Chaitanya Viswa / Mbed 2 deprecated xmaster

i2c master receiving 4 bit data from slave

Dependencies:   mbed

master.cpp@0:e96ddb4b964e, 2014-07-05 (annotated)

Committer:
viswachaitanya
Date:
Sat Jul 05 06:40:06 2014 +0000
Revision:
0:e96ddb4b964e
i2cmaster receiving 4 bit data from slave

Who changed what in which revision?

UserRevisionLine numberNew contents of line
viswachaitanya 0:e96ddb4b964e 1 #include "master.h"
viswachaitanya 0:e96ddb4b964e 2
viswachaitanya 0:e96ddb4b964e 3 void FUNC_I2C_MASTER_MAIN(int command, int slave_address, int iterations)
viswachaitanya 0:e96ddb4b964e 4 {
viswachaitanya 0:e96ddb4b964e 5 int acknowledge1;
viswachaitanya 0:e96ddb4b964e 6 int acknowledge2;
viswachaitanya 0:e96ddb4b964e 7 int loopvariable1=1,loopvariable2=0;
viswachaitanya 0:e96ddb4b964e 8 int addr = slave_address;
viswachaitanya 0:e96ddb4b964e 9 while(loopvariable1)
viswachaitanya 0:e96ddb4b964e 10 {
viswachaitanya 0:e96ddb4b964e 11 //-------------writing the command to slave--------------------------------------------------------------
viswachaitanya 0:e96ddb4b964e 12 master.frequency(100000); //set clock frequency
viswachaitanya 0:e96ddb4b964e 13 master.start(); //initiating the data transfer
viswachaitanya 0:e96ddb4b964e 14 acknowledge2=master.write(addr|0x00); //addressing the slave to write
viswachaitanya 0:e96ddb4b964e 15 if(acknowledge2==1) //proceeding further only if slave is addressed
viswachaitanya 0:e96ddb4b964e 16 {
viswachaitanya 0:e96ddb4b964e 17 acknowledge1=master.write(command); //sending the command to slave
viswachaitanya 0:e96ddb4b964e 18 if(acknowledge1==1) //proceeding further only if sent data is acknowledged
viswachaitanya 0:e96ddb4b964e 19 {
viswachaitanya 0:e96ddb4b964e 20 pc.printf("acknowledge1=%d\n",acknowledge1);
viswachaitanya 0:e96ddb4b964e 21 loopvariable1=0; //if acknowledged, breaking loop in next iteration
viswachaitanya 0:e96ddb4b964e 22 //--------------reading data from slave---------------------------------------------------------------
viswachaitanya 0:e96ddb4b964e 23
viswachaitanya 0:e96ddb4b964e 24 master.frequency(100000); //set clock frequency
viswachaitanya 0:e96ddb4b964e 25 master.start(); //initiate data transfer
viswachaitanya 0:e96ddb4b964e 26 acknowledge1 = master.write(addr | 0x01); //addressing the slave to read
viswachaitanya 0:e96ddb4b964e 27
viswachaitanya 0:e96ddb4b964e 28 if(acknowledge1==1) //proceedong only if slae is addressed
viswachaitanya 0:e96ddb4b964e 29 {
viswachaitanya 0:e96ddb4b964e 30 while(loopvariable2<iterations)
viswachaitanya 0:e96ddb4b964e 31 {
viswachaitanya 0:e96ddb4b964e 32 if(loopvariable2%3==0)
viswachaitanya 0:e96ddb4b964e 33 {
viswachaitanya 0:e96ddb4b964e 34 Sensor.voltage[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
viswachaitanya 0:e96ddb4b964e 35 pc.printf(" voltage%d = %x\n",loopvariable2/3,Sensor.voltage[loopvariable2/3]);
viswachaitanya 0:e96ddb4b964e 36 }
viswachaitanya 0:e96ddb4b964e 37 else if(loopvariable2%3==1)
viswachaitanya 0:e96ddb4b964e 38 {
viswachaitanya 0:e96ddb4b964e 39 Sensor.current[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
viswachaitanya 0:e96ddb4b964e 40 pc.printf(" current%d = %x\n",loopvariable2/3, Sensor.current[loopvariable2/3]);
viswachaitanya 0:e96ddb4b964e 41 }
viswachaitanya 0:e96ddb4b964e 42 else if(loopvariable2%3==2)
viswachaitanya 0:e96ddb4b964e 43 {
viswachaitanya 0:e96ddb4b964e 44 Sensor.temp[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
viswachaitanya 0:e96ddb4b964e 45 pc.printf(" temperature%d = %x\n",loopvariable2/3,Sensor.temp[loopvariable2/3]);
viswachaitanya 0:e96ddb4b964e 46 }
viswachaitanya 0:e96ddb4b964e 47 loopvariable2++;
viswachaitanya 0:e96ddb4b964e 48
viswachaitanya 0:e96ddb4b964e 49 } //while(loopvariable2<30)
viswachaitanya 0:e96ddb4b964e 50 }//if(acknowledge1==1)
viswachaitanya 0:e96ddb4b964e 51
viswachaitanya 0:e96ddb4b964e 52 master.stop();
viswachaitanya 0:e96ddb4b964e 53 }//if(acknowledge1==1)
viswachaitanya 0:e96ddb4b964e 54 }//if(acknowledge2==1)
viswachaitanya 0:e96ddb4b964e 55 }//while(loopvariable1)
viswachaitanya 0:e96ddb4b964e 56 pc.printf("done");
viswachaitanya 0:e96ddb4b964e 57 }//main
viswachaitanya 0:e96ddb4b964e 58
viswachaitanya 0:e96ddb4b964e 59
viswachaitanya 0:e96ddb4b964e 60 //----------------function to read and return the data received-----------------------------------
viswachaitanya 0:e96ddb4b964e 61 char receive_byte()
viswachaitanya 0:e96ddb4b964e 62 {
viswachaitanya 0:e96ddb4b964e 63
viswachaitanya 0:e96ddb4b964e 64 char value;
viswachaitanya 0:e96ddb4b964e 65 value = master.read(1);
viswachaitanya 0:e96ddb4b964e 66 return(value); //returning the 4 byte floating point number
viswachaitanya 0:e96ddb4b964e 67 }