master.cpp

00001 #include "master.h"
00002 
00003 I2C master (p28,p27);                      //configure pins p27,p28 as I2C master
00004 Serial pc (USBTX,USBRX);
00005 
00006 struct SensorData                          //HK_data_structure
00007 {
00008     char voltage[10];
00009     char current[10];
00010     char temp[10];
00011 } Sensor;
00012 
00013 void FUNC_I2C_MASTER_MAIN(char command, int slave_address, int iterations)
00014 {
00015     wait(0.5);
00016     printf("1\n");
00017     bool acknowledge1;
00018     bool acknowledge2;
00019     uint8_t loopvariable2=0;
00020     bool loopvariable1 = true;
00021     bool loopvariable3 = true;
00022     while(loopvariable1)
00023     {
00024 //-------------writing the command to slave--------------------------------------------------------------        
00025         printf("2\n");
00026         master.frequency(100000);                       //set clock frequency
00027         master.start();                                 //initiating the data transfer
00028         acknowledge2 = (bool) master.write(slave_address|0x00);           //addressing the slave to write
00029         if(acknowledge2)                             //proceeding further only if slave is addressed
00030         {
00031             printf("3\n");
00032         acknowledge1 = (bool) master.write(command);         //sending the command to slave 
00033         if(acknowledge1)                             //proceeding further only if sent data is acknowledged   
00034            {
00035                printf("acknowledge1=%d\n",acknowledge1);
00036                loopvariable1=false;                         //if acknowledged, breaking loop in next iteration
00037                
00038 //--------------reading data from slave---------------------------------------------------------------          
00039                while(loopvariable3)
00040                  {              
00041                     master.frequency(100000);                    //set clock frequency 
00042                     master.start();                              //initiate data transfer 
00043                     acknowledge1 = (bool) master.write(slave_address | 0x01);    //addressing the slave to read
00044                     
00045                     if(acknowledge1)                          //proceedong only if slae is addressed
00046                        {  
00047                        loopvariable3 = false;
00048                        while(loopvariable2<8)
00049                           { 
00050                               Sensor.voltage[loopvariable2] =  receive_byte();              //receiving data if acknowledged
00051                               printf(" voltage%d = %x\n",loopvariable2,Sensor.voltage[loopvariable2]);
00052                              
00053                               Sensor.current[loopvariable2] =  receive_byte();             //receiving data if acknowledged
00054                               printf(" current%d = %x\n",loopvariable2, Sensor.current[loopvariable2]);
00055                             
00056                               Sensor.temp[loopvariable2] =  receive_byte();                //receiving data if acknowledged
00057                               printf(" temperature%d = %x\n",loopvariable2,Sensor.temp[loopvariable2]);
00058                             
00059                               loopvariable2++;
00060                           
00061                           } //while(loopvariable2<30) 
00062                        }//if(acknowledge1==1)
00063                  
00064                     master.stop();
00065                  }//while(loopvariable3) 
00066             }//if(acknowledge1==1)   
00067         }//if(acknowledge2==1) 
00068      }//while(loopvariable1)
00069    printf("done");
00070 }//main
00071 
00072 
00073 //----------------function to read and return the data received-----------------------------------
00074 char receive_byte()                                    
00075 {
00076    
00077     char value;
00078     value = master.read(1);                     
00079     return(value);                              //returning the 4 byte floating point number  
00080 }
00081