I’ve just merged a possible implementation of the DRC rules. I’d like to get some feedback on it, and also some testing. (Because the rules support such a wide range of possibilities it’s going to need a good deal of testing.)
For now, it picks up DRC rules from a file named “drc-rules” in the project directory. There’s no GUI editor at present: use a text editor. Grammar is s-expr. It generally follows the ideas set down here: https://docs.google.com/document/d/1qvCH9aHwCzp5qtKTna4jJXuloNU0b96gAxAHSKPuXpU <https://docs.google.com/document/d/1qvCH9aHwCzp5qtKTna4jJXuloNU0b96gAxAHSKPuXpU> with one major exception: I found the select-a-single-rule didn’t pan out. You have to duplicate too much stuff in each rule for that. Also, because the DRC engine (and zone filler) don’t currently support min/opt/max the prototype implements min with Seth’s “relaxed” option. Top level is a list; first expression must be (version x) followed by any number of (selector…) and (rule…) expressions. /* * Match tokens: * match_netclass * match_type * match_layer * match_all * match_area (not yet implemented with the exception of “$board”, which matches everything) * * (selector (match_area "$board") (rule "OSHParkClass3") (priority 100)) * * (selector (match_netclass "HV") (rule "HV_internal")) * (selector (match_netclass "HV") (match_layer "F_Cu") (rule "HV_external")) * (selector (match_netclass "HV") (match_layer "B_Cu") (rule "HV_external")) * * (selector (match_netclass "HV") (match_netclass "HV") (rule "HV2HV")) * (selector (match_netclass "HV") (match_netclass "HV") (match_layer "F_Cu") (rule "HV2HV_external")) * (selector (match_netclass "HV") (match_netclass "HV") (match_layer "B_Cu") (rule "HV2HV_external")) * * TODO: pads for connector pins or wire pads have even larger required creepage clearances. How to encode? * User attributes on parent footprint? * * (selector (match_netclass "HV") (match_type "pad") (match_netclass "HV") (match_type "pad") (rule "pad2PadHV")) * * (selector (match_netclass "signal") (match_area "BGA") (rule "neckdown")) * * Type tokens: * track * via * micro_via * blind_via * pad * zone * text * graphic * board_edge * hole * npth * pth * * Rule tokens: * allow (not yet implemented) * clearance * annulus_width * track_width * hole * * Rule modifiers: * relaxed * * (rule "HV" (clearance 200) (priority 200)) * (rule "HV_external" (clearance 400) (priority 200)) * (rule "HV2HV" (clearance 200) (priority 200)) * (rule "HV2HV_external" (clearance 500) (priority 200)) * (rule "pad2padHV" (clearance 500) (priority 200)) * * (rule "signal" (clearance 20)) // implied priority of 1 * (rule "neckdown" (clearance relaxed 15) (priority 2)) * * (rule "allowMicrovias" (allow microvia)) */
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