18F87K22 Port B Digital

Hi,

I am using a PIC18F87K22 and want to write a simple message to the LCD but something is not right, perhaps the set up of Port B is not correct?, any help would be greatly appreciated, I have the following code below:


DEFINE OSC 16
Define LCD_DREG PORTB ' Define LCD connections
Define LCD_DBIT 0
Define LCD_RSREG PORTB
Define LCD_RSBIT 4
Define LCD_EREG PORTB
Define LCD_EBIT 5
DEFINE LCD_BITS 4 'LCD bus size 4 or 8
DEFINE LCD_LINES 2 'Number lines on LCD
DEFINE LCD_COMMANDUS 2000 'Command delay time in us
DEFINE LCD_DATAUS 50 'Data delay time in us

ANCON0 = 0
ANCON1 = 0
ANCON2 = 0
Pause 10 ' Wait for LCD to startup



STARTUP:


Lcdout $fe, 1,"HELLO "
Lcdout $fe,$C0,"WORLD "
PAUSE 4000

goto startup



END

There is no fuse, and OSCCON isnt set.
Here is config for internal osc and 16MHz:

Code:

---

#CONFIG
    CONFIG RETEN = OFF
    CONFIG INTOSCSEL = LOW
    CONFIG SOSCSEL = LOW
    CONFIG XINST = OFF
    CONFIG FOSC = INTIO2
    CONFIG PLLCFG = OFF
    CONFIG FCMEN = OFF
    CONFIG IESO = OFF
    CONFIG PWRTEN = ON
    CONFIG BOREN = OFF
    CONFIG BORV = 3
    CONFIG BORPWR = ZPBORMV
    CONFIG WDTEN = OFF
    CONFIG WDTPS = 1048576
    CONFIG RTCOSC = SOSCREF
    CONFIG CCP2MX = PORTC
    CONFIG MSSPMSK = MSK7
    CONFIG MCLRE = OFF
    CONFIG STVREN = ON
    CONFIG BBSIZ = BB2K
    CONFIG CP0 = OFF
    CONFIG CP1 = OFF
    CONFIG CP2 = OFF
    CONFIG CP3 = OFF
    CONFIG CP4 = OFF
    CONFIG CP5 = OFF
    CONFIG CP6 = OFF
    CONFIG CP7 = OFF
    CONFIG CPB = OFF
    CONFIG CPD = OFF
    CONFIG WRT0 = OFF
    CONFIG WRT1 = OFF
    CONFIG WRT2 = OFF
    CONFIG WRT3 = OFF
    CONFIG WRT4 = OFF
    CONFIG WRT5 = OFF
    CONFIG WRT6 = OFF
    CONFIG WRT7 = OFF
    CONFIG WRTC = OFF
    CONFIG WRTB = OFF
    CONFIG WRTD = OFF
    CONFIG EBRT0 = OFF
    CONFIG EBRT1 = OFF
    CONFIG EBRT2 = OFF
    CONFIG EBRT3 = OFF
    CONFIG EBRT4 = OFF
    CONFIG EBRT5 = OFF
    CONFIG EBRT6 = OFF
    CONFIG EBRT7 = OFF
    CONFIG EBRTB = OFF
#ENDCONFIG

    DEFINE OSC 16
    DEFINE NO_CLRWDT 1
    OSCCON = %01110010

---

here is commented config for 18f67k22 , 64mhz internal

Code:

---

' config for 18F67K22

    #CONFIG

;----- CONFIG1L Options --------------------------------------------------
    CONFIG XINST    = OFF
    CONFIG SOSCSEL  = DIG        ; Digital (SCLKI) mode; I/O port functionality of RC0 and RC1 is enabled
    CONFIG INTOSCSEL = HIGH      ; LF-INTOSC in High-power mode during Sleep
    CONFIG RETEN    = ON

;----- CONFIG1H Options --------------------------------------------------
    CONFIG IESO      = OFF
    CONFIG FCMEN    = OFF
    CONFIG PLLCFG    = ON
    CONFIG FOSC      = INTIO2    ; Internal RC oscillator
 
;----- CONFIG2L Options --------------------------------------------------
    CONFIG BORPWR    = ZPBORMV    ; ZPBORMV instead of BORMV is selected
    CONFIG BORV      = 2          ; 2V
    CONFIG BOREN    = SBORDIS    ; Enabled in hardware, SBOREN disabled
    CONFIG PWRTEN    = ON        ; Power up timer on

;----- CONFIG2H Options --------------------------------------------------
    CONFIG WDTPS    = 512        ; 1:512
    CONFIG WDTEN    = ON        ; WDT ON
 
;----- CONFIG3L Options --------------------------------------------------
    CONFIG RTCOSC    = INTOSCREF      ; RTCC uses internal osc

;----- CONFIG3H Options --------------------------------------------------
    CONFIG MCLRE    = ON              ; MCLR Enabled, RG5 disabled
    CONFIG MSSPMSK  = MSK7            ; 7 Bit address masking mode
    CONFIG CCP2MX    = PORTC          ; RC1

;----- CONFIG4L Options --------------------------------------------------
    CONFIG DEBUG    = OFF
    CONFIG BBSIZ    = BB1K            ; 1K word Boot Block size
    CONFIG STVREN    = ON

;----- CONFIG5L Options -------------------------------------------------- 
   
    CONFIG CP0      = OFF
    CONFIG CP1      = OFF
    CONFIG CP2      = OFF
    CONFIG CP3      = OFF
    CONFIG CP4      = OFF
    CONFIG CP5      = OFF
    CONFIG CP6      = OFF
    CONFIG CP7      = OFF
 
;----- CONFIG5H Options -------------------------------------------------- 
  CONFIG  CPD      = OFF
  CONFIG  CPB      = OFF

;----- CONFIG6L Options -------------------------------------------------- 
    CONFIG WRT0      = OFF
    CONFIG WRT1      = OFF
    CONFIG WRT2      = OFF
    CONFIG WRT3      = OFF
    CONFIG WRT4      = OFF
    CONFIG WRT5      = OFF
    CONFIG WRT6      = OFF
    CONFIG WRT7      = OFF
 
;----- CONFIG6H Options -------------------------------------------------- 
    CONFIG WRTD      = OFF
    CONFIG WRTB      = OFF
    CONFIG WRTC      = OFF
 
;----- CONFIG7L Options -------------------------------------------------- 
    CONFIG EBRT0    = OFF
    CONFIG EBRT1    = OFF
    CONFIG EBRT2    = OFF
    CONFIG EBRT3    = OFF
    CONFIG EBRT4    = OFF
    CONFIG EBRT5    = OFF
    CONFIG EBRT6    = OFF
    CONFIG EBRT7    = OFF
 
;----- CONFIG7H Options -------------------------------------------------- 
    CONFIG EBRTB    = OFF
 
  #ENDCONFIG

---

usually the problems are with C port or D port as config affects use of those ports

Code:

---


 
  ' -------  Setup port B Variables  & directions  ----------                     
    INTCON2.7 = 0              ' Weak Pullups Globle PortB -  1= globel PortB disable, 0 = PortB Globle enable
    INTCON2.0 = 1              ' RBIP    - RB PortB Change Interupt Priority - 1 = High Priorty , 0 = Low Priority
   
    TRISB =  %11011111        ' setup Port B input=1,output=0 for I/O pins
    PORTB  = %00000000        ' Clear Outputs

---

You should also note that the PBP manual states ""a program should wait for up to half a second before sending the first command to an LCD. It can take quite a while for an LCD to start up."

I recently wasted an entire evening learning (the hard way) just how long it can take for an LCD to start up!

Change your line
Pause 10 ' Wait for LCD to startup

to

Pause 500 ' Wait for LCD to startup

and see how it goes.

Cheers
Barry
VK2XBP

Thanks All - Worked like a charm!, I now know to set Config Bits..;-)