Initial library + 694 generated 0402 resistor symbols
Symbols (2 libraries): - symbols/ultra-mini.kicad_sym - symbols/M8Mini.kicad_sym - symbols/Res_0402.kicad_sym (R_temp template + 694 generated symbols) Footprints (33 used in ultra project): - footprints/custom.pretty/ (30 mods) - footprints/M8Mini.pretty/ (3 mods) 3D models (31 STEP/STP files) Scripts: - scripts/extract_symbols.py KiCad 9 symbol metadata extractor - scripts/export_bom.py BOM CSV exporter - scripts/gen_resistors_0402.py 0402 resistor symbol generator from parts list
This commit is contained in:
Brent Perteet
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scripts/gen_resistors_0402.py
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295
scripts/gen_resistors_0402.py
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#!/usr/bin/env python3
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"""
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gen_resistors_0402.py
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=====================
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Reads the approved parts list spreadsheet and generates KiCad 9 symbols
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for every 0402 resistor into kicad-lib/symbols/Res_0402.kicad_sym.
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The existing R_temp template symbol is kept in the file. One new symbol
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is added per row, named by the internal part number (GLE P/N), with:
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Value ← Value1 (e.g. "10k", "4.7k", "100")
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Description ← Description column
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UMPN ← GLE P/N
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MFG ← Mfg.1
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MPN ← Mfg.1 P/N
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All geometry and pin definitions are copied verbatim from R_temp.
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Usage:
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python3 gen_resistors_0402.py <parts_list.xlsx> <Res_0402.kicad_sym>
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"""
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import re
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import sys
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import pandas as pd
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from pathlib import Path
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# ---------------------------------------------------------------------------
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# Helpers
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# ---------------------------------------------------------------------------
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def kicad_str(value: str) -> str:
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"""Escape a string for use inside a KiCad S-expression quoted string."""
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return str(value).replace('\\', '\\\\').replace('"', '\\"')
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def make_symbol(name: str, value: str, description: str,
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umpn: str, mfg: str, mpn: str,
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geometry_body: str) -> str:
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"""
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Render a complete (symbol ...) block.
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geometry_body is the text of the two inner sub-symbols
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(originally named R_temp_0_1 and R_temp_1_1) with the name
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already substituted.
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"""
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return f'''\t(symbol "{kicad_str(name)}"
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\t\t(pin_numbers
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\t\t\t(hide yes)
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\t\t)
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\t\t(pin_names
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\t\t\t(offset 0)
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\t\t)
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\t\t(exclude_from_sim no)
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\t\t(in_bom yes)
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\t\t(on_board yes)
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\t\t(property "Reference" "R"
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\t\t\t(at 2.54 0 90)
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\t\t\t(effects
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\t\t\t\t(font
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\t\t\t\t\t(size 1.27 1.27)
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\t\t\t\t)
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\t\t\t)
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\t\t)
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\t\t(property "Value" "{kicad_str(value)}"
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\t\t\t(at -2.54 0 90)
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\t\t\t(effects
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\t\t\t\t(font
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\t\t\t\t\t(size 1.27 1.27)
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\t\t\t\t)
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\t\t\t)
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\t\t)
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\t\t(property "Footprint" "Resistor_SMD:R_0402_1005Metric"
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\t\t\t(at 1.016 -0.254 90)
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\t\t\t(effects
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\t\t\t\t(font
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\t\t\t\t\t(size 1.27 1.27)
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\t\t\t\t)
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\t\t\t\t(hide yes)
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\t\t\t)
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\t\t)
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\t\t(property "Datasheet" "~"
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\t\t\t(at 0 0 0)
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\t\t\t(effects
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\t\t\t\t(font
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\t\t\t\t\t(size 1.27 1.27)
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\t\t\t\t)
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\t\t\t\t(hide yes)
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\t\t\t)
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\t\t)
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\t\t(property "Description" "{kicad_str(description)}"
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\t\t\t(at 0 0 0)
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\t\t\t(effects
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\t\t\t\t(font
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\t\t\t\t\t(size 1.27 1.27)
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\t\t\t\t)
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\t\t\t\t(hide yes)
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\t\t\t)
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\t\t)
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\t\t(property "MPN" "{kicad_str(mpn)}"
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\t\t\t(at 0 0 0)
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\t\t\t(effects
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\t\t\t\t(font
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\t\t\t\t\t(size 1.27 1.27)
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\t\t\t\t)
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\t\t\t\t(hide yes)
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\t\t\t)
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\t\t)
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\t\t(property "MFG" "{kicad_str(mfg)}"
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\t\t\t(at 0 0 0)
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\t\t\t(effects
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\t\t\t\t(font
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\t\t\t\t\t(size 1.27 1.27)
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\t\t\t\t)
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\t\t\t\t(hide yes)
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\t\t\t)
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\t\t)
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\t\t(property "UMPN" "{kicad_str(umpn)}"
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\t\t\t(at 0 0 0)
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\t\t\t(effects
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\t\t\t\t(font
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\t\t\t\t\t(size 1.27 1.27)
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\t\t\t\t)
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\t\t\t\t(hide yes)
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\t\t\t)
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\t\t)
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\t\t(property "ki_keywords" "R res resistor"
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\t\t\t(at 0 0 0)
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\t\t\t(effects
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\t\t\t\t(font
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\t\t\t\t\t(size 1.27 1.27)
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\t\t\t\t)
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\t\t\t\t(hide yes)
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\t\t\t)
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\t\t)
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\t\t(property "ki_fp_filters" "R_*"
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\t\t\t(at 0 0 0)
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\t\t\t(effects
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\t\t\t\t(font
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\t\t\t\t\t(size 1.27 1.27)
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\t\t\t\t)
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\t\t\t\t(hide yes)
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\t\t\t)
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\t\t)
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{geometry_body}
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\t\t(embedded_fonts no)
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\t)'''
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# ---------------------------------------------------------------------------
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# Extract geometry from R_temp
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# ---------------------------------------------------------------------------
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def extract_geometry(sym_text: str) -> str:
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"""
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Pull out the two inner sub-symbol blocks (R_temp_0_1 and R_temp_1_1)
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from the raw file text and return them as a single string with the
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'R_temp' name prefix replaced by a placeholder that callers substitute.
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"""
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# Match (symbol "R_temp_0_1" ...) and (symbol "R_temp_1_1" ...)
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# by tracking brace depth after the opening paren of each sub-symbol.
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results = []
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for sub in ('R_temp_0_1', 'R_temp_1_1'):
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pattern = f'(symbol "{sub}"'
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start = sym_text.find(pattern)
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if start == -1:
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raise ValueError(f"Could not find sub-symbol '{sub}' in template")
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# Walk forward to find the matching closing paren
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depth = 0
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i = start
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while i < len(sym_text):
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if sym_text[i] == '(':
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depth += 1
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elif sym_text[i] == ')':
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depth -= 1
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if depth == 0:
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results.append(sym_text[start:i + 1])
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break
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i += 1
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return '\n'.join(results)
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# ---------------------------------------------------------------------------
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# Main
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# ---------------------------------------------------------------------------
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def main(xlsx_path: Path, sym_path: Path):
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# ---- Load spreadsheet ----
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df = pd.read_excel(xlsx_path, sheet_name='PCB', dtype=str)
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df = df.fillna('')
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# Filter to 0402 resistors
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mask = (
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df['Footprint'].str.contains('0402', na=False) &
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df['Description'].str.contains('[Rr]es', na=False, regex=True)
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)
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resistors = df[mask].copy()
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print(f"Found {len(resistors)} 0402 resistors in parts list")
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# ---- Read existing symbol file ----
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existing = sym_path.read_text(encoding='utf-8')
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# Extract geometry from R_temp once
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raw_geom = extract_geometry(existing)
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# ---- Build new symbols ----
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new_symbols = []
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skipped = []
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for _, row in resistors.iterrows():
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gle_pn = str(row['GLE P/N']).strip()
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value = str(row['Value1']).strip()
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description = str(row['Description']).strip()
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mfg = str(row['Mfg.1']).strip()
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mpn = str(row['Mfg.1 P/N']).strip()
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if not gle_pn:
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skipped.append(('(no GLE P/N)', value))
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continue
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# Substitute R_temp → this symbol's name in the geometry block.
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# Also re-indent so sub-symbol opening parens align with the template.
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geom = raw_geom.replace('R_temp_0_1', f'{gle_pn}_0_1') \
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.replace('R_temp_1_1', f'{gle_pn}_1_1')
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# Each sub-symbol block starts at column 0 after extract; add two tabs.
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geom = '\n'.join('\t\t' + line if line.startswith('(symbol ') else line
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for line in geom.splitlines())
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sym = make_symbol(
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name=gle_pn,
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value=value,
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description=description,
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umpn=gle_pn,
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mfg=mfg,
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mpn=mpn,
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geometry_body=geom,
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)
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new_symbols.append(sym)
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print(f"Generated {len(new_symbols)} symbols ({len(skipped)} skipped)")
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# ---- Rebuild file from scratch (idempotent) ----
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# Extract the library header lines (everything before the first symbol)
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# and keep only the R_temp template symbol, then append generated symbols.
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header_end = existing.find('\n\t(symbol "R_temp"')
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if header_end == -1:
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raise ValueError("Could not find R_temp template in symbol file")
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header = existing[:header_end]
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# Extract R_temp block by brace depth
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rt_start = existing.index('\n\t(symbol "R_temp"')
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depth, i = 0, rt_start + 1 # skip leading newline
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while i < len(existing):
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if existing[i] == '(':
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depth += 1
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elif existing[i] == ')':
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depth -= 1
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if depth == 0:
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rt_block = existing[rt_start:i + 1]
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break
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i += 1
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lib_body = header + rt_block + '\n' + '\n'.join(new_symbols) + '\n)'
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# Back up original
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backup = sym_path.with_suffix('.bak')
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backup.write_text(existing, encoding='utf-8')
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print(f"Backup written to {backup.name}")
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sym_path.write_text(lib_body, encoding='utf-8')
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print(f"Wrote {sym_path}")
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# Quick sanity check
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symbol_count = lib_body.count('\n\t(symbol "')
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print(f"Total symbols in file (including R_temp): {symbol_count}")
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if __name__ == '__main__':
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if len(sys.argv) == 3:
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xlsx = Path(sys.argv[1])
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sym = Path(sys.argv[2])
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else:
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# Default paths relative to repo root
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repo = Path(__file__).parent.parent
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xlsx = repo.parent / 'parts_list_pcb.xlsx'
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sym = repo / 'symbols' / 'Res_0402.kicad_sym'
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if not xlsx.exists():
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print(f"Error: spreadsheet not found at {xlsx}", file=sys.stderr)
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sys.exit(1)
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if not sym.exists():
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print(f"Error: symbol file not found at {sym}", file=sys.stderr)
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sys.exit(1)
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main(xlsx, sym)
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