I've tried to find something useful on the datasheet,tutorials and pic=20
books, i've tried to write it both in c and in assembler, you never know,=
=20
but the problem is always there. I don't know if i can reasonably expect=20
someone to look at the code and do the thinking for me, but this is my last=
=20
hope, so i will try. The code in the while(1) block should just send a=20
square
wave to PORTA, but i put a while(B0!=3D1); before it. What i think it shoul=
d=20
do is, it stays still until i press the button (putting a 1 on the first bi=
t=20
of PORTB) and then start to play the squarewave, forgetting about the=20
button. Well, i put it on the breadboard and i found that actually it plays=
=20
the wave only as long as i keep the button pushed down. If i let a 0 on=20
PORTB it stops again, waiting for a new 1. So somehow it goes back to the=
=20
first while, how's that? :-/

ps. i know the code is useless and weird, it was a starting point to develo=
p=20
what i wanted to be my first pic project, but then i got blocked on my firs=
t=20
steps by this thing.


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

typedef unsigned int config;
config at 0x2007 __CONFIG =3D _HS_OSC &
_WDT_OFF &
_PWRTE_ON ;

BIT_AT(PORTB_ADDR,0) B0;

void delay(void);

unsigned char a,d1;

void main(void){

CMCON=3D7;
TRISA=3D0;
TRISB=3D255;

a=3D150;
PORTA=3D0;

while(B0!=3D1);
while(1){
PORTA=3D1;
delay();
PORTA=3D255;
delay();

}
}

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

_endasm;
}
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