Chaitanya Viswa
/
i2c_slave
i2c slave program
slave.cpp
- Committer:
- viswachaitanya
- Date:
- 2014-06-30
- Revision:
- 0:ad4485166cfe
File content as of revision 0:ad4485166cfe:
#include "slave.h" void write_to_master(char send) //function to write data to master { int acknowledge; acknowledge = slave.write(send); //sending the byte to master if(acknowledge==1) { pc.printf(" acknowledge %d sent %x \n",acknowledge,send); } } void split(float data) //function to split data into 4 individual bytes and send to master { union convert { char byte[4]; //array containing individual bytes float number; //floating point number to be split into four bytes }v; v.number=data; write_to_master(v.byte[0]); write_to_master(v.byte[1]); write_to_master(v.byte[2]); write_to_master(v.byte[3]); pc.printf("sent %f\n",v.number); } void FUNC_I2C_SLAVE_MAIN() { wait(0.5); slave.address(0x20); //assigning slave address int Switch_Variable; int ReadAddressed=1; int WriteGeneral=3; int loopvariable1=1; int loopvariable2=0; //initialising dummy sensor data Sensor.voltage[0]=0.1;Sensor.current[0]=0.0;Sensor.temp[0]=1.0; Sensor.voltage[1]=0.1;Sensor.current[1]=1.1;Sensor.temp[1]=2.0; Sensor.voltage[2]=0.2;Sensor.current[2]=2.2;Sensor.temp[2]=2.0; Sensor.voltage[3]=0.3;Sensor.current[3]=3.3;Sensor.temp[3]=3.0; Sensor.voltage[4]=0.4;Sensor.current[4]=4.4;Sensor.temp[4]=4.0; Sensor.voltage[5]=0.5;Sensor.current[5]=5.5;Sensor.temp[5]=5.0; Sensor.voltage[6]=0.6;Sensor.current[6]=6.6;Sensor.temp[6]=6.0; Sensor.voltage[7]=0.7;Sensor.current[7]=7.7;Sensor.temp[7]=7.0; Sensor.voltage[8]=0.8;Sensor.current[8]=8.8;Sensor.temp[8]=8.0; Sensor.voltage[9]=0.9;Sensor.current[9]=9.9;Sensor.temp[9]=20.5; while(loopvariable1) { //to read data from master if(slave.receive()==WriteGeneral) //checking if slave is addressed to write { Switch_Variable=slave.read(); //receiving data pc.printf("switch variable=%d\n",Switch_Variable); slave.stop(); //reset slave to default receiving state loopvariable1=0; //to interpret and write data to master switch(Switch_Variable) { case 1: while(loopvariable2<30) { if(slave.receive()==ReadAddressed) //check if slave is addressed to read { if(loopvariable2%3==0) { pc.printf("\nvoltage%d\n",loopvariable2/3); split(Sensor.voltage[loopvariable2/3]); } else if(loopvariable2%3==1) { pc.printf("\ncurrent%d\n",loopvariable2/3); split(Sensor.current[loopvariable2/3]); } else if(loopvariable2%3==2) { pc.printf("\ntemp%d\n",loopvariable2/3); split(Sensor.temp[loopvariable2/3]); } loopvariable2++; slave.stop(); } } break; case 2 : pc.printf(" telecommand 2\n"); break; }//switch case ends } } pc.printf("done"); }