help programming 18f4431

[thiru_electrifiers]

hello all, i am migrating from 16f to 18f.
first i am trying with 18f4431 and blinking led... as usual.
the problem is, when i try to program the uC for the first time, it succeeds.
but for second time, programming fails again and again.

i am using
HARDWARE: jdm programmer v 5.2
SOFTWARE: WinPic

even i tried with another new 18f4431. i got the same result.
i am using 20Mhz Xtal.
i selected HS mode and disabled all other settings in CONFIG WORD

can any one please give the configuration settings for minimum operation like led testing?

Thanks for reading...

 

[zanes]

You sure you've not got 18C4431's?

 

[Mike - K8LH]

People seem to have mixed results using JDM style programmers. I wonder if you're using INTOSC and MCLRE off? If so, this may cause a problem with any programmer which does not control the VDD line to the target.

Here's the configuration fuse settings I've used for a couple recent projects. You can probably skip all of the 'protection' fuses for now.

Good luck. Regards, Mike

        list p=18F4431, b=8, c=102, n=71, t=on, st=off, f=inhx32
;******************************************************************
;*                                                                *
;*  Filename: 18F4431 Boot 24.asm (v2.4)                          *
;*    Author: Mike McLaren, K8LH  (k8lh@arrl.net)                 *
;*      Date: 18-May-05  (last rev 09-Apr-08)                     *
;*                                                                *
;*   18F4431 Serial Boot Loader Program (08/64 algorithm)         *
;*   based in part on early Microchip code examples               *
;*                                                                *
;*  - 8 MHz INTOSC or HS Crystal oscillator                       *
;*  - occupies 0000-01FF code space (256 words)                   *
;*  - RS-232 interface, 19.2 kb, <Xon> <Xoff> handshaking         *
;*  - inputs raw hex files which may contain code space holes     *
;*                                                                *
;*     MPLab: 8.01    (tabs = 8)                                  *
;*     MPAsm: 5.15                                                *
;*                                                                *
;******************************************************************

        processor PIC18F4431
        include "p18f4431.inc"

;-< radix, clock, and BRG constants >------------------------------

        radix   dec

clock   equ     8               ; 8 MHz INTOSC
brgval  equ     (clock*1000000/19200/16)-1

;-< configuration fuses >------------------------------------------

     if clock == 8              ;
        config  OSC = IRCIO     ; INTOSC, RA6 and RA7 I/O
     else                       ;
        config  OSC = HS        ; hs xtal oscillator
     endif
        config  FCMEN = OFF     ; fail-safe clock monitor disabled
        config  IESO = OFF      ; oscillator switchover disabled
        config  PWRTEN = ON     ; power up timer on
        config  BOREN = OFF     ; brown out reset enable on
        config  BORV = 45       ; brown out reset voltage 4.5v
        config  WDTEN = OFF     ; watchdog timer disabled
        config  WINEN = OFF     ; watchdog timer enable window
        config  WDPS = 16       ; watchdog timer prescaler
        config  T1OSCMX = OFF   ; timer1 oscillator MUX
        config  HPOL = HIGH     ; high side transistor active high
        config  LPOL = HIGH     ; low side transistor active high
        config  PWMPIN = OFF    ; PWM pin reset state control
        config  MCLRE = ON      ; MCLR pin enabled
        config  EXCLKMX = RC3   ; external clock MUX bit
        config  PWM4MX = RB5    ; PWM4 MUX bit
        config  SSPMX = RD1     ; SSP I/O MUX bit
        config  FLTAMX = RD4    ; FLT MUX bit
        config  STVREN = OFF    ; stack overflow/underflow reset
        config  LVP = OFF       ; low voltage programming
        config  DEBUG = OFF     ; background debug off

;-< code protection fuses >----------------------------------------

        config  CP0 = OFF       ; Block 0 (000200-0007FFh)
        config  CP1 = OFF       ; Block 1 (000800-000FFFh)
        config  CP2 = OFF       ; Block 2 (001000-0017FFh)
        config  CP3 = OFF       ; Block 3 (001800-001FFFh)
        config  CPB = OFF       ; Boot    (000000-0001FFh)
        config  CPD = OFF       ; EEPROM

;-< write protection fuses >---------------------------------------

        config  WRT0 = OFF      ; Block 0 (000200-0007FFh)
        config  WRT1 = OFF      ; Block 1 (000800-000FFFh)
        config  WRT2 = OFF      ; Block 2 (001000-0017FFh)
        config  WRT3 = OFF      ; Block 3 (001800-001FFFh)
        config  WRTB = OFF      ; Boot    (000000-0007FFh)
        config  WRTC = OFF      ; Config  (300000-3000FFh)
        config  WRTD = OFF      ; EEPROM

;-< read protection fuses >----------------------------------------

        config  EBTR0 = OFF     ; Block 0 (000200-0007FFh)
        config  EBTR1 = OFF     ; Block 1 (000800-000FFFh)
        config  EBTR2 = OFF     ; Block 2 (001000-0017FFh)
        config  EBTR3 = OFF     ; Block 3 (001800-001FFFh)
        config  EBTRB = OFF     ; Boot    (000000-0007FFh)

 

[thiru_electrifiers]

are you kidding me?
any way... my chip ic pic18f4431.
thanks for your reply..

 

[mvs sarma]

are you kidding me?
any way... my chip ic pic18f4431.
thanks for your reply..

please ensure that the code protect is not ON in the first instance, or during learning times.
Then try to put your software either assembly or C on the net so that others could suggest you. In the absence, it would be difficult to imagine.

Why use word like kidding-- after all who has time for all that.
The V5.2 programmer has Vpp before Vdd link
keep it in the Vpp before Vdd side.

 

[thiru_electrifiers]

ok i wil try that..
my code has nothing but,

#include <pic18fxx31.h>


void main(void)
{
ANSEL0 = 0x00;
ANSEL1 = 0x00;

TRISA = 0x00;
TRISB = 0x00;
TRISC = 0x00;
TRISD = 0x00;
TRISE = 0x00;

for(;
{
PORTA = 0xFF;
PORTB = 0xFF;
PORTC = 0xFF;
PORTD = 0xFF;
PORTE = 0xFF;
}

}

 

[mvs sarma]

ok i wil try that..
my code has nothing but,

#include <pic18fxx31.h>


void main(void)
{
ANSEL0 = 0x00;
ANSEL1 = 0x00;

TRISA = 0x00;
TRISB = 0x00;
TRISC = 0x00;
TRISD = 0x00;
TRISE = 0x00;

for(;
{
PORTA = 0xFF;
PORTB = 0xFF;
PORTC = 0xFF;
PORTD = 0xFF;
PORTE = 0xFF;
}

}

I accept that I am a BIG zero in C language., But I fear you may have to define the chip configuration somewhere. like external /internal osc. and many others before you start real program . please, let me also learn with you, If It is C !

 

[Norlin]

you can often config the configuration word in the programmer application, configuring it in your code only helps because the programmer usually reads this and applies the configs accordingly

 

[blueroomelectronics]

I'm learning C18 too, and I've peeked at C30.

In C18 config is easy, use the #PRAGMA statement.

#pragma config WDT=OFF,OSC=INTIO2,LVP=OFF

 

[Pommie]

#include <pic18fxx31.h>

Where would I find that include file?

Mike.

 

[mvs sarma]

Where would I find that include file?

Mike.

Pommie, is it not a PIC header file for the concerned chip?

 

[thiru_electrifiers]

hello all,
the include file pic18fxx31.h comes with hitech C compiler. it can be located in the following path where you have installed the compiler
HI-TECH Software\PICC-18\pro\9.61>bin>includes

Also my procedure is to set the CONFIG settings like internal/external Osc, etc at the time of programming i.e. through the programmer application software. Is it a right procedure ?

 

[futz]

can any one please give the configuration settings for minimum operation like led testing?

By coincidence I was just finally getting around to doing something with my 18F4620, which is similar to the 4431. The 18F's have multiple config words. See chapter 22 in the datasheet for more info. Also look near the bottom of your compiler's chip def file for the proper defs to use for that compiler.

Here's a typical set of #pragma's for an 18F452:

// Configuration for PIC18F452 
#pragma DATA    _CONFIG1H, _OSCS_OFF_1H & _HS_OSC_1H
#pragma DATA    _CONFIG2L, _BOR_ON_2L & _BORV_20_2L & _PWRT_OFF_2L
#pragma DATA    _CONFIG2H, _WDT_OFF_2H & _WDTPS_128_2H
#pragma DATA    _CONFIG3H, _CCP2MX_ON_3H
#pragma DATA    _CONFIG4L, _STVR_ON_4L & _LVP_OFF_4L & _DEBUG_OFF_4L
#pragma DATA    _CONFIG5L, _CP0_OFF_5L & _CP1_OFF_5L & _CP2_OFF_5L & _CP3_OFF_5L
#pragma DATA    _CONFIG5H, _CPB_OFF_5H & _CPD_OFF_5H
#pragma DATA    _CONFIG6L, _WRT0_OFF_6L & _WRT1_OFF_6L & _WRT2_OFF_6L & _WRT3_OFF_6L
#pragma DATA    _CONFIG6H, _WRTC_OFF_6H & _WRTB_OFF_6H & _WRTD_OFF_6H
#pragma DATA    _CONFIG7L, _EBTR0_OFF_7L & _EBTR1_OFF_7L & _EBTR2_OFF_7L & _EBTR3_OFF_7L
#pragma DATA    _CONFIG7H, _EBTRB_OFF_7H

I went through the list and left out the settings I didn't need and here's what I'm currently using for my 18F4620 (using SourceBoost BoostC):

#pragma DATA    _CONFIG1H, _OSC_INTIO67_1H
#pragma DATA    _CONFIG2H, _WDT_OFF_2H
#pragma DATA    _CONFIG3H, _MCLRE_ON_3H
#pragma DATA    _CONFIG4L, _LVP_OFF_4L & _XINST_OFF_4L

That's probably pretty much minimum, I would think.

EDIT: For comparison, here's a #pragma for a 16F874A, which has only one config word:

// Configuration for PIC16F874A
#pragma DATA _CONFIG, _CP_OFF & _PWRTE_OFF & _WDT_OFF & _HS_OSC & _LVP_OFF

Much, much simpler.

 

[futz]

And here is my 18F4620 LED blinky test program. Should work without change for 4431, except for compiler-specific changes. Download and install the BoostC demo and it should work with no changes.

I switched from PICC to BoostC a while back for various reasons. The biggest reason was that I can actually afford to buy a license for BoostC. PICC is priced very high.

The LED is on RD1:

#include <system.h>

#pragma DATA    _CONFIG1H, _OSC_INTIO67_1H
#pragma DATA    _CONFIG2H, _WDT_OFF_2H
#pragma DATA    _CONFIG3H, _MCLRE_ON_3H
#pragma DATA    _CONFIG4L, _LVP_OFF_4L & _XINST_OFF_4L

void delay(int);

void main(void)
{
	unsigned char x;
	trisd = 0;
	for(x=0;x<6;x++)
	{
		latd.1 = 1;
		delay(1);
		latd.1 = 0;
		delay(1);
	}
	while(1);
}

void delay(int len)
{
	int x,y;
	for(x=0;x<len;x++)
	{
		for(y=0;y<5000;y++){}
	}
}