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return false;
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}
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return true;
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}
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uint16_t ADS1X15::_readRegister(uint8_t address, uint8_t reg)
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{
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_wire->beginTransmission(address);
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_wire->write(reg);
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int rv = _wire->endTransmission();
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if (rv == 0)
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{
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rv = _wire->requestFrom((int) address, (int) 2);
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if (rv == 2)
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{
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uint16_t value = _wire->read() << 8;
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value += _wire->read();
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return value;
|
|
}
|
|
}
|
|
_error = ADS1X15_ERROR_I2C;
|
|
return 0x0000;
|
|
}
|
|
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// DERIVED CLASSES
|
|
//
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// ADS1013
|
|
//
|
|
ADS1013::ADS1013(uint8_t address, TwoWire *wire)
|
|
{
|
|
_address = address;
|
|
_wire = wire;
|
|
_config = ADS_CONF_NOCOMP | ADS_CONF_NOGAIN | ADS_CONF_RES_12 | ADS_CONF_CHAN_1;
|
|
_conversionDelay = ADS1015_CONVERSION_DELAY;
|
|
_bitShift = 4;
|
|
_maxPorts = 1;
|
|
_gain = ADS1X15_PGA_2_048V; // fixed value
|
|
}
|
|
|
|
|
|
// ADS1x13 has no gain so set default.
|
|
// Table 8. Config Register Field Descriptions
|
|
void ADS1013::setGain(uint8_t gain)
|
|
{
|
|
_gain = gain; // keep compiler happy.
|
|
_gain = ADS1X15_PGA_2_048V; // fixed value
|
|
}
|
|
|
|
|
|
uint8_t ADS1013::getGain()
|
|
{
|
|
return 2; // fixed value
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// ADS1014
|
|
//
|
|
ADS1014::ADS1014(uint8_t address, TwoWire *wire)
|
|
{
|
|
_address = address;
|
|
_wire = wire;
|
|
_config = ADS_CONF_COMP | ADS_CONF_GAIN | ADS_CONF_RES_12 | ADS_CONF_CHAN_1;
|
|
_conversionDelay = ADS1015_CONVERSION_DELAY;
|
|
_bitShift = 4;
|
|
_maxPorts = 1;
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// ADS1015
|
|
//
|
|
ADS1015::ADS1015(uint8_t address, TwoWire *wire)
|
|
{
|
|
_address = address;
|
|
_wire = wire;
|
|
_config = ADS_CONF_COMP | ADS_CONF_GAIN | ADS_CONF_RES_12 | ADS_CONF_CHAN_4;
|
|
_conversionDelay = ADS1015_CONVERSION_DELAY;
|
|
_bitShift = 4;
|
|
_maxPorts = 4;
|
|
}
|
|
|
|
|
|
int16_t ADS1015::readADC_Differential_0_3()
|
|
{
|
|
return _readADC(ADS1X15_MUX_DIFF_0_3);
|
|
}
|
|
|
|
|
|
int16_t ADS1015::readADC_Differential_1_3()
|
|
{
|
|
return _readADC(ADS1X15_MUX_DIFF_1_3);
|
|
}
|
|
|
|
|
|
int16_t ADS1015::readADC_Differential_2_3()
|
|
{
|
|
return _readADC(ADS1X15_MUX_DIFF_2_3);
|
|
}
|
|
|
|
|
|
int16_t ADS1015::readADC_Differential_0_2()
|
|
{
|
|
return readADC(2) - readADC(0);
|
|
}
|
|
|
|
|
|
int16_t ADS1015::readADC_Differential_1_2()
|
|
{
|
|
return readADC(2) - readADC(1);;
|
|
}
|
|
|
|
|
|
void ADS1015::requestADC_Differential_0_3()
|
|
{
|
|
_requestADC(ADS1X15_MUX_DIFF_0_3);
|
|
}
|
|
|
|
|
|
void ADS1015::requestADC_Differential_1_3()
|
|
{
|
|
_requestADC(ADS1X15_MUX_DIFF_1_3);
|
|
}
|
|
|
|
|
|
void ADS1015::requestADC_Differential_2_3()
|
|
{
|
|
_requestADC(ADS1X15_MUX_DIFF_2_3);
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// ADS1113
|
|
//
|
|
ADS1113::ADS1113(uint8_t address, TwoWire *wire)
|
|
{
|
|
_address = address;
|
|
_wire = wire;
|
|
_config = ADS_CONF_NOCOMP | ADS_CONF_NOGAIN | ADS_CONF_RES_16 | ADS_CONF_CHAN_1;
|
|
_conversionDelay = ADS1115_CONVERSION_DELAY;
|
|
_bitShift = 0;
|
|
_maxPorts = 1;
|
|
_gain = ADS1X15_PGA_2_048V; // fixed value
|
|
}
|
|
|
|
|
|
// ADS1x13 has no gain so set default.
|
|
// Table 8. Config Register Field Descriptions
|
|
void ADS1113::setGain(uint8_t gain)
|
|
{
|
|
_gain = gain; // keep compiler happy.
|
|
_gain = ADS1X15_PGA_2_048V; // fixed value
|
|
}
|
|
|
|
|
|
uint8_t ADS1113::getGain()
|
|
{
|
|
return 2; // fixed value
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// ADS1114
|
|
//
|
|
ADS1114::ADS1114(uint8_t address, TwoWire *wire)
|
|
{
|
|
_address = address;
|
|
_wire = wire;
|
|
_config = ADS_CONF_COMP | ADS_CONF_GAIN | ADS_CONF_RES_16 | ADS_CONF_CHAN_1;
|
|
_conversionDelay = ADS1115_CONVERSION_DELAY;
|
|
_bitShift = 0;
|
|
_maxPorts = 1;
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// ADS1115
|
|
//
|
|
ADS1115::ADS1115(uint8_t address, TwoWire *wire)
|
|
{
|
|
_address = address;
|
|
_wire = wire;
|
|
_config = ADS_CONF_COMP | ADS_CONF_GAIN | ADS_CONF_RES_16 | ADS_CONF_CHAN_4;
|
|
_conversionDelay = ADS1115_CONVERSION_DELAY;
|
|
_bitShift = 0;
|
|
_maxPorts = 4;
|
|
}
|
|
|
|
|
|
int16_t ADS1115::readADC_Differential_0_3()
|
|
{
|
|
return _readADC(ADS1X15_MUX_DIFF_0_3);
|
|
}
|
|
|
|
|
|
int16_t ADS1115::readADC_Differential_1_3()
|
|
{
|
|
return _readADC(ADS1X15_MUX_DIFF_1_3);
|
|
}
|
|
|
|
|
|
int16_t ADS1115::readADC_Differential_2_3()
|
|
{
|
|
return _readADC(ADS1X15_MUX_DIFF_2_3);
|
|
}
|
|
|
|
|
|
int16_t ADS1115::readADC_Differential_0_2()
|
|
{
|
|
return readADC(2) - readADC(0);
|
|
}
|
|
|
|
|
|
int16_t ADS1115::readADC_Differential_1_2()
|
|
{
|
|
return readADC(2) - readADC(1);;
|
|
}
|
|
|
|
|
|
void ADS1115::requestADC_Differential_0_3()
|
|
{
|
|
_requestADC(ADS1X15_MUX_DIFF_0_3);
|
|
}
|
|
|
|
|
|
void ADS1115::requestADC_Differential_1_3()
|
|
{
|
|
_requestADC(ADS1X15_MUX_DIFF_1_3);
|
|
}
|
|
|
|
|
|
void ADS1115::requestADC_Differential_2_3()
|
|
{
|
|
_requestADC(ADS1X15_MUX_DIFF_2_3);
|
|
}
|
|
|
|
|
|
// -- END OF FILE --
|
|
|