diff --git a/ap/lib/libatext/ext_dev_func.h b/ap/lib/libatext/ext_dev_func.h
new file mode 100644
index 0000000..7a08594
--- /dev/null
+++ b/ap/lib/libatext/ext_dev_func.h
@@ -0,0 +1,33 @@
+#ifndef __EXT_DEV_REGIST_H__
+#define __EXT_DEV_REGIST_H__
+
+#if (APP_OS_TYPE == APP_OS_LINUX)
+
+#include "ext_regist.h"
+#include "softap_api.h"
+
+typedef struct TAG_PCS_USB_INFO
+{
+    char cPrompt;      // prompt after reciving data
+    int32_t iBaudrate; // baudrate
+    char cDatabit;     // data bits, 5, 6, 7, 8
+    char cDebug;       // debug mode, 0: none, 1: debug
+    char cEcho;        // echo mode, 0: none, 1: echo
+    char cFctl;        // flow control, 0: none, 1: hardware, 2: software
+    char cTty;         // tty: 0, 1, 2, 3, 4, 5, 6, 7
+    char cParity;      // parity 0: none, 1: odd, 2: even
+    char cStopbit;     // stop bits, 1, 2
+    int32_t iReserved; // reserved, must be zero
+}T_PCS_USB_INFO, *PT_PCS_USB_INFO;
+
+typedef enum{
+    AUTO_MODE,
+    SET_MODE
+}USB_PORT_MODE;
+
+void vFnSetUsbInfo(int32_t iFdCom, const PT_PCS_USB_INFO ptPortInfo, USB_PORT_MODE usbPortMode);
+extern T_PCS_USB_INFO s_tUsbInfo;
+
+#endif
+
+#endif /*__EXT_DEV_REGIST_H__*/