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/*
* Author: Marc Graham <marc@m2ag.net>
* Copyright (c) 2015 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "ads1x15.h"
#include <unistd.h>
using namespace upm;
ADS1X15::ADS1X15(int bus, uint8_t address){
if(!(i2c = new mraa::I2c(bus))){
throw std::invalid_argument(std::string(__FUNCTION__) +": I2c.init() failed");
return;
}
if((i2c->address(address) != mraa::SUCCESS)){
throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.address() failed");
return;
}
if(i2c->frequency( mraa::I2C_FAST) != mraa::SUCCESS){
throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.frequency(I2C_FAST) failed");
return;
}
//Will be reset by sub class.
m_bitShift = 0;
m_conversionDelay = .001;
m_config_reg = 0x0000;
}
ADS1X15::~ADS1X15(){}
float
ADS1X15::getSample(ADSMUXMODE mode){
updateConfigRegister((m_config_reg & ~ADS1X15_MUX_MASK) | mode, true);
usleep(m_conversionDelay);
return getLastSample();
}
float
ADS1X15::getLastSample(int reg){
uint16_t value = i2c->readWordReg(reg);
bool neg = false;
value = swapWord(value);
if(value & 0x8000){
neg = true;
value = ~value;
}
if(m_name == "ADS1015") value = value >> m_bitShift;
if(neg) return 0.0 - value * getMultiplier();
else return value * getMultiplier();
}
void
ADS1X15::setGain(ADSGAIN gain){
updateConfigRegister((m_config_reg & ~ADS1X15_PGA_MASK) | gain);
}
void
ADS1X15::setSPS(ADSSAMPLERATE rate){
updateConfigRegister((m_config_reg & ~ADS1X15_DR_MASK) | rate);
}
void
ADS1X15::setCompMode(bool mode){
if(mode) updateConfigRegister((m_config_reg & ~ADS1X15_CMODE_MASK));
else updateConfigRegister((m_config_reg & ~ADS1X15_CMODE_MASK) | ADS1X15_CMODE_WINDOW);
}
void
ADS1X15::setCompPol(bool mode){
if(!mode) updateConfigRegister((m_config_reg & ~ADS1X15_CPOL_MASK));
else updateConfigRegister((m_config_reg & ~ADS1X15_CPOL_MASK) | ADS1X15_CPOL_ACTVHI);
}
void
ADS1X15::setCompLatch(bool mode){
if(mode) updateConfigRegister((m_config_reg & ~ADS1X15_CLAT_MASK));
else updateConfigRegister((m_config_reg & ~ADS1X15_CLAT_MASK) | ADS1X15_CLAT_LATCH);
}
void
ADS1X15::setCompQue(ADSCOMP mode){
updateConfigRegister((m_config_reg & ~ADS1X15_CQUE_MASK) | mode);
}
void
ADS1X15::setContinuous(bool mode){
if(mode) updateConfigRegister((m_config_reg & ~ADS1X15_MODE_MASK));
else updateConfigRegister((m_config_reg & ~ADS1X15_MODE_MASK) | ADS1X15_MODE_SINGLE);
}
float
ADS1X15::getThresh(ADSTHRESH reg){
if( THRESH_HIGH && THRESH_LOW) return getLastSample(reg);
else return 0.0;
}
void
ADS1X15::setThresh(ADSTHRESH reg, float value){
uint16_t set_value;
switch((int)reg){
case 4: //set conversion_rdy operation
if(i2c->writeWordReg(ADS1X15_REG_POINTER_LOWTHRESH, 0x0000) != mraa::SUCCESS){
throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.write() failed");
return;
}
if(i2c->writeWordReg(ADS1X15_REG_POINTER_HITHRESH, 0x0080) != mraa::SUCCESS){
throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.write() failed");
return;
}
break;
case 2:
case 3:
set_value = value / getMultiplier();
set_value = set_value << m_bitShift;
if(i2c->writeWordReg(reg, swapWord(set_value)) != mraa::SUCCESS){
throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.write() failed");
return;
}
break;
case 5: //set default
default:
if(i2c->writeWordReg(ADS1X15_REG_POINTER_LOWTHRESH, 0x0080) != mraa::SUCCESS){
throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.write() failed");
return;
}
if(i2c->writeWordReg(ADS1X15_REG_POINTER_HITHRESH, 0xF07F) != mraa::SUCCESS){
throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.write() failed");
return;
}
break;
}
}
//Private functions
void
ADS1X15::getCurrentConfig(){
m_config_reg = i2c->readWordReg(ADS1X15_REG_POINTER_CONFIG);
m_config_reg = swapWord(m_config_reg);
setDelay();
}
void
ADS1X15::updateConfigRegister(uint16_t update, bool read){
uint16_t temp = update;
//Mask out read bit if we are just updating the configuration.
if(!read) temp = update & 0x7FFF;
if(i2c->writeWordReg(ADS1X15_REG_POINTER_CONFIG, swapWord(temp)) != mraa::SUCCESS){
throw std::invalid_argument(std::string(__FUNCTION__) + ": I2c.write() failed");
return;
}
//If we update the configuration re-set the in memory copy.
if(!read) getCurrentConfig();
}
uint16_t
ADS1X15::swapWord(uint16_t value){
uint16_t res = value;
return ((res & 0xFF) << 8) | ((res >> 8 ) & 0xFF);
}
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