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Revision 0:4dd9af114f46, committed 2019-03-06
- Comitter:
- etiene32
- Date:
- Wed Mar 06 10:46:05 2019 +0000
- Commit message:
- dd
Changed in this revision
| Adafruit_ADS1015.cpp | Show annotated file Show diff for this revision Revisions of this file |
| Adafruit_ADS1015.h | Show annotated file Show diff for this revision Revisions of this file |
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Adafruit_ADS1015.cpp Wed Mar 06 10:46:05 2019 +0000
@@ -0,0 +1,326 @@
+/**************************************************************************/
+/*!
+ @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(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_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_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_1600SPS | // 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;
+ }
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/Adafruit_ADS1015.h Wed Mar 06 10:46:05 2019 +0000
@@ -0,0 +1,149 @@
+/**************************************************************************/
+/*!
+ @file Adafruit_ADS1015.h
+ @author K. Townsend (Adafruit Industries)
+ @license BSD (see LICENSE.txt)
+
+ Ported to mbed by Arve Seljebu - arve0.github.io
+
+ This is a library for the Adafruit ADS1015 breakout board
+ ----> 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 - Added ADS1115 support - W. Earl
+ v1.1.1 - Ported to mbed - Arve Seljebu
+*/
+/**************************************************************************/
+
+#include <mbed.h>
+
+/*=========================================================================
+ 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 - ADS1115 8SPS
+ #define ADS1015_REG_CONFIG_DR_250SPS (0x0020) // 250 samples per second - ADS1115 16SPS
+ #define ADS1015_REG_CONFIG_DR_490SPS (0x0040) // 490 samples per second - ADS1115 32SPS
+ #define ADS1015_REG_CONFIG_DR_920SPS (0x0060) // 920 samples per second - ADS1115 64SPS
+ #define ADS1015_REG_CONFIG_DR_1600SPS (0x0080) // 1600 samples per second - ADS1115 250SPS (default)
+ #define ADS1015_REG_CONFIG_DR_2400SPS (0x00A0) // 2400 samples per second - ADS1115 475SPS
+ #define ADS1015_REG_CONFIG_DR_3300SPS (0x00C0) // 3300 samples per second - ADS1115 860SPS
+
+ #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)
+/*=========================================================================*/
+
+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;
+
+class Adafruit_ADS1015
+{
+protected:
+ // Instance-specific properties
+ uint8_t m_i2cAddress;
+ uint8_t m_conversionDelay;
+ uint8_t m_bitShift;
+ adsGain_t m_gain;
+ I2C* m_i2c;
+
+
+public:
+ Adafruit_ADS1015(I2C* i2c = 0, uint8_t i2cAddress = ADS1015_ADDRESS); // set i2c adress = 0 to allow ADS1115 to use this as default constructor
+ uint16_t readADC_SingleEnded(uint8_t channel);
+ int16_t readADC_Differential_0_1(void);
+ int16_t readADC_Differential_2_3(void);
+ void startComparator_SingleEnded(uint8_t channel, int16_t threshold);
+ int16_t getLastConversionResults();
+ void setGain(adsGain_t gain);
+ adsGain_t getGain(void);
+
+private:
+ uint16_t readRegister(uint8_t i2cAddress, uint8_t reg);
+ void writeRegister(uint8_t i2cAddress, uint8_t reg, uint16_t value);
+};
+
+// Derive from ADS1105 & override construction to set properties
+class Adafruit_ADS1115 : public Adafruit_ADS1015
+{
+public:
+ Adafruit_ADS1115(I2C* i2c, uint8_t i2cAddress = ADS1015_ADDRESS);
+
+private:
+};
\ No newline at end of file