Diff: slave.cpp

Revision:

0:cbe0ea884289

Child:

3:9b597ed04ef4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/slave.cpp	Thu Jul 10 11:35:40 2014 +0000
@@ -0,0 +1,98 @@
+#include "slave.h"
+SensorData Sensor;
+I2CSlave slave(p28,p27);                       //configuring pins p27, p28 as I2Cslave
+Serial green(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)
+            {
+              green.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]);
+              green.printf("sent %f\n",v.number);
+        }
+
+
+
+void FUNC_I2C_SLAVE_MAIN()
+{
+    wait(0.5);
+    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                         
+//    SensorData Sensor;
+    Sensor.voltage[0]=0.1;Sensor.current[0]=0.0;Sensor.temp[0]=1.0;
+    Sensor.voltage[1]=0.1;Sensor.current[1]=1.1;Sensor.temp[1]=2.0;
+    Sensor.voltage[2]=0.2;Sensor.current[2]=2.2;Sensor.temp[2]=2.0;
+    Sensor.voltage[3]=0.3;Sensor.current[3]=3.3;Sensor.temp[3]=3.0;
+    Sensor.voltage[4]=0.4;Sensor.current[4]=4.4;Sensor.temp[4]=4.0;
+    Sensor.voltage[5]=0.5;Sensor.current[5]=5.5;Sensor.temp[5]=5.0;
+    Sensor.voltage[6]=0.6;Sensor.current[6]=6.6;Sensor.temp[6]=6.0;
+    Sensor.voltage[7]=0.7;Sensor.current[7]=7.7;Sensor.temp[7]=7.0;
+    Sensor.voltage[8]=0.8;Sensor.current[8]=8.8;Sensor.temp[8]=8.0;
+    Sensor.voltage[9]=0.9;Sensor.current[9]=9.9;Sensor.temp[9]=20.5;
+    while(loopvariable1)
+    { 
+//to read data from master       
+    if(slave.receive()==WriteGeneral)                   //checking if slave is addressed to write
+    {
+      Switch_Variable=slave.read();                   //receiving data
+      green.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)
+                          {
+                          green.printf("\nvoltage%d\n",loopvariable2/3);
+                          split(Sensor.voltage[loopvariable2/3]);
+                          }
+                      else if(loopvariable2%3==1)
+                          {   
+                          green.printf("\ncurrent%d\n",loopvariable2/3);
+                          split(Sensor.current[loopvariable2/3]);
+                          }
+                      else if(loopvariable2%3==2)
+                          {   
+                          green.printf("\ntemp%d\n",loopvariable2/3);
+                          split(Sensor.temp[loopvariable2/3]);
+                          }         
+                      loopvariable2++;
+                      slave.stop();      
+                    }
+                  }
+                  break;
+         case 2 : green.printf(" telecommand 2\n");
+                  break;         
+                 
+        }//switch case ends
+   }   
+}
+   green.printf("done");
+}