Use arduino-cli built uf2 file if available

Author: jepler

Diff for: .github/workflows/githubci.yml

@@ -16,5 +16,5 @@ jobs:
       run: bash ./actions_install.sh
     - name: test platforms
       run: |
-        python3 build_platform.py uno leonardo mega2560 zero esp8266 esp32 pico_rp2040
+        python3 build_platform.py uno leonardo mega2560 zero esp8266 esp32 pico_rp2040 feather_m4_express
 

Diff for: build_platform.py

@@ -248,6 +248,12 @@ def run_or_die(cmd, error):
 
 ################################ UF2 Utils.
 
+def glob01(pattern):
+    result = glob.glob(pattern)
+    if len(result) > 1:
+        raise RuntimeError(f"Required pattern {pattern} to match at most 1 file, got {result}")
+    return result[0] if result else None
+
 def glob1(pattern):
     result = glob.glob(pattern)
     if len(result) != 1:
@@ -276,11 +282,23 @@ def generate_uf2(example_path):
     """
     if not download_uf2_utils():
         return None
-    cli_build_path = "build/*.*." + fqbn.split(':')[2] + "/*.hex"
-    input_file = glob1(os.path.join(example_path, cli_build_path))
-    output_file = os.path.splitext(input_file)[0] + ".uf2"
+
+    cli_build_uf2_path = "build/*.*." + fqbn.split(':')[2] + "/*.uf2"
+    uf2_input_file = glob01(os.path.join(example_path, cli_build_uf2_path))
+
+    # Some platforms, like rp2040, directly generate a uf2 file, so no need to do it ourselves
+    if uf2_input_file is not None:
+        output_file = os.path.splitext(uf2_input_file)[0] + ".uf2"
+        ColorPrint.print_pass(CHECK)
+        ColorPrint.print_info("Used uf2 generated by arduino-cli")
+        return output_file
+
+    # For other uf2-supporting platforms, we can generate it from a hex file
+    cli_build_hex_path = "build/*.*." + fqbn.split(':')[2] + "/*.hex"
+    hex_input_file = glob1(os.path.join(example_path, cli_build_hex_path))
+    output_file = os.path.splitext(hex_input_file)[0] + ".uf2"
     family_id = ALL_PLATFORMS[platform][1]
-    cmd = ['python3', 'uf2conv.py', input_file, '-c', '-f', family_id, '-o', output_file]
+    cmd = ['python3', 'uf2conv.py', hex_input_file, '-c', '-f', family_id, '-o', output_file]
     proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     r = proc.wait(timeout=60)
     out = proc.stdout.read()