Chaitanya Viswa
/
i2c_master
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
diff -r 000000000000 -r 7811fb22b3de master.cpp --- /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
diff -r 000000000000 -r 7811fb22b3de master.h --- /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
diff -r 000000000000 -r 7811fb22b3de mbed.bld --- /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