Add proper ld script generation and include path for all examples

.github/add_include.py

@@ -1,5 +1,20 @@
-from os.path import join
+import os.path
 Import("env", "projenv")
+# Rely on the fact that all examples to build_src_filter = +<EXAMPLE_THEY_WANT>
+# And figure out correct include path from that
+src_filter = str(env.subst("$SRC_FILTER"))
+# A string with e.g. "+<ch32v003fun> +<examples/blink>" 
+# rudimentary parsing is fine for CI
+src_filters = src_filter.split("+")
+example_folder = ""
+for filter in src_filters:
+   # cleanup unwanted characters
+   f = filter.replace("<", "", 1).replace(">", "", 1)
+   # starts with "examples" and looks like a path?
+   if f.startswith("examples") and ("/" in f or os.path.sep in f):
+      example_folder = f
+      break
+
 # propagate to all construction environments
 for e in env, projenv, DefaultEnvironment():
-   e.Append(CCFLAGS=[("-I", join("examples", env.subst("$PIOENV")))])
+   e.Append(CCFLAGS=[("-I", example_folder)])

.github/gen_ldscript.py

@@ -1,25 +1,94 @@
 from os.path import join
+import sys
 Import("env")
 
-mcu_package = 1
-target_mcu = 0
-mcu_ld = 0
-linkerscript_cmd = env.Command(
-    join("$BUILD_DIR", "ldscript.ld"),  # $TARGET
-    join(env.subst("$PROJECT_DIR"), "ch32v003fun", "ch32v003fun.ld"),  # $SOURCE
+# Returns TARGET_MCU, MCU_PACKAGE and TARGET_MCU_LD values
+# In the same way that the Makefile would do.
+def get_ld_defines(chip_name: str):
+    target_mcu: str = ""
+    mcu_package: int = 0
+    target_mcu_ld: int = 0
+    if chip_name.startswith("ch32v003"):
+        target_mcu = "CH32V003"
+        target_mcu_ld = 0
+    else:
+        mcu_package = 1
+        if chip_name.startswith("ch32v10"):
+            target_mcu = chip_name.upper()[0:len("ch32v10x")]
+            if "r8" in chip_name:
+                mcu_package = 1
+            elif "c8" in chip_name:
+                mcu_package = 1
+            elif "c6" in chip_name:
+                mcu_package = 2
+            target_mcu_ld = 1
+        elif chip_name.startswith("ch32v20"):
+            target_mcu = chip_name.upper()[0:len("ch32v20x")]
+            if "f8" in chip_name:
+                mcu_package = 1
+            elif "g8" in chip_name:
+                mcu_package = 1
+            elif "k8" in chip_name:
+                mcu_package = 1
+            elif "c8" in chip_name:
+                mcu_package = 1
+            elif "f6" in chip_name:
+                mcu_package = 2
+            elif "k6" in chip_name:
+                mcu_package = 2
+            elif "c6" in chip_name:
+                mcu_package = 2
+            elif "rb" in chip_name:
+                mcu_package = 3
+            elif "gb" in chip_name:
+                mcu_package = 3
+            elif "cb" in chip_name:
+                mcu_package = 3
+            elif "wb" in chip_name:
+                mcu_package = 3
+            target_mcu_ld = 2
+        elif chip_name.startswith("ch32v30"):
+            target_mcu = chip_name.upper()[0:len("ch32v30x")]
+            if "rc" in chip_name:
+                mcu_package = 1
+            elif "vc" in chip_name:
+                mcu_package = 1
+            elif "wc" in chip_name:
+                mcu_package = 1
+            elif "cb" in chip_name:
+                mcu_package = 2
+            elif "fb" in chip_name:
+                mcu_package = 2
+            elif "rb" in chip_name:
+                mcu_package = 2
+            target_mcu_ld = 3
+        else:
+            sys.stdout.write("Unkonwn MCU %s\n" % chip_name)
+            env.Exit(-1)
+    return (target_mcu, mcu_package, target_mcu_ld)
+
+# Retrieve MCU name from selected board info
+board = env.BoardConfig()
+chip_name = str(board.get("build.mcu", "")).lower()
+# retrieve needed macro values
+target_mcu, mcu_package, target_mcu_ld = get_ld_defines(chip_name)
+
+# Let the LD script be generated right before the .elf is built
+env.AddPreAction(
+    "$BUILD_DIR/${PROGNAME}.elf",
     env.VerboseAction(" ".join([
         "$CC",
         "-E",
         "-P",
         "-x",
         "c",
-        "-DTARGET_MCU=%d" % target_mcu,
+        "-DTARGET_MCU=%s" % target_mcu,
         "-DMCU_PACKAGE=%d" % mcu_package,
-        "-DTARGET_MCU_LD=%d" % mcu_ld,
-        "$SOURCE" 
+        "-DTARGET_MCU_LD=%d" % target_mcu_ld,
+        join("ch32v003fun", "ch32v003fun.ld"),
         ">",
-        "$TARGET"
-    ]), "Generating linkerscript $BUILD_DIR/ldscript.ld")
+        join("$BUILD_DIR", "ldscript.ld")
+    ]), "Building %s" % join("$BUILD_DIR", "ldscript.ld"))
 )
-env.Depends("$BUILD_DIR/${PROGNAME}.elf", linkerscript_cmd)
+# Already put in the right path for the to-be-generated file
 env.Replace(LDSCRIPT_PATH=join("$BUILD_DIR", "ldscript.ld"))