diff --git a/dfu-windows.c b/dfu-windows.c
index 4432de0..07f8a93 100644
--- a/dfu-windows.c
+++ b/dfu-windows.c
@@ -347,7 +347,7 @@ static const char *identify()
 // Return the first path found (dynamically allocated).
 // Return 0 when no device with such GUID is present.
 //
-static char *find_path(GUID *guid)
+static char *find_path_for_guid(GUID *guid)
 {
     char *path = 0;
 
@@ -392,7 +392,7 @@ const char *dfu_init(unsigned vid, unsigned pid)
 
     // Find path for device.
     if (vid == 0x0483 && pid == 0xdf11) {
-        path = find_path(&guid_0483_df11);
+        path = find_path_for_guid(&guid_0483_df11);
     } else {
         fprintf(stderr, "No guid for vid=%04x, pid=%04x!\n", vid, pid);
         exit(-1);
diff --git a/serial.c b/serial.c
index 7de9f0d..0ca4fb0 100644
--- a/serial.c
+++ b/serial.c
@@ -357,7 +357,7 @@ int serial_open(const char *devname, int baud_rate)
 //
 // Find a device path by vid/pid.
 //
-static char *find_path(int vid, int pid)
+char *find_path(int vid, int pid)
 {
     char *result = 0;
 
@@ -671,7 +671,7 @@ void serial_close()
 // Query and return the device identification string.
 // On error, return NULL.
 //
-const char *serial_identify()
+const char *serial_identify(char* dev_path)
 {
     static unsigned char reply[16];
     unsigned char ack[3];
diff --git a/src/lib.rs b/src/lib.rs
index a59e139..965bcd7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,7 +6,7 @@ use libc::{c_int, c_char};
 use getopts::Options;
 use std::process::exit;
 
-
+mod serial;
 mod radio;
 
 const COPYRIGHT: &'static str = "Copyright (C) 2018 Serge Vakulenko KK6ABQ";
diff --git a/src/radio.rs b/src/radio.rs
index 33a9798..c29976d 100644
--- a/src/radio.rs
+++ b/src/radio.rs
@@ -45,8 +45,7 @@ extern {
   fn hid_identify() -> *const c_char;
   fn hid_close();
 
-  fn serial_init(vid: c_int, pid: c_int) -> c_int;
-  fn serial_identify() -> *const c_char;
+  fn serial_identify(s: *const c_char) -> *const c_char;
   fn serial_close();
 }
 
@@ -78,8 +77,10 @@ pub fn connect() -> Radio {
 
     if ident.is_null() {
       // Try AT-D868UV.
-      if serial_init(0x28e9, 0x018a) >= 0 {
-        ident = serial_identify();
+      let trace_flag = false; //TODO fix
+      if let Some(device_path) = crate::serial::serial_init(0x28e9, 0x018a, trace_flag) {
+        let ptr = device_path.as_ptr() as *mut c_char;
+        ident = serial_identify(ptr);
       }
     }
 
diff --git a/src/serial.rs b/src/serial.rs
new file mode 100644
index 0000000..7162a76
--- /dev/null
+++ b/src/serial.rs
@@ -0,0 +1,33 @@
+use std::ffi::{CStr};
+use libc::{c_char};
+
+extern {
+  fn find_path(vid: libc::c_int, pid: libc::c_int) -> *const c_char;
+}
+
+/// Connect to the specified device.
+/// Initiate the programming session.
+pub fn serial_init(vid: u32, pid: u32, trace_flag: bool) -> Option<String> {
+    let dev_path = unsafe { find_path(vid as i32, pid as i32) };
+
+    if dev_path.is_null() {
+      if trace_flag {
+        eprintln!("Cannot find USB device: {:#x}{:#x}", vid, pid);
+      }
+      return None;
+    }
+
+    let dev_path = unsafe { CStr::from_ptr(dev_path).to_str().unwrap().to_string() };
+    println!("Serial port: {}", dev_path);
+    Some(dev_path)
+}
+
+/*
+/// Query and return the device identification string.
+/// On error, return None.
+//
+pub fn serial_identify(dev_path: &str) -> Option<String> {
+
+
+}
+*/
diff --git a/util.h b/util.h
index adedad6..7a8b7f0 100644
--- a/util.h
+++ b/util.h
@@ -93,11 +93,12 @@ void hid_write_finish(void);
 //
 // Serial functions.
 //
-int serial_init(int vid, int pid);
-const char *serial_identify(void);
+//int serial_init(int vid, int pid);
+//const char *serial_identify(void);
 void serial_close(void);
 void serial_read_region(int addr, unsigned char *data, int nbytes);
 void serial_write_region(int addr, unsigned char *data, int nbytes);
+char *find_path(int vid, int pid);
 
 //
 // Delay in milliseconds.