Add stm32-metapac crate, with codegen in rust

embassy-stm32/gen_features.py

@@ -0,0 +1,36 @@
+import os
+import toml
+from glob import glob
+
+abspath = os.path.abspath(__file__)
+dname = os.path.dirname(abspath)
+os.chdir(dname)
+
+supported_families = [
+    'STM32F4',
+    'STM32L0',
+    'STM32L4',
+    'STM32H7',
+]
+
+# ======= load chip list
+features = {}
+for f in sorted(glob('../stm32-data/data/chips/*.yaml')):
+    # Use the filename to get the chip name. Ultra fast, we don't have to read YAML!
+    name = os.path.splitext(os.path.basename(f))[0]
+    if any((family in name for family in supported_families)):
+        name = name.lower()
+        features[name] = ['stm32-metapac/' + name]
+
+# ========= Update Cargo features
+
+SEPARATOR_START = '# BEGIN GENERATED FEATURES\n'
+SEPARATOR_END = '# END GENERATED FEATURES\n'
+HELP = '# Generated by gen_features.py. DO NOT EDIT.\n'
+with open('Cargo.toml', 'r') as f:
+    cargo = f.read()
+before, cargo = cargo.split(SEPARATOR_START, maxsplit=1)
+_, after = cargo.split(SEPARATOR_END, maxsplit=1)
+cargo = before + SEPARATOR_START + HELP + toml.dumps(features) + SEPARATOR_END + after
+with open('Cargo.toml', 'w') as f:
+    f.write(cargo)