Chaitanya Viswa
/
xmasterv2
v2i2c master receiving 4 bit data from slave
Fork of xmaster by
Diff: master.cpp
- Revision:
- 0:e96ddb4b964e
- Child:
- 1:35dee3eff0ab
diff -r 000000000000 -r e96ddb4b964e master.cpp --- /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 +}