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/*****************************************
* This is a library for the ADS1115 A/D Converter
*
* You'll find an example which should enable you to use the library.
*
* You are free to use it, change it or build on it. In case you like
* it, it would be cool if you give it a star.
*
* If you find bugs, please inform me!
*
* Written by Wolfgang (Wolle) Ewald
* https://wolles-elektronikkiste.de
*
*******************************************/
#include "ADS1115_WE.h"
ADS1115_WE::ADS1115_WE(int addr){
i2cAddress = addr;
}
ADS1115_WE::ADS1115_WE(){
i2cAddress = 0x48;
}
void ADS1115_WE::reset(){
Wire.beginTransmission(0);
Wire.write(0x06);
Wire.endTransmission();
}
bool ADS1115_WE::init(){
Wire.beginTransmission(i2cAddress);
bool success = Wire.endTransmission();
if(success){
return 0;
}
writeRegister(ADS1115_CONFIG_REG, ADS1115_REG_RESET_VAL);
setVoltageRange_mV(ADS1115_RANGE_2048);
writeRegister(ADS1115_LO_THRESH_REG, 0x8000);
writeRegister(ADS1115_HI_THRESH_REG, 0x7FFF);
return 1;
}
void ADS1115_WE::setAlertPinMode(ADS1115_COMP_QUE mode){
uint16_t currentConfReg = readRegister(ADS1115_CONFIG_REG);
currentConfReg &= ~(0x0003);
currentConfReg |= mode;
writeRegister(ADS1115_CONFIG_REG, currentConfReg);
}
void ADS1115_WE::setAlertLatch(ADS1115_LATCH latch){
uint16_t currentConfReg = readRegister(ADS1115_CONFIG_REG);
currentConfReg &= ~(0x0004);
currentConfReg |= latch;
writeRegister(ADS1115_CONFIG_REG, currentConfReg);
}
void ADS1115_WE::setAlertPol(ADS1115_ALERT_POL polarity){
uint16_t currentConfReg = readRegister(ADS1115_CONFIG_REG);
currentConfReg &= ~(0x0008);
currentConfReg |= polarity;
writeRegister(ADS1115_CONFIG_REG, currentConfReg);
}
void ADS1115_WE::setAlertModeAndLimit_V(ADS1115_COMP_MODE mode, float hiThres, float loThres){
uint16_t currentConfReg = readRegister(ADS1115_CONFIG_REG);
currentConfReg &= ~(0x0010);
currentConfReg |= mode;
writeRegister(ADS1115_CONFIG_REG, currentConfReg);
int16_t alertLimit = calcLimit(hiThres);
writeRegister(ADS1115_HI_THRESH_REG, alertLimit);
alertLimit = calcLimit(loThres);
writeRegister(ADS1115_LO_THRESH_REG, alertLimit);
}
void ADS1115_WE::setConvRate(ADS1115_CONV_RATE rate){
uint16_t currentConfReg = readRegister(ADS1115_CONFIG_REG);
currentConfReg &= ~(0x00E0);
currentConfReg |= rate;
writeRegister(ADS1115_CONFIG_REG, currentConfReg);
}
void ADS1115_WE::setMeasureMode(ADS1115_MEASURE_MODE mode){
uint16_t currentConfReg = readRegister(ADS1115_CONFIG_REG);
currentConfReg &= ~(0x0100);
currentConfReg |= mode;
writeRegister(ADS1115_CONFIG_REG, currentConfReg);
}
void ADS1115_WE::setVoltageRange_mV(ADS1115_RANGE range){
uint16_t currentVoltageRange = voltageRange;
switch(range){
case ADS1115_RANGE_6144:
voltageRange = 6144;
break;
case ADS1115_RANGE_4096:
voltageRange = 4096;
break;
case ADS1115_RANGE_2048:
voltageRange = 2048;
break;
case ADS1115_RANGE_1024:
voltageRange = 1024;
break;
case ADS1115_RANGE_0512:
voltageRange = 512;
break;
case ADS1115_RANGE_0256:
voltageRange = 256;
break;
}
uint16_t currentConfReg = readRegister(ADS1115_CONFIG_REG);
uint16_t currentRange = (currentConfReg >> 9) & 7;
uint16_t currentAlertPinMode = currentConfReg & 3;
uint16_t currentCompMode = (currentConfReg>>4) & 1;
currentConfReg &= ~(0x0E00);
currentConfReg |= range;
writeRegister(ADS1115_CONFIG_REG, currentConfReg);
if ((currentRange != range) && (currentAlertPinMode != ADS1115_DISABLE_ALERT)){
int16_t alertLimit = readRegister(ADS1115_HI_THRESH_REG);
alertLimit = alertLimit * (currentVoltageRange * 1.0 / voltageRange);
writeRegister(ADS1115_HI_THRESH_REG, alertLimit);
alertLimit = readRegister(ADS1115_LO_THRESH_REG);
alertLimit = alertLimit * (currentVoltageRange * 1.0 / voltageRange);
writeRegister(ADS1115_LO_THRESH_REG, alertLimit);
}
}
void ADS1115_WE::setCompareChannels(ADS1115_MUX mux){
uint16_t currentConfReg = readRegister(ADS1115_CONFIG_REG);
currentConfReg &= ~(0x7000);
currentConfReg |= (mux);
writeRegister(ADS1115_CONFIG_REG, currentConfReg);
}
bool ADS1115_WE::isBusy(){
uint16_t currentConfReg = readRegister(ADS1115_CONFIG_REG);
return (!(currentConfReg>>15) & 1);
}
void ADS1115_WE::startSingleMeasurement(){
uint16_t currentConfReg = readRegister(ADS1115_CONFIG_REG);
currentConfReg |= (1 << 15);
writeRegister(ADS1115_CONFIG_REG, currentConfReg);
}
float ADS1115_WE::getResult_V(){
int16_t rawResult = readRegister(ADS1115_CONV_REG);
float result = (rawResult * 1.0 / ADS1115_REG_FACTOR) * voltageRange/1000;
return result;
}
float ADS1115_WE::getResult_mV(){
int16_t rawResult = readRegister(ADS1115_CONV_REG);
float result = (rawResult * 1.0 / ADS1115_REG_FACTOR) * voltageRange;
return result;
}
void ADS1115_WE::setAlertPinToConversionReady(){
writeRegister(ADS1115_LO_THRESH_REG, (0<<15));
writeRegister(ADS1115_HI_THRESH_REG, (1<<15));
}
void ADS1115_WE::clearAlert(){
readRegister(ADS1115_CONV_REG);
}
/************************************************
private functions
*************************************************/
int16_t ADS1115_WE::calcLimit(float rawLimit){
int16_t limit = (int16_t)((rawLimit * ADS1115_REG_FACTOR / voltageRange)*1000);
return limit;
}
uint8_t ADS1115_WE::writeRegister(uint8_t reg, uint16_t val){
Wire.beginTransmission(i2cAddress);
uint8_t lVal = val & 255;
uint8_t hVal = val >> 8;
Wire.write(reg);
Wire.write(hVal);
Wire.write(lVal);
return Wire.endTransmission();
}
uint16_t ADS1115_WE::readRegister(uint8_t reg){
uint8_t MSByte, LSByte = 0;
uint16_t regValue = 0;
Wire.beginTransmission(i2cAddress);
Wire.write(reg);
Wire.endTransmission();
Wire.requestFrom(i2cAddress,2);
if(Wire.available()){
MSByte = Wire.read();
LSByte = Wire.read();
}
regValue = (MSByte<<8) + LSByte;
return regValue;
}
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