How to drive 7 segment using multiple ports?


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  1. #1
    guess79's Avatar
    guess79 Guest

    Default How to drive 7 segment using multiple ports?

    Dear All, How can I drive 7 segment display with 16F84 using multiple ports (portA.0~3 together with PortB.4~7)?

    e.g
    ' A0 : segment a
    ' A1 : segment b
    ' A2 : segment c
    ' A3 : segment d
    ' B4 : segment e
    ' B5 : segment f
    ' B6 : segment g
    ' B7 : segment decimal dot

    Can any one help me with the following code, please

    =================================
    digit var Byte
    mask var Byte
    i var Byte
    TRISB = %00000000
    TRISA = %00000

    loop:

    For i = 0 To 9
    LookUp, digit (0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f), mask
    "PORTA(A0~A3) + PortB(B4~7) " = mask <--------------- send mask munber to both portA+ portB; this is where i have problem!!!!!!
    pause 500
    Next i
    Goto loop
    end
    Last edited by guess79; - 11th December 2006 at 20:06.

  2. #2
    Join Date
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    Regards,

    -Bruce
    tech at rentron.com
    http://www.rentron.com

  3. #3
    Join Date
    Sep 2004
    Location
    montreal, canada
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    look at this
    http://melabs.com/resources/articles/ledart.htm

    and this
    http://www.picbasic.co.uk/forum/showthread.php?t=1044

    EDIT: Seems bruce hit the button at the same time
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.

  4. #4
    Join Date
    Dec 2006
    Location
    WADSWORTH OHIO USA
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    Talking This Worked Great For 8 Digits @20mhz

    EEPROM 0,[129,243,73,97,51,37,5,241,1,49] 'STORE CONSTANTS



    LOOP1: 'DISPLAY T & A
    FOR C = 0 TO 3
    READ T DIG C, PORTB 'GRAB NUMBER AND SET SEGMENTS
    LOOKUP C,[$7F,$BF,$DF,$EF],PORTC 'SET DIGIT
    PAUSE f 'PAUSE ON
    PORTC = $FF 'CLEAR PORT
    NEXT C 'NEXT NUMBER OF 4
    FOR B = 0 TO 3 'LOOP AGAIN FOR SECOND ROW
    READ AS DIG B, PORTB
    LOOKUP B,[$FE,$FD,$FB,$F7],PORTC
    PAUSE f
    PORTC = $FF
    NEXT B
    GOTO LOOP
    Thanks !
    SOMRU
    TWE/TFP/EE

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