/* Digital_Light_TSL2561.cpp A library for TSL2561 Copyright (c) 2012 seeed technology inc. Website : www.seeed.cc Author : zhangkun Create Time: Change Log : Jack Shao, Nov 2014, bug fix and update for user experience 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 #include #include TSL2561_CalculateLux::TSL2561_CalculateLux(uint32_t read_timeout) : read_timeout(read_timeout) { } uint8_t TSL2561_CalculateLux::readRegister(int deviceAddress, int address) { uint8_t value; Wire.beginTransmission(deviceAddress); Wire.write(address); // register to read Wire.endTransmission(); Wire.requestFrom(deviceAddress, 1); // read a byte uint32_t readStart = micros(); while (!Wire.available()) { if (read_timeout != TSL2561_NO_READ_TIMEOUT && micros() - readStart >= read_timeout) { hadTimeout = true; break; } } value = Wire.read(); //delay(100); return value; } void TSL2561_CalculateLux::writeRegister(int deviceAddress, int address, uint8_t val) { Wire.beginTransmission(deviceAddress); // start transmission to device Wire.write(address); // send register address Wire.write(val); // send value to write Wire.endTransmission(); // end transmission //delay(100); } void TSL2561_CalculateLux::getLux(void) { CH0_LOW = readRegister(TSL2561_Address, TSL2561_Channal0L); CH0_HIGH = readRegister(TSL2561_Address, TSL2561_Channal0H); //read two bytes from registers 0x0E and 0x0F CH1_LOW = readRegister(TSL2561_Address, TSL2561_Channal1L); CH1_HIGH = readRegister(TSL2561_Address, TSL2561_Channal1H); ch0 = (CH0_HIGH << 8) | CH0_LOW; ch1 = (CH1_HIGH << 8) | CH1_LOW; } void TSL2561_CalculateLux::init() { writeRegister(TSL2561_Address, TSL2561_Control, 0x03); // POWER UP writeRegister(TSL2561_Address, TSL2561_Timing, 0x00); //No High Gain (1x), integration time of 13ms writeRegister(TSL2561_Address, TSL2561_Interrupt, 0x00); writeRegister(TSL2561_Address, TSL2561_Control, 0x00); // POWER Down } uint16_t TSL2561_CalculateLux::readIRLuminosity() { // read Infrared channel value only, not convert to lux. writeRegister(TSL2561_Address, TSL2561_Control, 0x03); // POWER UP delay(14); getLux(); writeRegister(TSL2561_Address, TSL2561_Control, 0x00); // POWER Down if (ch1 == 0) { return 0; } if (ch0 / ch1 < 2 && ch0 > 4900) { return -1; //ch0 out of range, but ch1 not. the lux is not valid in this situation. } return ch1; } uint16_t TSL2561_CalculateLux::readFSpecLuminosity() { //read Full Spectrum channel value only, not convert to lux. writeRegister(TSL2561_Address, TSL2561_Control, 0x03); // POWER UP delay(14); getLux(); writeRegister(TSL2561_Address, TSL2561_Control, 0x00); // POWER Down if (ch1 == 0) { return 0; } if (ch0 / ch1 < 2 && ch0 > 4900) { return -1; //ch0 out of range, but ch1 not. the lux is not valid in this situation. } return ch0; } signed long TSL2561_CalculateLux::readVisibleLux() { writeRegister(TSL2561_Address, TSL2561_Control, 0x03); // POWER UP delay(14); getLux(); writeRegister(TSL2561_Address, TSL2561_Control, 0x00); // POWER Down if (ch1 == 0) { return 0; } if (ch0 / ch1 < 2 && ch0 > 4900) { return -1; //ch0 out of range, but ch1 not. the lux is not valid in this situation. } return calculateLux(0, 0, 0); //T package, no gain, 13ms } unsigned long TSL2561_CalculateLux::calculateLux(unsigned int iGain, unsigned int tInt, int iType) { switch (tInt) { case 0: // 13.7 msec chScale = CHSCALE_TINT0; break; case 1: // 101 msec chScale = CHSCALE_TINT1; break; default: // assume no scaling chScale = (1 << CH_SCALE); break; } if (!iGain) { chScale = chScale << 4; // scale 1X to 16X } // scale the channel values channel0 = (ch0 * chScale) >> CH_SCALE; channel1 = (ch1 * chScale) >> CH_SCALE; ratio1 = 0; if (channel0 != 0) { ratio1 = (channel1 << (RATIO_SCALE + 1)) / channel0; } // round the ratio value unsigned long ratio = (ratio1 + 1) >> 1; switch (iType) { case 0: // T package if ((ratio >= 0) && (ratio <= K1T)) { b = B1T; m = M1T; } else if (ratio <= K2T) { b = B2T; m = M2T; } else if (ratio <= K3T) { b = B3T; m = M3T; } else if (ratio <= K4T) { b = B4T; m = M4T; } else if (ratio <= K5T) { b = B5T; m = M5T; } else if (ratio <= K6T) { b = B6T; m = M6T; } else if (ratio <= K7T) { b = B7T; m = M7T; } else if (ratio > K8T) { b = B8T; m = M8T; } break; case 1:// CS package if ((ratio >= 0) && (ratio <= K1C)) { b = B1C; m = M1C; } else if (ratio <= K2C) { b = B2C; m = M2C; } else if (ratio <= K3C) { b = B3C; m = M3C; } else if (ratio <= K4C) { b = B4C; m = M4C; } else if (ratio <= K5C) { b = B5C; m = M5C; } else if (ratio <= K6C) { b = B6C; m = M6C; } else if (ratio <= K7C) { b = B7C; m = M7C; } } temp = ((channel0 * b) - (channel1 * m)); if (temp < 0) { temp = 0; } temp += (1 << (LUX_SCALE - 1)); // strip off fractional portion lux = temp >> LUX_SCALE; return (lux); } bool TSL2561_CalculateLux::checkHadTimeout(){ bool timeout = hadTimeout; hadTimeout = false; return timeout; } TSL2561_CalculateLux TSL2561;