startet canbus implementation

software/boards/iten/valve_node/Kconfig.valve_node

@@ -1,2 +1,18 @@
 config BOARD_VALVE_NODE
-    select SOC_STM32F103XB
+    select SOC_STM32F103XB
+
+mainmenu "Controller Area Network sample application"
+config LOOPBACK_MODE
+	bool "Loopback LOOPBACK_MODE"
+	default n
+	help
+	  Set the can controller to loopback mode.
+	  This allows testing without a second board.
+
+config LOG_CAN_LEVEL
+	int "Log level for CAN"
+	default 3
+	range 0 7
+	help
+	  Set the log level for CAN messages.
+	  0 = None, 1 = Error, 2 = Warning, 3 = Info, 4 = Debug, 5 = Trace, 6 = Debug2, 7 = Debug3