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

Files at this revision

API Documentation at this revision

Comitter:
arve0
Date:
Sat Oct 11 08:45:17 2014 +0000
Parent:
4:6445a678d458
Commit message:
ads1115 comments

Changed in this revision

Adafruit_ADS1015.cpp.orig Show diff for this revision Revisions of this file
diff -r 6445a678d458 -r aa277517f0ad Adafruit_ADS1015.cpp.orig
--- a/Adafruit_ADS1015.cpp.orig	Sat Oct 11 08:44:20 2014 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,326 +0,0 @@
-/**************************************************************************/
-/*!
-    @file     Adafruit_ADS1015.cpp
-    @author   K.Townsend (Adafruit Industries)
-    @license  BSD (see LICENSE.txt)
-
-    Ported to mbed by Arve Seljebu - arve0.github.io
-
-    Driver for the ADS1015/ADS1115 ADC
-
-    This is a library for the Adafruit MPL115A2 breakout
-    ----> https://www.adafruit.com/products/1083
-
-    Adafruit invests time and resources providing this open source code,
-    please support Adafruit and open-source hardware by purchasing
-    products from Adafruit!
-
-    @section  HISTORY
-
-    v1.0 - First release
-    v1.1.1 - Ported to mbed
-*/
-/**************************************************************************/
-
-#include <mbed.h>
-#include "Adafruit_ADS1015.h"
-
-/**************************************************************************/
-/*!
-    @brief  Writes 16-bits to the specified destination register
-*/
-/**************************************************************************/
-void Adafruit_ADS1015::writeRegister(uint8_t i2cAddress, uint8_t reg, uint16_t value)
-{
-    char cmd[3];
-    cmd[0] = (char)reg;
-    cmd[1] = (char)(value>>8);
-    cmd[2] = (char)(value & 0xFF);
-    m_i2c->write(i2cAddress, cmd, 3);
-}
-
-/**************************************************************************/
-/*!
-    @brief  Reads 16-bits from the specified register
-*/
-/**************************************************************************/
-uint16_t Adafruit_ADS1015::readRegister(uint8_t i2cAddress, uint8_t reg)
-{
-    char data[2];
-    data[0] = reg; // temporary use this to send address to conversion register
-    m_i2c->write(i2cAddress, data, 1);
-    m_i2c->read(i2cAddress, data, 2);
-    return (data[0] << 8 | data [1]);
-}
-
-/**************************************************************************/
-/*!
-    @brief  Instantiates a new ADS1015 class w/appropriate properties
-*/
-/**************************************************************************/
-Adafruit_ADS1015::Adafruit_ADS1015(I2C* i2c, uint8_t i2cAddress)
-{
-    // shift 7 bit address 1 left: read expects 8 bit address, see I2C.h
-    m_i2cAddress = i2cAddress << 1;
-    m_conversionDelay = ADS1015_CONVERSIONDELAY;
-    m_bitShift = 4;
-    m_gain = GAIN_TWOTHIRDS; /* +/- 6.144V range (limited to VDD +0.3V max!) */
-    m_i2c = i2c;
-}
-
-/**************************************************************************/
-/*!
-    @brief  Instantiates a new ADS1115 class w/appropriate properties
-*/
-/**************************************************************************/
-Adafruit_ADS1115::Adafruit_ADS1115(I2C* i2c, uint8_t i2cAddress)
-{
-    // shift 7 bit address 1 left: read expects 8 bit address, see mbed's I2C.h
-    m_i2cAddress = i2cAddress << 1;
-    m_conversionDelay = ADS1115_CONVERSIONDELAY;
-    m_bitShift = 0;
-    m_gain = GAIN_TWOTHIRDS; /* +/- 6.144V range (limited to VDD +0.3V max!) */
-    m_i2c = i2c;
-}
-
-/**************************************************************************/
-/*!
-    @brief  Sets the gain and input voltage range
-*/
-/**************************************************************************/
-void Adafruit_ADS1015::setGain(adsGain_t gain)
-{
-    m_gain = gain;
-}
-
-/**************************************************************************/
-/*!
-    @brief  Gets a gain and input voltage range
-*/
-/**************************************************************************/
-adsGain_t Adafruit_ADS1015::getGain()
-{
-    return m_gain;
-}
-
-/**************************************************************************/
-/*!
-    @brief  Gets a single-ended ADC reading from the specified channel
-*/
-/**************************************************************************/
-uint16_t Adafruit_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   | // 1600 samples per second (default)
-                      ADS1015_REG_CONFIG_MODE_SINGLE;   // Single-shot mode (default)
-
-    // Set PGA/voltage range
-    config |= m_gain;
-
-    // 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;
-    }
-
-    // Set 'start single-conversion' bit
-    config |= ADS1015_REG_CONFIG_OS_SINGLE;
-
-    // Write config register to the ADC
-    writeRegister(m_i2cAddress, ADS1015_REG_POINTER_CONFIG, config);
-
-    // Wait for the conversion to complete
-    wait_ms(m_conversionDelay);
-
-    // Read the conversion results
-    // Shift 12-bit results right 4 bits for the ADS1015
-    return readRegister(m_i2cAddress, ADS1015_REG_POINTER_CONVERT) >> m_bitShift;
-}
-
-/**************************************************************************/
-/*!
-    @brief  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 Adafruit_ADS1015::readADC_Differential_0_1()
-{
-    // 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   | // 1600 samples per second (default)
-                      ADS1015_REG_CONFIG_MODE_SINGLE;   // Single-shot mode (default)
-
-    // Set PGA/voltage range
-    config |= m_gain;
-
-    // Set channels
-    config |= ADS1015_REG_CONFIG_MUX_DIFF_0_1;          // AIN0 = P, AIN1 = N
-
-    // Set 'start single-conversion' bit
-    config |= ADS1015_REG_CONFIG_OS_SINGLE;
-
-    // Write config register to the ADC
-    writeRegister(m_i2cAddress, ADS1015_REG_POINTER_CONFIG, config);
-
-    // Wait for the conversion to complete
-    wait_ms(m_conversionDelay);
-
-    // Read the conversion results
-    uint16_t res = readRegister(m_i2cAddress, ADS1015_REG_POINTER_CONVERT) >> m_bitShift;
-    if (m_bitShift == 0) {
-        return (int16_t)res;
-    } else {
-        // Shift 12-bit results right 4 bits for the ADS1015,
-        // making sure we keep the sign bit intact
-        if (res > 0x07FF) {
-            // negative number - extend the sign to 16th bit
-            res |= 0xF000;
-        }
-        return (int16_t)res;
-    }
-}
-
-/**************************************************************************/
-/*!
-    @brief  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 Adafruit_ADS1015::readADC_Differential_2_3()
-{
-    // 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   | // 1600 samples per second (default)
-                      ADS1015_REG_CONFIG_MODE_SINGLE;   // Single-shot mode (default)
-
-    // Set PGA/voltage range
-    config |= m_gain;
-
-    // Set channels
-    config |= ADS1015_REG_CONFIG_MUX_DIFF_2_3;          // AIN2 = P, AIN3 = N
-
-    // Set 'start single-conversion' bit
-    config |= ADS1015_REG_CONFIG_OS_SINGLE;
-
-    // Write config register to the ADC
-    writeRegister(m_i2cAddress, ADS1015_REG_POINTER_CONFIG, config);
-
-    // Wait for the conversion to complete
-    wait_ms(m_conversionDelay);
-
-    // Read the conversion results
-    uint16_t res = readRegister(m_i2cAddress, ADS1015_REG_POINTER_CONVERT) >> m_bitShift;
-    if (m_bitShift == 0) {
-        return (int16_t)res;
-    } else {
-        // Shift 12-bit results right 4 bits for the ADS1015,
-        // making sure we keep the sign bit intact
-        if (res > 0x07FF) {
-            // negative number - extend the sign to 16th bit
-            res |= 0xF000;
-        }
-        return (int16_t)res;
-    }
-}
-
-/**************************************************************************/
-/*!
-    @brief  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 Adafruit_ADS1015::startComparator_SingleEnded(uint8_t channel, int16_t threshold)
-{
-    // Start with default values
-    uint16_t config = ADS1015_REG_CONFIG_CQUE_1CONV   | // Comparator enabled and asserts on 1 match
-                      ADS1015_REG_CONFIG_CLAT_LATCH   | // Latching mode
-                      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   | // 1600 samples per second (default)
-                      ADS1015_REG_CONFIG_MODE_CONTIN  | // Continuous conversion mode
-                      ADS1015_REG_CONFIG_MODE_CONTIN;   // Continuous conversion mode
-
-    // Set PGA/voltage range
-    config |= m_gain;
-
-    // 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;
-    }
-
-    // Set the high threshold register
-    // Shift 12-bit results left 4 bits for the ADS1015
-    writeRegister(m_i2cAddress, ADS1015_REG_POINTER_HITHRESH, threshold << m_bitShift);
-
-    // Write config register to the ADC
-    writeRegister(m_i2cAddress, ADS1015_REG_POINTER_CONFIG, config);
-}
-
-/**************************************************************************/
-/*!
-    @brief  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 Adafruit_ADS1015::getLastConversionResults()
-{
-    // Wait for the conversion to complete
-    wait_ms(m_conversionDelay);
-
-    // Read the conversion results
-    uint16_t res = readRegister(m_i2cAddress, ADS1015_REG_POINTER_CONVERT) >> m_bitShift;
-    if (m_bitShift == 0) {
-        return (int16_t)res;
-    } else {
-        // Shift 12-bit results right 4 bits for the ADS1015,
-        // making sure we keep the sign bit intact
-        if (res > 0x07FF) {
-            // negative number - extend the sign to 16th bit
-            res |= 0xF000;
-        }
-        return (int16_t)res;
-    }
-}
\ No newline at end of file