File content as of revision 0:c8da8e2afe09:

/*
  Library for the Maxim MAX30100 pulse oximetry system
  Connor Huffine/Kontakt
  February 2016
*/

// Registers
#define MAX30100_INT_STATUS     0x00  // Which interrupts are tripped
#define MAX30100_INT_ENABLE     0x01  // Which interrupts are active
#define MAX30100_FIFO_WR_PTR    0x02  // Where data is being written
#define MAX30100_OVRFLOW_CTR    0x03  // Number of lost samples
#define MAX30100_FIFO_RD_PTR    0x04  // Where to read from
#define MAX30100_FIFO_DATA      0x05  // Ouput data buffer
#define MAX30100_MODE_CONFIG    0x06  // Control register
#define MAX30100_SPO2_CONFIG    0x07  // Oximetry settings
#define MAX30100_LED_CONFIG     0x09  // Pulse width and power of LEDs
#define MAX30100_TEMP_INTG      0x16  // Temperature value, whole number
#define MAX30100_TEMP_FRAC      0x17  // Temperature value, fraction
#define MAX30100_REV_ID         0xFE  // Part revision
#define MAX30100_PART_ID        0xFF  // Part ID, normally 0x11

#define MAX30100_ADDRESS        0x57  // 8bit address converted to 7bit

//typedef unsigned char uint8_t;
//typedef unsigned int uint16_t;
typedef enum{ // This is the same for both LEDs
  pw200,    // 200us pulse
  pw400,    // 400us pulse
  pw800,    // 800us pulse
  pw1600    // 1600us pulse
}pulseWidth;

typedef enum{
  sr50,    // 50 samples per second
  sr100,   // 100 samples per second
  sr167,   // 167 samples per second
  sr200,   // 200 samples per second
  sr400,   // 400 samples per second
  sr600,   // 600 samples per second
  sr800,   // 800 samples per second
  sr1000   // 1000 samples per second
}sampleRate;

typedef enum{
  i0,    // No current
  i4,    // 4.4mA
  i8,    // 7.6mA
  i11,   // 11.0mA
  i14,   // 14.2mA
  i17,   // 17.4mA
  i21,   // 20.8mA
  i27,   // 27.1mA
  i31,   // 30.6mA
  i34,   // 33.8mA
  i37,   // 37.0mA
  i40,   // 40.2mA
  i44,   // 43.6mA
  i47,   // 46.8mA
  i50    // 50.0mA
}ledCurrent;

class MAX30100 {
public:
    uint16_t IR;     // Last IR reflectance datapoint 0 defoult
    uint16_t RED;     // Last Red reflectance datapoint 0 defoult

  MAX30100();
  void  setLEDs(pulseWidth pw, ledCurrent red, ledCurrent ir);  // Sets the LED state
  void  setSPO2(sampleRate sr); // Setup the SPO2 sensor, disabled by default
  int   getNumSamp(void);       // Get number of samples
  void  readSensor(void);       // Updates the values
  void  shutdown(void);   // Instructs device to power-save
  void  reset(void);      // Resets the device
  void  startup(void);    // Leaves power-save
  int   getRevID(void);   // Gets revision ID
  int   getPartID(void);  // Gets part ID
  void  begin(pulseWidth pw = pw1600, // Longest pulseWidth
              ledCurrent ir = i50,    // Highest current
              sampleRate sr = sr100); // 2nd lowest sampleRate
  void  printRegisters(void); // Dumps contents of registers for debug

private:
  void    I2CwriteByte(uint8_t address, uint8_t subAddress, uint8_t data);
  uint8_t I2CreadByte(uint8_t address, uint8_t subAddress);
  void    I2CreadBytes(uint8_t address, uint8_t subAddress, uint8_t * dest, uint8_t count);
};