Diff: main.cpp

Revision:

1:60bb79c9a01e

Parent:

0:b325845b05af

Child:

2:3e6b509d7eca

diff -r b325845b05af -r 60bb79c9a01e main.cpp
--- a/main.cpp	Mon Jan 14 17:27:19 2013 +0000
+++ b/main.cpp	Mon Jan 14 18:05:34 2013 +0000
@@ -9,40 +9,47 @@
 {
     int temp = 0;
     int a,b,c;
-    
-    
-    wait(1);
-    
     char cmd[2];
     
+    wait(1);           //Make sure system is fully initialized
+    
     while(1) {
-        pc.printf("\r\n\nStart of read Temperature\r\n");
+        pc.printf("\r\n\nStart reading the temperature of TC74 on I2C\r\n");
         
         //Méthode 1
-        
-        i2c.start();            // 
-        a = i2c.write(addr);
-        b = i2c.write(0x00);
+        //Utilisation des fonctions bas niveau
         
-        wait(0.07);
-        
-        i2c.start();
+        i2c.start();            // Start condition
+        a = i2c.write(addr);    // Write Device Address
+        b = i2c.write(0x00);    // Write READ command of TC74 (voir page 8 de la datasheet du TC74)
+
+        i2c.start();            //Reissue start condition
+                                //Au lieu de faire Stop condition et Start de nouveau
         
-        c= i2c.write(addr|1);
-        temp = i2c.read(0);
-        i2c.stop();
+        c= i2c.write(addr|1);   //Adresse du Device en mode Lecture
+        temp = i2c.read(0);     //Lecture de la valeur du registre de température
+        i2c.stop();             //Fermeture de la trame
         
         //Méthode 2
+        //Utilisation des fonctions haut niveau
+
+        cmd[0] = 0x0;               //Command :: READ
+        cmd[1] = 0x0;               //Param :: Unused in this case
+        i2c.write(addr, cmd, 1);    //Issue required command to perform a write of the command
+        i2c.read(addr, cmd, 1);     //Read the Data from the device
         
-        cmd[0] = 0x0;
-        cmd[1] = 0x0;
-        i2c.write(addr, cmd, 1);
-        i2c.read(addr, cmd, 1); 
+        //-----------------Print out section ----------------------
+        //Display device Address and informations
+        pc.printf("Device with address 0x%x with\r\n", addr);
         
-        pc.printf("Device at %d is reading %d degree\r\n", addr, cmd[0]);
+        //Prints out the result of Method 1
+        //pc.printf("ACK1 :: %d\n\rACK2 :: %d\n\rACK3 :: %d\n\r", a,b,c); //ACK bits
+        pc.printf("Method 1 :: %d\n\r", temp);
+        
+        //Prints out the Data from Method 2
+        pc.printf("Method 1 :: %d\r\n\n", cmd[0]);
 
-        pc.printf("ACK1 :: %d\n\rACK2 :: %d\n\rACK3 :: %d\n\r", a,b,c);
-        pc.printf("Temp :: %d\n\r", temp);
+        
         wait(1);
     }
 }
\ No newline at end of file