// REF: https://github.com/Helmuthn/ads8689_Arduino

#ifndef ADS868X_HPP
#define ADS868X_HPP
#include <Arduino.h>
#include <SPI.h>

// Register Locations and Names
#define ADS8689_DEVICE_ID_REG   0x00
#define ADS8689_RST_PWRCTL_REG  0x04
#define ADS8689_SDI_CTL_REG     0x08
#define ADS8689_SDO_CTL_REG     0x0C
#define ADS8689_DATAOUT_CTL_REG 0x10
#define ADS8689_RANGE_SEL_REG   0x14
#define ADS8689_ALARM_REG       0x20
#define ADS8689_ALARM_H_TH_REG  0x24
#define ADS8689_ALARM_L_TH_REG  0x28

// SPI commands
#define ADS8689_NOP         0b0000000
#define ADS8689_CLEAR_HWORD 0b1100000
#define ADS8689_READ_HWORD  0b1100100
#define ADS8689_READ        0b0100100
#define ADS8689_WRITE_FULL  0b1101000
#define ADS8689_WRITE_MS    0b1101001
#define ADS8689_WRITE_LS    0b1101010
#define ADS8689_SET_HWORD   0b1101100

// CSPIN


class ADC_ads868x
{
  public:
    ADC_ads868x(SPIClass *spi, uint8_t buffer_size, uint8_t cs_pin, uint16_t range_sel = 0x0004);
    void transmit(uint8_t command,uint16_t address, uint16_t data);
    uint32_t readBuffer(void);
    uint8_t inputAvailable(void);
    uint16_t readADC(void);
    void clearBuffer(void);
    void reset(void);
    ~ADC_ads868x();
  private:
    SPIClass *spi;
    SPISettings _spi_settings = SPISettings(16000000, MSBFIRST, SPI_MODE0);
    uint8_t _cs_pin;
    uint32_t* _receive_buffer;
    uint8_t _buffer_size;
    uint8_t _buffer_store_num;
    uint32_t _tmp;
    uint8_t _transmit_bytes[4];
    uint16_t _range_sel;
};

#endif