1  // SPDX-FileCopyrightText: 2019 Anne Barela for Adafruit Industries
  2  //
  3  // SPDX-License-Identifier: MIT
  4  
  5  #include "Arduino.h"
  6  #include "Wire.h"
  7  
  8  #include "Adafruit_VCNL4000.h"
  9  
 10  
 11  bool Adafruit_VCNL4000::begin() {
 12    Wire.begin();
 13  
 14    // Check VCNL4000 product ID and fail if not expected value.
 15    uint8_t rev = read8(VCNL4000_PRODUCTID);
 16    if ((rev & 0xF0) != 0x10) {
 17      return false;
 18    }
 19      
 20    // Set IR LED current to 200mA.
 21    write8(VCNL4000_IRLED, 20);        // set to 20 * 10mA = 200mA
 22  
 23    // Set proximity adjustment value.
 24    write8(VCNL4000_PROXINITYADJUST, 0x81);
 25  
 26    return true;
 27  }
 28  
 29  uint16_t Adafruit_VCNL4000::readProximity() {
 30    write8(VCNL4000_COMMAND, VCNL4000_MEASUREPROXIMITY);
 31    while (1) {
 32      uint8_t result = read8(VCNL4000_COMMAND);
 33      //Serial.print("Ready = 0x"); Serial.println(result, HEX);
 34      if (result & VCNL4000_PROXIMITYREADY) {
 35        return read16(VCNL4000_PROXIMITYDATA);
 36      }
 37      delay(1);
 38    }
 39  }
 40  
 41  // Read 1 byte from the VCNL4000 at 'address'
 42  uint8_t Adafruit_VCNL4000::read8(uint8_t address)
 43  {
 44    uint8_t data;
 45  
 46    Wire.beginTransmission(VCNL4000_ADDRESS);
 47  #if ARDUINO >= 100
 48    Wire.write(address);
 49  #else
 50    Wire.send(address);
 51  #endif
 52    Wire.endTransmission();
 53  
 54    delayMicroseconds(170);  // delay required
 55  
 56    Wire.requestFrom(VCNL4000_ADDRESS, 1);
 57    while(!Wire.available());
 58  
 59  #if ARDUINO >= 100
 60    return Wire.read();
 61  #else
 62    return Wire.receive();
 63  #endif
 64  }
 65  
 66  
 67  // Read 2 byte from the VCNL4000 at 'address'
 68  uint16_t Adafruit_VCNL4000::read16(uint8_t address)
 69  {
 70    uint16_t data;
 71  
 72    Wire.beginTransmission(VCNL4000_ADDRESS);
 73  #if ARDUINO >= 100
 74    Wire.write(address);
 75  #else
 76    Wire.send(address);
 77  #endif
 78    Wire.endTransmission();
 79  
 80    Wire.requestFrom(VCNL4000_ADDRESS, 2);
 81    while(!Wire.available());
 82  #if ARDUINO >= 100
 83    data = Wire.read();
 84    data <<= 8;
 85    while(!Wire.available());
 86    data |= Wire.read();
 87  #else
 88    data = Wire.receive();
 89    data <<= 8;
 90    while(!Wire.available());
 91    data |= Wire.receive();
 92  #endif
 93    
 94    return data;
 95  }
 96  
 97  // write 1 byte
 98  void Adafruit_VCNL4000::write8(uint8_t address, uint8_t data)
 99  {
100    Wire.beginTransmission(VCNL4000_ADDRESS);
101  #if ARDUINO >= 100
102    Wire.write(address);
103    Wire.write(data);  
104  #else
105    Wire.send(address);
106    Wire.send(data);  
107  #endif
108    Wire.endTransmission();
109  }