PortE problems (PIC18F4455)

Hi there,

If got a little problem (but strange to me). I'm trying to use portE of my pic18F4455. Now i'm using it as an input, but later I also want to use it as an output.

The problem is that only pin RE3 look to work fine.

Here the code I'm using:

Code:

---

        Include "modedefs.bas"
       
        DEFINE OSC 4
        E_0        VAR    WORD
        E_1        VAR    WORD
        E_2        VAR    WORD
        E_3        VAR    WORD
        TestLED    VAR    PORTC.6
        RS232TX    VAR    PORTD.2
     
Intro:
    ADCON0 = 7
    ADCON1 = 7
    ADCON2 = 7
    CMCON  = 7
    TRISC  = 255
   
    HIGH TestLED
    Pause 100
    LOW TestLED
    PAUSE 100
    HIGH TestLED
    Pause 100
    LOW TestLED
   
    SEROUT RS232TX,N9600, ["Start...",13,10]
    GOTO Main
   
Main:
      E_0 = PORTe.0
      E_1 = PORTe.1
      E_2 = PORTe.2
      E_3 = PORTe.3
      SEROUT RS232TX,N9600, ["E0=", #E_0, " E1=", #E_1, " E2=", #E_2, " E3=", #E_3 ,13,10]
      Pause 200

GOTO Main

---

In the serial output only the RE3-value changes from 1 to 0, when I switch the pin from high to low

Output:

E0=0 E1=0 E2=0 E3=1
E0=0 E1=0 E2=0 E3=0

What am I doing wrong?

adcon1=$0F
is one of the setting that will work...

datasheet ....

Thanks, I thought I'd tried everyting, but it works fine now.

Now I would like to disable the USB-controller of this pic, because I don't need this feature and I have to use the input pins RC4 and RC5.
I've read the datasheet and I can disable USB by setting bit3 (USBEN) of the UCON register to zero. The problem is that it looks that PBP doesn't know the commands I want to use. I think i have to use assembly. I tried the following, but I get a warning.

Code:

---

ASM
MOVLW 0h
MOVWF UCON
ENDASM

---

Warning:
Found opcode in collumn 1. (MOVLW)
Found opcode in collumn 1. (MOVWF)

I think my assembly knowledge is very bad

Reason is that there's no UCON register definition in the PIC18EXT.bas file

look at the end and add it like this

Code:

---

TXREG2        VAR        BYTE EXT
TXSTA        VAR        BYTE EXT
TXSTA1        VAR        BYTE EXT
TXSTA2        VAR        BYTE EXT
UCON    VAR        BYTE EXT <= here
VELRH        VAR        BYTE EXT
VELRL        VAR        BYTE EXT
WDTCON        VAR        BYTE EXT
WREG        VAR        BYTE EXT

---

hey!!! don't place the comment to the right ;)

Hi Steve,

I also need to add UCON and UCFG for a PIC 18F4550. Adding the variables in the file mentionned above corrects the undefined error at compile time, but how do those variables get linked with the proper registers?

Robert
:)

Ruben,

Unless I am mistaken, the USB module is disabled by default. That's why I need to turn it on for USB processing. If you need to use pins C4-5 as IO, you should not have any problems doing so.

Or did I read the datasheet backwards?

Robert
:)

I think I found a clue from Steve about where the variable would get linked to the actual register:
http://www.picbasic.co.uk/forum/show...75&postcount=5

Now I have to find the right file to edit and the right address.

Robert
:)

Interesting, it's in the USB Descriptor and USB18 files.

I think it is mainly dependant on whether or not the USB Voltage Regulator is enabled (which I forgot to enable).

Robert
:)

I'm going nuts!!!

Actually it's this 18F4550 that everyone seems to be raving about that is driving me nuts! Or is the 18FXXX series in general.

Ok I'm getting there.

1. Downloaded MPASM.
2. Setup Microcode studio to use MPASM
3. Figured out how to set the CONFIG fuses... Phewww!

But now a new problem. (Next in the chain you could say) ;)

Setting the ADCON0:2 to registers causes compile errors and warnings
Setting the CMON register causes compile errors and warnings

I've even tried cut and pasting the ASM code from the data sheet, but to no avail.

Any help appreciated. Maybe we should setup an 18F forum??? :(

Squib

This is all I have along with the Port definitions, variables and constants:

DEFINE OSC 48 ' 20MHz crystal with HSPLL enabled = 48MHz
DEFINE I2C_SLOW 1 ' Access I2C device above 8MHz
DEFINE I2C_HOLD 1 ' Permit I2C device to hold clock line low
CLEAR

Maybe just trying with the default values?

Here's my CONFIG file for 48MHz USB processing, I commented in all values so that I can easily change things around. The base of this setup came from Bruce's post.

Robert
:)

Quote:

---

Originally Posted by Squibcakes

Setting the ADCON0:2 to registers causes compile errors and warnings
Setting the CMON register causes compile errors and warnings

I've even tried cut and pasting the ASM code from the data sheet, but to no avail.

---

Sounds bad to me, sounds like you have a corrupted INC file OR there's something bad in the PBP-Plugin installation or in the project building process.

can you post all your files generated in MPLAB (MCW and all other in a zip) and or a COPY/PASTE of the error you got.

Ok I found the problem... Sorry for the hassle, but this chip has a few traps man!

The problem was with the CONFIG statements, I was using Steve's example:
<b>
ASM
CONFIG FOSC=HS ; Use HS oscillator (20MHZ here)
CONFIG BOR=ON ; Brown out reset ON
CONFIG BORV=2 ; Brown out detect voltage=4.5 Volt
CONFIG PWRT=ON ; Power-up timer ON
CONFIG WDT=ON ; Watch dog timer ON
<i>....... etc.......</i>
ENDASM
</b>

This would compile ok on its own.

But as soon as I started to add code (eg CMCON = 7) and the likes I got heaps of Compile errors. (Yes I did delete the _config lines in the 18F4550.inc file!!)

Anyway I fixed the problem by not using the above asm example but rather this instead. (I found this example in one of Mel's threads not sure where now)

<b>
<i>' PRESET FUSES</i>

_CONFIG_FOSC_HS ; Use HS oscillator (20MHZ here)
_CONFIG_BOR_ON ; Brown out reset ON
_CONFIG_BORV_2 ; Brown out detect voltage=4.5 Volt
_CONFIG_PWRT_ON ; Power-up timer ON
_CONFIG_WDT_ON ; Watch dog timer ON
_CONFIG_STVREN_ON ; Stack over/underflow ON
_CONFIG_LVP_OFF ; Low Voltage programming OFF
_CONFIG_DEBUG_OFF ; Background debugger OFF
_CONFIG_VREGEN_OFF ; USB voltage regulator disabled
...... etc ......
</b>

Hope this info helps others when dealing with the dreaded 18F series. hahaha

Squib

you didn't read the whole post of the config fuse setting. I found the issue later on the same thread. If you want to use the new CONFIG directive, you MUST set them in the pic18F4550.inc file. As now PBP don't support the new directive... this where the Config file (stated in the thread) where born

NOW being said... if i use the CONFIG stuff bellow.. in wich i did few error for my own pleasure ..

Code:

---

        CONFIG PLLDIV = 5          ; Divide by 5 (20 MHz oscillator input)
        CONFIG CPUDIV = OSC2_PLL3  ; [OSC1/OSC2 Src: /2][96 MHz PLL Src: /3]
        CONFIG USBDIV = 1          ; USB clock source comes directly from the primary oscillator block with no postscale
        CONFIG FOSC = HS          ; HS oscillator, HS used by USB
        CONFIG FCMEM = ON          ; Fail-Safe Clock Monitor enabled
        CONFIG IESO = ON          ; Oscillator Switchover mode enabled
        CONFIG PWRT = ON          ; PWRT enabled
        CONFIG BOR = ON            ; Brown-out Reset enabled in hardware only (SBOREN is disabled)
        CONFIG BORV = 2           
        CONFIG VREGEN = ON        ; USB voltage regulator enabled
        CONFIG WDT = ON            ; HW Enabled - SW Disabled
        CONFIG WDTPS = 1          ; 1:1
        CONFIG MCLRE = ON          ; MCLR pin enabled; RE3 input pin disabled
        CONFIG LPT1OSC = OFF      ; Timer1 configured for higher power operation
        CONFIG PBADEN = ON        ; PORTB<4:0> pins are configured as analog input channels on Reset
        CONFIG CCP2MX = ON        ; CCP2 input/output is multiplexed with RC1
        CONFIG STVREN = ON        ; Stack full/underflow will cause Reset
        CONFIG LVP = OFF          ; Single-Supply ICSP disabled
        CONFIG ICPRT = OFF        ; ICPORT disabled
        CONFIG XINST = OFF        ; Instruction set extension and Indexed Addressing mode disabled (Legacy mode)
        CONFIG DEBUG = OFF        ; Background debugger disabled, RB6 and RB7 configured as general purpose I/O pins
        CONFIG CP0 = OFF          ; Block 0 (000800-001FFFh) not code-protected
        CONFIG CP1 = OFF          ; Block 1 (002000-003FFFh) not code-protected
        CONFIG CP2 = OFF          ; Block 2 (004000-005FFFh) not code-protected
        CONFIG CP3 = OFF          ; Block 3 (006000-007FFFh) not code-protected
        CONFIG CPB = OFF          ; Boot block (000000-0007FFh) not code-protected
        CONFIG CPD = OFF          ; Data EEPROM not code-protected
        CONFIG WRT0 = OFF          ; Block 0 (000800-001FFFh) not write-protected
        CONFIG WRT1 = OFF          ; Block 1 (002000-003FFFh) not write-protected
        CONFIG WRT2 = OFF          ; Block 2 (004000-005FFFh) not write-protected
        CONFIG WRT3 = OFF          ; Block 3 (006000-007FFFh) not write-protected
        CONFIG WRTB = OFF          ; Configuration registers (300000-3000FFh) not write-protected
        CONFIG WRTC = OFF          ; Boot block (000000-0007FFh) not write-protected
        CONFIG WRTD = OFF          ; Data EEPROM not write-protected
        CONFIG EBTR0 = OFF        ; Block 0 (000800-001FFFh) not protected from table reads executed in other blocks
        CONFIG EBTR1 = OFF        ; Block 1 (002000-003FFFh) not protected from table reads executed in other blocks
        CONFIG EBTR2 = OFF        ; Block 2 (004000-005FFFh) not protected from table reads executed in other blocks
        CONFIG EBTR3 = OFF        ; Block 3 (006000-007FFFh) not protected from table reads executed in other blocks
        CONFIG EBTRB = OFF        ; Boot block (000000-0007FFh) not protected from table reads executed in other blocks

---

and i place it in the 18F4550.inc file like that

Code:

---

;****************************************************************
;*  18F4550.INC                                                *
;*                                                              *
;*  By        : Leonard Zerman, Jeff Schmoyer                  *
;*  Notice    : Copyright (c) 2004 microEngineering Labs, Inc.  *
;*              All Rights Reserved                            *
;*  Date      : 12/31/04                                        *
;*  Version  : 2.46                                            *
;*  Notes    :                                                *
;****************************************************************
        NOLIST
    ifdef PM_USED
        LIST
        "Error: PM does not support this device.  Use MPASM."
        NOLIST
    else
        LIST
        LIST p = 18F4550, r = dec, w = -311, f = inhx32
        INCLUDE "P18F4550.INC"        ; MPASM  Header
        CONFIG PLLDIV = 5          ; Divide by 5 (20 MHz oscillator input)
        CONFIG CPUDIV = OSC2_PLL3  ; [OSC1/OSC2 Src: /2][96 MHz PLL Src: /3]
        CONFIG USBDIV = 1          ; USB clock source comes directly from the primary oscillator block with no postscale
        CONFIG FOSC = HS          ; HS oscillator, HS used by USB
        CONFIG FCMEM = ON          ; Fail-Safe Clock Monitor enabled
        CONFIG IESO = ON          ; Oscillator Switchover mode enabled
        CONFIG PWRT = ON          ; PWRT enabled
        CONFIG BOR = ON            ; Brown-out Reset enabled in hardware only (SBOREN is disabled)
        CONFIG BORV = 2           
        CONFIG VREGEN = ON        ; USB voltage regulator enabled
        CONFIG WDT = ON            ; HW Enabled - SW Disabled
        CONFIG WDTPS = 1          ; 1:1
        CONFIG MCLRE = ON          ; MCLR pin enabled; RE3 input pin disabled
        CONFIG LPT1OSC = OFF      ; Timer1 configured for higher power operation
        CONFIG PBADEN = ON        ; PORTB<4:0> pins are configured as analog input channels on Reset
        CONFIG CCP2MX = ON        ; CCP2 input/output is multiplexed with RC1
        CONFIG STVREN = ON        ; Stack full/underflow will cause Reset
        CONFIG LVP = OFF          ; Single-Supply ICSP disabled
        CONFIG ICPRT = OFF        ; ICPORT disabled
        CONFIG XINST = OFF        ; Instruction set extension and Indexed Addressing mode disabled (Legacy mode)
        CONFIG DEBUG = OFF        ; Background debugger disabled, RB6 and RB7 configured as general purpose I/O pins
        CONFIG CP0 = OFF          ; Block 0 (000800-001FFFh) not code-protected
        CONFIG CP1 = OFF          ; Block 1 (002000-003FFFh) not code-protected
        CONFIG CP2 = OFF          ; Block 2 (004000-005FFFh) not code-protected
        CONFIG CP3 = OFF          ; Block 3 (006000-007FFFh) not code-protected
        CONFIG CPB = OFF          ; Boot block (000000-0007FFh) not code-protected
        CONFIG CPD = OFF          ; Data EEPROM not code-protected
        CONFIG WRT0 = OFF          ; Block 0 (000800-001FFFh) not write-protected
        CONFIG WRT1 = OFF          ; Block 1 (002000-003FFFh) not write-protected
        CONFIG WRT2 = OFF          ; Block 2 (004000-005FFFh) not write-protected
        CONFIG WRT3 = OFF          ; Block 3 (006000-007FFFh) not write-protected
        CONFIG WRTB = OFF          ; Configuration registers (300000-3000FFh) not write-protected
        CONFIG WRTC = OFF          ; Boot block (000000-0007FFh) not write-protected
        CONFIG WRTD = OFF          ; Data EEPROM not write-protected
        CONFIG EBTR0 = OFF        ; Block 0 (000800-001FFFh) not protected from table reads executed in other blocks
        CONFIG EBTR1 = OFF        ; Block 1 (002000-003FFFh) not protected from table reads executed in other blocks
        CONFIG EBTR2 = OFF        ; Block 2 (004000-005FFFh) not protected from table reads executed in other blocks
        CONFIG EBTR3 = OFF        ; Block 3 (006000-007FFFh) not protected from table reads executed in other blocks
        CONFIG EBTRB = OFF        ; Boot block (000000-0007FFh) not protected from table reads executed in other blocks         
        NOLIST
    endif
        LIST
EEPROM_START        EQU        0F00000h
BLOCK_SIZE        EQU        32

---

if i used the kinda unusefull code bellow
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=964&stc=1&d=1152676768 ">

No error, no nothing.. Config fuses? no problem
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=965&stc=1&d=1152676888 ">

I've heard somewhere that you should change all config fuse to be sure that all will be considered.

Using the OLD method is still working.. read the config fuse thread, there's @ errorlevel stuff... read it 'till the end ;)

Ok, now I get it and see it working. :)

We modify the 18FXXXX.inc file to set the Config fuses, not in the actual program. ;)

Cheers Mate

Squib

no problem. i still think about an utility to work around in meantime... when time will really permit ;)