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Adafruit_ADS1X15.h
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/**************************************************************************/
/*!
@file Adafruit_ADS1X15.h
This is a library for the Adafruit ADS1X15 ADC breakout boards.
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Kevin "KTOWN" Townsend for Adafruit Industries.
BSD license, all text here must be included in any redistribution
*/
/**************************************************************************/
#ifndef __ADS1X15_H__
#define __ADS1X15_H__
#if defined(__linux__)
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#define delay(x) usleep(1000 * x)
#else
#include <Adafruit_I2CDevice.h>
#include <Arduino.h>
#include <Wire.h>
#endif
/*=========================================================================
I2C ADDRESS/BITS
-----------------------------------------------------------------------*/
#define ADS1X15_ADDRESS (0x48) ///< 1001 000 (ADDR = GND)
#if defined(__linux__)
#define ADS1X15_I2C_SLAVE (0x0703) // IIC SLAVE
#endif
/*=========================================================================*/
/*=========================================================================
POINTER REGISTER
-----------------------------------------------------------------------*/
#define ADS1X15_REG_POINTER_MASK (0x03) ///< Point mask
#define ADS1X15_REG_POINTER_CONVERT (0x00) ///< Conversion
#define ADS1X15_REG_POINTER_CONFIG (0x01) ///< Configuration
#define ADS1X15_REG_POINTER_LOWTHRESH (0x02) ///< Low threshold
#define ADS1X15_REG_POINTER_HITHRESH (0x03) ///< High threshold
/*=========================================================================*/
/*=========================================================================
CONFIG REGISTER
-----------------------------------------------------------------------*/
#define ADS1X15_REG_CONFIG_OS_MASK (0x8000) ///< OS Mask
#define ADS1X15_REG_CONFIG_OS_SINGLE \
(0x8000) ///< Write: Set to start a single-conversion
#define ADS1X15_REG_CONFIG_OS_BUSY \
(0x0000) ///< Read: Bit = 0 when conversion is in progress
#define ADS1X15_REG_CONFIG_OS_NOTBUSY \
(0x8000) ///< Read: Bit = 1 when device is not performing a conversion
#define ADS1X15_REG_CONFIG_MUX_MASK (0x7000) ///< Mux Mask
#define ADS1X15_REG_CONFIG_MUX_DIFF_0_1 \
(0x0000) ///< Differential P = AIN0, N = AIN1 (default)
#define ADS1X15_REG_CONFIG_MUX_DIFF_0_3 \
(0x1000) ///< Differential P = AIN0, N = AIN3
#define ADS1X15_REG_CONFIG_MUX_DIFF_1_3 \
(0x2000) ///< Differential P = AIN1, N = AIN3
#define ADS1X15_REG_CONFIG_MUX_DIFF_2_3 \
(0x3000) ///< Differential P = AIN2, N = AIN3
#define ADS1X15_REG_CONFIG_MUX_SINGLE_0 (0x4000) ///< Single-ended AIN0
#define ADS1X15_REG_CONFIG_MUX_SINGLE_1 (0x5000) ///< Single-ended AIN1
#define ADS1X15_REG_CONFIG_MUX_SINGLE_2 (0x6000) ///< Single-ended AIN2
#define ADS1X15_REG_CONFIG_MUX_SINGLE_3 (0x7000) ///< Single-ended AIN3
constexpr uint16_t MUX_BY_CHANNEL[] = {
ADS1X15_REG_CONFIG_MUX_SINGLE_0, ///< Single-ended AIN0
ADS1X15_REG_CONFIG_MUX_SINGLE_1, ///< Single-ended AIN1
ADS1X15_REG_CONFIG_MUX_SINGLE_2, ///< Single-ended AIN2
ADS1X15_REG_CONFIG_MUX_SINGLE_3 ///< Single-ended AIN3
}; ///< MUX config by channel
#define ADS1X15_REG_CONFIG_PGA_MASK (0x0E00) ///< PGA Mask
#define ADS1X15_REG_CONFIG_PGA_6_144V (0x0000) ///< +/-6.144V range = Gain 2/3
#define ADS1X15_REG_CONFIG_PGA_4_096V (0x0200) ///< +/-4.096V range = Gain 1
#define ADS1X15_REG_CONFIG_PGA_2_048V \
(0x0400) ///< +/-2.048V range = Gain 2 (default)
#define ADS1X15_REG_CONFIG_PGA_1_024V (0x0600) ///< +/-1.024V range = Gain 4
#define ADS1X15_REG_CONFIG_PGA_0_512V (0x0800) ///< +/-0.512V range = Gain 8
#define ADS1X15_REG_CONFIG_PGA_0_256V (0x0A00) ///< +/-0.256V range = Gain 16
#define ADS1X15_REG_CONFIG_MODE_MASK (0x0100) ///< Mode Mask
#define ADS1X15_REG_CONFIG_MODE_CONTIN (0x0000) ///< Continuous conversion mode
#define ADS1X15_REG_CONFIG_MODE_SINGLE \
(0x0100) ///< Power-down single-shot mode (default)
#define ADS1X15_REG_CONFIG_RATE_MASK (0x00E0) ///< Data Rate Mask
#define ADS1X15_REG_CONFIG_CMODE_MASK (0x0010) ///< CMode Mask
#define ADS1X15_REG_CONFIG_CMODE_TRAD \
(0x0000) ///< Traditional comparator with hysteresis (default)
#define ADS1X15_REG_CONFIG_CMODE_WINDOW (0x0010) ///< Window comparator
#define ADS1X15_REG_CONFIG_CPOL_MASK (0x0008) ///< CPol Mask
#define ADS1X15_REG_CONFIG_CPOL_ACTVLOW \
(0x0000) ///< ALERT/RDY pin is low when active (default)
#define ADS1X15_REG_CONFIG_CPOL_ACTVHI \
(0x0008) ///< ALERT/RDY pin is high when active
#define ADS1X15_REG_CONFIG_CLAT_MASK \
(0x0004) ///< Determines if ALERT/RDY pin latches once asserted
#define ADS1X15_REG_CONFIG_CLAT_NONLAT \
(0x0000) ///< Non-latching comparator (default)
#define ADS1X15_REG_CONFIG_CLAT_LATCH (0x0004) ///< Latching comparator
#define ADS1X15_REG_CONFIG_CQUE_MASK (0x0003) ///< CQue Mask
#define ADS1X15_REG_CONFIG_CQUE_1CONV \
(0x0000) ///< Assert ALERT/RDY after one conversions
#define ADS1X15_REG_CONFIG_CQUE_2CONV \
(0x0001) ///< Assert ALERT/RDY after two conversions
#define ADS1X15_REG_CONFIG_CQUE_4CONV \
(0x0002) ///< Assert ALERT/RDY after four conversions
#define ADS1X15_REG_CONFIG_CQUE_NONE \
(0x0003) ///< Disable the comparator and put ALERT/RDY in high state (default)
/*=========================================================================*/
/** Gain settings */
typedef enum {
GAIN_TWOTHIRDS = ADS1X15_REG_CONFIG_PGA_6_144V,
GAIN_ONE = ADS1X15_REG_CONFIG_PGA_4_096V,
GAIN_TWO = ADS1X15_REG_CONFIG_PGA_2_048V,
GAIN_FOUR = ADS1X15_REG_CONFIG_PGA_1_024V,
GAIN_EIGHT = ADS1X15_REG_CONFIG_PGA_0_512V,
GAIN_SIXTEEN = ADS1X15_REG_CONFIG_PGA_0_256V
} adsGain_t;
/** Data rates */
#define RATE_ADS1015_128SPS (0x0000) ///< 128 samples per second
#define RATE_ADS1015_250SPS (0x0020) ///< 250 samples per second
#define RATE_ADS1015_490SPS (0x0040) ///< 490 samples per second
#define RATE_ADS1015_920SPS (0x0060) ///< 920 samples per second
#define RATE_ADS1015_1600SPS (0x0080) ///< 1600 samples per second (default)
#define RATE_ADS1015_2400SPS (0x00A0) ///< 2400 samples per second
#define RATE_ADS1015_3300SPS (0x00C0) ///< 3300 samples per second
#define RATE_ADS1115_8SPS (0x0000) ///< 8 samples per second
#define RATE_ADS1115_16SPS (0x0020) ///< 16 samples per second
#define RATE_ADS1115_32SPS (0x0040) ///< 32 samples per second
#define RATE_ADS1115_64SPS (0x0060) ///< 64 samples per second
#define RATE_ADS1115_128SPS (0x0080) ///< 128 samples per second (default)
#define RATE_ADS1115_250SPS (0x00A0) ///< 250 samples per second
#define RATE_ADS1115_475SPS (0x00C0) ///< 475 samples per second
#define RATE_ADS1115_860SPS (0x00E0) ///< 860 samples per second
/**************************************************************************/
/*!
@brief Sensor driver for the Adafruit ADS1X15 ADC breakouts.
*/
/**************************************************************************/
class Adafruit_ADS1X15 {
protected:
// Instance-specific properties
#if defined(__linux__)
int fd;
#else
Adafruit_I2CDevice *m_i2c_dev; ///< I2C bus device
#endif
uint8_t m_bitShift; ///< bit shift amount
adsGain_t m_gain; ///< ADC gain
uint16_t m_dataRate; ///< Data rate
public:
#if defined(__linux__)
bool begin(uint8_t i2c_addr = ADS1X15_ADDRESS, int id = 0);
#else
bool begin(uint8_t i2c_addr = ADS1X15_ADDRESS, TwoWire *wire = &Wire);
#endif
int16_t readADC_SingleEnded(uint8_t channel);
int16_t readADC_Differential_0_1();
int16_t readADC_Differential_0_3();
int16_t readADC_Differential_1_3();
int16_t readADC_Differential_2_3();
void startComparator_SingleEnded(uint8_t channel, int16_t threshold);
int16_t getLastConversionResults();
float computeVolts(int16_t counts);
void setGain(adsGain_t gain);
adsGain_t getGain();
void setDataRate(uint16_t rate);
uint16_t getDataRate();
void startADCReading(uint16_t mux, bool continuous);
bool conversionComplete();
private:
void writeRegister(uint8_t reg, uint16_t value);
uint16_t readRegister(uint8_t reg);
uint8_t buffer[3];
};
/**************************************************************************/
/*!
@brief Sensor driver for the Adafruit ADS1015 ADC breakout.
*/
/**************************************************************************/
class Adafruit_ADS1015 : public Adafruit_ADS1X15 {
public:
Adafruit_ADS1015();
};
/**************************************************************************/
/*!
@brief Sensor driver for the Adafruit ADS1115 ADC breakout.
*/
/**************************************************************************/
class Adafruit_ADS1115 : public Adafruit_ADS1X15 {
public:
Adafruit_ADS1115();
};
#endif