Diff: main.cpp

Revision:

1:2d9d32fc4f5d

Parent:

0:81fa0e3e8a6c

Child:

2:3d70a9ba2a58

--- a/main.cpp	Mon Nov 09 13:39:59 2015 +0000
+++ b/main.cpp	Tue Nov 10 13:25:36 2015 +0000
@@ -1,17 +1,20 @@
 #include "mbed.h"
   
-         //SDA , SCL
-I2C i2cBus(PB_9, PB_8);
+I2C i2cBus(I2C_SDA, I2C_SCL);
  
 int main()
 {
-        i2cBus.frequency(100000);
-                        
-        //Scan the valid I2C addresrange: 0x3 to 0x77
-        for (int i2cAddres=3; i2cAddres<=0x77; i2cAddres++) {
-            if (!i2cBus.write(i2cAddres<<1, NULL, 0)) {   // 0 if  a device ACK'ed the message
-                printf("\r\nI2C device found at address 0x%02X                 \r\n", i2cAddres);
-            }
-        }
+       i2cBus.frequency(100000);
+       
+       int i2cAddres=0x68;                // Address of DS1307 is 0x68 (7 bit address)
+       int i2c8BitAddres= i2cAddres <<1;  // Convert to 8bit addressing used by mbed 
+    
+       int result=i2cBus.write(i2c8BitAddres, NULL, 0);  
+        
+        //0 on success (ack), non-0 on failure (nack)                  
+       if (result==0)   
+            printf("I2C device found at address 0x%02X             \r\n", i2cAddres);
+        else
+            printf("I2C device Not found at address 0x%02X         \r\n", i2cAddres);              
 }