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Q> about function calling

 
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Ivalex



Joined: 03 Jun 2011
Posts: 2

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Q> about function calling
PostPosted: Fri Jun 03, 2011 2:00 am     Reply with quote

I keep getting the error "Function used but not defined: ...time SCR=1944"

Here is the code:

Code:

#include <16F877A.h> //Initialization
#include <stdio.h>
#include <time.h>
#include <string.h>
#fuses HS, NOWDT, NOPROTECT, NOLVP, PUT
#use delay (clock=20000000)
#use rs232 (baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#use i2c(master, sda=PIN_C4, scl=PIN_C3, FAST=100000)

time_t time(time_t * timer);
struct_tm * localtime ( time_t * timer );

void main()
{ //Start of Main Program

int sec;
int min;
int hrs;
int day;
int month;
int yr;
int dow;

time_t curtime;
struct_tm *t;

curtime=time(NULL); *the error points here and...
t = localtime (&curtime); *here
}


this is just a bit of the program but I think those are not related much so the only important aspects were just posted Smile

thank you in advance to those who would reply
Ttelmah



Joined: 11 Mar 2010
Posts: 19552

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PostPosted: Fri Jun 03, 2011 2:17 am     Reply with quote

Read the header of the time.h file:

"/// This file only provides the prototypes and definitions needed to ///
/// proved a time alogrithm that follows the C standard library. You ///
/// also need to include/link the actual library that performs the time ///
/// base. As of this writing CCS provides such a library, rtctimer.c, ///
/// which performs the needed timebase on Timer2. You may see a similar ///
/// library for the dsPIC which has an internal RTC. "

Third line.
You have included the prototype function (twice - you have duplicated the definition in your own code), but nowhere are you including the actual function.....

Best Wishes
Ivalex



Joined: 03 Jun 2011
Posts: 2

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PostPosted: Fri Jun 03, 2011 3:04 am     Reply with quote

Damn... Spend half a day working on that...

thx for the clarification but I'm confused on what to do

Should I:

1.) include the rtctimer.c file into my main.c and use or call the functions needed?
2.) copy paste the contents of the functions that I want into the main.c?

sorry but I forgot most of my c programming T_T
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Jun 03, 2011 4:02 pm     Reply with quote

Quote:
1.) include the rtctimer.c file into my main.c and use or call the functions needed?

Yes, that's the normal way to use a driver file. You include it with an
#include statement. That's how CCS does it in this example file:
Quote:

c:\program files\picc\examples\ex_rtctimer.c
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