Diff: Adafruit_ADS1015.cpp

Revision:

0:387c3e3b28f1

Child:

2:68c4863a39cd

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Adafruit_ADS1015.cpp	Thu Sep 01 13:42:16 2016 +0000
@@ -0,0 +1,313 @@
+
+#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;
+    m_i2c->frequency(400000);//1000000
+}
+
+/**************************************************************************/
+/*!
+    @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(ADS1015) or 250(ADS1115) 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_CLAT_LATCH   |
+                      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(ADS1015) or 250(ADS1115) samples per second (default)
+                      ADS1015_REG_CONFIG_DR_3300SPS   |  //3300 or 860(ADS1115)
+                      ADS1015_REG_CONFIG_MODE_CONTIN;
+                      //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(ADS1015) or 250(ADS1115) 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_3300SPS   | // 1600(ADS1015) or 250(ADS1115) 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;
+    }
+}
+
+void Adafruit_ADS1015::user(){
+    
+    writeRegister(m_i2cAddress, ADS1015_REG_POINTER_CONFIG , 0b0000001011101111);// 
+  
+}
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