Diff: mlx90614.cpp

Revision:

1:4a60d3f1e91e

Child:

2:01d333d06727

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mlx90614.cpp	Thu Jun 09 13:07:40 2011 +0000
@@ -0,0 +1,45 @@
+ 
+#include "mlx90614.h"
+
+MLX90614::MLX90614(I2C* i2c,int addr){
+
+    this->i2caddress = addr;
+    this->i2c = i2c; 
+    
+}
+
+
+bool MLX90614::getTemp(float* temp_val){
+
+    char p1,p2,p3;
+    float temp_thermo;
+    bool ch;
+
+    i2c->stop();                            //stop i2c if not ack
+    wait(0.01);
+    i2c->start();                           //start I2C                   
+    ch=i2c->write(i2caddress);              //device address with write condition
+    
+    if(!ch)return false;                    //No Ack, return False
+    
+    ch=i2c->write(0x07);                    //device ram address where Tobj value is present
+
+    if(!ch)return false;                    //No Ack, return False
+
+
+    i2c->start();                           //repeat start
+    ch=i2c->write(i2caddress|0x01);         //device address with read condition 
+    if(!ch)return false;                    //No Ack, return False
+
+    p1=i2c->read(1);     //Tobj low byte
+    p2=i2c->read(1);     //Tobj heigh byte
+    p3=i2c->read(0);     //PEC
+    
+    i2c->stop();                            //stop condition
+     
+    
+    temp_thermo=((((p2&0x007f)<<8)+p1)*0.02)-0.01;      //degree centigrate conversion
+    *temp_val=temp_thermo-273;                          //Convert kelvin to degree Celsius
+    
+    return true;                            //load data successfully, return true 
+}
\ No newline at end of file