Program structure- whats wrong:*** Error 112 "F:\CCS_Fe

[Guest]

I wrote a lot of programms with only one C-file. Now I want to structure my program but it doesn�t work. I always get this error:
*** Error 112 "F:\CCS_Feheler\Display.c" Line 31(0,1): Function used but not defined: ... main

This is the MAIN.C:

#include <16F877>
#include "main.h"
#include "Display.h"


int Command_int;
int Data_int;

void main (void)
{

set_tris_e(0x00);
set_tris_d(0x00);

Display_Command ( 63 ); // Display an (62 + 63)

for (;;)
{
output_high(CS1);
output_low(CS2);
Write_Display_Data ( 0x00 );
output_low(CS1);
}

}





This is the DISPLAY.C:

#include <16F877>
#include "main.h"
#include "Display.h"


void Display_Command ( Command_int )
{
output_low(ENABLE);
output_low(R_W);
output_low(D_I);
output_d(Command_int);
delay_us(1);
output_high(ENABLE);
delay_us(1);
output_low(ENABLE);
}

void Write_Display_Data ( Data_int )
{
output_low(ENABLE);
output_low(R_W);
output_high(D_I);
output_d(Data_int);
delay_us(1);
output_high(ENABLE);
delay_us(1);
output_low(ENABLE);
}




This is the MAIN.H:

void main ( void );

#FUSES HS,NOWDT,NOPROTECT,NOPUT,NOBROWNOUT,NOLVP,NOCPD,NOWRT
#use delay(clock=16000000)

#use STANDARD_IO (A)
#use STANDARD_IO (B)
#use STANDARD_IO (C)
#use FAST_IO (D)
#use FAST_IO (E)

#use I2C(MASTER, SDA=PIN_C4, SCL=PIN_C3, SLOW, FORCE_HW)

#define CS1 PIN_C1
#define CS2 PIN_C0
#define RESET PIN_E0
#define R_W PIN_C5
#define D_I PIN_E2
#define ENABLE PIN_E1




This is the DISPLAY.H:

//---------------------------------------------------------------------
// Function Prototypes
//---------------------------------------------------------------------

void Display_Command ( Command_int );
void Write_Display_Data ( Data_int );



I don�t understand it: the main function is defined in Main.c - isn�t it?

[Ttelmah]

The simple answer is that you cannot/must not 'prototype' the main function.

Best Wishes

[rwyoung]

Your prototypes aren't correct. You need to explicitly specify the datatype in your prototypes.

[sjbaxter]

... if you add the variable type to your function prototypes, you then don't need the declarations at the top of main :

[epideath]

All of the above are needed but also With CCS you need to tell the compiler to load the seperate C files

So you need to use

#include "Display.c" instead of "Display.h".

Once that the C file is loaded then the functions will be loaded and they don't necessarily have to be prototyped as they get loaded before the call to them.
But it doesn't hurt to have the prototype as something may change in the future or if you wanted to port this to some other compiler at some time.

But as far as multiple source files CCS basically looks at them as one big C file.

Hope that makes sense.

Regards