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Ads1015.cpp
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#include "Ads1015.h"
#include <Wire.h>
#define ADS_I2C_ADDRESS 0x48
/*=========================================================================
CONVERSION DELAY (in mS)
-----------------------------------------------------------------------*/
//#define ADS1015_CONVERSIONDELAY (1)
#define ADS1115_CONVERSIONDELAY (8)
/*=========================================================================*/
/*=========================================================================
POINTER REGISTER
-----------------------------------------------------------------------*/
#define ADS1015_REG_POINTER_MASK (0x03)
#define ADS1015_REG_POINTER_CONVERT (0x00)
#define ADS1015_REG_POINTER_CONFIG (0x01)
#define ADS1015_REG_POINTER_LOWTHRESH (0x02)
#define ADS1015_REG_POINTER_HITHRESH (0x03)
/*=========================================================================*/
/*=========================================================================
CONFIG REGISTER
-----------------------------------------------------------------------*/
#define ADS1015_REG_CONFIG_OS_MASK (0x8000)
#define ADS1015_REG_CONFIG_OS_SINGLE (0x8000) // Write: Set to start a single-conversion
#define ADS1015_REG_CONFIG_OS_BUSY (0x0000) // Read: Bit = 0 when conversion is in progress
#define ADS1015_REG_CONFIG_OS_NOTBUSY (0x8000) // Read: Bit = 1 when device is not performing a conversion
#define ADS1015_REG_CONFIG_MUX_MASK (0x7000)
#define ADS1015_REG_CONFIG_MUX_DIFF_0_1 (0x0000) // Differential P = AIN0, N = AIN1 (default)
#define ADS1015_REG_CONFIG_MUX_DIFF_0_3 (0x1000) // Differential P = AIN0, N = AIN3
#define ADS1015_REG_CONFIG_MUX_DIFF_1_3 (0x2000) // Differential P = AIN1, N = AIN3
#define ADS1015_REG_CONFIG_MUX_DIFF_2_3 (0x3000) // Differential P = AIN2, N = AIN3
#define ADS1015_REG_CONFIG_MUX_SINGLE_0 (0x4000) // Single-ended AIN0
#define ADS1015_REG_CONFIG_MUX_SINGLE_1 (0x5000) // Single-ended AIN1
#define ADS1015_REG_CONFIG_MUX_SINGLE_2 (0x6000) // Single-ended AIN2
#define ADS1015_REG_CONFIG_MUX_SINGLE_3 (0x7000) // Single-ended AIN3
#define ADS1015_REG_CONFIG_PGA_MASK (0x0E00)
#define ADS1015_REG_CONFIG_PGA_6_144V (0x0000) // +/-6.144V range = Gain 2/3
#define ADS1015_REG_CONFIG_PGA_4_096V (0x0200) // +/-4.096V range = Gain 1
#define ADS1015_REG_CONFIG_PGA_2_048V (0x0400) // +/-2.048V range = Gain 2 (default)
#define ADS1015_REG_CONFIG_PGA_1_024V (0x0600) // +/-1.024V range = Gain 4
#define ADS1015_REG_CONFIG_PGA_0_512V (0x0800) // +/-0.512V range = Gain 8
#define ADS1015_REG_CONFIG_PGA_0_256V (0x0A00) // +/-0.256V range = Gain 16
#define ADS1015_REG_CONFIG_MODE_MASK (0x0100)
#define ADS1015_REG_CONFIG_MODE_CONTIN (0x0000) // Continuous conversion mode
#define ADS1015_REG_CONFIG_MODE_SINGLE (0x0100) // Power-down single-shot mode (default)
#define ADS1015_REG_CONFIG_DR_MASK (0x00E0)
#define ADS1015_REG_CONFIG_DR_128SPS (0x0000) // 128 samples per second
#define ADS1015_REG_CONFIG_DR_250SPS (0x0020) // 250 samples per second
#define ADS1015_REG_CONFIG_DR_490SPS (0x0040) // 490 samples per second
#define ADS1015_REG_CONFIG_DR_920SPS (0x0060) // 920 samples per second
#define ADS1015_REG_CONFIG_DR_1600SPS (0x0080) // 1600 samples per second (default)
#define ADS1015_REG_CONFIG_DR_2400SPS (0x00A0) // 2400 samples per second
#define ADS1015_REG_CONFIG_DR_3300SPS (0x00C0) // 3300 samples per second
#define ADS1015_REG_CONFIG_CMODE_MASK (0x0010)
#define ADS1015_REG_CONFIG_CMODE_TRAD (0x0000) // Traditional comparator with hysteresis (default)
#define ADS1015_REG_CONFIG_CMODE_WINDOW (0x0010) // Window comparator
#define ADS1015_REG_CONFIG_CPOL_MASK (0x0008)
#define ADS1015_REG_CONFIG_CPOL_ACTVLOW (0x0000) // ALERT/RDY pin is low when active (default)
#define ADS1015_REG_CONFIG_CPOL_ACTVHI (0x0008) // ALERT/RDY pin is high when active
#define ADS1015_REG_CONFIG_CLAT_MASK (0x0004) // Determines if ALERT/RDY pin latches once asserted
#define ADS1015_REG_CONFIG_CLAT_NONLAT (0x0000) // Non-latching comparator (default)
#define ADS1015_REG_CONFIG_CLAT_LATCH (0x0004) // Latching comparator
#define ADS1015_REG_CONFIG_CQUE_MASK (0x0003)
#define ADS1015_REG_CONFIG_CQUE_1CONV (0x0000) // Assert ALERT/RDY after one conversions
#define ADS1015_REG_CONFIG_CQUE_2CONV (0x0001) // Assert ALERT/RDY after two conversions
#define ADS1015_REG_CONFIG_CQUE_4CONV (0x0002) // Assert ALERT/RDY after four conversions
#define ADS1015_REG_CONFIG_CQUE_NONE (0x0003) // Disable the comparator and put ALERT/RDY in high state (default)
/*=========================================================================*/
typedef enum
{
GAIN_TWOTHIRDS = ADS1015_REG_CONFIG_PGA_6_144V,
GAIN_ONE = ADS1015_REG_CONFIG_PGA_4_096V,
GAIN_TWO = ADS1015_REG_CONFIG_PGA_2_048V,
GAIN_FOUR = ADS1015_REG_CONFIG_PGA_1_024V,
GAIN_EIGHT = ADS1015_REG_CONFIG_PGA_0_512V,
GAIN_SIXTEEN = ADS1015_REG_CONFIG_PGA_0_256V
} adsGain_t;
void Ads1015::ReadADC(unsigned int *aAdcValues, byte aCount)
{
// read the analog values:
for(byte i=0; i<aCount; i++)
{
//aAdcValues[i] = GetAdc(i);
aAdcValues[i] = readADC_SingleEnded(i);
}
}
float Ads1015::GetAdc(byte aChannel)
{
unsigned int lValue = 0;
lValue = readADC_SingleEnded(aChannel);
float lV = lValue;
lV = lV * cAdcRange;
return lV;
}
/**************************************************************************/
/*!
@brief Writes 16-bits to the specified destination register
*/
/**************************************************************************/
void Ads1015::writeAdcRegister(uint8_t reg, uint16_t value)
{
Wire.beginTransmission(ADS_I2C_ADDRESS);
Wire.write(reg);
Wire.write((uint8_t)(value>>8));
Wire.write((uint8_t)(value & 0xFF));
Wire.endTransmission();
}
/**************************************************************************/
/*!
@brief Writes 16-bits to the specified destination register
*/
/**************************************************************************/
uint16_t Ads1015::readAdcRegister(uint8_t reg)
{
Wire.beginTransmission(ADS_I2C_ADDRESS);
Wire.write(reg);
Wire.endTransmission();
Wire.requestFrom(ADS_I2C_ADDRESS, 2);
return ((Wire.read() << 8) | Wire.read());
}
/**************************************************************************/
/*!
@brief Gets a single-ended ADC reading from the specified channel
*/
/**************************************************************************/
uint16_t Ads1015::readADC_SingleEnded(uint8_t channel)
{
if (channel > 3)
{
return 0;
}
// Start with default values
uint16_t config = ADS1015_REG_CONFIG_CQUE_NONE | // Disable the comparator (default val)
ADS1015_REG_CONFIG_CLAT_NONLAT | // Non-latching (default val)
ADS1015_REG_CONFIG_CPOL_ACTVLOW | // Alert/Rdy active low (default val)
ADS1015_REG_CONFIG_CMODE_TRAD | // Traditional comparator (default val)
ADS1015_REG_CONFIG_DR_1600SPS | // samples per second
ADS1015_REG_CONFIG_MODE_SINGLE | // Single-shot mode (default)
ADS1015_REG_CONFIG_OS_SINGLE | // Set 'start single-conversion' bit
GAIN_ONE;
// Set single-ended input channel
switch (channel)
{
case (0):
config |= ADS1015_REG_CONFIG_MUX_SINGLE_0;
break;
case (1):
config |= ADS1015_REG_CONFIG_MUX_SINGLE_1;
break;
case (2):
config |= ADS1015_REG_CONFIG_MUX_SINGLE_2;
break;
case (3):
config |= ADS1015_REG_CONFIG_MUX_SINGLE_3;
break;
}
// Write config register to the ADC
writeAdcRegister(ADS1015_REG_POINTER_CONFIG, config);
// Wait for the conversion to complete
delay(ADS1115_CONVERSIONDELAY);
// Read the conversion results
return readAdcRegister(ADS1015_REG_POINTER_CONVERT);
}