Rename "sam" development platform to "atmelsam"

platformio/boards/arduino.json

@@ -550,7 +550,7 @@
             "ldscript": "sam3x8e.ld"
         },
         "name": "Arduino Due (Programming Port)",
-        "platform": "sam",
+        "platform": "atmelsam",
         "upload": {
             "disable_flushing": true,
             "maximum_ram_size": 524288,

platformio/builder/scripts/frameworks/arduino.py

@@ -19,7 +19,7 @@ BOARD_BUILDOPTS = env.get("BOARD_OPTIONS", {}).get("build", {})
 # Atmel SAM platform
 #
 
-if env.get("BOARD_OPTIONS", {}).get("platform", None) == "sam":
+if env.get("BOARD_OPTIONS", {}).get("platform", None) == "atmelsam":
     env.VariantDir(
         join("$BUILD_DIR", "FrameworkCMSISInc"),
         join("$PLATFORMFW_DIR", "system", "CMSIS", "CMSIS", "include")

platformio/platforms/atmelsam.py

@@ -4,7 +4,7 @@
 from platformio.platforms.base import BasePlatform
 
 
-class SamPlatform(BasePlatform):
+class AtmelsamPlatform(BasePlatform):
 
     """
         An embedded platform for Atmel SAM microcontrollers