Arve Seljebu / ADS1015

A library for ADS1015 and ADS1115 from Texas Instruments.

Dependents:   IGGE_Power ADS1015-hello_world ADS1115-hello_world frdm_rtos_Eth ... more

Use like this

#include "mbed.h"
#include "Adafruit_ADS1015.h"
#include "USBSerial.h"

#define SERIAL_BAUD_RATE    9600

I2C i2c(p23, p18);
Adafruit_ADS1015 ads(&i2c);
USBSerial pc; // USB CDC serial port

 
int main() {
    uint16_t reading;
    while (1) {
        reading = ads.readADC_SingleEnded(0); // read channel 0
        pc.printf("reading: %d\r\n", reading); // print reading    
        wait(2); // loop 2 sek
    }
}

Library ported from Arduino at github repository.

Breakout boards from Adafruit: http://learn.adafruit.com/adafruit-4-channel-adc-breakouts/overview

GitHub repository: https://github.com/adafruit/Adafruit_ADS1X15

Adafruit_ADS1015.h@5:aa277517f0ad, 2014-10-11 (annotated)

Committer:
arve0
Date:
Sat Oct 11 08:45:17 2014 +0000
Revision:
5:aa277517f0ad
Parent:
4:6445a678d458 
ads1115 comments

Who changed what in which revision?

UserRevisionLine numberNew contents of line
arve0 0:8174d9ceeca1 1 /**************************************************************************/
arve0 0:8174d9ceeca1 2 /*!
arve0 0:8174d9ceeca1 3 @file Adafruit_ADS1015.h
arve0 0:8174d9ceeca1 4 @author K. Townsend (Adafruit Industries)
arve0 0:8174d9ceeca1 5 @license BSD (see LICENSE.txt)
arve0 0:8174d9ceeca1 6
arve0 0:8174d9ceeca1 7 Ported to mbed by Arve Seljebu - arve0.github.io
arve0 0:8174d9ceeca1 8
arve0 0:8174d9ceeca1 9 This is a library for the Adafruit ADS1015 breakout board
arve0 0:8174d9ceeca1 10 ----> https://www.adafruit.com/products/1083
arve0 0:8174d9ceeca1 11
arve0 0:8174d9ceeca1 12 Adafruit invests time and resources providing this open source code,
arve0 0:8174d9ceeca1 13 please support Adafruit and open-source hardware by purchasing
arve0 0:8174d9ceeca1 14 products from Adafruit!
arve0 0:8174d9ceeca1 15
arve0 0:8174d9ceeca1 16 @section HISTORY
arve0 0:8174d9ceeca1 17
arve0 0:8174d9ceeca1 18 v1.0 - First release
arve0 0:8174d9ceeca1 19 v1.1 - Added ADS1115 support - W. Earl
arve0 0:8174d9ceeca1 20 v1.1.1 - Ported to mbed - Arve Seljebu
arve0 0:8174d9ceeca1 21 */
arve0 0:8174d9ceeca1 22 /**************************************************************************/
arve0 0:8174d9ceeca1 23
arve0 0:8174d9ceeca1 24 #include <mbed.h>
arve0 0:8174d9ceeca1 25
arve0 0:8174d9ceeca1 26 /*=========================================================================
arve0 0:8174d9ceeca1 27 I2C ADDRESS/BITS
arve0 0:8174d9ceeca1 28 -----------------------------------------------------------------------*/
arve0 0:8174d9ceeca1 29 #define ADS1015_ADDRESS (0x48) // 1001 000 (ADDR = GND)
arve0 0:8174d9ceeca1 30 /*=========================================================================*/
arve0 0:8174d9ceeca1 31
arve0 0:8174d9ceeca1 32 /*=========================================================================
arve0 0:8174d9ceeca1 33 CONVERSION DELAY (in mS)
arve0 0:8174d9ceeca1 34 -----------------------------------------------------------------------*/
arve0 0:8174d9ceeca1 35 #define ADS1015_CONVERSIONDELAY (1)
arve0 0:8174d9ceeca1 36 #define ADS1115_CONVERSIONDELAY (8)
arve0 0:8174d9ceeca1 37 /*=========================================================================*/
arve0 0:8174d9ceeca1 38
arve0 0:8174d9ceeca1 39 /*=========================================================================
arve0 0:8174d9ceeca1 40 POINTER REGISTER
arve0 0:8174d9ceeca1 41 -----------------------------------------------------------------------*/
arve0 0:8174d9ceeca1 42 #define ADS1015_REG_POINTER_MASK (0x03)
arve0 0:8174d9ceeca1 43 #define ADS1015_REG_POINTER_CONVERT (0x00)
arve0 0:8174d9ceeca1 44 #define ADS1015_REG_POINTER_CONFIG (0x01)
arve0 0:8174d9ceeca1 45 #define ADS1015_REG_POINTER_LOWTHRESH (0x02)
arve0 0:8174d9ceeca1 46 #define ADS1015_REG_POINTER_HITHRESH (0x03)
arve0 0:8174d9ceeca1 47 /*=========================================================================*/
arve0 0:8174d9ceeca1 48
arve0 0:8174d9ceeca1 49 /*=========================================================================
arve0 0:8174d9ceeca1 50 CONFIG REGISTER
arve0 0:8174d9ceeca1 51 -----------------------------------------------------------------------*/
arve0 0:8174d9ceeca1 52 #define ADS1015_REG_CONFIG_OS_MASK (0x8000)
arve0 0:8174d9ceeca1 53 #define ADS1015_REG_CONFIG_OS_SINGLE (0x8000) // Write: Set to start a single-conversion
arve0 0:8174d9ceeca1 54 #define ADS1015_REG_CONFIG_OS_BUSY (0x0000) // Read: Bit = 0 when conversion is in progress
arve0 0:8174d9ceeca1 55 #define ADS1015_REG_CONFIG_OS_NOTBUSY (0x8000) // Read: Bit = 1 when device is not performing a conversion
arve0 0:8174d9ceeca1 56
arve0 0:8174d9ceeca1 57 #define ADS1015_REG_CONFIG_MUX_MASK (0x7000)
arve0 0:8174d9ceeca1 58 #define ADS1015_REG_CONFIG_MUX_DIFF_0_1 (0x0000) // Differential P = AIN0, N = AIN1 (default)
arve0 0:8174d9ceeca1 59 #define ADS1015_REG_CONFIG_MUX_DIFF_0_3 (0x1000) // Differential P = AIN0, N = AIN3
arve0 0:8174d9ceeca1 60 #define ADS1015_REG_CONFIG_MUX_DIFF_1_3 (0x2000) // Differential P = AIN1, N = AIN3
arve0 0:8174d9ceeca1 61 #define ADS1015_REG_CONFIG_MUX_DIFF_2_3 (0x3000) // Differential P = AIN2, N = AIN3
arve0 0:8174d9ceeca1 62 #define ADS1015_REG_CONFIG_MUX_SINGLE_0 (0x4000) // Single-ended AIN0
arve0 0:8174d9ceeca1 63 #define ADS1015_REG_CONFIG_MUX_SINGLE_1 (0x5000) // Single-ended AIN1
arve0 0:8174d9ceeca1 64 #define ADS1015_REG_CONFIG_MUX_SINGLE_2 (0x6000) // Single-ended AIN2
arve0 0:8174d9ceeca1 65 #define ADS1015_REG_CONFIG_MUX_SINGLE_3 (0x7000) // Single-ended AIN3
arve0 0:8174d9ceeca1 66
arve0 0:8174d9ceeca1 67 #define ADS1015_REG_CONFIG_PGA_MASK (0x0E00)
arve0 0:8174d9ceeca1 68 #define ADS1015_REG_CONFIG_PGA_6_144V (0x0000) // +/-6.144V range = Gain 2/3
arve0 0:8174d9ceeca1 69 #define ADS1015_REG_CONFIG_PGA_4_096V (0x0200) // +/-4.096V range = Gain 1
arve0 0:8174d9ceeca1 70 #define ADS1015_REG_CONFIG_PGA_2_048V (0x0400) // +/-2.048V range = Gain 2 (default)
arve0 0:8174d9ceeca1 71 #define ADS1015_REG_CONFIG_PGA_1_024V (0x0600) // +/-1.024V range = Gain 4
arve0 0:8174d9ceeca1 72 #define ADS1015_REG_CONFIG_PGA_0_512V (0x0800) // +/-0.512V range = Gain 8
arve0 0:8174d9ceeca1 73 #define ADS1015_REG_CONFIG_PGA_0_256V (0x0A00) // +/-0.256V range = Gain 16
arve0 0:8174d9ceeca1 74
arve0 0:8174d9ceeca1 75 #define ADS1015_REG_CONFIG_MODE_MASK (0x0100)
arve0 0:8174d9ceeca1 76 #define ADS1015_REG_CONFIG_MODE_CONTIN (0x0000) // Continuous conversion mode
arve0 0:8174d9ceeca1 77 #define ADS1015_REG_CONFIG_MODE_SINGLE (0x0100) // Power-down single-shot mode (default)
arve0 0:8174d9ceeca1 78
arve0 0:8174d9ceeca1 79 #define ADS1015_REG_CONFIG_DR_MASK (0x00E0)
arve0 3:fb735fb343de 80 #define ADS1015_REG_CONFIG_DR_128SPS (0x0000) // 128 samples per second - ADS1115 8SPS
arve0 3:fb735fb343de 81 #define ADS1015_REG_CONFIG_DR_250SPS (0x0020) // 250 samples per second - ADS1115 16SPS
arve0 3:fb735fb343de 82 #define ADS1015_REG_CONFIG_DR_490SPS (0x0040) // 490 samples per second - ADS1115 32SPS
arve0 3:fb735fb343de 83 #define ADS1015_REG_CONFIG_DR_920SPS (0x0060) // 920 samples per second - ADS1115 64SPS
arve0 3:fb735fb343de 84 #define ADS1015_REG_CONFIG_DR_1600SPS (0x0080) // 1600 samples per second - ADS1115 250SPS (default)
arve0 3:fb735fb343de 85 #define ADS1015_REG_CONFIG_DR_2400SPS (0x00A0) // 2400 samples per second - ADS1115 475SPS
arve0 3:fb735fb343de 86 #define ADS1015_REG_CONFIG_DR_3300SPS (0x00C0) // 3300 samples per second - ADS1115 860SPS
arve0 0:8174d9ceeca1 87
arve0 0:8174d9ceeca1 88 #define ADS1015_REG_CONFIG_CMODE_MASK (0x0010)
arve0 0:8174d9ceeca1 89 #define ADS1015_REG_CONFIG_CMODE_TRAD (0x0000) // Traditional comparator with hysteresis (default)
arve0 0:8174d9ceeca1 90 #define ADS1015_REG_CONFIG_CMODE_WINDOW (0x0010) // Window comparator
arve0 0:8174d9ceeca1 91
arve0 0:8174d9ceeca1 92 #define ADS1015_REG_CONFIG_CPOL_MASK (0x0008)
arve0 0:8174d9ceeca1 93 #define ADS1015_REG_CONFIG_CPOL_ACTVLOW (0x0000) // ALERT/RDY pin is low when active (default)
arve0 0:8174d9ceeca1 94 #define ADS1015_REG_CONFIG_CPOL_ACTVHI (0x0008) // ALERT/RDY pin is high when active
arve0 0:8174d9ceeca1 95
arve0 0:8174d9ceeca1 96 #define ADS1015_REG_CONFIG_CLAT_MASK (0x0004) // Determines if ALERT/RDY pin latches once asserted
arve0 0:8174d9ceeca1 97 #define ADS1015_REG_CONFIG_CLAT_NONLAT (0x0000) // Non-latching comparator (default)
arve0 0:8174d9ceeca1 98 #define ADS1015_REG_CONFIG_CLAT_LATCH (0x0004) // Latching comparator
arve0 0:8174d9ceeca1 99
arve0 0:8174d9ceeca1 100 #define ADS1015_REG_CONFIG_CQUE_MASK (0x0003)
arve0 0:8174d9ceeca1 101 #define ADS1015_REG_CONFIG_CQUE_1CONV (0x0000) // Assert ALERT/RDY after one conversions
arve0 0:8174d9ceeca1 102 #define ADS1015_REG_CONFIG_CQUE_2CONV (0x0001) // Assert ALERT/RDY after two conversions
arve0 0:8174d9ceeca1 103 #define ADS1015_REG_CONFIG_CQUE_4CONV (0x0002) // Assert ALERT/RDY after four conversions
arve0 0:8174d9ceeca1 104 #define ADS1015_REG_CONFIG_CQUE_NONE (0x0003) // Disable the comparator and put ALERT/RDY in high state (default)
arve0 0:8174d9ceeca1 105 /*=========================================================================*/
arve0 0:8174d9ceeca1 106
arve0 2:d864e21d4e58 107 typedef enum {
arve0 2:d864e21d4e58 108 GAIN_TWOTHIRDS = ADS1015_REG_CONFIG_PGA_6_144V,
arve0 2:d864e21d4e58 109 GAIN_ONE = ADS1015_REG_CONFIG_PGA_4_096V,
arve0 2:d864e21d4e58 110 GAIN_TWO = ADS1015_REG_CONFIG_PGA_2_048V,
arve0 2:d864e21d4e58 111 GAIN_FOUR = ADS1015_REG_CONFIG_PGA_1_024V,
arve0 2:d864e21d4e58 112 GAIN_EIGHT = ADS1015_REG_CONFIG_PGA_0_512V,
arve0 2:d864e21d4e58 113 GAIN_SIXTEEN = ADS1015_REG_CONFIG_PGA_0_256V
arve0 0:8174d9ceeca1 114 } adsGain_t;
arve0 0:8174d9ceeca1 115
arve0 0:8174d9ceeca1 116 class Adafruit_ADS1015
arve0 0:8174d9ceeca1 117 {
arve0 0:8174d9ceeca1 118 protected:
arve0 2:d864e21d4e58 119 // Instance-specific properties
arve0 2:d864e21d4e58 120 uint8_t m_i2cAddress;
arve0 2:d864e21d4e58 121 uint8_t m_conversionDelay;
arve0 2:d864e21d4e58 122 uint8_t m_bitShift;
arve0 2:d864e21d4e58 123 adsGain_t m_gain;
arve0 2:d864e21d4e58 124 I2C* m_i2c;
arve0 2:d864e21d4e58 125
arve0 0:8174d9ceeca1 126
arve0 2:d864e21d4e58 127 public:
arve0 2:d864e21d4e58 128 Adafruit_ADS1015(I2C* i2c = 0, uint8_t i2cAddress = ADS1015_ADDRESS); // set i2c adress = 0 to allow ADS1115 to use this as default constructor
arve0 2:d864e21d4e58 129 uint16_t readADC_SingleEnded(uint8_t channel);
arve0 2:d864e21d4e58 130 int16_t readADC_Differential_0_1(void);
arve0 2:d864e21d4e58 131 int16_t readADC_Differential_2_3(void);
arve0 2:d864e21d4e58 132 void startComparator_SingleEnded(uint8_t channel, int16_t threshold);
arve0 2:d864e21d4e58 133 int16_t getLastConversionResults();
arve0 2:d864e21d4e58 134 void setGain(adsGain_t gain);
arve0 2:d864e21d4e58 135 adsGain_t getGain(void);
arve0 0:8174d9ceeca1 136
arve0 2:d864e21d4e58 137 private:
arve0 2:d864e21d4e58 138 uint16_t readRegister(uint8_t i2cAddress, uint8_t reg);
arve0 2:d864e21d4e58 139 void writeRegister(uint8_t i2cAddress, uint8_t reg, uint16_t value);
arve0 0:8174d9ceeca1 140 };
arve0 0:8174d9ceeca1 141
arve0 0:8174d9ceeca1 142 // Derive from ADS1105 & override construction to set properties
arve0 0:8174d9ceeca1 143 class Adafruit_ADS1115 : public Adafruit_ADS1015
arve0 0:8174d9ceeca1 144 {
arve0 2:d864e21d4e58 145 public:
arve0 2:d864e21d4e58 146 Adafruit_ADS1115(I2C* i2c, uint8_t i2cAddress = ADS1015_ADDRESS);
arve0 0:8174d9ceeca1 147
arve0 2:d864e21d4e58 148 private:
arve0 0:8174d9ceeca1 149 };