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adc.h
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adc.h
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/*
* adc.h
*
* Created on: Feb 21, 2019
* Author: TritonCubed
*
* ADS1115 Adafruit breakout lib ported from
* the Arduino version. Can use several optimizations,
* but why bother?
*
* The breakout uses the following pins:
*
* RPI Chip
* --------------------
* Pin 1 (3v3) 3.3v
* Pin 6 (GND) GND
* Pin 5 (SCL) SCL
* Pin 3 (SDA) SDA
*/
/*=========================================================================
I2C ADDRESS/BITS
-----------------------------------------------------------------------*/
#define ADS1015_ADDRESS (0x48) // 1001 000 (ADDR = GND)
/*=========================================================================*/
/*=========================================================================
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)
/*=========================================================================*/
#include <stdint.h>
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;
typedef struct {
// Instance-specific properties
uint8_t m_i2cAddress;
uint8_t m_conversionDelay;
uint8_t m_bitShift;
adsGain_t m_gain;
} ADC;
/*
* Initializes the ADC. Make sure I2C is running.
*/
void ADC_init( ADC* adc, adsGain_t gain );
/*
* Gets a single-ended ADC reading from the specified channel
*/
uint16_t readADC_SingleEnded( ADC* adc, uint8_t channel );
/*
* Reads the conversion results, measuring the voltage
* difference between the P (AIN0) and N (AIN1) input. Generates
* a signed value since the difference can be either
* positive or negative.
*/
int16_t readADC_Differential_0_1( ADC* adc );
/*
* Reads the conversion results, measuring the voltage
* difference between the P (AIN2) and N (AIN3) input. Generates
* a signed value since the difference can be either
* positive or negative.
*/
int16_t readADC_Differential_2_3( ADC* adc );
/*
* Sets up the comparator to operate in basic mode, causing the
* ALERT/RDY pin to assert (go from high to low) when the ADC
* value exceeds the specified threshold.
*
* This will also set the ADC in continuous conversion mode.
*/
void startComparator_SingleEnded( ADC* adc, uint8_t channel, int16_t threshold );
/*
* In order to clear the comparator, we need to read the
* conversion results. This function reads the last conversion
* results without changing the config value.
*/
int16_t getLastConversionResults( ADC* adc );
/*
* Sets the gain and input voltage range
*/
void setGain( ADC* adc, adsGain_t gain );
/*
* Gets the gain and input voltage range
*/
adsGain_t getGain( ADC* adc );