The smallest useful script

Every GPC script needs main logic. Zen runs it repeatedly from top to bottom, once per VM cycle.

smallest-useful-script.gpc

main {
    if(get_val(PS5_L2)) {
        set_val(PS5_R1, 100);
    }
}

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What each part does

Function	Purpose
get_val(PS5_L2)	Reads the current L2 value.
set_val(PS5_R1, 100)	Writes a fully pressed R1 to the outgoing report.

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How it runs

1

Read

get_val(PS5_L2) reads the current L2 value.

2

Evaluate

Any nonzero value is true in an if condition.

3

Write

While L2 is active, set_val(PS5_R1, 100) makes the outgoing R1 value fully pressed.

4

Send

At the end of main, Zen finalizes and sends the output report.

This does not create a permanent state. The condition is evaluated again on the next VM cycle.

Can I use more than one main section?

Zen Studio Live accepts more than one main section and merges them into one combined section. Use a single main section in new scripts unless splitting generated source is genuinely useful.