R2 底板改 4 层（D15）：规则 / 几何 / 背面摆位 / 4 层布线与铺铜，已下发

- 规则：铜层 2→4，差分 0.28/0.18，间距 0.15，过孔 0.3/0.2（rules_base）
- 几何：98×98 板框 + 4×M3，槽阵居中，L1 12V 大铜 + 指头（pcb_base）
- 摆位：五插槽留 L1，其余 133 件翻到 L4；背面镜像规则实测；Hub 放走廊 2、
  东移 2.5 mm；扇出圈 / 小件间距 1.5（去耦例外）/ 9 A 过孔阵禁区（place_base）
- 叠层按用户决定改为 L1 槽面 / L2 整层 +3V3 / L3 整层 GND / L4 器件面
- 布线：D± 七对按构造布通（USB3 掉头、USB1/2 北去掉头、USB4/5 东绕、
  J23 桥），+3V3 / GND / +12V 平面网每脚一孔，0.125 网格 + PathFinder
  开关（route_base、remote_route.ps1）；剩 37 个网待手工补
- 铺铜：4 层重写，入口链自南向北切段 + 断面校核（pour_base）；
  已下发布线 / 缝合孔 / 铜面轮廓，填铜未成功（待查）
- 工具：plot_base / plot_routes / shot_base，board_check 通孔两层都算

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_0168Bu6SEx3cXXCJLkdnE6zB

.claude/_esp32_pinmap.json

@@ -28,32 +28,26 @@
   "EFUSE_EN2": 5,
   "EFUSE_EN3": 6,
   "EFUSE_EN4": 7,
-  "SCL": 8,
+  "EFUSE_EN5": 12,
+  "FAN_PWM": 24,
+  "FAN_TACH": 25,
+  "IOEXP_INT#": 31,
+  "KEY_OE#": 23,
+  "KEY_RCLK": 11,
   "KEY_SER": 9,
   "KEY_SRCLK": 10,
-  "KEY_RCLK": 11,
-  "EFUSE_EN5": 12,
+  "NTC1": 39,
+  "NTC2": 38,
+  "SCL": 8,
+  "SDA": 22,
+  "UP_VBUS_DET": 36,
   "VBUS_EN1": 17,
   "VBUS_EN2": 18,
   "VBUS_EN3": 19,
   "VBUS_EN4": 20,
-  "VBUS_EN5": 21,
-  "SDA": 22,
-  "KEY_OE#": 23,
-  "FAN_PWM": 24,
-  "FAN_TACH": 25,
-  "IOEXP_INT#": 31,
-  "UP_VBUS_DET": 36,
-  "NTC2": 38,
-  "NTC1": 39
+  "VBUS_EN5": 21
  },
  "pin2io": {
-  "4": "IO4",
-  "5": "IO5",
-  "6": "IO6",
-  "7": "IO7",
-  "8": "IO15",
-  "9": "IO16",
   "10": "IO17",
   "11": "IO18",
   "12": "IO8",
@@ -67,12 +61,56 @@
   "24": "IO47",
   "25": "IO48",
   "31": "IO38",
-  "36": "IO44",
-  "38": "IO2",
-  "39": "IO1",
   "32": "IO39",
   "33": "IO40",
   "34": "IO41",
-  "35": "IO42"
+  "35": "IO42",
+  "36": "IO44",
+  "38": "IO2",
+  "39": "IO1",
+  "4": "IO4",
+  "5": "IO5",
+  "6": "IO6",
+  "7": "IO7",
+  "8": "IO15",
+  "9": "IO16"
+ },
+ "r2_base": {
+  "EFUSE_EN1": 21,
+  "EFUSE_EN2": 20,
+  "EFUSE_EN3": 19,
+  "EFUSE_EN4": 18,
+  "EFUSE_EN5": 17,
+  "FAN_EN": 7,
+  "FAN_PWM": 6,
+  "FAN_TACH_IN": 5,
+  "FAN_TACH_OUT": 4,
+  "HUB_RST": 12,
+  "INA_ALERT": 31,
+  "INT#": 32,
+  "IO0": 27,
+  "MUX_RST#": 33,
+  "NTC1": 39,
+  "NTC2": 38,
+  "PRSNT1#": 11,
+  "PRSNT2#": 10,
+  "PRSNT3#": 9,
+  "PRSNT4#": 8,
+  "PRSNT5#": 22,
+  "SCL": 35,
+  "SDA": 34,
+  "UP_VBUS_DET": 23,
+  "USB6_DM": 13,
+  "USB6_DP": 14
+ },
+ "r2_base_nc": {
+  "15": "IO3  strapping(JTAG_SEL)",
+  "16": "IO46 strapping + input-only",
+  "24": "IO47 备用",
+  "25": "IO48 备用",
+  "26": "IO45 strapping(VDD_SPI)",
+  "28": "IO35 留给 R8 版八线 PSRAM",
+  "29": "IO36 同上",
+  "30": "IO37 同上"
  }
 }