Chaitanya Viswa
/
xmasterv2
v2i2c master receiving 4 bit data from slave
Fork of xmaster by
master.cpp@0:e96ddb4b964e, 2014-07-05 (annotated)
- Committer:
- viswachaitanya
- Date:
- Sat Jul 05 06:40:06 2014 +0000
- Revision:
- 0:e96ddb4b964e
- Child:
- 1:35dee3eff0ab
i2cmaster receiving 4 bit data from slave
Who changed what in which revision?
User | Revision | Line number | New 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 | } |