/*
        ADS1256.h - Arduino Library for communication with Texas Instrument ADS1256 ADC
        Written by Adien Akhmad, August 2015
    Modifified  Jan 2019 by Axel Sepulveda for ATMEGA328
*/

#ifndef ADS1256_h
#define ADS1256_h

#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168__)

#define pinDRDY 9
#define pinRST 8
#define pinCS 10

#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)

#define pinDRDY 49
#define pinRST 48
#define pinCS 53

// Contributions are welcome
#elif defined(ARDUINO_ARCH_ESP8266)
// https://esp8266-shop.com/esp8266-guide/esp8266-nodemcu-pinout/
#define pinDRDY D0
#define pinRST D1
#define pinCS D8 // D8 Hw Cs in esp8266

#elif defined(ARDUINO_ARCH_ESP32)
// Contributions are welcome
// https://circuits4you.com/wp-content/uploads/2018/12/ESP32-Pinout.jpg
#define pinDRDY 17
#define pinRST 16
#define pinCS 5 //
#else
// Contributions are welcome
#warning "Oops! Pins for your board are not defined: pinDRDY, pinRST, pinCS"
#endif

// ADS1256 Register address
#define ADS1256_RADD_STATUS 0x00
#define ADS1256_RADD_MUX 0x01
#define ADS1256_RADD_ADCON 0x02
#define ADS1256_RADD_DRATE 0x03
#define ADS1256_RADD_IO 0x04
#define ADS1256_RADD_OFC0 0x05
#define ADS1256_RADD_OFC1 0x06
#define ADS1256_RADD_OFC2 0x07
#define ADS1256_RADD_FSC0 0x08
#define ADS1256_RADD_FSC1 0x09
#define ADS1256_RADD_FSC2 0x0A

// ADS1256 Command
#define ADS1256_CMD_WAKEUP 0x00
#define ADS1256_CMD_RDATA 0x01
#define ADS1256_CMD_RDATAC 0x03
#define ADS1256_CMD_SDATAC 0x0f
#define ADS1256_CMD_RREG 0x10
#define ADS1256_CMD_WREG 0x50
#define ADS1256_CMD_SELFCAL 0xF0
#define ADS1256_CMD_SELFOCAL 0xF1
#define ADS1256_CMD_SELFGCAL 0xF2
#define ADS1256_CMD_SYSOCAL 0xF3
#define ADS1256_CMD_SYSGCAL 0xF4
#define ADS1256_CMD_SYNC 0xFC
#define ADS1256_CMD_STANDBY 0xFD
#define ADS1256_CMD_RESET 0xFE

// define multiplexer codes
#define ADS1256_MUXP_AIN0 0x00
#define ADS1256_MUXP_AIN1 0x10
#define ADS1256_MUXP_AIN2 0x20
#define ADS1256_MUXP_AIN3 0x30
#define ADS1256_MUXP_AIN4 0x40
#define ADS1256_MUXP_AIN5 0x50
#define ADS1256_MUXP_AIN6 0x60
#define ADS1256_MUXP_AIN7 0x70
#define ADS1256_MUXP_AINCOM 0x80

#define ADS1256_MUXN_AIN0 0x00
#define ADS1256_MUXN_AIN1 0x01
#define ADS1256_MUXN_AIN2 0x02
#define ADS1256_MUXN_AIN3 0x03
#define ADS1256_MUXN_AIN4 0x04
#define ADS1256_MUXN_AIN5 0x05
#define ADS1256_MUXN_AIN6 0x06
#define ADS1256_MUXN_AIN7 0x07
#define ADS1256_MUXN_AINCOM 0x08

// define gain codes
#define ADS1256_GAIN_1 0x00
#define ADS1256_GAIN_2 0x01
#define ADS1256_GAIN_4 0x02
#define ADS1256_GAIN_8 0x03
#define ADS1256_GAIN_16 0x04
#define ADS1256_GAIN_32 0x05
#define ADS1256_GAIN_64 0x06

// define drate codes
/*
        NOTE : 	Data Rate vary depending on crystal frequency. Data rates
   listed below assumes the crystal frequency is 7.68Mhz
                for other frequency consult the datasheet.
*/

#define ADS1256_DRATE_30000SPS 0xF0
#define ADS1256_DRATE_15000SPS 0xE0
#define ADS1256_DRATE_7500SPS 0xD0
#define ADS1256_DRATE_3750SPS 0xC0
#define ADS1256_DRATE_2000SPS 0xB0
#define ADS1256_DRATE_1000SPS 0xA1
#define ADS1256_DRATE_500SPS 0x92
#define ADS1256_DRATE_100SPS 0x82
#define ADS1256_DRATE_60SPS 0x72
#define ADS1256_DRATE_50SPS 0x63
#define ADS1256_DRATE_30SPS 0x53
#define ADS1256_DRATE_25SPS 0x43
#define ADS1256_DRATE_15SPS 0x33
#define ADS1256_DRATE_10SPS 0x23
#define ADS1256_DRATE_5SPS 0x13
#define ADS1256_DRATE_2_5SPS 0x03

#include "Arduino.h"
#include "SPI.h"

class ADS1256
{
public:
    ADS1256(float clockspdMhz, float vref, bool useresetpin);
    void writeRegister(unsigned char reg, unsigned char wdata);
    unsigned char readRegister(unsigned char reg);
    void sendCommand(unsigned char cmd);
    float readCurrentChannel();
    long readCurrentChannelRaw();
    void setConversionFactor(float val);
    void setChannel(byte channel);
    void setChannel(byte AIP, byte AIN);
    void begin(unsigned char drate, unsigned char gain, bool bufferenable);
    void begin();
    uint8_t getStatus();
    void waitDRDY();
    boolean isDRDY();
    void setGain(uint8_t gain);
    void readTest();

private:
    void CSON();
    void CSOFF();
    unsigned long read_uint24();
    long read_int32();
    float read_float32();
    byte _pga;
    float _VREF;
    float _conversionFactor;
};

#endif