ToolingUpdated 2026-07-24

Compiler errors and GPC debugging

Diagnose placement, identifier, type-range, combo-timing, and target-version problems systematically in Zen Studio.

Overview

Start with the first compiler error because later messages may be consequences. Reduce the failing area to a minimal script, then restore code in small verified pieces.

Many failures are structural: a declaration in the wrong section, wait or call outside a combo, a recursive function, an unsupported Zen-only API, or a misspelled identifier.

Key facts

The first reported compiler error is often the most useful.
Compiler and firmware versions can change available functions.
A minimal script should still contain mandatory main.
Warnings about numeric range deserve attention because variables are signed 16-bit integers.

GPC syntax examples

Examples are intentionally small. Replace identifiers only with values documented for your target.

Minimal compile and trace testexample.gpc

main {
    set_val(TRACE_1, get_val(XB1_A));
}

Functions, commands, and terms

Names below are catalog entries, not guessed signatures. Open the official sources for current parameter and return-value details.

NameKindPurpose

mainkeyword

Provides the mandatory loop needed by a minimal compile test.

TRACE_1..TRACE_6constant family

Official trace output identifiers written through set_val.

set_valfunction

Writes a trace identifier or controller output value.

Common mistakes

Fixing the last error before the first.

Testing old code without checking target compatibility.

Calling a nonexistent trace function or using OLED printf as logging.

Changing several unrelated areas between compile attempts.

Official GPC sources

Use these first-party references to confirm exact syntax and runtime behavior for your installed firmware and Studio version.

Official documentationOfficial basic syntaxgpc.cronusmax.com/basic-syntax ↗Official documentationCurrent Cronus Zen GPC guideguide.cronus.support/gpc ↗