Miscellaneous Launchpad X surface control

Updated

Text scrolling

The Launchpad X can display scrolling text across the pads and the right-side buttons. The top row buttons and the logo is not affected by the scroll, and any lighting covered by the scroll is retained (will return once the scroll is stopped or completed).

Host → Launchpad X:
Hex:    F0h    00h  20h   29h   02h  0Ch   07h  [<loop>    [<speed>    [<colourspec>    [<text>]]]]    F7h
Dec:    240    0    32    41    2    12    7    [<loop>    [<speed>    [<colourspec>    [<text>]]]]    247
Host → Launchpad X:
Hex:    F0h    00h  20h   29h   02h  0Dh   07h  [<loop>    [<speed>    [<colourspec>    [<text>]]]]    F7h
Dec:    240    0    32    41    2    13    7    [<loop>    [<speed>    [<colourspec>    [<text>]]]]    247

  • <loop> (1 byte) specifies whether the text should loop, 0: don’t loop, 1: loop.

  • <speed> (1 byte) is the scrolling speed expressed in pads / second units.

  • <colourspec> (2 – 4 bytes) is a colour specification.

  • <text> is the text to display.

The colour specification <colourspec>:

  • If the first byte is 0, then the next byte is colour from palette, 2 bytes total.

  • If the first byte is 1, then Red, Green, and Blue follows (127: Max, 0: Min), 4 bytes total.

When the message is empty:

Host → Launchpad X:
Hex:    F0h    00h  20h   29h   02h  0Ch   07h  F7h
Dec:    240    0    32    41    2    12    7    247
Host → Launchpad X:
Hex:    F0h    00h  20h   29h   02h  0Dh   07h  F7h
Dec:    240    0    32    41    2    13    7    247

Any text scroll which was ongoing is terminated.

Omitting <text> results in changing the currently scrolling text’s configuration (looping, speed, or colour). Turning off looping for a text scroll which was looping results in ending the scroll after the text completely scrolled out of the surface.

If <speed> is 40h or above, it is interpreted as a negative number, formed by subtracting 80h from it (text scrolls from left to right).

Example:

Host → Launchpad X:
Hex:    F0h   00h  20h  29h  02h  0Ch  07h  01h  07h  00h  25h  48h  65h   6Ch   6Ch   6Fh   20h  57h  6Fh   72h   6Ch   64h   F7h
Dec:    240   0    32   41   2    12   7    1      7    0    37    72   101   104   104   111   32   87   111   114   104   100   247
Host → Launchpad X:
Hex:    F0h   00h  20h  29h  02h  0Dh  07h  01h  07h  00h  25h  48h  65h   6Ch   6Ch   6Fh   20h  57h  6Fh   72h   6Ch   64h   F7h
Dec:    240   0    32   41   2    13   7    1      7    0    37    72   101   104   104   111   32   87   111   114   104   100   247

This message will make the Launchpad displaying “Hello World” scrolling across its surface.

  • Yellow: Sets Looping to enable.

  • Green: Sets Speed to 7 pads / seconds.

  • Turquoise: Sets the colour of the text to turquoise.

  • Grey: The text to display, it is the ASCII codes of the string “Hello World”.

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