Chaitanya Viswa
/
_i2c_master
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Fork of
i2c_master
by 
green rosh
Revision 1:14b369c0f314, committed 2014-07-15
- Comitter:
- greenroshks
- Date:
- Tue Jul 15 10:06:29 2014 +0000
- Parent:
- 0:7811fb22b3de
- Child:
- 2:c1387cf55c7d
- Commit message:
- Master final
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Jul 15 10:06:29 2014 +0000
@@ -0,0 +1,10 @@
+#include "master.h"
+
+int main()
+{
+ while(true)
+ {
+ FUNC_I2C_MASTER_MAIN(1,0x20,24);
+ wait(23);
+ }
+}
\ No newline at end of file
--- a/master.cpp Mon Jun 30 11:55:18 2014 +0000
+++ b/master.cpp Tue Jul 15 10:06:29 2014 +0000
@@ -1,70 +1,73 @@
#include "master.h"
-
-float receive_byte() //function to read and print the data received
+
+I2C master (p28,p27); //configure pins p27,p28 as I2C master
+Serial pc (USBTX,USBRX);
+SensorData Sensor;
+
+void FUNC_I2C_MASTER_MAIN(int command, int slave_address, int iterations)
{
- 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;
+ printf("\nmaster entered\n");
+ int acknowledge1;
+ int acknowledge2;
+ uint8_t 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
- master.write(addr|0x00); //addressing the slave to write
- acknowledge=master.write(get_hk_data); //sending the command to slave
- if(acknowledge==1)
+//-------------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("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");
+ 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 = %f\n",loopvariable2/3,Sensor.voltage[loopvariable2/3]);
+ Sensor.voltage[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
+ pc.printf(" voltage%d = %u\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]);
+ Sensor.current[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
+ pc.printf(" current%d = %u\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]);
+ Sensor.temp[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
+ pc.printf(" temperature%d = %u\n",loopvariable2/3,Sensor.temp[loopvariable2/3]);
}
-
loopvariable2++;
- }//if(acknowledge==1)
- } //while(loopvariable2<30)
+
+ } //while(loopvariable2<30)
+ }//if(acknowledge1==1)
+
master.stop();
- }//if(acknowledge==1)
+ }//if(acknowledge1==1)
+ }//if(acknowledge2==1)
}//while(loopvariable1)
pc.printf("done");
-}//main
\ No newline at end of file
+printf("\nMaster exited\n");
+}//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
+}
\ No newline at end of file
--- a/master.h Mon Jun 30 11:55:18 2014 +0000
+++ b/master.h Tue Jul 15 10:06:29 2014 +0000
@@ -1,25 +1,22 @@
#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);
+#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'
-const int addr = 0x20; //slave address
-float receive_byte();
-void FUNC_I2C_MASTER_MAIN();
-
-struct SensorData
+char receive_byte(); //funtion to receive float data
+
+
+struct SensorData //HK_data_structure
{
- float voltage[10];
- float current[10];
- float temp[10];
- //float Battery[2];
-} Sensor;
\ No newline at end of file
+ char voltage[10];
+ char current[10];
+ char temp[10];
+} ;
+void FUNC_I2C_MASTER_MAIN(int command, int slave_address, int iterations);
\ No newline at end of file