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