Trace G-Code Output

When debugging a post-processor, it is often required to know which GPP program line generated a specific G-code output. The TRACE_LINENO system variable is used for that purpose.

When TRACE_LINENO is set to TRUE_, GPP2 will print the program line number before any actual output characters.

Example

[L0050] %                           // printed by line 50

[L0067] G00 X15. Y36.473 Z0.0       // printed by line 67

It is also possible to trace the toolpath block number where each G-code output was generated. That can be achieved by setting the TRACE_TPBLOCK variable to TRUE_.

Examples:

[B000100] G00 X15                   // printed in TP block 100

Both trace variables may be set simultaneously to trace the line number and the toolpath block for each G-Code output line. If both are set the following format is used:

[L0085, B000100] G00 X15            // printed in TP block 100 by line 85