Neil,

just to test add external crystal and turn off internal also turn off brawn=
 out=20
reset.
see what happens.=20

AA




________________________________
From: PICdude <picdude3@narwani.org>
To: piclist@MIT.EDU
Sent: Mon, June 6, 2011 8:52:55 AM
Subject: [PIC] C issue

Decided to (finally) tinker with C programming this weekend, and using =20
the default install of Hi-Tech C (Lite) that came with MPLAB 8.66.

I created a basic piece of code to turn on some LED's (multiplexed =20
discrete and 7-segment) on an existing board I have, and it takes a =20
LONG time to start up -- in the order of several minutes, if at all. =20
One a couple occasions it worked right away.  So I'm guessing the =20
oscillator is not starting up properly...?

I also tried setting the config bits from the Config Bits menu rather =20
than the code and it worked (code ran immediately on programming) the =20
first time, but I can't reproduce that any more.

Also tried explicitly turning on Vdd and releasing from reset, but no =20
difference.  And the board works perfectly with assembly code.

What am I missing here?  For reference, this is the code I'm using (16F883)=
....



#include <pic.h>

__CONFIG(1, FOSC_INTRC_NOCLKOUT & DEBUG_OFF & WDTE_OFF & LVP_OFF & =20
BOR_ON & CP_OFF & CPD_OFF & FCMEN_ON & IESO_ON & MCLRE_OFF & PWRTE_ON);
__CONFIG(2, BOR4V_BOR40V & WRT_OFF);

#define FOSC 8000000L            /* 8 Mhz internal clock */

void main(void)
{
    INTCON =3D 0;

    OSCCON =3D 0x71;                /* 8 Mhz internal clock */

    TRISA =3D 0b00001011;
    TRISB =3D 0b11100000;
    TRISC =3D 0b00000000;            /* PORTC is all outputs */

    ANSEL =3D 0b00000011;            /* RA0,1 are analog inputs */
    ANSELH =3D 0;
    ADCON1 =3D 0b00010000;        /* Left justified, External Vref+ */

    OPTION_REG =3D 0;                /* Port-B pullups active */
    WPUB =3D 0b01100000;

    VRCON =3D 0;                    /* Turn off */
    T1CON =3D 0;
    CM1CON0 =3D 0;
    CM2CON0 =3D 0;
    CM2CON0 =3D 0x02;                /* Turn off comparators */

    PORTA =3D 0b11111111;            /* Turn on all columns */
    PORTB =3D 0b11111111;            /* Turn on all rows */
    PORTC =3D 0b10101010;            /* Turn on all rows */

/* TODO -- testing... just stop here for now */
    for    (;;)
    {
    }
}


Cheers,
-Neil.




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