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DFRobot_ADS1115.cpp
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DFRobot_ADS1115.cpp
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/*!
* @file DFRobot_ADS1115.cpp
* @brief Provides an Arduino library to read ADS1115 data over I2C. Use this library to read analog voltage values.
*
* @copyright Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
* @license The MIT License (MIT)
* @author [luoyufeng]([email protected]),
* @version V1.0
* @date 2019-06-19
* @url https://github.com/DFRobot/DFRobot_ADS1115
*/
#include "Arduino.h"
#include <Wire.h>
#include <math.h>
#include "DFRobot_ADS1115.h"
float coefficient = 0.0625;
/*
*Instantiates a new ADS1115 class with appropriate properties
*/
void DFRobot_ADS1115::setAddr_ADS1115(uint8_t i2cAddress)
{
ads_i2cAddress = i2cAddress;
ads_conversionDelay = DFROBOT_ADS1115_CONVERSIONDELAY;
}
/*
*Sets up the Hardware
*/
void DFRobot_ADS1115::init()
{
Wire.begin();
}
bool DFRobot_ADS1115::checkADS1115()
{
uint8_t error;
ads_i2cAddress;
Wire.beginTransmission(ads_i2cAddress);
error = Wire.endTransmission();
if(error == 0){
return true;
}else{
return false;
}
}
/*
*Sets the low threshold value
*/
void DFRobot_ADS1115::setLowThreshold(int16_t threshold)
{
ads_lowthreshold = threshold;
writeAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_LOWTHRESH, ads_lowthreshold);
}
/*
*Gets the low threshold value
*/
int16_t DFRobot_ADS1115::getLowThreshold()
{
return ads_lowthreshold;
}
/*
*Sets the high threshold value
*/
void DFRobot_ADS1115::setHighThreshold(int16_t threshold)
{
ads_highthreshold = threshold;
writeAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_HITHRESH, ads_highthreshold);
}
/*
*Gets the high threshold value
*/
int16_t DFRobot_ADS1115::getHighThreshold()
{
return ads_highthreshold;
}
void DFRobot_ADS1115::setCompQue(eADSCompQue_t value){
int16_t conf;
conf = readAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG);
conf &= ~((uint16_t) 0x03);
conf |= (uint16_t) value;
writeAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG, conf);
}
void DFRobot_ADS1115::setCompLat(eADSCompLat_t value){
int16_t conf;
conf = readAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG);
conf &= ~((uint16_t) 0x01 << 2);
conf |= (uint16_t) value << 2;
writeAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG, conf);
}
void DFRobot_ADS1115::setCompPol(eADSCompPol_t value){
int16_t conf;
conf = readAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG);
conf &= ~((uint16_t) 0x01 << 3);
conf |= (uint16_t) value << 3;
writeAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG, conf);
}
void DFRobot_ADS1115::setCompMode(eADSCompMode_t value){
int16_t conf;
conf = readAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG);
conf &= ~((uint16_t) 0x01 << 4);
conf |= (uint16_t) value << 4;
writeAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG, conf);
}
void DFRobot_ADS1115::setRate(eADSRate_t value){
int16_t conf;
conf = readAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG);
conf &= ~((uint16_t) 0x07 << 5);
conf |= (uint16_t) value << 5;
writeAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG, conf);
}
void DFRobot_ADS1115::setMode(eADSMode_t value){
int16_t conf;
conf = readAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG);
conf &= ~((uint16_t) 0x01 << 8);
conf |= (uint16_t) value << 8;
writeAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG, conf);
}
void DFRobot_ADS1115::setGain(eADSGain_t value){
int16_t conf;
conf = readAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG);
conf &= ~((uint16_t) 0x07 << 9);
conf |= (uint16_t) value << 9;
writeAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG, conf);
switch(value){
case eGAIN_TWO:
coefficient = 0.0625;
break;
case eGAIN_TWOTHIRDS:
coefficient = 0.1875;
break;
case eGAIN_ONE:
coefficient = 0.125;
break;
case eGAIN_FOUR:
coefficient = 0.03125;
break;
case eGAIN_EIGHT:
coefficient = 0.015625;
break;
case eGAIN_SIXTEEN:
coefficient = 0.0078125;
break;
default:
coefficient = 0.0625;
break;
}
}
void DFRobot_ADS1115::setMux(eADSMux_t value){
int16_t conf;
conf = readAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG);
conf &= ~((uint16_t) 0x07 << 12);
conf |= (uint16_t) value << 12;
writeAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG, conf);
}
void DFRobot_ADS1115::setOSMode(eADSOSMode_t value){
int16_t conf;
conf = readAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG);
conf &= ~((uint16_t) 0x01 << 15);
conf |= (uint16_t) value << 15;
writeAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG, conf);
}
/*
*Reads the conversion results, measuring the voltage
*for a single-ended ADC reading from the specified channel
*Negative voltages cannot be applied to this circuit because the
*ADS1115 can only accept positive voltages
*/
uint16_t DFRobot_ADS1115::readVoltage(uint8_t channel)
{
if (channel > 3)
return 0;
// Start with default config values
setCompQue(eCOMPQUE_NONE);
setCompLat(eCOMPLAT_NONLAT);
setCompPol(eCOMPPOL_LOW);
setCompMode(eCOMPMODE_TRAD);
if (channel == 0)
setMux(eADSMUX_5);
else if (channel == 1)
setMux(eADSMUX_6);
else if (channel == 2)
setMux(eADSMUX_7);
else if (channel == 3)
setMux(eADSMUX_8);
// Wait for the conversion to complete
uint16_t config = readAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONFIG);
delay(ads_conversionDelay);
// Read the conversion results
// 16-bit unsigned results for the ADS1115
int16_t Voltage = 0;
Voltage = (int16_t)readAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONVERT)*coefficient;
return Voltage;
}
/*
*Sets up the comparator causing the ALERT/RDY pin to assert
*(go from high to low) when the ADC value exceeds the
*specified upper or lower threshold
*ADC is Differential input channel
*/
/**************************************************************************/
int16_t DFRobot_ADS1115::comparatorVoltage(uint8_t channel)
{
// Start with default values
uint16_t config;
// Set Comparator mode
setCompMode(eCOMPMODE_TRAD);
// Set Comparator polarity
setCompPol(eCOMPPOL_LOW);
// Set Latching comparator
setCompLat(eCOMPLAT_NONLAT);
// Set Comparator queue and disable
setCompQue(eCOMPQUE_NONE);
// Set Differential input channel
if (channel == 01)
setMux(eADSMUX_1); // AIN0 = P, AIN1 = N
else if (channel == 03)
setMux(eADSMUX_2); // AIN0 = P, AIN3 = N
else if (channel == 13)
setMux(eADSMUX_3); // AIN1 = P, AIN3 = N
else if (channel == 23)
setMux(eADSMUX_4); // AIN2 = P, AIN3 = N
// Wait for the conversion to complete
delay(ads_conversionDelay);
// Read the conversion results
int16_t Voltage = 0;
Voltage = (int16_t)readAdsReg(ads_i2cAddress, DFROBOT_ADS1115_POINTER_CONVERT)*coefficient;
return Voltage;
}
void DFRobot_ADS1115::writeReg(uint8_t i2cAddress, uint8_t reg, uint8_t *pBuf, uint16_t len)
{
_pWire->begin();
_pWire->beginTransmission(i2cAddress);
_pWire->write(reg);
for(uint16_t i = 0; i < len; i ++)
_pWire->write(pBuf[i]);
_pWire->endTransmission();
}
void DFRobot_ADS1115::readReg(uint8_t i2cAddress, uint8_t reg, uint8_t *pBuf, uint16_t len)
{
_pWire->begin();
_pWire->beginTransmission(i2cAddress);
_pWire->write(reg);
if(_pWire->endTransmission() != 0)
return;
_pWire->requestFrom(i2cAddress, (uint8_t) len);
for(uint16_t i = 0; i < len; i ++) {
pBuf[i] = _pWire->read();
}
_pWire->endTransmission();
}
int16_t DFRobot_ADS1115::readAdsReg(uint8_t i2cAddress, uint8_t reg)
{
uint8_t buf[2] = {0};
readReg(i2cAddress, reg, buf, sizeof(buf));
return (buf[0] << 8) | buf[1];
}
void DFRobot_ADS1115::writeAdsReg(uint8_t i2cAddress, uint8_t reg, uint16_t value)
{
uint8_t buffer[2] = {(value >> 8), value & 0xff};
writeReg(i2cAddress, reg, buffer, 2);
}