porta.0 and porta.2 only goes high with HIGH command with PIC18F45K80

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  1. - 22nd January 2015, 14:35 #1
    bmoe79's Avatar
    bmoe79
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    Default porta.0 and porta.2 only goes high with HIGH command with PIC18F45K80

    Hi.

    I have a problem that if I set porta.0 and portb.2 high with porta.0=1 and porta.2=1 then they will not go high, but if I do HIGH porta.0 and HIGH porta.2 then they will.
    porta.1 and porta.3 works as expected.
    Anyone know why?

    In the display the code below gives me:
    00001111
    HIGH

    00000000
    LOW

    00001010
    =1

    00000000
    =0


    Code:
    ' PIC18F45K80 Configuration Bit Settings


#CONFIG
    CONFIG RETEN = OFF
    CONFIG INTOSCSEL = HIGH
    CONFIG SOSCSEL = DIG
    CONFIG XINST = OFF
    CONFIG FOSC = EC3
    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 CANMX = PORTB
    CONFIG MSSPMSK = MSK7
    CONFIG MCLRE = ON
    CONFIG STVREN = OFF
    CONFIG BBSIZ = BB2K
    CONFIG CP0 = OFF
    CONFIG CP1 = OFF
    CONFIG CP2 = OFF
    CONFIG CP3 = OFF
    CONFIG CPB = OFF
    CONFIG CPD = OFF
    CONFIG WRT0 = OFF
    CONFIG WRT1 = OFF
    CONFIG WRT2 = OFF
    CONFIG WRT3 = OFF
    CONFIG WRTC = OFF
    CONFIG WRTB = OFF
    CONFIG WRTD = OFF
    CONFIG EBTR0 = OFF
    CONFIG EBTR1 = OFF
    CONFIG EBTR2 = OFF
    CONFIG EBTR3 = OFF
    CONFIG EBTRB = OFF
#ENDCONFIG




'************************* DEFINES ******************************
define OSC 64


define LCD_DREG PORTC
define LCD_DBIT 0
define LCD_RSREG PORTC
define LCE_RSBIT 4
define LCD_EREG PORTC
define LCD_EBIT 5
define LCD_BITS 4
define LCD_LINES 2
define LCD_COMMANDUS 3000
define LCD_DATAUS 100




'********************** PIN VARIABLES ***************************




'************************ VARIABLES *****************************




'************************ REGISTERS *****************************
ANCON0 = 000000
ANCON1 = 000000
ADCON0 = 000000
ADCON1 = 000000




'*********************** PORT CONFIG ****************************
TRISA = 100000                                   'porta direction 0=OUTPUT 1=INPUT
PORTA = 000000                                   'porta preset
TRISB = 010111                                   'portb direction 0=OUTPUT 1=INPUT
PORTB = 000000                                   'portb preset
TRISC = 000000                                   'portc direction 0=OUTPUT 1=INPUT
PORTC = 000000                                   'portc preset
TRISD = 111111                                   'portd direction 0=OUTPUT 1=INPUT
PORTD = 110000                                   'portd preset
TRISE = 001111                                   'porte direction 0=OUTPUT 1=INPUT
PORTE = 000000                                   'porte preset




'*********************** TIMER CONFIG ***************************




'********************* INTERRUPT CONFIG *************************




'****************************************************************
'*******************    MAIN PROGRAM     ************************
'****************************************************************
pause 500
lcdout $fe, $01                                     
while 1
    high porta.0
    high porta.1
    high porta.2
    high porta.3
    lcdout $fe, $80, bin8 porta
    lcdout $fe, $c0, "HIGH"
    PAUSE 1000
    low porta.0
    low porta.1
    low porta.2
    low porta.3
    lcdout $fe, $80, bin8 porta
    lcdout $fe, $c0, "LOW "
    PAUSE 1000
    porta.0 = 1
    porta.1 = 1
    porta.2 = 1
    porta.3 = 1
    lcdout $fe, $80, bin8 porta
    lcdout $fe, $c0, "= 1 "
    PAUSE 1000
    porta.0 = 0
    porta.1 = 0
    porta.2 = 0
    porta.3 = 0
    lcdout $fe, $80, bin8 porta
    lcdout $fe, $c0, "= 0 "
    PAUSE 1000
wend


'****************************************************************
'*******************     SUB ROUTINES      **********************
'****************************************************************




'****************************************************************
'*****************     INTERRUPT ROUTINE     ********************
'****************************************************************


end
  2. - 22nd January 2015, 15:17 #2
    Dave's Avatar
    Dave
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    Default Re: porta.0 and porta.2 only goes high with HIGH command with PIC18F45K80

    Bmoe79, I notice that you are only setting 6 of the 8 bits of each port as well as not setting up the statement as: PORTE = %00000000 The "%" has to proceed the binary representation of the bit values to be valid. I notice you do not use it in any of your statements for setting the TRIS or PORT values.
    Dave Purola,
    N8NTA
    EN82fn
  3. - 22nd January 2015, 16:27 #3
    bmoe79's Avatar
    bmoe79
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    Default Re: porta.0 and porta.2 only goes high with HIGH command with PIC18F45K80

    How weird, in the code everything is ok so it must have happened when I pasted the code.
    Here is the code again

    Code:
    ' PIC18F45K80 Configuration Bit Settings


#CONFIG
    CONFIG RETEN = OFF
    CONFIG INTOSCSEL = HIGH
    CONFIG SOSCSEL = DIG
    CONFIG XINST = OFF
    CONFIG FOSC = EC3
    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 CANMX = PORTB
    CONFIG MSSPMSK = MSK7
    CONFIG MCLRE = ON
    CONFIG STVREN = OFF
    CONFIG BBSIZ = BB2K
    CONFIG CP0 = OFF
    CONFIG CP1 = OFF
    CONFIG CP2 = OFF
    CONFIG CP3 = OFF
    CONFIG CPB = OFF
    CONFIG CPD = OFF
    CONFIG WRT0 = OFF
    CONFIG WRT1 = OFF
    CONFIG WRT2 = OFF
    CONFIG WRT3 = OFF
    CONFIG WRTC = OFF
    CONFIG WRTB = OFF
    CONFIG WRTD = OFF
    CONFIG EBTR0 = OFF
    CONFIG EBTR1 = OFF
    CONFIG EBTR2 = OFF
    CONFIG EBTR3 = OFF
    CONFIG EBTRB = OFF
#ENDCONFIG


'************************* DEFINES ******************************
define OSC 64


define LCD_DREG PORTC
define LCD_DBIT 0
define LCD_RSREG PORTC
define LCE_RSBIT 4
define LCD_EREG PORTC
define LCD_EBIT 5
define LCD_BITS 4
define LCD_LINES 2
define LCD_COMMANDUS 3000
define LCD_DATAUS 100


'************************ REGISTERS *****************************
ANCON0 = 000000
ANCON1 = 000000
ADCON0 = 000000
ADCON1 = 000000


'*********************** PORT CONFIG ****************************
TRISA = 100000                                   'porta direction 0=OUTPUT 1=INPUT
PORTA = 000000                                   'porta preset
TRISB = 010111                                   'portb direction 0=OUTPUT 1=INPUT
PORTB = 000000                                   'portb preset
TRISC = 000000                                   'portc direction 0=OUTPUT 1=INPUT
PORTC = 000000                                   'portc preset
TRISD = 111111                                   'portd direction 0=OUTPUT 1=INPUT
PORTD = 110000                                   'portd preset
TRISE = 001111                                   'porte direction 0=OUTPUT 1=INPUT
PORTE = 000000                                   'porte preset


'****************************************************************
'*******************    MAIN PROGRAM     ************************
'****************************************************************
pause 500
lcdout $fe, $01                                     
while 1
    high porta.0
    high porta.1
    high porta.2
    high porta.3
    lcdout $fe, $80, bin8 porta
    lcdout $fe, $c0, "HIGH"
    PAUSE 1000
    low porta.0
    low porta.1
    low porta.2
    low porta.3
    lcdout $fe, $80, bin8 porta
    lcdout $fe, $c0, "LOW "
    PAUSE 1000
    porta.0 = 1
    porta.1 = 1
    porta.2 = 1
    porta.3 = 1
    lcdout $fe, $80, bin8 porta
    lcdout $fe, $c0, "= 1 "
    PAUSE 1000
    porta.0 = 0
    porta.1 = 0
    porta.2 = 0
    porta.3 = 0
    lcdout $fe, $80, bin8 porta
    lcdout $fe, $c0, "= 0 "
    PAUSE 1000
wend


end
    Last edited by bmoe79; - 22nd January 2015 at 16:41.
  4. - 22nd January 2015, 17:02 #4
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    Default Re: porta.0 and porta.2 only goes high with HIGH command with PIC18F45K80

    Same thing again. So weird.
    TRISx, PORTx, ANCONx and ADCONx is like below in my code

    TRISA = %11100000 'porta direction 0=OUTPUT 1=INPUT
    PORTA = %00000000 'porta preset
    TRISB = %11010111 'portb direction 0=OUTPUT 1=INPUT
    PORTB = %00000000 'portb preset
    TRISC = %00000000 'portc direction 0=OUTPUT 1=INPUT
    PORTC = %00000000 'portc preset
    TRISD = %00111111 'portd direction 0=OUTPUT 1=INPUT
    PORTD = %00110000 'portd preset
    TRISE = %00001111 'porte direction 0=OUTPUT 1=INPUT
    PORTE = %00000000 'porte preset

    ANCON0 = %00000000
    ANCON1 = %00000000
    ADCON0 = %00000000
    ADCON1 = %00000000
  5. - 22nd January 2015, 17:37 #5
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    Default Re: porta.0 and porta.2 only goes high with HIGH command with PIC18F45K80

    This might be a read-modify-write issue.
    The 18FK4580 has Output Latch registers.
    You should try writing to the port via the LATA register instead of the PORTA register.
    Regards,
    TABSoft
  6. - 22nd January 2015, 17:42 #6
    bmoe79's Avatar
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    Default Re: porta.0 and porta.2 only goes high with HIGH command with PIC18F45K80

    After taking a quick look in the datasheet it seems like that coulld be it.
    I will test that tomorrow.
    Thanks.
  7. - 23rd January 2015, 15:39 #7
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    Default Re: porta.0 and porta.2 only goes high with HIGH command with PIC18F45K80

    You don't say what you've got hooked up to the port pins. Could you post a schematic?
  8. - 23rd January 2015, 18:55 #8
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    Default Re: porta.0 and porta.2 only goes high with HIGH command with PIC18F45K80

    Make sure to disable comparators & ECCP module. Using HIGH /LOW commands disables all analog (generally) for you. PICs default to Analog inputs and you have to be sure to turn it all off to get digital to work. And it makes sense too, analog inputs are incapable of causing any "unintended" actions downstream, like shorting something out or causing a machine to suddenly start running on power up. It is for THAT reason you should set your port states prior to assigning TRIS to outputs.
    If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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  9. - 27th January 2015, 09:34 #9
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    Default Re: porta.0 and porta.2 only goes high with HIGH command with PIC18F45K80

    Setting the outputs with latx.x instead of portx.x solved the problem.
    Tanks.
  10. - 27th January 2015, 13:57 #10
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    Default Re: porta.0 and porta.2 only goes high with HIGH command with PIC18F45K80

    Glad to hear this got you moving ahead.

    There are plenty of posts on this forum regarding read-modify-write as well as a straight internet search on the subject if you want to understand the issue better.
    Regards,
    TABSoft
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