>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" <rumpelteazer666KILLspamgmail.com>
> To: <.....piclistKILLspam.....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;
> }

> looks like something like that, but isn't
>
> config at 0x2007 __CONFIG = _HS_OSC &
> _WDT_OFF &
> _PWRTE_ON ;
>
> enough to turn it off? what can i do to check if
> this is due to wdt?
>
> On 5/13/05, Bob Ammerman <@spam@rammermanKILLspamverizon.net>
> wrote:
> >
> > Watch dog timer resetting????
> >
> >

>-----Original Message-----
>From: KILLspampiclist-bouncesKILLspammit.edu [RemoveMEpiclist-bouncesTakeThisOuTmit.edu]
>Sent: 13 May 2005 10:15
>To: Microcontroller discussion list - Public.
>Subject: Re: [PIC] strange problem
>
>
>
>> while(B0!=1);
>
>What is connected to the other 7 bits of PORTB ?  Since your
>setting in TRISB makes them all inputs, unless they are all
>wired to 0v then the above loop will NOT wait for you to press
>the button.
>
>You probably want to test just the bottom bit like this ...
>
>        while((B0 & 1) == 0) ;
>
>Peter

>
> >-----Original Message-----
> >From: spamBeGonepiclist-bouncesspamBeGonemit.edu [TakeThisOuTpiclist-bouncesEraseMEspam_OUTmit.edu]
> >Sent: 13 May 2005 10:15
> >To: Microcontroller discussion list - Public.
> >Subject: Re: [PIC] strange problem
> >
> >
> >
> >> while(B0!=1);
> >
> >What is connected to the other 7 bits of PORTB ?  Since your
> >setting in TRISB makes them all inputs, unless they are all
> >wired to 0v then the above loop will NOT wait for you to press
> >the button.
> >
> >You probably want to test just the bottom bit like this ...
> >
> >        while((B0 & 1) == 0) ;
> >
> >Peter
>
> I'm not familiar with the compiler (CCS?), but the syntax suggests that
> the original code is a bit test on RB0 and therefore quite valid.

> _asm
> movlw _a
> movwf _d1
> Delay_0:
> decfsz _d1, f
> goto Delay_0
> nop
> nop
>
> _endasm;