Matt Bonner wrote:
>
> David VanHorn wrote:
> >
> > I don't do C, but shouldn't you have some sort of chip setup code that
> > defines those pins as outputs, and maybe sets up a timer or something??
> >
> > The frequency of the crystal also enters into it, else how to know when N
> > seconds have passed? All the chip knows is xtal clocks, which don't have a
> > finite relationship to realtime.
>
> David,
> The 2 issues you raise are likely being handled by the following lines
> in Joshua's code:
>   #include <16c715.h>
>   #use delay(clock=20000000)
>
What David is refering to is the ASM "TRIS" command. It is used to setup
the I/O pins whether it is used as output or input. The header file does
not do this for you, it only points to the Tris register.
> Joshua,
> I don't know the PCM compiler, but your code looks OK (if my comments
> above to David are correct).  Can you describe your hardware?
>
> --Matt
Joshua asked for the ASM version for his proggy. Here is my feeble attempt
(the way I understand it. Note, I also don't use C):

list    P=16C715
include <16C715.h>

LED1    EQU     0       ;PORTA bit 0
LED2    EQU     1       ;PORTA bit 1

        org     0
        movlw   0x00    ;setup PORTA to be output
        TRIS    PORTA   ;or "CLRF TRISA" to replace both lines used with
                ;header
file

        CLRF    PORTA   ;reset PORTA

START
        BSF     PORTA,LED1      ;Switch on LED1
        CALL    DELAY   ;CALL DELAY Subroutine (not included here)
        BCF     PORTA,LED1      ;LED1 off
        NOP             ;Not always needed, just good housekeeping
        NOP
        BSF     PORTA,LED2
        CALL    DELAY
        BCF     PORTA,LED2
        GOTO    START

;Subroutines
;Subs go here

end