I am not proud of my C skills, but until you get better advice take a hard 
look at that
"while(B0!=1);"
and see if you really can get by it without the bit button.

John Ferrell
http://DixieNC.US

----- Original Message ----- 
From: "rumpelteazer666" <rumpelteazer666@gmail.com>
To: <piclist@mit.edu>
Sent: Thursday, May 12, 2005 8:27 PM
Subject: [PIC] strange problem


I've tried to find something useful on the datasheet,tutorials and pic
books, i've tried to write it both in c and in assembler, you never know,
but the problem is always there. I don't know if i can reasonably expect
someone to look at the code and do the thinking for me, but this is my last
hope, so i will try. The code in the while(1) block should just send a
square
wave to PORTA, but i put a while(B0!=1); before it. What i think it should
do is, it stays still until i press the button (putting a 1 on the first bit
of PORTB) and then start to play the squarewave, forgetting about the
button. Well, i put it on the breadboard and i found that actually it plays
the wave only as long as i keep the button pushed down. If i let a 0 on
PORTB it stops again, waiting for a new 1. So somehow it goes back to the
first while, how's that? :-/

ps. i know the code is useless and weird, it was a starting point to develop
what i wanted to be my first pic project, but then i got blocked on my first
steps by this thing.


#define __16f628
#include <pic/pic16f628.h>

typedef unsigned int config;
config at 0x2007 __CONFIG = _HS_OSC &
_WDT_OFF &
_PWRTE_ON ;

BIT_AT(PORTB_ADDR,0) B0;

void delay(void);

unsigned char a,d1;

void main(void){

CMCON=7;
TRISA=0;
TRISB=255;

a=150;
PORTA=0;

while(B0!=1);
while(1){
PORTA=1;
delay();
PORTA=255;
delay();

}
}

void delay(void){
_asm
movlw _a
movwf _d1
Delay_0:
decfsz _d1, f
goto Delay_0
nop
nop

_endasm;
}
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist 


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist