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Graphics Demo for TV — Parallax Forums

Graphics Demo for TV

NewzedNewzed Posts: 2,503
edited 2006-10-21 13:26 in Propeller 1
All of a sudden my Graphics Demo won't work.· I may have corrupted it.· Could some one please post a clean working copy of Graphics_Demo and its two objects.· Thanks very much.

Sid

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Sid Weaver
Don't have VGA?

Newzed@aol.com
·

Comments

  • Cliff L. BiffleCliff L. Biffle Posts: 206
    edited 2006-10-20 23:43
    They're in the Propeller Object Library.

    I'd post a link, but the links in the Object Library usually bring up the wrong file for me if I wait more than a minute or two -- so I worry it'd become stale.
  • Mike CookMike Cook Posts: 829
    edited 2006-10-21 01:41
    From the Propeller Tool v1.0

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    Mike
    zip
    zip
    Graphics_Demo - Archive [Date 2006.10.20 Time 20.40].zip
    29K
  • NewzedNewzed Posts: 2,503
    edited 2006-10-21 11:49
    The program compiled and loaded but no TV display.· Where are the pins for the TV connection defined?· I think that is my problem.

    Sid

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    Sid Weaver
    Don't have VGA?

    Newzed@aol.com
    ·
  • Graham StablerGraham Stabler Posts: 2,510
    edited 2006-10-21 12:13
    In the graphics demo:

    tvparams             
                              long    %001_0101       'pins



    From the TV object:

    ''  tv_pins
''
''    bits 6..4 select pin group:
''      %000: pins 7..0
''      %001: pins 15..8
''      %010: pins 23..16
''      %011: pins 31..24
''      %100: pins 39..32
''      %101: pins 47..40
''      %110: pins 55..48
''      %111: pins 63..56
''
''    bits 3..0 select pin group mode:
''      %0000: %0000_0111    -                    baseband
''      %0001: %0000_0111    -                    broadcast
''      %0010: %0000_1111    -                    baseband + chroma
''      %0011: %0000_1111    -                    broadcast + aural
''      %0100: %0111_0000    broadcast            -
''      %0101: %0111_0000    baseband             -
''      %0110: %1111_0000    broadcast + aural    -
''      %0111: %1111_0000    baseband + chroma    -
''      %1000: %0111_0111    broadcast            baseband
''      %1001: %0111_0111    baseband             broadcast
''      %1010: %0111_1111    broadcast            baseband + chroma
''      %1011: %0111_1111    baseband             broadcast + aural
''      %1100: %1111_0111    broadcast + aural    baseband
''      %1101: %1111_0111    baseband + chroma    broadcast
''      %1110: %1111_1111    broadcast + aural    baseband + chroma
''      %1111: %1111_1111    baseband + chroma    broadcast + aural
''      -----------------------------------------------------------
''            active pins    top nibble           bottom nibble
''
''      the baseband signal nibble is arranged as:
''        bit 3: chroma signal for s-video (attach via 560-ohm resistor)
''        bits 2..0: baseband video (sum 270/560/1100-ohm resistors to form 75-ohm 1V signal)
''
''      the broadcast signal nibble is arranged as:
''        bit 3: aural subcarrier (sum 560-ohm resistor into network below)
''        bits 2..0: visual carrier (sum 270/560/1100-ohm resistors to form 75-ohm 1V signal)



    And from the tv_text object:

    tv_pins := (basepin & $38) << 1 | (basepin & 4 == 4) & %0101



    Which I assume creates the correct number given a base pin

    Graham
  • NewzedNewzed Posts: 2,503
    edited 2006-10-21 12:18
    OK - how do I set it up so the TV start pin is Pin 20?

    Sid



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    Sid Weaver
    Don't have VGA?

    Newzed@aol.com
    ·
  • Graham StablerGraham Stabler Posts: 2,510
    edited 2006-10-21 12:41
    OK,

    I don't think you can set pin 20 as the base pin as the pins 20-23 span the possible pin groups.

    Example of working out pins parameter:

    Demoboard uses pins 12-15 that is included in group %001

    The group is 8-15 so choosing group mode means that the used pins in that group are: %0111_0000

    So the mode is selected as: %0101:

    Combining the two gives:

    %001_0101

    Graham
  • Graham StablerGraham Stabler Posts: 2,510
    edited 2006-10-21 12:49
    Correction, it doesn't span

    %010: pins 23..16

    %0101: %0111_0000

    => 010_0101

    Graham
  • NewzedNewzed Posts: 2,503
    edited 2006-10-21 13:08
    Graham, I set pins to %010_0000, moved my connector to Pin 16 and now it works!· Thanks

    Sid

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Sid Weaver
    Don't have VGA?

    Newzed@aol.com
    ·
  • Graham StablerGraham Stabler Posts: 2,510
    edited 2006-10-21 13:26
    if you use 010_0101 you would have to move it even.

    Graham
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