Starting Point on a 4x4 switcher?

vegastech · April 2010

What is a better approach for programming a 4x4 switcher? Using a Multi-Dimensional array, like:

NON_VOLATILE INTEGER nMatrixInput [] [] = {
{11,12,13,14},  //outputs 1-4 for input 1
{21,22,23,24},  //outputs 1-4 for input 2
{31,32,33,34},  //outputs 1-4 for input 3
{41,42,43,44},  //outputs 1-4 for input 4

Or using devchans?

DEVCHAN dcSwitcherOut1 [] = { //inputs available for output 1
{dvTPswitch,11},{dvTPswitch,21},{dvTPswitch,31},{dvTPswitch,41}
}
DEVCHAN dcSwitcherOut2 [] = { //inputs available for output 2
{dvTPswitch,51},{dvTPswitch,61},{dvTPswitch,71},{dvTPswitch,81}
}
DEVCHAN dcSwitcherOut3 [] = { //inputs available for output 3
{dvTPswitch,91},{dvTPswitch,101},{dvTPswitch,111},{dvTPswitch,121}
}
DEVCHAN dcSwitcherOut4 [] = { //inputs available for output 1
{dvTPswitch,131},{dvTPswitch,141},{dvTPswitch,151},{dvTPswitch,161}
}

I was hoping to use a get_last on either of these...but where do I go from here? I've tried a stacked button_event with a get_last, but it only seems to propagate when using the first grouping. Every other button press returns a 1 instead of a 1,2,3,or 4.

true · April 2010

In most cases, neither.

Use one array to track your output feedback, and one variable to track your currently operated output. You only need to change this up if you need a matrix display, in which case there are lots of ways to do it depending on how you want switching to work.

DHawthorne · April 2010

I think it depends on the application. It's one thing if it's distributed audio in a home, and another if it's a mixing board in a studio.

In a distributed audio system, I don't use button presses to switch inputs, I use SEND_COMMAND and create a handler in the module to do the work when the end user selects a source. For feedback, I keep a simple array with a position for each zone, and that position in the array indicates what input is active. For example, {1, 2, 2, 0} would mean zone 1 is on input 1, zones 2 & 3 on input 2, and zone 4 is off.

For a mixing board where you need at-a-glance control and feedback for the whole setup, I'd still do the same for feedback, but would only use a single dimension array for the buttons. It's easy enough to calculate from the button channel which output and input you want. Multi-dimensions just get in the way at that point.

Starting Point on a 4x4 switcher?

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