| | |
| | | * |
| | | ********************************************************************************/ |
| | | |
| | | #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 <time.h> |
| | | |
| | | #include "tsl2561.h" |
| | | #include <sys/ioctl.h> |
| | | #include <linux/i2c.h> |
| | | #include <linux/i2c-dev.h> |
| | | #include <sys/types.h> |
| | | #include <sys/stat.h> |
| | | #include <fcntl.h> |
| | | |
| | | #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; |
| | | |
| | | tsl_fd = wiringPiI2CSetup(TSL2561_I2C_ADDR); |
| | | if(tsl_fd < 0) |
| | | if( (tsl_fd=open("/dev/i2c-1", O_RDWR)) < 0) |
| | | { |
| | | printf("TSL2561 I2C setup failure: %s\n", strerror(errno)); |
| | | } |
| | | else |
| | | { |
| | | printf("TSL2561 initialise ok, tsl_fd=%d\n", tsl_fd); |
| | | 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; |
| | | int reg_data[REG_COUNT]; |
| | | unsigned char reg_data[REG_COUNT]; |
| | | unsigned char buf; |
| | | |
| | | 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); |
| | | float div = 0.0; |
| | | float lux = 0.0; |
| | | |
| | | sleep(1); |
| | | |
| | | tsl2561_power(ON); |
| | | |
| | | msleep(410); /* t(CONV) MAX 400ms */ |
| | | |
| | | /* 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]); |
| | | tsl2561_readreg(regs_addr[i], ®_data[i]); |
| | | } |
| | | |
| | | chn0_data = reg_data[1]*256 + reg_data[0]; /* Channel0 = DATA0HIGH<<8 + DATA0LOW */ |
| | |
| | | |
| | | 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; |
| | | div = (float)chn1_data / (float)chn0_data; |
| | | |
| | | if( div>0 && div<=0.5 ) |
| | | lux = 0.304*chn0_data-0.062*chn0_data*pow(div,1.4); |
| | |
| | | OUT: |
| | | printf("TSLl2561 get lux: %.3f\n", lux); |
| | | |
| | | wiringPiI2CWrite(tsl_fd, CONTROL_REG); |
| | | wiringPiI2CWrite(tsl_fd, POWER_DOWN); |
| | | 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) |
| | | { |
| | |
| | | |
| | | while(1) |
| | | { |
| | | print_datime(); |
| | | tsl2561_get_lux(); |
| | | sleep(interval); |
| | | } |