Grove_Sunlight_Sensor/SI114X.cpp

/*
    SI114X.cpp
    A library for Grove - Sunlight Sensor v1.0

    Copyright (c) 2015 seeed technology inc.
    Website    : www.seeed.cc
    Author     : Fuhua.Chen
    Modified Time: June 2015

    The MIT License (MIT)

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.
*/

#include "SI114X.h"
#include "Wire.h"
/*  --------------------------------------------------------//
    default init

*/
void SI114X::DeInit(void) {
    //ENABLE UV reading
    //these reg must be set to the fixed value
    WriteByte(SI114X_UCOEFF0, 0x29);
    WriteByte(SI114X_UCOEFF1, 0x89);
    WriteByte(SI114X_UCOEFF2, 0x02);
    WriteByte(SI114X_UCOEFF3, 0x00);
    WriteParamData(SI114X_CHLIST, SI114X_CHLIST_ENUV | SI114X_CHLIST_ENALSIR | SI114X_CHLIST_ENALSVIS |
                   SI114X_CHLIST_ENPS1);
    //
    //set LED1 CURRENT(22.4mA)(It is a normal value for many LED)
    //
    WriteParamData(SI114X_PS1_ADCMUX, SI114X_ADCMUX_LARGE_IR);
    WriteByte(SI114X_PS_LED21, SI114X_LED_CURRENT_22MA);
    WriteParamData(SI114X_PSLED12_SELECT, SI114X_PSLED12_SELECT_PS1_LED1); //
    //
    //PS ADC SETTING
    //
    WriteParamData(SI114X_PS_ADC_GAIN, SI114X_ADC_GAIN_DIV1);
    WriteParamData(SI114X_PS_ADC_COUNTER, SI114X_ADC_COUNTER_511ADCCLK);
    WriteParamData(SI114X_PS_ADC_MISC, SI114X_ADC_MISC_HIGHRANGE | SI114X_ADC_MISC_ADC_RAWADC);
    //
    //VIS ADC SETTING
    //
    WriteParamData(SI114X_ALS_VIS_ADC_GAIN, SI114X_ADC_GAIN_DIV1);
    WriteParamData(SI114X_ALS_VIS_ADC_COUNTER, SI114X_ADC_COUNTER_511ADCCLK);
    WriteParamData(SI114X_ALS_VIS_ADC_MISC, SI114X_ADC_MISC_HIGHRANGE);
    //
    //IR ADC SETTING
    //
    WriteParamData(SI114X_ALS_IR_ADC_GAIN, SI114X_ADC_GAIN_DIV1);
    WriteParamData(SI114X_ALS_IR_ADC_COUNTER, SI114X_ADC_COUNTER_511ADCCLK);
    WriteParamData(SI114X_ALS_IR_ADC_MISC, SI114X_ADC_MISC_HIGHRANGE);
    //
    //interrupt enable
    //
    WriteByte(SI114X_INT_CFG, SI114X_INT_CFG_INTOE);
    WriteByte(SI114X_IRQ_ENABLE, SI114X_IRQEN_ALS);
    //
    //AUTO RUN
    //
    WriteByte(SI114X_MEAS_RATE0, 0xFF);
    WriteByte(SI114X_COMMAND, SI114X_PSALS_AUTO);
}

/*  --------------------------------------------------------//
    Init the si114x and begin to collect data


*/
bool SI114X::Begin(void) {
    Wire.begin();
    //
    //Init IIC  and reset si1145
    //
    if (ReadByte(SI114X_PART_ID) != 0X45) {
        return false;
    }
    Reset();
    //
    //INIT
    //
    DeInit();
    return true;
}
/*  --------------------------------------------------------//
    reset the si114x
    inclue IRQ reg, command regs...

*/
void SI114X::Reset(void) {
    WriteByte(SI114X_MEAS_RATE0, 0);
    WriteByte(SI114X_MEAS_RATE1, 0);
    WriteByte(SI114X_IRQ_ENABLE, 0);
    WriteByte(SI114X_IRQ_MODE1, 0);
    WriteByte(SI114X_IRQ_MODE2, 0);
    WriteByte(SI114X_INT_CFG, 0);
    WriteByte(SI114X_IRQ_STATUS, 0xFF);

    WriteByte(SI114X_COMMAND, SI114X_RESET);
    delay(10);
    WriteByte(SI114X_HW_KEY, 0x17);
    delay(10);
}
/*  --------------------------------------------------------//
    write one byte into si114x's reg

*/
void SI114X::WriteByte(uint8_t Reg, uint8_t Value) {
    Wire.beginTransmission(SI114X_ADDR);
    Wire.write(Reg);
    Wire.write(Value);
    Wire.endTransmission();
}
/*  --------------------------------------------------------//
    read one byte data from si114x

*/
uint8_t SI114X::ReadByte(uint8_t Reg) {
    Wire.beginTransmission(SI114X_ADDR);
    Wire.write(Reg);
    Wire.endTransmission();
    Wire.requestFrom(SI114X_ADDR, 1);
    return Wire.read();
}
/*  --------------------------------------------------------//
    read half word(2 bytes) data from si114x

*/
uint16_t SI114X::ReadHalfWord(uint8_t Reg) {
    uint16_t Value;
    Wire.beginTransmission(SI114X_ADDR);
    Wire.write(Reg);
    Wire.endTransmission();
    Wire.requestFrom(SI114X_ADDR, 2);
    Value = Wire.read();
    Value |= (uint16_t)Wire.read() << 8;
    return Value;
}
/*  --------------------------------------------------------//
    read param data

*/
uint8_t SI114X::ReadParamData(uint8_t Reg) {
    WriteByte(SI114X_COMMAND, Reg | SI114X_QUERY);
    return ReadByte(SI114X_RD);
}
/*  --------------------------------------------------------//
    writ param data

*/
uint8_t SI114X::WriteParamData(uint8_t Reg, uint8_t Value) {
    //write Value into PARAMWR reg first
    WriteByte(SI114X_WR, Value);
    WriteByte(SI114X_COMMAND, Reg | SI114X_SET);
    //SI114X writes value out to PARAM_RD,read and confirm its right
    return ReadByte(SI114X_RD);
}

/*  --------------------------------------------------------//
    Read Visible Value

*/
uint16_t SI114X::ReadVisible(void) {
    return ReadHalfWord(SI114X_ALS_VIS_DATA0);
}
/*  --------------------------------------------------------//
    Read IR Value

*/
uint16_t SI114X::ReadIR(void) {
    return ReadHalfWord(SI114X_ALS_IR_DATA0);
}
/*  --------------------------------------------------------//
    Read Proximity Value

*/
uint16_t SI114X::ReadProximity(uint8_t PSn) {
    return ReadHalfWord(PSn);
}
/*  --------------------------------------------------------//
    Read UV Value
    this function is a int value ,but the real value must be div 100

*/
uint16_t SI114X::ReadUV(void) {
    return (ReadHalfWord(SI114X_AUX_DATA0_UVINDEX0));
}