Chaitanya Viswa / Mbed 2 deprecated _i2c_master

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Dependencies:   mbed

Fork of i2c_master by green rosh

master.cpp@2:c1387cf55c7d, 2014-07-17 (annotated)

Committer:
viswachaitanya
Date:
Thu Jul 17 11:23:58 2014 +0000
Revision:
2:c1387cf55c7d
Parent:
1:14b369c0f314 
i2c master test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
viswachaitanya 0:7811fb22b3de 1 #include "master.h"
greenroshks 1:14b369c0f314 2
greenroshks 1:14b369c0f314 3 I2C master (p28,p27); //configure pins p27,p28 as I2C master
greenroshks 1:14b369c0f314 4 Serial pc (USBTX,USBRX);
greenroshks 1:14b369c0f314 5 SensorData Sensor;
greenroshks 1:14b369c0f314 6
greenroshks 1:14b369c0f314 7 void FUNC_I2C_MASTER_MAIN(int command, int slave_address, int iterations)
viswachaitanya 0:7811fb22b3de 8 {
viswachaitanya 2:c1387cf55c7d 9 wait(0.5);
greenroshks 1:14b369c0f314 10 printf("\nmaster entered\n");
greenroshks 1:14b369c0f314 11 int acknowledge1;
greenroshks 1:14b369c0f314 12 int acknowledge2;
greenroshks 1:14b369c0f314 13 uint8_t loopvariable1=1,loopvariable2=0;
greenroshks 1:14b369c0f314 14 int addr = slave_address;
viswachaitanya 0:7811fb22b3de 15 while(loopvariable1)
viswachaitanya 0:7811fb22b3de 16 {
viswachaitanya 2:c1387cf55c7d 17 printf("\nmaster entered loop \n");
greenroshks 1:14b369c0f314 18 //-------------writing the command to slave--------------------------------------------------------------
greenroshks 1:14b369c0f314 19 master.frequency(100000); //set clock frequency
greenroshks 1:14b369c0f314 20 master.start(); //initiating the data transfer
greenroshks 1:14b369c0f314 21 acknowledge2=master.write(addr|0x00); //addressing the slave to write
greenroshks 1:14b369c0f314 22 if(acknowledge2==1) //proceeding further only if slave is addressed
greenroshks 1:14b369c0f314 23 {
viswachaitanya 2:c1387cf55c7d 24 // printf("\nmaster entered 1 \n");
greenroshks 1:14b369c0f314 25 acknowledge1=master.write(command); //sending the command to slave
viswachaitanya 2:c1387cf55c7d 26 if(acknowledge1==1) //proceeding further only if sent data is acknowledged
viswachaitanya 0:7811fb22b3de 27 {
greenroshks 1:14b369c0f314 28 pc.printf("acknowledge1=%d\n",acknowledge1);
greenroshks 1:14b369c0f314 29 loopvariable1=0; //if acknowledged, breaking loop in next iteration
greenroshks 1:14b369c0f314 30 //--------------reading data from slave---------------------------------------------------------------
greenroshks 1:14b369c0f314 31
greenroshks 1:14b369c0f314 32 master.frequency(100000); //set clock frequency
greenroshks 1:14b369c0f314 33 master.start(); //initiate data transfer
greenroshks 1:14b369c0f314 34 acknowledge1 = master.write(addr | 0x01); //addressing the slave to read
greenroshks 1:14b369c0f314 35
greenroshks 1:14b369c0f314 36 if(acknowledge1==1) //proceedong only if slae is addressed
greenroshks 1:14b369c0f314 37 {
greenroshks 1:14b369c0f314 38 while(loopvariable2<iterations)
greenroshks 1:14b369c0f314 39 {
viswachaitanya 0:7811fb22b3de 40 if(loopvariable2%3==0)
viswachaitanya 0:7811fb22b3de 41 {
greenroshks 1:14b369c0f314 42 Sensor.voltage[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
greenroshks 1:14b369c0f314 43 pc.printf(" voltage%d = %u\n",loopvariable2/3,Sensor.voltage[loopvariable2/3]);
viswachaitanya 0:7811fb22b3de 44 }
viswachaitanya 0:7811fb22b3de 45 else if(loopvariable2%3==1)
viswachaitanya 0:7811fb22b3de 46 {
greenroshks 1:14b369c0f314 47 Sensor.current[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
greenroshks 1:14b369c0f314 48 pc.printf(" current%d = %u\n",loopvariable2/3, Sensor.current[loopvariable2/3]);
viswachaitanya 0:7811fb22b3de 49 }
viswachaitanya 0:7811fb22b3de 50 else if(loopvariable2%3==2)
viswachaitanya 0:7811fb22b3de 51 {
greenroshks 1:14b369c0f314 52 Sensor.temp[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
greenroshks 1:14b369c0f314 53 pc.printf(" temperature%d = %u\n",loopvariable2/3,Sensor.temp[loopvariable2/3]);
viswachaitanya 0:7811fb22b3de 54 }
viswachaitanya 0:7811fb22b3de 55 loopvariable2++;
greenroshks 1:14b369c0f314 56
greenroshks 1:14b369c0f314 57 } //while(loopvariable2<30)
greenroshks 1:14b369c0f314 58 }//if(acknowledge1==1)
greenroshks 1:14b369c0f314 59
viswachaitanya 0:7811fb22b3de 60 master.stop();
greenroshks 1:14b369c0f314 61 }//if(acknowledge1==1)
greenroshks 1:14b369c0f314 62 }//if(acknowledge2==1)
viswachaitanya 0:7811fb22b3de 63 }//while(loopvariable1)
viswachaitanya 0:7811fb22b3de 64 pc.printf("done");
greenroshks 1:14b369c0f314 65 printf("\nMaster exited\n");
greenroshks 1:14b369c0f314 66 }//main
greenroshks 1:14b369c0f314 67
greenroshks 1:14b369c0f314 68
greenroshks 1:14b369c0f314 69 //----------------function to read and return the data received-----------------------------------
greenroshks 1:14b369c0f314 70 char receive_byte()
greenroshks 1:14b369c0f314 71 {
greenroshks 1:14b369c0f314 72
greenroshks 1:14b369c0f314 73 char value;
greenroshks 1:14b369c0f314 74 value = master.read(1);
greenroshks 1:14b369c0f314 75 return(value); //returning the 4 byte floating point number
greenroshks 1:14b369c0f314 76 }