#ifndef _MAX122x_H_
#define _MAX122x_H_

// SPI communication settings
  #define SPI_SETTINGS SPISettings(4000000, MSBFIRST, SPI_MODE0) // max 4.8MHz readout clock speed on MAX122x

// MAX122x Mode 11 registers
  // Conversion MSBFirst: BIT7:1|BIT6:CHSEL3|BIT5:CHSEL2|BIT4:CHSEL1|BIT3:CHSEL0|BIT2:SCAN1|BIT1:SCAN0|BIT0:TEMP
    #define MAX122x_CONVERT_CH0   0b10000110 // Initiates single ADC conversion on Ch0
    #define MAX122x_CONVERT_CH1   0b10001110 // Initiates single ADC conversion on Ch1
    #define MAX122x_CONVERT_CH2   0b10010110 // Initiates single ADC conversion on Ch2
    #define MAX122x_CONVERT_CH3   0b10011110 // Initiates single ADC conversion on Ch3
    #define MAX122x_CONVERT_CH4   0b10100110 // Initiates single ADC conversion on Ch4
    #define MAX122x_CONVERT_CH5   0b10101110 // Initiates single ADC conversion on Ch5
    #define MAX122x_CONVERT_CH6   0b10110110 // Initiates single ADC conversion on Ch6
    #define MAX122x_CONVERT_CH7   0b10111110 // Initiates single ADC conversion on Ch7
    #define MAX122x_CONVERT_CH8   0b11000110 // Initiates single ADC conversion on Ch8
    #define MAX122x_CONVERT_CH9   0b11001110 // Initiates single ADC conversion on Ch9
    #define MAX122x_CONVERT_CH10  0b11010110 // Initiates single ADC conversion on Ch10
    #define MAX122x_CONVERT_CH11  0b11011110 // Initiates single ADC conversion on Ch11
    #define MAX122x_CONVERT_TMP   0b10000001 // Initiates single TMP conversion  
  // Setup MSB first: BIT7:0|BIT6:1|BIT5:CKSEL1|BIT4:CKSEL0|BIT3:REFSEL1|BIT2:REFSEL0|BIT1:DIFFSEL1|BIT0:DIFFSEL0
    #define MAX122x_SETUP_0       0b01110000 // External Timed by SCLK, Internal Reference w/ wakeup time, no unipolar/bipolar register write
    #define MAX122x_SETUP_1       0b01111000 // External Timed by SCLK, Internal Reference w/o wakeup time, no unipolar/bipolar register write
    #define MAX122x_SETUP_2       0b01100000 // Internally timed, use of EOC signal, Internal Reference w/ wakeup time, no unipolar/bipolar register write
    #define MAX122x_SETUP_3       0b01101000 // Internally timed, use of EOC signal, Internal Reference w/o wakeup time, no unipolar/bipolar register write
  // Averaging
     // Not implemented because Mode 11 does not allow averaging and scanning
  // Reset (all registers to 0)
    #define MAX122x_RESET_ALL     0b00011000 // Resets all registers
    #define MAX122x_RESET_FIFO    0b00010000 // Clears FIFO only
  // Unipolar mode setup & bipolar mode setup
     // Not implemented since unipolar, single ended is default case

// May be needed depending on Arduino version
  #if (ARDUINO >=100)
    #include "Arduino.h"
  #else
    #include "WProgram.h"
  #endif

struct ADCresults0to3{
  uint16_t result_ch0,result_ch1,result_ch2,result_ch3;
};
  
struct ADCresults0to7{
  uint16_t result_ch0,result_ch1,result_ch2,result_ch3,result_ch4,result_ch5,result_ch6,result_ch7;
};

struct ADCresults0to11{
  uint16_t result_ch0,result_ch1,result_ch2,result_ch3,result_ch4,result_ch5,result_ch6,result_ch7,result_ch8,result_ch9,result_ch10,result_ch11;
};


// Create class for MAX122x ADC
class MAX122x_library  {
  public:
    // Constructor 
    MAX122x_library(bool displayMsg=false);

    // Methods
    float max122xreadTemp(uint8_t Chipselect_Pin);
    uint16_t max122xreadADCsingle(uint8_t Chipselect_Pin, byte channel);
    struct ADCresults0to3 max122xReadADC0to3(uint8_t Chipselect_Pin);
    struct ADCresults0to7 max122xReadADC0to7(uint8_t Chipselect_Pin);
    struct ADCresults0to11 max122xReadADC0to11(uint8_t Chipselect_Pin);
    float max122xFloatToVoltage(uint16_t adc_raw_value);

  private:

    uint8_t SPI_delay_commandSkip = 8; // in microseconds
    uint8_t SPI_delay_conversionTime = 65; // in microseconds

  
};
#endif // _MAX122x_H_