Move the daplink.c contents into header file & force inline.

This frees up about 168 bytes with 10.3.1, which is needed to
fit more features in some bootladers that were alredy at the
.text limit.

Author: microbit-carlos

source/daplink/bootloader/daplink.c

@@ -81,8 +81,46 @@ COMPILER_ASSERT(DAPLINK_RAM_SHARED_START + DAPLINK_RAM_SHARED_SIZE == DAPLINK_RA
 // Macro with the name of the main application header file.
 #if defined(DAPLINK_BL)
 #define DAPLINK_MAIN_HEADER "main_bootloader.h"
+
+#include "virtual_fs.h"
+
+COMPILER_ASSERT(DAPLINK_BUILD_KEY == DAPLINK_BUILD_KEY_BL);
+
+// daplink_mode_file_name, daplink_url_name and
+// daplink_drive_name strings must be 11 characters
+// excluding the null terminated character
+static const char daplink_mode_file_name[11] = "START_IFACT";
+
+__STATIC_FORCEINLINE bool daplink_is_bootloader()
+{
+    return true;
+}
+
+__STATIC_FORCEINLINE bool daplink_is_interface()
+{
+    return false;
+}
+
 #elif defined(DAPLINK_IF)
 #define DAPLINK_MAIN_HEADER "main_interface.h"
+
+#if defined(DRAG_N_DROP_SUPPORT) && !defined(DRAG_N_DROP_DISABLE)
+#include "virtual_fs.h"
+COMPILER_ASSERT(DAPLINK_BUILD_KEY == DAPLINK_BUILD_KEY_IF);
+
+static const vfs_filename_t daplink_mode_file_name = "START_BLACT";
+#endif //DRAG_N_DROP_SUPPORT
+
+__STATIC_FORCEINLINE bool daplink_is_bootloader()
+{
+    return false;
+}
+
+__STATIC_FORCEINLINE bool daplink_is_interface()
+{
+    return true;
+}
+
 #else
 #error "Neither DAPLINK_BL nor DAPLINK_IF are defined!"
 #endif
@@ -93,9 +131,6 @@ typedef struct {
     uint32_t version;
 } daplink_info_t;
 
-bool daplink_is_bootloader(void);
-bool daplink_is_interface(void);
-
 #ifdef __cplusplus
 }
 #endif

source/daplink/daplink.h

@@ -32,9 +32,6 @@
 extern "C" {
 #endif
 
-
-extern const vfs_filename_t daplink_mode_file_name;
-
 /* Callable from anywhere */
 
 // Enable or disable the virtual filesystem