Chaitanya Vanapalli / Mbed 2 deprecated rtos_cdms_trash

for checking i2c with integrated bae

Dependencies:   SDFileSystem mbed-rtos mbed

master.cpp@0:cb112a717428, 2014-09-15 (annotated)

Committer:
viswa_chaitanya
Date:
Mon Sep 15 14:01:49 2014 +0000
Revision:
0:cb112a717428
cdms master(hk runs every 20s)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
viswa_chaitanya 0:cb112a717428 1 #include "master.h"
viswa_chaitanya 0:cb112a717428 2
viswa_chaitanya 0:cb112a717428 3 I2C master (A4,A5); //configure pins p27,p28 as I2C master
viswa_chaitanya 0:cb112a717428 4 Serial pc (USBTX,USBRX);
viswa_chaitanya 0:cb112a717428 5 SensorData Sensor;
viswa_chaitanya 0:cb112a717428 6
viswa_chaitanya 0:cb112a717428 7 void FUNC_I2C_MASTER_MAIN(int command, int slave_address, int iterations)
viswa_chaitanya 0:cb112a717428 8 {
viswa_chaitanya 0:cb112a717428 9 //wait(0.5);
viswa_chaitanya 0:cb112a717428 10 printf("\nmaster entered\n");
viswa_chaitanya 0:cb112a717428 11 int acknowledge1;
viswa_chaitanya 0:cb112a717428 12 int acknowledge2;
viswa_chaitanya 0:cb112a717428 13 uint8_t loopvariable1=1,loopvariable2=0;
viswa_chaitanya 0:cb112a717428 14 int addr = slave_address;
viswa_chaitanya 0:cb112a717428 15 while(loopvariable1)
viswa_chaitanya 0:cb112a717428 16 {
viswa_chaitanya 0:cb112a717428 17 printf("\nmaster entered loop \n");
viswa_chaitanya 0:cb112a717428 18 //-------------writing the command to slave--------------------------------------------------------------
viswa_chaitanya 0:cb112a717428 19 master.frequency(100000); //set clock frequency
viswa_chaitanya 0:cb112a717428 20 master.start(); //initiating the data transfer
viswa_chaitanya 0:cb112a717428 21 acknowledge2=master.write(addr|0x00); //addressing the slave to write
viswa_chaitanya 0:cb112a717428 22 if(acknowledge2==1) //proceeding further only if slave is addressed
viswa_chaitanya 0:cb112a717428 23 {
viswa_chaitanya 0:cb112a717428 24 // printf("\nmaster entered 1 \n");
viswa_chaitanya 0:cb112a717428 25 acknowledge1=master.write(command); //sending the command to slave
viswa_chaitanya 0:cb112a717428 26 if(acknowledge1==1) //proceeding further only if sent data is acknowledged
viswa_chaitanya 0:cb112a717428 27 {
viswa_chaitanya 0:cb112a717428 28 pc.printf("acknowledge1=%d\n",acknowledge1);
viswa_chaitanya 0:cb112a717428 29 loopvariable1=0; //if acknowledged, breaking loop in next iteration
viswa_chaitanya 0:cb112a717428 30 //--------------reading data from slave---------------------------------------------------------------
viswa_chaitanya 0:cb112a717428 31
viswa_chaitanya 0:cb112a717428 32 master.frequency(100000); //set clock frequency
viswa_chaitanya 0:cb112a717428 33 master.start(); //initiate data transfer
viswa_chaitanya 0:cb112a717428 34 acknowledge1 = master.write(addr | 0x01); //addressing the slave to read
viswa_chaitanya 0:cb112a717428 35
viswa_chaitanya 0:cb112a717428 36 if(acknowledge1==1) //proceedong only if slae is addressed
viswa_chaitanya 0:cb112a717428 37 {
viswa_chaitanya 0:cb112a717428 38 while(loopvariable2<iterations)
viswa_chaitanya 0:cb112a717428 39 {
viswa_chaitanya 0:cb112a717428 40 if(loopvariable2%3==0)
viswa_chaitanya 0:cb112a717428 41 {
viswa_chaitanya 0:cb112a717428 42 Sensor.voltage[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
viswa_chaitanya 0:cb112a717428 43 pc.printf(" voltage%d = %u\n",loopvariable2/3,Sensor.voltage[loopvariable2/3]);
viswa_chaitanya 0:cb112a717428 44 }
viswa_chaitanya 0:cb112a717428 45 else if(loopvariable2%3==1)
viswa_chaitanya 0:cb112a717428 46 {
viswa_chaitanya 0:cb112a717428 47 Sensor.current[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
viswa_chaitanya 0:cb112a717428 48 pc.printf(" current%d = %u\n",loopvariable2/3, Sensor.current[loopvariable2/3]);
viswa_chaitanya 0:cb112a717428 49 }
viswa_chaitanya 0:cb112a717428 50 else if(loopvariable2%3==2)
viswa_chaitanya 0:cb112a717428 51 {
viswa_chaitanya 0:cb112a717428 52 Sensor.temp[loopvariable2/3] = receive_byte(); //receiving data if acknowledged
viswa_chaitanya 0:cb112a717428 53 pc.printf(" temperature%d = %u\n",loopvariable2/3,Sensor.temp[loopvariable2/3]);
viswa_chaitanya 0:cb112a717428 54 }
viswa_chaitanya 0:cb112a717428 55 loopvariable2++;
viswa_chaitanya 0:cb112a717428 56
viswa_chaitanya 0:cb112a717428 57 } //while(loopvariable2<30)
viswa_chaitanya 0:cb112a717428 58 }//if(acknowledge1==1)
viswa_chaitanya 0:cb112a717428 59
viswa_chaitanya 0:cb112a717428 60 master.stop();
viswa_chaitanya 0:cb112a717428 61 }//if(acknowledge1==1)
viswa_chaitanya 0:cb112a717428 62 }//if(acknowledge2==1)
viswa_chaitanya 0:cb112a717428 63 }//while(loopvariable1)
viswa_chaitanya 0:cb112a717428 64 pc.printf("done");
viswa_chaitanya 0:cb112a717428 65 printf("\nMaster exited\n");
viswa_chaitanya 0:cb112a717428 66 }//main
viswa_chaitanya 0:cb112a717428 67
viswa_chaitanya 0:cb112a717428 68
viswa_chaitanya 0:cb112a717428 69 //----------------function to read and return the data received-----------------------------------
viswa_chaitanya 0:cb112a717428 70 char receive_byte()
viswa_chaitanya 0:cb112a717428 71 {
viswa_chaitanya 0:cb112a717428 72
viswa_chaitanya 0:cb112a717428 73 char value;
viswa_chaitanya 0:cb112a717428 74 value = master.read(1);
viswa_chaitanya 0:cb112a717428 75 return(value); //returning the 4 byte floating point number
viswa_chaitanya 0:cb112a717428 76 }