Read the sensor data on switch

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June 6th, 2011, 12:36 AM

embed_v

Registered User

Join Date: Aug 2010

Posts: 3

Time spent in forums: 1 h 25 m 51 sec
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Read the sensor data on switch

hii this my code :

my logic is that i have to read the current sensor data on appropriate dip sw.
for that i define the structure for sensor ,also int Read_sensor_id(int Dip_Switch) for to read sensor data on sw.
but when i complied the err occoured:

Error: L6200E: Symbol infor multiply defined (by delay.o and commands.o).
Error: L6200E: Symbol infor multiply defined (by i2c.o and commands.o).
Error: L6200E: Symbol infor multiply defined (by sensor.o and commands.o).

i think logic is ok but somthing wrg in structure....?????????

Code:


struct sensor
{
	U8 sensr_id;
	U8 opto_read;
	 
}infor;

int Read_sensor_id(int Dip_Switch)
{
	int sensor_id;
       Dip_Switch = DIP_SWITCH;    //4bit dipsw
	switch (Dip_Switch)
	{
	case 0:
		sensor_id = SENSOR_ID0;
		break;

	case 1:
		sensor_id = SENSOR_ID1;
		break;
	case 2:
		sensor_id = SENSOR_ID2; 

	default:
		sensor_id = -1; 
	break;
	}

	return sensor_id;
}

int Read_sensor_current_id(int curr_id)
{
	curr_id =  Read_Cassette_id(infor.sensr_id);

	return curr_id; 
}

June 7th, 2011, 04:34 PM

OmegaZero

Contributing User

Join Date: May 2007

Posts: 737

Time spent in forums: 3 Weeks 5 Days 12 m 37 sec
Reputation Power: 928

It sounds like you've defined the "infor" structure in every one your .c files. You need the structure type definition and an 'extern' declaration in a header, then define the variable in only one c file.

For example

Code:

/* data.h */
struct data_type {
    int field;
};

extern struct data_type data;

Code:

/* data.c */
#include "data.h"

struct data_type data;

void get_data() {
   data.field = 1;
}

Code:

/* main.c */
#include "data.h"

void use_data() {
   int value = data.field;
}

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sub{*{$::{$_}}{CODE}==$_[0]&& print for(%:: )}->(\&Meh);

October 8th, 2011, 03:36 PM

dheaven

Registered User

Join Date: Oct 2011

Posts: 4

Time spent in forums: 1 h 30 m 25 sec
Reputation Power: 0

Are you by any chance not using include guards and have multiple inclusion?
Your header should look like:

Code:

#ifndef NAMEOFTHELIB_H
#define NAMEOFTHELIB_H
//Your definitions
#endif

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