/********************************************************************************* * 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 * ChangeLog: 1, Release initial version on "04/07/19 17:39:38" * ********************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #define TSL2561_I2C_ADDR 0x39 #define CONTROL_REG 0x80 #define REG_COUNT 4 #define POWER_UP 0x03 #define POWER_DOWN 0x00 /* Register Address */ enum { /* Channel_0 = DATA0HIGH<<8 + DATA0LOW */ DATA0LOW = 0x8C, DATA0HIGH, /* Channel_1 = DATA1HIGH<<8 + DATA1LOW */ DATA1LOW, DATA1HIGH, }; int tsl_fd = -1; static const int regs_addr[REG_COUNT]={DATA0LOW, DATA0HIGH, DATA1LOW, DATA1HIGH}; #define msleep(x) usleep( 1000*(x) ) int tsl2561_init(void) { if(tsl_fd > 0) return 0; if( (tsl_fd=open("/dev/i2c-1", O_RDWR)) < 0) { printf("TSL2561 I2C device setup failure: %s\n", strerror(errno)); return -1; } printf("TSL2561 initialise ok, tsl_fd=%d\n", tsl_fd); return tsl_fd; } #define ON 1 #define OFF 0 void tsl2561_power(int cmd) { struct i2c_msg msg; struct i2c_rdwr_ioctl_data data; unsigned char buf[2]; msg.addr= TSL2561_I2C_ADDR; msg.flags=0; /* write */ msg.len= 1; msg.buf= buf; data.nmsgs= 1; data.msgs= &msg; msg.buf[0]=CONTROL_REG; if( ioctl(tsl_fd, I2C_RDWR, &data) < 0 ) { printf("%s() ioctl failure: %s\n", __func__, strerror(errno)); return ; } if( cmd ) msg.buf[0]=POWER_UP; else msg.buf[0]=POWER_DOWN; if( ioctl(tsl_fd, I2C_RDWR, &data) < 0 ) { printf("%s() ioctl failure: %s\n", __func__, strerror(errno)); return ; } return ; } int tsl2561_readreg(unsigned char regaddr, unsigned char *regval) { struct i2c_msg msg; struct i2c_rdwr_ioctl_data data; unsigned char buf[2]; msg.addr= TSL2561_I2C_ADDR; msg.flags=0; /* write */ msg.len= 1; msg.buf= buf; msg.buf[0] = regaddr; data.nmsgs= 1; data.msgs= &msg; if( ioctl(tsl_fd, I2C_RDWR, &data) < 0 ) { printf("%s() ioctl failure: %s\n", __func__, strerror(errno)); return -1; } memset(buf, 0, sizeof(buf)); msg.addr= TSL2561_I2C_ADDR; msg.flags=I2C_M_RD; /* read */ msg.len= 1; msg.buf= buf; data.nmsgs= 1; data.msgs= &msg; if( ioctl(tsl_fd, I2C_RDWR, &data) < 0 ) { printf("%s() ioctl failure: %s\n", __func__, strerror(errno)); return -1; } *regval = msg.buf[0]; return 0; } int tsl2561_get_lux(void) { int i; unsigned char reg_data[REG_COUNT]; unsigned char buf; int chn0_data = 0; int chn1_data = 0; float div = 0.0; float lux = 0.0; tsl2561_power(ON); msleep(410); /* t(CONV) MAX 400ms */ /* Read register Channel0 and channel1 data from register */ for(i=0; i0 && 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); tsl2561_power(OFF); } void print_datime(void) { time_t tmp; struct tm *p; time(&tmp); p=localtime(&tmp); printf("%d-%02d-%02d %02d:%02d:%02d\t", (p->tm_year+1900),(p->tm_mon+1), p->tm_mday, p->tm_hour, p->tm_min, p->tm_sec); } int main(int argc, char **argv) { int interval = 1; if( argc >= 2 ) { interval = atoi(argv[1]); } tsl2561_init(); while(1) { print_datime(); tsl2561_get_lux(); sleep(interval); } }