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ADS129X.h
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/**
* ADS129X.cpp
*
* Arduino library for the TI ADS129X series of analog-front-ends for
* biopotential measurements (EMG/EKG/EEG).
*
* This library offers two modes of operation: polling and interrupt.
* Polling mode should only be used in situations where multiple devices
* share the SPI bus. Interrupt mode is much faster (8kSPS on a Teensy 3.1),
* but starts receiving immediately when DRDY goes high.
* The API is the same for both modes. To activate polling mode add
* #define ADS129X_POLLING
* as first line to your sketch.
*
* Based on code by Conor Russomanno (https://github.com/conorrussomanno/ADS1299)
* Modified by Ferdinand Keil
*/
#ifndef ____ADS129X__
#define ____ADS129X__
// Compatibility with the Arduino 1.0 library standard
#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif
// SPI Command Definition Byte Assignments (Datasheet, pg. 35)
#define ADS129X_CMD_WAKEUP 0x02 // Wake-up from standby mode
#define ADS129X_CMD_STANDBY 0x04 // Enter Standby mode
#define ADS129X_CMD_RESET 0x06 // Reset the device
#define ADS129X_CMD_START 0x08 // Start and restart (synchronize) conversions
#define ADS129X_CMD_STOP 0x0A // Stop conversion
#define ADS129X_CMD_RDATAC 0x10 // Enable Read Data Continuous mode (default mode at power-up)
#define ADS129X_CMD_SDATAC 0x11 // Stop Read Data Continuous mode
#define ADS129X_CMD_RDATA 0x12 // Read data by command; supports multiple read back
#define ADS129X_CMD_RREG 0x20 // (also = 00100000) is the first opcode that the address must be added to for RREG communication
#define ADS129X_CMD_WREG 0x40 // 01000000 in binary (Datasheet, pg. 35)
// Register Addresses
#define ADS129X_REG_ID 0x00 // ID Control Register
#define ADS129X_REG_CONFIG1 0x01 // Configuration Register 1
#define ADS129X_REG_CONFIG2 0x02 // Configuration Register 2
#define ADS129X_REG_CONFIG3 0x03 // Configuration Register 3
#define ADS129X_REG_LOFF 0x04 // Lead-Off Control Register
#define ADS129X_REG_CH1SET 0x05 // Individual Channel Settings 1-8
#define ADS129X_REG_CH2SET 0x06 // ---
#define ADS129X_REG_CH3SET 0x07 // ---
#define ADS129X_REG_CH4SET 0x08 // ---
#define ADS129X_REG_CH5SET 0x09 // ---
#define ADS129X_REG_CH6SET 0x0A // ---
#define ADS129X_REG_CH7SET 0x0B // ---
#define ADS129X_REG_CH8SET 0x0C // ---
#define ADS129X_REG_RLD_SENSP 0x0D // Right Leg Drive, positive side
#define ADS129X_REG_RLD_SENSN 0x0E // Right Leg Drive, negative side
#define ADS129X_REG_LOFF_SENSP 0x0F // Lead-Off Detection, positive side
#define ADS129X_REG_LOFF_SENSN 0x10 // Lead-Off Detection, negative side
#define ADS129X_REG_LOFF_FLIP 0x11 // Lead-Off Detection, current direction
#define ADS129X_REG_LOFF_STATP 0x12 // Electrode Status, positive (read-only)
#define ADS129X_REG_LOFF_STATN 0x13 // Electrode Status, negative (read-only)
#define ADS129X_REG_GPIO 0x14 // General-Purpose I/O Register
#define ADS129X_REG_PACE 0x15 // PACE Detect Register
#define ADS129X_REG_RESP 0x16 // Respiration Control Register
#define ADS129X_REG_CONFIG4 0x17 // Configuration Register 4
#define ADS129X_REG_WCT1 0x18 // Wilson Central Terminal and Augmented Lead Control Register
#define ADS129X_REG_WCT2 0x19 // Wilson Central Terminal Control Register
// IDs
#define ADS129X_ID_ADS1294 0x90
#define ADS129X_ID_ADS1296 0x91
#define ADS129X_ID_ADS1298 0x92
#define ADS129X_ID_ADS1294R 0xD0
#define ADS129X_ID_ADS1296R 0xD1
#define ADS129X_ID_ADS1298R 0xD2
// Configuration Register 1
#define ADS129X_BIT_HR 0x7
#define ADS129X_BIT_DAISY_EN 0x6
#define ADS129X_BIT_CLK_EN 0x5
// always 0
// always 0
#define ADS129X_BIT_DR2 0x2
#define ADS129X_BIT_DR1 0x1
#define ADS129X_BIT_DR0 0x0
// Configuration Register 2
// always 0
// always 0
#define ADS129X_BIT_WCT_CHOP 0x5
#define ADS129X_BIT_INT_TEST 0x4
// always 0
#define ADS129X_BIT_TEST_AMP 0x2
#define ADS129X_BIT_TEST_FREQ1 0x1
#define ADS129X_BIT_TEST_FREQ0 0x0
#define ADS129X_TEST_FREQ_1HZ 0x0
#define ADS129X_TEST_FREQ_2HZ 0x1
#define ADS129X_TEST_FREQ_DC 0x3
// Configuration Register 3
#define ADS129X_BIT_PD_REFBUF 0x7
// always 1
#define ADS129X_BIT_VREF_4V 0x5
#define ADS129X_BIT_RLD_MEAS 0x4
#define ADS129X_BIT_RLDREF_INT 0x3
#define ADS129X_BIT_PD_RLD 0x2
#define ADS129X_BIT_RLD_LOFF_SENS 0x1
#define ADS129X_BIT_RLD_STAT 0x0
// Lead-Off Control Register
#define ADS129X_BIT_COMP_TH2 0x7
#define ADS129X_BIT_COMP_TH1 0x6
#define ADS129X_BIT_COMP_TH0 0x5
#define ADS129X_BIT_VLEAD_OFF_EN 0x4
#define ADS129X_BIT_ILEAD_OFF1 0x3
#define ADS129X_BIT_ILEAD_OFF0 0x2
#define ADS129X_BIT_FLEAD_OFF1 0x1
#define ADS129X_BIT_FLEAD_OFF0 0x0
// Individual Channel Settings
#define ADS129X_BIT_PD 0x7
#define ADS129X_BIT_GAIN2 0x6
#define ADS129X_BIT_GAIN1 0x5
#define ADS129X_BIT_GAIN0 0x4
// always 0
#define ADS129X_BIT_MUX2 0x2
#define ADS129X_BIT_MUX1 0x1
#define ADS129X_BIT_MUX0 0x0
// Channel Select
#define ADS129X_BIT_CH8 0x7
#define ADS129X_BIT_CH7 0x6
#define ADS129X_BIT_CH6 0x5
#define ADS129X_BIT_CH5 0x4
#define ADS129X_BIT_CH4 0x3
#define ADS129X_BIT_CH3 0x2
#define ADS129X_BIT_CH2 0x1
#define ADS129X_BIT_CH1 0x0
// General-Purpose I/O Register
#define ADS129X_BIT_GPIOD4 0x7
#define ADS129X_BIT_GPIOD3 0x6
#define ADS129X_BIT_GPIOD2 0x5
#define ADS129X_BIT_GPIOD1 0x4
#define ADS129X_BIT_GPIOC4 0x3
#define ADS129X_BIT_GPIOC3 0x2
#define ADS129X_BIT_GPIOC2 0x1
#define ADS129X_BIT_GPIOC1 0x0
// PACE Detect Register
// always 0
// always 0
// always 0
#define ADS129X_BIT_PACEE1 0x4
#define ADS129X_BIT_PACEE0 0x3
#define ADS129X_BIT_PACEO1 0x2
#define ADS129X_BIT_PACEO0 0x1
#define ADS129X_BIT_PD_PACE 0x0
// Respiration Control Register
#define ADS129X_BIT_RESP_DEMOD_EN1 0x7
#define ADS129X_BIT_RESP_MOD_EN1 0x6
// always 1
#define ADS129X_BIT_RESP_PH2 0x4
#define ADS129X_BIT_RESP_PH1 0x3
#define ADS129X_BIT_RESP_PH0 0x2
#define ADS129X_BIT_RESP_CTRL1 0x1
#define ADS129X_BIT_RESP_CTRL0 0x0
// Configuration Register 4
#define ADS129X_BIT_RESP_FREQ2 0x7
#define ADS129X_BIT_RESP_FREQ1 0x6
#define ADS129X_BIT_RESP_FREQ0 0x5
// always 0
#define ADS129X_BIT_SINGLE_SHOT 0x3
#define ADS129X_BIT_WCT_TO_RLD 0x2
#define ADS129X_BIT_PD_LOFF_COMP 0x1
// always 0
// Wilson Central Terminal and Augmented Lead Control Register
#define ADS129X_BIT_aVF_CH6 0x7
#define ADS129X_BIT_aVF_CH5 0x6
#define ADS129X_BIT_aVF_CH7 0x5
#define ADS129X_BIT_aVF_CH4 0x4
#define ADS129X_BIT_PD_WCTA 0x3
#define ADS129X_BIT_WCTA2 0x2
#define ADS129X_BIT_WCTA1 0x1
#define ADS129X_BIT_WCTA0 0x0
// Wilson Central Terminal Control Register
#define ADS129X_BIT_PD_WCTC 0x7
#define ADS129X_BIT_PD_WCTB 0x6
#define ADS129X_BIT_WCTB2 0x5
#define ADS129X_BIT_WCTB1 0x4
#define ADS129X_BIT_WCTB0 0x3
#define ADS129X_BIT_WCTC2 0x2
#define ADS129X_BIT_WCTC1 0x1
#define ADS129X_BIT_WCTC0 0x0
// Gain Configuration
#define ADS129X_GAIN_6X 0x0
#define ADS129X_GAIN_1X 0x1
#define ADS129X_GAIN_2X 0x2
#define ADS129X_GAIN_3X 0x3
#define ADS129X_GAIN_4X 0x4
#define ADS129X_GAIN_8X 0x5
#define ADS129X_GAIN_12X 0x6
// Mux Configuration
#define ADS129X_MUX_NORMAL 0x0 // Normal electrode input (default)
#define ADS129X_MUX_SHORT 0x1 // Input shorted (for offset or noise measurements)
#define ADS129X_MUX_RLD_MEAS 0x2 // Used in conjunction with RLD_MEAS bit for RLD measurements
#define ADS129X_MUX_MVDD 0x3 // MVDD for supply measurement
#define ADS129X_MUX_TEMP 0x4 // Temperature sensor
#define ADS129X_MUX_TEST 0x5 // Test signal
#define ADS129X_MUX_RLD_DRP 0x6 // RLD_DRP (positive electrode is the driver)
#define ADS129X_MUX_RLD_DRN 0x7 // RLD_DRN (negative electrode is the driver)
// Sample-rate Configuration
#define ADS129X_SAMPLERATE_1024 0x6
#define ADS129X_SAMPLERATE_512 0x5
#define ADS129X_SAMPLERATE_256 0x4
#define ADS129X_SAMPLERATE_128 0x3
#define ADS129X_SAMPLERATE_64 0x2
#define ADS129X_SAMPLERATE_32 0x1
#define ADS129X_SAMPLERATE_16 0x0
class ADS129X {
public:
ADS129X(int _DRDY, int _CS);
// ADS129X SPI Command Definitions (Datasheet, Pg. 35)
// System Commands
void WAKEUP();
void STANDBY();
void RESET();
void START();
void STOP();
// Data Read Commands
void RDATAC();
void SDATAC();
void RDATA();
// Register Read/Write Commands
byte RREG(byte _address);
void RREG(byte _address, byte _numRegisters, byte *_data); //to read multiple consecutive registers (Datasheet, pg. 38)
void WREG(byte _address, byte _value);
// Functions for setup and data retrieval
byte getDeviceId();
boolean getData(long *buffer);
void configChannel(byte _channel, boolean _powerDown, byte _gain, byte _mux);
private:
int DRDY, CS; //pin numbers for "Data Ready" (DRDY) and "Chip Select" CS (Datasheet, pg. 26)
};
#endif