Diff: slave.cpp

Revision:

2:1792c9cda669

Child:

3:307c56629df0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/slave.cpp	Fri Jul 04 11:30:40 2014 +0000
@@ -0,0 +1,90 @@
+#include "slave.h"
+#include "HK.h"
+
+extern SensorData Sensor;
+I2CSlave slave(p28,p27);                       //configuring pins p27, p28 as I2Cslave
+Serial screen (USBTX,USBRX);
+void write_to_master(char send)                           //function to write data to master
+        {
+           int acknowledge; 
+           acknowledge = slave.write(send);    //sending the byte to master
+           if(acknowledge==1)
+            {
+              screen.printf(" acknowledge %d sent %x \n",acknowledge,send);
+            }
+        }
+        
+ void split(float data)                      //function to split data into 4 individual bytes and send to master
+        {
+            union convert
+              {              
+                   char byte[4];             //array containing individual bytes
+                   float number;             //floating point number to be split into four bytes 
+              }v;
+              v.number=data; 
+              write_to_master(v.byte[0]);
+              write_to_master(v.byte[1]);
+              write_to_master(v.byte[2]);
+              write_to_master(v.byte[3]);
+              screen.printf("sent %f\n",v.number);
+        }
+
+
+
+void FUNC_I2C_SLAVE_MAIN()
+{
+    wait(0.5);
+    screen.printf("\nSlave entered\n");
+    slave.address(0x20);                           //assigning slave address
+    int Switch_Variable;
+    int ReadAddressed=1;
+    int WriteGeneral=3;
+    int loopvariable1=1;
+    int loopvariable2=0;
+//initialising dummy sensor data                         
+    
+    while(loopvariable1)
+    { 
+//to read data from master       
+    if(slave.receive()==WriteGeneral)                   //checking if slave is addressed to write
+    {
+      Switch_Variable=slave.read();                   //receiving data
+      screen.printf("switch variable=%d\n",Switch_Variable);
+      slave.stop();                          //reset slave to default receiving state
+      loopvariable1=0;
+//to interpret and write data to master       
+      switch(Switch_Variable)
+      {
+      
+       case 1: while(loopvariable2<30)
+                {
+                     if(slave.receive()==ReadAddressed)             //check if slave is addressed to read 
+                   {
+                      if(loopvariable2%3==0)
+                          {
+                          screen.printf("\nvoltage%d\n",loopvariable2/3);
+                          split(Sensor.Voltage[loopvariable2/3]);
+                          }
+                      else if(loopvariable2%3==1)
+                          {   
+                          screen.printf("\ncurrent%d\n",loopvariable2/3);
+                          split(Sensor.Current[loopvariable2/3]);
+                          }
+                      else if(loopvariable2%3==2)
+                          {   
+                          screen.printf("\ntemp%d\n",loopvariable2/3);
+                          split(Sensor.Temp[loopvariable2/3]);
+                          }         
+                      loopvariable2++;
+                      slave.stop();      
+                    }
+                  }
+                  break;
+         case 2 : screen.printf(" telecommand 2\n");
+                  break;         
+                 
+        }//switch case ends
+   }   
+}
+   screen.printf("done");
+}