add lib_dnr lib_roleswitch

lib_roleswitch/lib_roleswitch/README.txt

@@ -0,0 +1,15 @@
+
+module_roleswitch
+*****************
+
+scope:
+   General Use
+
+description:
+   Roleswitch helper functions
+
+keywords:
+   Apple, USB, roleswitch, MFI
+
+boards:
+   XK-USB-AUDIO-U8-2C

lib_roleswitch/lib_roleswitch/include/roleswitchflag.h

@@ -0,0 +1,11 @@
+
+#define USB_IN_FLAG   0x11AA
+#define COAX_IN_FLAG  0x22BB
+#define OPT_IN_FLAG   0x33CC
+#define UAC1_IN_FLAG  0x44DD
+#define BT_IN_FLAG    0x55EE
+#define I2S_IN_FLAG   0x66FF
+
+
+void SetRoleSwitchFlag(unsigned flagVal);
+unsigned GetRoleSwitchFlag();

lib_roleswitch/lib_roleswitch/lib_build_info.cmake

@@ -0,0 +1,6 @@
+set(LIB_NAME lib_roleswitch)
+set(LIB_VERSION 0.0.1)
+set(LIB_INCLUDES include)
+set(LIB_COMPILER_FLAGS -Os)
+
+XMOS_REGISTER_MODULE()

lib_roleswitch/lib_roleswitch/src/roleswitchflag.xc

@@ -0,0 +1,22 @@
+#if defined(__XS2A__)
+/* Note range 0x7FFC8 - 0x7FFFF guarenteed to be untouched by tools */
+#define FLAG_ADDRESS 0x7ffc8
+#else
+/* Note range 0xFFFC8 - 0xFFFFF guarenteed to be untouched by tools */
+#define FLAG_ADDRESS 0xfffc8
+#endif
+
+
+/* Store Flag to fixed address */
+void SetRoleSwitchFlag(unsigned x)
+{
+    asm volatile("stw %0, %1[0]" :: "r"(x), "r"(FLAG_ADDRESS));
+}
+
+/* Load flag from fixed address */
+unsigned GetRoleSwitchFlag()
+{
+    unsigned x;
+    asm volatile("ldw %0, %1[0]" : "=r"(x) : "r"(FLAG_ADDRESS));
+    return x;
+}