Diff: main.cpp

Revision:

0:fca1e63ed338

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Jun 12 11:39:22 2016 +0000
@@ -0,0 +1,126 @@
+#include "mbed.h"
+
+const int addr=0xD0;
+unsigned char var1,var2,var3,var4,var5,var6;
+int i;
+
+Serial pc(USBTX, USBRX, "pc");
+
+I2C i2c(p28, p27); 
+
+void read_rtc_sec()
+{  
+    i2c.start();   
+    i2c.write(0xD0);
+    i2c.write(0x00);
+          
+    i2c.start();
+    i2c.write(0xD1);
+    var1=i2c.read(0x00);
+  
+    var2=var1;
+    var1=var1&0x0f;
+    var2=var2>>4;
+    i2c.stop();
+      
+    }
+
+void read_rtc_min()
+{  
+    i2c.start();  
+    i2c.write(0xD0);
+    i2c.write(0x01);
+ 
+    i2c.start();
+    i2c.write(0xD1);
+    var3=i2c.read(0x00);    
+    
+    var4=var3;
+    var3=var3&0x0f;
+    var4=var4>>4;
+
+    i2c.stop();
+    }
+
+
+void read_rtc_hrs()
+{  
+    i2c.start();  
+    i2c.write(0xD0);
+    i2c.write(0x02);
+        
+    i2c.start();
+    i2c.write(0xD1);
+    var5=i2c.read(0x00);    
+
+    var6=var5;
+    var5=var5&0x0f;
+    var6=var6>>4;
+    var6=var6&0x01;
+ 
+    i2c.stop();
+    }
+    
+void write_rtc_min(unsigned char mn)
+{
+    i2c.start();
+    i2c.write(addr);
+    i2c.write(0x01);
+    i2c.write(mn); //write min
+    i2c.stop();
+   
+}
+
+ void write_rtc_sec(unsigned char sc)
+ {
+    i2c.start();
+    i2c.write(addr);
+    i2c.write(0x00);
+    i2c.write(sc); // write sec 
+    i2c.stop();
+  }
+  
+
+void write_rtc_hrs(unsigned char hr)  
+{    
+    i2c.start();
+    i2c.write(addr);
+    i2c.write(0x02);
+    i2c.write(hr); //write hrs
+    i2c.stop();
+         
+    }
+
+
+int main() 
+{
+
+char sec=0x45; // second field value
+char min=0x59; // min field value
+char hrs=0x52; // hrs field value 
+    
+    
+    i2c.frequency(100000);
+    i2c.start();
+    wait(1);
+    
+    i2c.start();
+    write_rtc_min(min);
+    write_rtc_sec(sec);
+    write_rtc_hrs(hrs);
+
+ 
+    
+    while(1)
+    {
+    read_rtc_hrs();
+    read_rtc_min();
+    read_rtc_sec();
+ 
+    pc.printf("Current time = (%d%d:%d%d:%d%d)\n\r",var6,var5,var4,var3,var2,var1);
+    
+    wait(1);
+     
+    }
+    
+     }
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