Revision 0:e96ddb4b964e, committed 2014-07-05

Comitter:

viswachaitanya

Date:

Sat Jul 05 06:40:06 2014 +0000

Commit message:

i2cmaster receiving 4 bit data from slave

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/master.cpp	Sat Jul 05 06:40:06 2014 +0000
@@ -0,0 +1,67 @@
+#include "master.h"
+
+void FUNC_I2C_MASTER_MAIN(int command, int slave_address, int iterations)
+{
+    int acknowledge1;
+    int acknowledge2;
+    int loopvariable1=1,loopvariable2=0;
+    int addr = slave_address;
+    while(loopvariable1)
+    {
+//-------------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
+        {
+        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 = %x\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 = %x\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 = %x\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");
+}//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  
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/master.h	Sat Jul 05 06:40:06 2014 +0000
@@ -0,0 +1,25 @@
+#include "mbed.h"                          //library                                              //
+#define get_hk_data 1                      //sample telecommands
+#define telecommand2 2
+#define telecommand3 3
+#define telecommand4 4
+#define telecommand5 5
+#define telecommand6 6
+#define telecommand7 7
+#define telecommand8 8
+#define telecommand9 9 
+#define telecommand10 10
+I2C master (p28,p27);                      //configure pins p27,p28 as I2C master
+Serial pc (USBTX,USBRX);
+
+//const int addr = 0x20;                     //slave address 
+char receive_byte();                      //funtion to receive float data 
+
+
+struct SensorData                          //HK_data_structure
+{
+    char voltage[5];
+    char current[5];
+    char temp[5];
+} Sensor;
+void FUNC_I2C_MASTER_MAIN(int command, int slave_address, int iterations);
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sat Jul 05 06:40:06 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/04dd9b1680ae
\ No newline at end of file