main.cpp

00001 #include "mbed.h"
00002 
00003 #define MLX90614_ADDR   (0x5A)          // Slave address
00004 #define MLX90614_TOBJ   (0x07)          // Object temperature register
00005 
00006 DigitalOut  led(D13);                   //link leg
00007 I2C         i2c(D14, D15);              //I2C reg(SDA, SCL)
00008 Serial      pc(D1, D0);                 //Serial reg
00009 Ticker      TT;                             //call a timer
00010 
00011 char    data_write[1];                  //buff for write
00012 char    data_read [3];                  //buff for read
00013 short   Buff = 0x00;
00014 float   TOBJ = 0.0;
00015 void    read_MLX();
00016 
00017 int main()
00018 {
00019     led = 0;
00020     pc.baud(9600);                      //set baud rate
00021     i2c.frequency(100000);              //100kHz
00022     read_MLX();                         //update MLX data
00023     TOBJ = ((float)Buff * 0.02f) - 273.0f;
00024     printf("%.2f\n",TOBJ);
00025 }
00026 
00027 
00028 void read_MLX(void)                     //read MLX data give raw data
00029 {
00030     led = 1;
00031     //TOBJ
00032     data_write[0] = MLX90614_TOBJ;      //TOBJ address to buff
00033     i2c.write( MLX90614_ADDR<<1 | 0x00, data_write, 1, 1);  //command to RAM access SR activated
00034     i2c.read ( MLX90614_ADDR<<1 | 0x01, data_read , 3, 0);  //read callback
00035     Buff  =  data_read[1] << 8;         // merging
00036     Buff |=  data_read[0];
00037     led = 0;
00038 }