/*************************************************** 
  This is a library for the Si1145 UV/IR/Visible Light Sensor

  Designed specifically to work with the Si1145 sensor in the
  adafruit shop
  ----> https://www.adafruit.com/products/1777

  These sensors use I2C to communicate, 2 pins are required to  
  interface
  Adafruit invests time and resources providing this open source code, 
  please support Adafruit and open-source hardware by purchasing 
  products from Adafruit!

  Written by Limor Fried/Ladyada for Adafruit Industries.  
  BSD license, all text above must be included in any redistribution
 ****************************************************/


#if (ARDUINO >= 100)
 #include "Arduino.h"
#else
 #include "WProgram.h"
#endif
#include <Wire.h>

/* COMMANDS */
#define SI1145_PARAM_QUERY 0x80
#define SI1145_PARAM_SET 0xA0
#define SI1145_NOP 0x0
#define SI1145_RESET    0x01
#define SI1145_BUSADDR    0x02
#define SI1145_PS_FORCE    0x05
#define SI1145_ALS_FORCE    0x06
#define SI1145_PSALS_FORCE    0x07
#define SI1145_PS_PAUSE    0x09
#define SI1145_ALS_PAUSE    0x0A
#define SI1145_PSALS_PAUSE    0xB
#define SI1145_PS_AUTO    0x0D
#define SI1145_ALS_AUTO   0x0E
#define SI1145_PSALS_AUTO 0x0F
#define SI1145_GET_CAL    0x12

/* Parameters */
#define SI1145_PARAM_I2CADDR 0x00
#define SI1145_PARAM_CHLIST   0x01
#define SI1145_PARAM_CHLIST_ENUV 0x80
#define SI1145_PARAM_CHLIST_ENAUX 0x40
#define SI1145_PARAM_CHLIST_ENALSIR 0x20
#define SI1145_PARAM_CHLIST_ENALSVIS 0x10
#define SI1145_PARAM_CHLIST_ENPS1 0x01
#define SI1145_PARAM_CHLIST_ENPS2 0x02
#define SI1145_PARAM_CHLIST_ENPS3 0x04

#define SI1145_PARAM_PSLED12SEL   0x02
#define SI1145_PARAM_PSLED12SEL_PS2NONE 0x00
#define SI1145_PARAM_PSLED12SEL_PS2LED1 0x10
#define SI1145_PARAM_PSLED12SEL_PS2LED2 0x20
#define SI1145_PARAM_PSLED12SEL_PS2LED3 0x40
#define SI1145_PARAM_PSLED12SEL_PS1NONE 0x00
#define SI1145_PARAM_PSLED12SEL_PS1LED1 0x01
#define SI1145_PARAM_PSLED12SEL_PS1LED2 0x02
#define SI1145_PARAM_PSLED12SEL_PS1LED3 0x04

#define SI1145_PARAM_PSLED3SEL   0x03
#define SI1145_PARAM_PSENCODE   0x05
#define SI1145_PARAM_ALSENCODE  0x06

#define SI1145_PARAM_PS1ADCMUX   0x07
#define SI1145_PARAM_PS2ADCMUX   0x08
#define SI1145_PARAM_PS3ADCMUX   0x09
#define SI1145_PARAM_PSADCOUNTER   0x0A
#define SI1145_PARAM_PSADCGAIN 0x0B
#define SI1145_PARAM_PSADCMISC 0x0C
#define SI1145_PARAM_PSADCMISC_RANGE 0x20
#define SI1145_PARAM_PSADCMISC_PSMODE 0x04

#define SI1145_PARAM_ALSIRADCMUX   0x0E
#define SI1145_PARAM_AUXADCMUX   0x0F

#define SI1145_PARAM_ALSVISADCOUNTER   0x10
#define SI1145_PARAM_ALSVISADCGAIN 0x11
#define SI1145_PARAM_ALSVISADCMISC 0x12
#define SI1145_PARAM_ALSVISADCMISC_VISRANGE 0x20

#define SI1145_PARAM_ALSIRADCOUNTER   0x1D
#define SI1145_PARAM_ALSIRADCGAIN 0x1E
#define SI1145_PARAM_ALSIRADCMISC 0x1F
#define SI1145_PARAM_ALSIRADCMISC_RANGE 0x20

#define SI1145_PARAM_ADCCOUNTER_511CLK 0x70

#define SI1145_PARAM_ADCMUX_SMALLIR  0x00
#define SI1145_PARAM_ADCMUX_LARGEIR  0x03



/* REGISTERS */
#define SI1145_REG_PARTID  0x00
#define SI1145_REG_REVID  0x01
#define SI1145_REG_SEQID  0x02

#define SI1145_REG_INTCFG  0x03
#define SI1145_REG_INTCFG_INTOE 0x01
#define SI1145_REG_INTCFG_INTMODE 0x02

#define SI1145_REG_IRQEN  0x04
#define SI1145_REG_IRQEN_ALSEVERYSAMPLE 0x01
#define SI1145_REG_IRQEN_PS1EVERYSAMPLE 0x04
#define SI1145_REG_IRQEN_PS2EVERYSAMPLE 0x08
#define SI1145_REG_IRQEN_PS3EVERYSAMPLE 0x10


#define SI1145_REG_IRQMODE1 0x05
#define SI1145_REG_IRQMODE2 0x06

#define SI1145_REG_HWKEY  0x07
#define SI1145_REG_MEASRATE0 0x08
#define SI1145_REG_MEASRATE1  0x09
#define SI1145_REG_PSRATE  0x0A
#define SI1145_REG_PSLED21  0x0F
#define SI1145_REG_PSLED3  0x10
#define SI1145_REG_UCOEFF0  0x13
#define SI1145_REG_UCOEFF1  0x14
#define SI1145_REG_UCOEFF2  0x15
#define SI1145_REG_UCOEFF3  0x16
#define SI1145_REG_PARAMWR  0x17
#define SI1145_REG_COMMAND  0x18
#define SI1145_REG_RESPONSE  0x20
#define SI1145_REG_IRQSTAT  0x21
#define SI1145_REG_IRQSTAT_ALS  0x01

#define SI1145_REG_ALSVISDATA0 0x22
#define SI1145_REG_ALSVISDATA1 0x23
#define SI1145_REG_ALSIRDATA0 0x24
#define SI1145_REG_ALSIRDATA1 0x25
#define SI1145_REG_PS1DATA0 0x26
#define SI1145_REG_PS1DATA1 0x27
#define SI1145_REG_PS2DATA0 0x28
#define SI1145_REG_PS2DATA1 0x29
#define SI1145_REG_PS3DATA0 0x2A
#define SI1145_REG_PS3DATA1 0x2B
#define SI1145_REG_UVINDEX0 0x2C
#define SI1145_REG_UVINDEX1 0x2D
#define SI1145_REG_PARAMRD 0x2E
#define SI1145_REG_CHIPSTAT 0x30

#define SI1145_ADDR 0x60

class Adafruit_SI1145  {
 public:
  Adafruit_SI1145(void);
  boolean begin();
  void reset();

  uint16_t readUV();
  uint16_t readIR();
  uint16_t readVisible();
  uint16_t readProx();

 private:
  uint16_t read16(uint8_t addr);
  uint8_t read8(uint8_t addr);
  void write8(uint8_t reg, uint8_t val);
  uint8_t readParam(uint8_t p);
  uint8_t writeParam(uint8_t p, uint8_t v);

  uint8_t _addr;
};