Diff: master.cpp

Revision:

0:cb112a717428

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/master.cpp	Mon Sep 15 14:01:49 2014 +0000
@@ -0,0 +1,76 @@
+#include "master.h"
+ 
+I2C master (A4,A5);                      //configure pins p27,p28 as I2C master
+Serial pc (USBTX,USBRX);
+SensorData Sensor;
+  
+void FUNC_I2C_MASTER_MAIN(int command, int slave_address, int iterations)
+{
+    //wait(0.5);
+    printf("\nmaster entered\n");
+    int acknowledge1;
+    int acknowledge2;
+    uint8_t loopvariable1=1,loopvariable2=0;
+    int addr = slave_address;
+    while(loopvariable1)
+    {
+        printf("\nmaster entered loop \n");
+//-------------writing the command to slave--------------------------------------------------------------        
+        master.frequency(100000);                       //set clock frequency
+        master.start();                                 //initiating the data transfer
+        acknowledge2=master.write(addr|0x00);           //addressing the slave to write
+        if(acknowledge2==1)                             //proceeding further only if slave is addressed
+        {
+   //       printf("\nmaster entered 1 \n");
+        acknowledge1=master.write(command);         //sending the command to slave 
+      if(acknowledge1==1)                             //proceeding further only if sent data is acknowledged   
+           {
+               pc.printf("acknowledge1=%d\n",acknowledge1);
+               loopvariable1=0;                         //if acknowledged, breaking loop in next iteration
+//--------------reading data from slave---------------------------------------------------------------          
+               
+                    master.frequency(100000);                    //set clock frequency 
+                    master.start();                              //initiate data transfer 
+                    acknowledge1 = master.write(addr | 0x01);    //addressing the slave to read
+                    
+                    if(acknowledge1==1)                          //proceedong only if slae is addressed
+                       {  
+                       while(loopvariable2<iterations)
+                        { 
+                          if(loopvariable2%3==0)
+                            {
+                              Sensor.voltage[loopvariable2/3] =  receive_byte();              //receiving data if acknowledged
+                              pc.printf(" voltage%d = %u\n",loopvariable2/3,Sensor.voltage[loopvariable2/3]);
+                            }
+                          else if(loopvariable2%3==1)
+                            {  
+                              Sensor.current[loopvariable2/3] =  receive_byte();             //receiving data if acknowledged
+                              pc.printf(" current%d = %u\n",loopvariable2/3, Sensor.current[loopvariable2/3]);
+                            }
+                          else if(loopvariable2%3==2)
+                            {
+                              Sensor.temp[loopvariable2/3] =  receive_byte();                //receiving data if acknowledged
+                              pc.printf(" temperature%d = %u\n",loopvariable2/3,Sensor.temp[loopvariable2/3]);
+                            }
+                          loopvariable2++;
+                          
+                         } //while(loopvariable2<30) 
+                       }//if(acknowledge1==1)
+                 
+              master.stop();
+           }//if(acknowledge1==1)   
+        }//if(acknowledge2==1) 
+     }//while(loopvariable1)
+   pc.printf("done");
+printf("\nMaster exited\n");
+}//main
+ 
+ 
+//----------------function to read and return the data received-----------------------------------
+char receive_byte()                                    
+{
+   
+    char value;
+    value = master.read(1);                     
+    return(value);                              //returning the 4 byte floating point number  
+}
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