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problem assigning port_a with input_a()

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c0de

Joined: 14 May 2007
Posts: 14

problem assigning port_a with input_a()

Posted: Fri Nov 23, 2007 6:48 am

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Hello.

I'm trying to make a simple program to write the state of portA pins to a lcd.

Code:

#include <16F876.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#include <flex_lcd.c>

void read_port_a()
{
int8 x;
x = input_a();
int inc=0;
char bit[6];
for (inc=0; inc<=5; inc++)
{
if ( bit_test(x,inc) )
bit[inc] = '1';
else
bit[inc] = '0';
}
lcd_gotoxy(2,3);
printf(lcd_putc,"%c %c %c %c %c %c", bit[5],bit[4],bit[3],bit[2],bit[1],bit[0]);
delay_ms(20);
}

void main() {

int i = 0;
set_tris_a(0b00111111);
delay_ms(20);
lcd_init();
printf(lcd_putc,"\f");
printf(lcd_putc, " PIC16F76 LCD ");
printf(lcd_putc,"\n ------------- ");
printf(lcd_putc,"\n ");
printf(lcd_putc,"\n ------------- ");
while ( 1 )
{
read_port_a();
delay_ms(20);
}
}

everytime I try to compile the code, i get this:
Compiling: cos_lcd.c
1 Errors, 0 Warnings, Time: 1 Seconds
Error[51] cos_lcd.c 10 : A numeric expression must appear here
1 Errors, 0 Warnings.

which is this line:

Code:

int inc=0;

... I cannot figure what I'm missing
using pic16f876 and PCM compiler version 4.032; (linux)

Any help would be appreciated. Thanks

EDITED:
By some reason, i cannot define variables within custom functions. the program works if i define x, bit and inc variables globally (before the read_port_a function)

Ttelmah
Guest

Posted: Fri Nov 23, 2007 7:40 am

Reply with quote

You cannot declare a type once you have 'started' the function.
All declarations must be at the beginning of the function block (or global).

Code:

void read_port_a() {
//First the declarations
int8 x;
int inc=0;
char bit[6];
//Now the code
x = input_a();
for (inc=0; inc<=5; inc++) {
if ( bit_test(x,inc) )
bit[inc] = '1';
else
bit[inc] = '0';
}
lcd_gotoxy(2,3);
printf(lcd_putc,"%c %c %c %c %c %c", bit[5],bit[4],bit[3],bit[2],bit[1],bit[0]);
delay_ms(20);
}

Technically you could declare variables inside a sub function
(so have a leading '{', then a declaration, then more functions, and a trailing '}'), but in CCS, these are not identified as separate variables, so should be used with care.

Best Wishes

c0de

Joined: 14 May 2007
Posts: 14


Posted: Fri Nov 23, 2007 10:10 am

I didn't knew that:) Thanks alot.

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