[core] Allow using external framework parts

builder/libs/lwip.py

@@ -0,0 +1,49 @@
+# Copyright (c) Kuba Szczodrzyński 2022-05-18.
+
+from SCons.Script import DefaultEnvironment
+
+env = DefaultEnvironment()
+platform = env.PioPlatform()
+
+
+def env_add_lwip(
+    env,
+    version: str,
+    port: str,
+):
+    # version = env["LIB_LWIP_VERSION"] if "LIB_LWIP_VERSION" in env else version_default
+    package_dir = platform.get_package_dir(f"library-lwip@{version}-{port}")
+    port_srcs = []
+    port_includes = []
+
+    if port in ["amb1"]:
+        port_srcs = [
+            "+<port/realtek/freertos/ethernetif.c>",
+            "+<port/realtek/freertos/sys_arch.c>",
+        ]
+        port_includes = [
+            "+<port/realtek>",
+            "+<port/realtek/freertos>",
+        ]
+
+    env.AddLibrary(
+        name=f"lwip{version}_{port}",
+        base_dir=package_dir,
+        srcs=[
+            "+<src/api/*.c>",
+            "+<src/core/*.c>",
+            "+<src/core/ipv4/*.c>",
+            "+<src/netif/ethernet.c>",  # 2.0.x
+            "+<src/netif/etharp.c>",  # 1.4.x
+            *port_srcs,
+        ],
+        includes=[
+            "+<src/include>",
+            "+<src/include/lwip>",
+            "+<src/include/ipv4>",
+            *port_includes,
+        ],
+    )
+
+
+env.AddMethod(env_add_lwip, "AddLibraryLwIP")

builder/main.py

@@ -7,6 +7,8 @@ board = env.BoardConfig()
 
 # Utilities
 env.SConscript("utils.py", exports="env")
+# Vendor-specific library ports
+env.SConscript("libs/lwip.py", exports="env")
 
 # Firmware name
 if env.get("PROGNAME", "program") == "program":