green rosh / Mbed 2 deprecated i2c_slave_chaitanya

third commit

Dependencies:   mbed

Fork of i2c_slave by Chaitanya Viswa

slave.cpp@1:37d4026fa600, 2014-07-01 (annotated)

Committer:
greenroshks
Date:
Tue Jul 01 07:25:58 2014 +0000
Revision:
1:37d4026fa600
Parent:
0:ad4485166cfe 
second commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
viswachaitanya 0:ad4485166cfe 1 #include "slave.h"
greenroshks 1:37d4026fa600 2
greenroshks 1:37d4026fa600 3 SensorData Sensor;
greenroshks 1:37d4026fa600 4 I2CSlave slave(p28,p27); //configuring pins p27, p28 as I2Cslave
greenroshks 1:37d4026fa600 5 Serial pc (USBTX,USBRX);
viswachaitanya 0:ad4485166cfe 6 void write_to_master(char send) //function to write data to master
viswachaitanya 0:ad4485166cfe 7 {
viswachaitanya 0:ad4485166cfe 8 int acknowledge;
viswachaitanya 0:ad4485166cfe 9 acknowledge = slave.write(send); //sending the byte to master
viswachaitanya 0:ad4485166cfe 10 if(acknowledge==1)
viswachaitanya 0:ad4485166cfe 11 {
viswachaitanya 0:ad4485166cfe 12 pc.printf(" acknowledge %d sent %x \n",acknowledge,send);
viswachaitanya 0:ad4485166cfe 13 }
viswachaitanya 0:ad4485166cfe 14 }
viswachaitanya 0:ad4485166cfe 15
viswachaitanya 0:ad4485166cfe 16 void split(float data) //function to split data into 4 individual bytes and send to master
viswachaitanya 0:ad4485166cfe 17 {
viswachaitanya 0:ad4485166cfe 18 union convert
viswachaitanya 0:ad4485166cfe 19 {
viswachaitanya 0:ad4485166cfe 20 char byte[4]; //array containing individual bytes
viswachaitanya 0:ad4485166cfe 21 float number; //floating point number to be split into four bytes
viswachaitanya 0:ad4485166cfe 22 }v;
viswachaitanya 0:ad4485166cfe 23 v.number=data;
viswachaitanya 0:ad4485166cfe 24 write_to_master(v.byte[0]);
viswachaitanya 0:ad4485166cfe 25 write_to_master(v.byte[1]);
viswachaitanya 0:ad4485166cfe 26 write_to_master(v.byte[2]);
viswachaitanya 0:ad4485166cfe 27 write_to_master(v.byte[3]);
viswachaitanya 0:ad4485166cfe 28 pc.printf("sent %f\n",v.number);
viswachaitanya 0:ad4485166cfe 29 }
viswachaitanya 0:ad4485166cfe 30
viswachaitanya 0:ad4485166cfe 31
viswachaitanya 0:ad4485166cfe 32
viswachaitanya 0:ad4485166cfe 33 void FUNC_I2C_SLAVE_MAIN()
viswachaitanya 0:ad4485166cfe 34 {
viswachaitanya 0:ad4485166cfe 35 wait(0.5);
viswachaitanya 0:ad4485166cfe 36 slave.address(0x20); //assigning slave address
viswachaitanya 0:ad4485166cfe 37 int Switch_Variable;
viswachaitanya 0:ad4485166cfe 38 int ReadAddressed=1;
viswachaitanya 0:ad4485166cfe 39 int WriteGeneral=3;
viswachaitanya 0:ad4485166cfe 40 int loopvariable1=1;
viswachaitanya 0:ad4485166cfe 41 int loopvariable2=0;
viswachaitanya 0:ad4485166cfe 42 //initialising dummy sensor data
viswachaitanya 0:ad4485166cfe 43 Sensor.voltage[0]=0.1;Sensor.current[0]=0.0;Sensor.temp[0]=1.0;
viswachaitanya 0:ad4485166cfe 44 Sensor.voltage[1]=0.1;Sensor.current[1]=1.1;Sensor.temp[1]=2.0;
viswachaitanya 0:ad4485166cfe 45 Sensor.voltage[2]=0.2;Sensor.current[2]=2.2;Sensor.temp[2]=2.0;
viswachaitanya 0:ad4485166cfe 46 Sensor.voltage[3]=0.3;Sensor.current[3]=3.3;Sensor.temp[3]=3.0;
viswachaitanya 0:ad4485166cfe 47 Sensor.voltage[4]=0.4;Sensor.current[4]=4.4;Sensor.temp[4]=4.0;
viswachaitanya 0:ad4485166cfe 48 Sensor.voltage[5]=0.5;Sensor.current[5]=5.5;Sensor.temp[5]=5.0;
viswachaitanya 0:ad4485166cfe 49 Sensor.voltage[6]=0.6;Sensor.current[6]=6.6;Sensor.temp[6]=6.0;
viswachaitanya 0:ad4485166cfe 50 Sensor.voltage[7]=0.7;Sensor.current[7]=7.7;Sensor.temp[7]=7.0;
viswachaitanya 0:ad4485166cfe 51 Sensor.voltage[8]=0.8;Sensor.current[8]=8.8;Sensor.temp[8]=8.0;
viswachaitanya 0:ad4485166cfe 52 Sensor.voltage[9]=0.9;Sensor.current[9]=9.9;Sensor.temp[9]=20.5;
viswachaitanya 0:ad4485166cfe 53 while(loopvariable1)
viswachaitanya 0:ad4485166cfe 54 {
viswachaitanya 0:ad4485166cfe 55 //to read data from master
viswachaitanya 0:ad4485166cfe 56 if(slave.receive()==WriteGeneral) //checking if slave is addressed to write
viswachaitanya 0:ad4485166cfe 57 {
viswachaitanya 0:ad4485166cfe 58 Switch_Variable=slave.read(); //receiving data
viswachaitanya 0:ad4485166cfe 59 pc.printf("switch variable=%d\n",Switch_Variable);
viswachaitanya 0:ad4485166cfe 60 slave.stop(); //reset slave to default receiving state
viswachaitanya 0:ad4485166cfe 61 loopvariable1=0;
viswachaitanya 0:ad4485166cfe 62 //to interpret and write data to master
viswachaitanya 0:ad4485166cfe 63 switch(Switch_Variable)
viswachaitanya 0:ad4485166cfe 64 {
viswachaitanya 0:ad4485166cfe 65
viswachaitanya 0:ad4485166cfe 66 case 1: while(loopvariable2<30)
viswachaitanya 0:ad4485166cfe 67 {
viswachaitanya 0:ad4485166cfe 68 if(slave.receive()==ReadAddressed) //check if slave is addressed to read
viswachaitanya 0:ad4485166cfe 69 {
viswachaitanya 0:ad4485166cfe 70 if(loopvariable2%3==0)
viswachaitanya 0:ad4485166cfe 71 {
viswachaitanya 0:ad4485166cfe 72 pc.printf("\nvoltage%d\n",loopvariable2/3);
viswachaitanya 0:ad4485166cfe 73 split(Sensor.voltage[loopvariable2/3]);
viswachaitanya 0:ad4485166cfe 74 }
viswachaitanya 0:ad4485166cfe 75 else if(loopvariable2%3==1)
viswachaitanya 0:ad4485166cfe 76 {
viswachaitanya 0:ad4485166cfe 77 pc.printf("\ncurrent%d\n",loopvariable2/3);
viswachaitanya 0:ad4485166cfe 78 split(Sensor.current[loopvariable2/3]);
viswachaitanya 0:ad4485166cfe 79 }
viswachaitanya 0:ad4485166cfe 80 else if(loopvariable2%3==2)
viswachaitanya 0:ad4485166cfe 81 {
viswachaitanya 0:ad4485166cfe 82 pc.printf("\ntemp%d\n",loopvariable2/3);
viswachaitanya 0:ad4485166cfe 83 split(Sensor.temp[loopvariable2/3]);
viswachaitanya 0:ad4485166cfe 84 }
viswachaitanya 0:ad4485166cfe 85 loopvariable2++;
viswachaitanya 0:ad4485166cfe 86 slave.stop();
viswachaitanya 0:ad4485166cfe 87 }
viswachaitanya 0:ad4485166cfe 88 }
viswachaitanya 0:ad4485166cfe 89 break;
viswachaitanya 0:ad4485166cfe 90 case 2 : pc.printf(" telecommand 2\n");
viswachaitanya 0:ad4485166cfe 91 break;
viswachaitanya 0:ad4485166cfe 92
viswachaitanya 0:ad4485166cfe 93 }//switch case ends
viswachaitanya 0:ad4485166cfe 94 }
viswachaitanya 0:ad4485166cfe 95 }
viswachaitanya 0:ad4485166cfe 96 pc.printf("done");
viswachaitanya 0:ad4485166cfe 97 }