Add KiCad 9 schematic, project libraries and datasheetsHEADmaster

Schematic (kicad/), one sheet per function as on ULX3S:
  - power: TLV62569 bucks for +1V1 / +3V3, AP2112K LDO for +2V5
  - usb: USB-C with PTC and TVS, CH347F for JTAG and UART
  - fpga_power, fpga_config, fpga_banks_01/23/67: ECP5 LFE5U-25F caBGA256
    (pin compatible with the 45F), quad SPI flash, 50 MHz CLOCK_50,
    ball assignment as in PINPLAN.md
  - ethernet: RTL8211F gigabit PHY, HR911130A RJ45, shield via 1M || 1nF 2kV
  - sdram: 32 MB W9825G6KH-6
  - hdmi: TMDS from the FPGA (LVCMOS33D), AC coupled, ESD protected
  - user_io: SW, KEY (debounced), LEDR, LEDG, HEX0-HEX3 with DE1 names
  - gpio: two DE1 compatible 2x20 headers (THDB-ADA on GPIO_0),
    Pmod A/B, ESD arrays
  - testpoints: bring-up pads, M3 mounting holes

All parts have LCSC numbers, MPN and manufacturer for JLCPCB assembly;
footprints are cross-checked against the EasyEDA data.

Libraries: ECP5 symbols generated from the Lattice pinout CSVs (kipart),
CH347F, RTL8211F, SM410561N symbols, HR911130A symbol and footprint from
KiCad library merge requests, generator scripts in lib/tools/.

Datasheets of all parts except resistors and capacitors in datasheets/
(manufacturer copyright, not covered by the project licenses).

1 files changed, 44 insertions, 0 deletions

diff --git a/kicad/lib/tools/kicad_sym_grid.py b/kicad/lib/tools/kicad_sym_grid.py
new file mode 100755
index 0000000..de52a8e
--- /dev/null
+++ b/kicad/lib/tools/kicad_sym_grid.py
@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-3.0-or-later
+"""Snap kipart symbol pins onto the 2.54 mm grid.
+
+kipart centres each pin column, which puts columns with an even pin count
+(and box edges) on a 1.27 mm half grid; it also writes float noise such as
+3.55e-15. Pins are moved by half a grid step along their column, and pins
+whose end point is off grid are lengthened so the symbol body stays put.
+
+  kicad_sym_grid.py IN.kicad_sym > OUT.kicad_sym
+"""
+import re
+import sys
+
+
+def on_grid(v):
+    return abs(v / 2.54 - round(v / 2.54)) < 0.004
+
+
+def fix(m):
+    kind, x, y, a = m.group(1), float(m.group(2)), float(m.group(3)), m.group(4)
+    length = float(m.group(5))
+    vertical = a in ("90", "270")
+    if vertical and not on_grid(x):
+        x += 1.27
+    if not vertical and not on_grid(y):
+        y += 1.27
+    if vertical and not on_grid(y):
+        y += 1.27 if y > 0 else -1.27
+        length += 1.27
+    if not vertical and not on_grid(x):
+        x += 1.27 if x > 0 else -1.27
+        length += 1.27
+
+    def f(v):
+        v = round(v, 4)
+        return "0" if v == 0 else f"{v:g}"
+    return f"(pin {kind} (at {f(x)} {f(y)} {a}) (length {f(length)})"
+
+
+text = open(sys.argv[1]).read()
+text = re.sub(r"\(pin ([\w ]+?)\s*\(at ([-\d.e+]+) ([-\d.e+]+) (\d+)\)\s*\(length ([\d.]+)\)",
+              fix, text)
+sys.stdout.write(text)