Chaitanya Viswa
i2c master header file
Revision 0:7811fb22b3de, committed 2014-06-30
- Comitter:
- viswachaitanya
- Date:
- Mon Jun 30 11:55:18 2014 +0000
- Commit message:
- m.h version1
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/master.cpp Mon Jun 30 11:55:18 2014 +0000
@@ -0,0 +1,70 @@
+#include "master.h"
+
+float receive_byte() //function to read and print the data received
+{
+ union join
+ {
+ char byte[4]; //array containing individual bytes
+ float number; //floating point number to be appended
+ }append;
+ float value;
+ append.byte[0]=master.read(1); //reading individual bytes and storing it in array
+ pc.printf("\n(1) %x\n",append.byte[0]);
+ append.byte[1]=master.read(1);
+ pc.printf("(2) %x\n",append.byte[1]);
+ append.byte[2]=master.read(1);
+ pc.printf("(3) %x\n",append.byte[2]);
+ append.byte[3]=master.read(1);
+ pc.printf("(4) %x\n",append.byte[3]);
+ value = append.number;
+ return(value); //returning the 4 byte floating point number
+}
+
+void FUNC_I2C_MASTER_MAIN()
+{
+ int acknowledge;
+ int loopvariable1=1,loopvariable2=0;
+ while(loopvariable1)
+ {
+ //writing the command to slave
+ master.frequency(100000); //set clock frequency
+ master.start(); //initiating the data transfer
+ master.write(addr|0x00); //addressing the slave to write
+ acknowledge=master.write(get_hk_data); //sending the command to slave
+ if(acknowledge==1)
+ {
+ pc.printf("acknowledge=%d\n",acknowledge);
+ loopvariable1=0; //if acknowledged, breaking loop in next iteration
+ //reading 4 byte data from slave
+ while(loopvariable2<30)
+ {
+ master.frequency(100000); //set clock frequency
+ master.start(); //initiate data transfer
+ acknowledge = master.write(addr | 0x01); //addressing the slave to read
+ if(acknowledge==1)
+ {
+ //pc.printf("enter\n");
+ if(loopvariable2%3==0)
+ {
+ Sensor.voltage[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
+ pc.printf(" voltage%d = %f\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 = %f\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 = %f\n",loopvariable2/3,Sensor.temp[loopvariable2/3]);
+ }
+
+ loopvariable2++;
+ }//if(acknowledge==1)
+ } //while(loopvariable2<30)
+ master.stop();
+ }//if(acknowledge==1)
+ }//while(loopvariable1)
+ pc.printf("done");
+}//main
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/master.h Mon Jun 30 11:55:18 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 master
+Serial pc (USBTX,USBRX);
+
+const int addr = 0x20; //slave address
+float receive_byte();
+void FUNC_I2C_MASTER_MAIN();
+
+struct SensorData
+{
+ float voltage[10];
+ float current[10];
+ float temp[10];
+ //float Battery[2];
+} Sensor;
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Jun 30 11:55:18 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/024bf7f99721 \ No newline at end of file