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13.4.1.1 refdes naming restrictions

lepton-schematic will accept any string as a value for the refdes. However, some back-ends to lepton-netlist impose restrictions on the allowed syntax.

Specifically, lepton-sch2pcb requires:

• No spaces.
• No hyphens. This might upset the M4 macro language potentially used to generate footprints. “_” is OK.
• Any lower case suffix is ignored. This is so you can, place four discrete NAND gates on the schematic called U1a, U1b, U1c, and U1d. They will netlist into a single footprint named U1.
• Non-ASCII characters like ‘ü’, ‘ö’, ‘ä’, ‘ß’ will not print in pcb.