/*********************************************************************************
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* Copyright: (C) 2019 LingYun IoT System Studio
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* All rights reserved.
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*
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* Filename: tsl2561.c
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* Description: This file is the Lux sensor TSL2561 API functions on RaspberryPi,
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* which connected to I2C-1
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*
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* Version: 1.0.0(04/07/19)
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* Author: Guo Wenxue <guowenxue@gmail.com>
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* ChangeLog: 1, Release initial version on "04/07/19 17:39:38"
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*
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********************************************************************************/
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#include <wiringPi.h>
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#include <wiringPiI2C.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <math.h>
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#include <errno.h>
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#include <time.h>
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#include "tsl2561.h"
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int tsl_fd = -1;
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static const int regs_addr[REG_COUNT]={DATA0LOW, DATA0HIGH, DATA1LOW, DATA1HIGH};
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int tsl2561_init(void)
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{
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if(tsl_fd > 0)
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return 0;
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tsl_fd = wiringPiI2CSetup(TSL2561_I2C_ADDR);
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if(tsl_fd < 0)
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{
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printf("TSL2561 I2C setup failure: %s\n", strerror(errno));
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}
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else
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{
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printf("TSL2561 initialise ok, tsl_fd=%d\n", tsl_fd);
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}
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return tsl_fd;
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}
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double tsl2561_get_lux(void)
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{
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int i;
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int reg_data[REG_COUNT];
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int chn0_data = 0;
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int chn1_data = 0;
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double div = 0.0;
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double lux = 0.0;
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/* Power up TSL2561 */
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wiringPiI2CWrite(tsl_fd, CONTROL_REG);
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wiringPiI2CWrite(tsl_fd, POWER_UP);
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delay(410); /* t(CONV) MAX 400ms */
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/* Read register Channel0 and channel1 data from register */
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for(i=0; i<REG_COUNT; i++)
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{
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wiringPiI2CWrite(tsl_fd, regs_addr[i]);
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reg_data[i] = wiringPiI2CRead(tsl_fd);
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//printf("write and read register: 0x%0x->%d\n", regs_addr[i], reg_data[i]);
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}
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chn0_data = reg_data[1]*256 + reg_data[0]; /* Channel0 = DATA0HIGH<<8 + DATA0LOW */
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chn1_data = reg_data[3]*256 + reg_data[2]; /* channel1 = DATA1HIGH<<8 + DATA1LOW */
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if( chn0_data<=0 || chn1_data<0 )
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{
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//printf("TSL2561 get date chn0_data[%d] chn1_data[%d]\n", chn0_data, chn1_data);
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lux = 0.0;
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goto OUT;
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}
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div = (double)chn1_data / (double)chn0_data;
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if( div>0 && div<=0.5 )
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lux = 0.304*chn0_data-0.062*chn0_data*pow(div,1.4);
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else if( div>0.5 && div<=0.61 )
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lux = 0.0224*chn0_data-0.031*chn1_data;
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else if( div>0.61 && div<=0.8 )
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lux = 0.0128*chn0_data-0.0153*chn1_data;
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else if( div>0.8 && div<=1.3 )
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lux = 0.00146*chn0_data-0.00112*chn1_data;
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else if( div>1.3 )
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lux = 0.0;
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OUT:
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printf("TSLl2561 get lux: %.3f\n", lux);
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wiringPiI2CWrite(tsl_fd, CONTROL_REG);
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wiringPiI2CWrite(tsl_fd, POWER_DOWN);
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return lux;
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}
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