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Set tris doesn't work

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KALKAN

Joined: 17 Apr 2005
Posts: 2

Set tris doesn't work

Posted: Mon Jul 04, 2005 7:42 am

I made down counter with LED display. I want to use RB0 to INT. I read set_tris_b(0b0000001). But I cant use INT. What can I do?

Code:

#include <16F628.h>
#use delay ( clock = 6000000 )
#fuses HS,NOWDT,NOPROTECT,NOLVP,nomclr

BYTE CONST LED_MAP[10] = {0x7e,0x0c,0xb6,0x9e,0xcc,0xda,0xfa,0x0e,0xfe,0xde};

char saya,sayac=9,say=9, say1=9,say2=9;

#INT_EXT
void ext_isr(void)
{
static short button=TRUE;

if(button ){say--;}

}

void display_segs(char c)
{

output_b(LED_MAP[c]);

}

void display(char bir, char iki,char uc, ) {
display_segs(bir);
output_high(PIN_a0);
delay_ms(5);
output_low(PIN_a0);
display_segs(iki);
output_high(PIN_a1);
delay_ms(5);
output_low(PIN_a1);
display_segs(uc);
output_high(PIN_a2);
delay_ms(5);
output_low(PIN_a2);

}

void gos(void)
{
if(say==-1)
{
say1--;
say=9;
}
if(say1==-1)
{
say2--;

say1=9;
}
if(say2==-1)
{

say2=9;
}

if(input(pin_a5))
{
say=0, say1=0,say2=0;
}

}

void main(void)
{

ext_int_edge(H_TO_L);
enable_interrupts(INT_EXT);
enable_interrupts(GLOBAL);
set_tris_B(0x01);

while(TRUE)
{
display(say, say1, say2);

gos();

}

}

newguy

Joined: 24 Jun 2004
Posts: 1907

Posted: Mon Jul 04, 2005 8:04 am

Do you have an external pullup on B0? If not, use:

Code:

enable_pullups(TRUE);

ckielstra

Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

Posted: Mon Jul 04, 2005 8:08 am

Code:

char saya,sayac=9,say=9, say1=9,say2=9;

From the CCS manual chapter 'Data Definitions':

Quote:

All types, except float, by default are unsigned; however, maybe preceded by unsigned or signed

Change your line to

Code:

signed int8 saya,sayac=9,say=9, say1=9,say2=9;

Also be make sure to add a switch debouncing meassure or the following line is due to fail:

Code:

if(say==-1)

Your switch will trigger the interrupt multiple times, so the variable 'say' will be decremented multiple times and become smaller than -1.
Search this forum for debounce software. As another option you can create a hardware debounce from the Schmitt-trigger function of the Int-ext input and adding an external R/C combination with a time constant of minimal 10ms.

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