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Problems with constants

 
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Richi
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Problems with constants
PostPosted: Thu Jul 20, 2006 3:14 pm     Reply with quote
Iīm using a PIC16F877, so I have to split the Functions. But now I canīt put my Constants and the programm in one function. I tried this code, but it doesnīt work:

Main.c file:

Hauptmenu_A();




Hauptmenu_A.c file:

int Konstanten_Hauptmenu (int x)
{

BYTE CONST Konstanten_Hauptmenu_A [64] = {
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x10,0x20,0x60,0xC0,0xC0,0x80,0x80,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x30,0x30,0x30,0x30,0x30,0x30,
0x30,0xF0,0xE0,0x00,0xF0,0xF0,0x00,0x00,
0x00,0x00,0x00,0xF0,0xF0,0x00,0xE0,0xF0};

return(Konstanten_Hauptmenu_A[x]);
}

void Hauptmenu_A (void)
{
for (x = 0; x < 63; ++x)
{
Write_Display_Data (Konstanten_Hauptmenu_A[x]);
m = Konstanten_Hauptmenu_A[x];
}
}


.... m is always a random number... any Ideas?
rwyoung



Joined: 12 Nov 2003
Posts: 563
Location: Lawrence, KS USA

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PostPosted: Thu Jul 20, 2006 3:38 pm     Reply with quote
Consider two arrays of 32 each.

Code:

const int8 A[] = { /*put first 32 values here*/};
const int8 B[] = { /*put second 32 values here*/};

int Konstanten_Hauptmenu(int x)
{
   if (x>31)
      return(B[x]);
   else
      return(A[x]);
}


Maybe not the prettiest but might work.
_________________
Rob Young
The Screw-Up Fairy may just visit you but he has crashed on my couch for the last month!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Jul 20, 2006 3:43 pm     Reply with quote
I made the test program, shown below. It works.
It displays the following:
Quote:

0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 10 20 60 C0 C0 80 80 00 00 00 etc.

I tested this with PCM vs. 3.249.
Code:
#include <16F877.h>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

int Konstanten_Hauptmenu (int x)
{

BYTE CONST Konstanten_Hauptmenu_A [64] = {
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x10,0x20,0x60,0xC0,0xC0,0x80,0x80,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x30,0x30,0x30,0x30,0x30,0x30,
0x30,0xF0,0xE0,0x00,0xF0,0xF0,0x00,0x00,
0x00,0x00,0x00,0xF0,0xF0,0x00,0xE0,0xF0};

return(Konstanten_Hauptmenu_A[x]);
}

void Hauptmenu_A (void)
{
int8 x;
int8 m;

for(x = 0; x < 63; ++x)
   {
    //Write_Display_Data (Konstanten_Hauptmenu_A[x]);
    m = Konstanten_Hauptmenu(x);
    printf("%X ", m);
   }
}


//=================================
main()
{

Hauptmenu_A();

while(1);
}
Richi
Guest
PostPosted: Thu Jul 20, 2006 11:32 pm     Reply with quote
Thanks a lot PCM, found the error this morning: I declared the constants not global but in a subroutine local....
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