diff --git a/.gitignore b/.gitignore
index 8f4c3bc..2b8b572 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,6 +25,7 @@ packages/vsky/libdsp/driver/Uart.h
 packages/vsky/libdsp/lib
 packages/vsky/libdsp/Settings.h
 packages/vsky/libdsp/Uart.h
+packages/vsky/libdsp/Serial.h
 packages/vsky/libdsp/SerialSystem.h
 packages/vsky/libdsp/Interrupt.h
 packages/vsky/libdsp/driver/cfi_flash.orig.c
diff --git a/packages/vsky/libdsp/Serial.c b/packages/vsky/libdsp/Serial.c
new file mode 100644
index 0000000..203e41f
--- /dev/null
+++ b/packages/vsky/libdsp/Serial.c
@@ -0,0 +1,46 @@
+#include <xdc/std.h>
+#include <xdc/runtime/Error.h>
+#include "inc/uart.h"
+#include "package/internal/Serial.xdc.h"
+
+Int Serial_Instance_init(Serial_Object *obj, Int p, const Serial_Params *param, Error_Block *eb)
+{
+    obj->_uart = uart_open(p);
+    if (obj->_uart == NULL) {
+        if (eb) {
+            Error_raise(eb, Error_E_generic, 0, 0);
+        }
+        return -1;
+    }
+    uart_set_baudrate(obj->_uart, param->baudrate);
+    uart_set_databits(obj->_uart, param->databits);
+    uart_set_stopbits(obj->_uart, param->stopbits);
+    return 0;
+}
+
+void Serial_Instance_finalize(Serial_Object *obj, Int state)
+{
+    if (state == 0) {
+        uart_close(obj->_uart);
+    }
+}
+
+UInt8 Serial_Instance_read(Serial_Object *obj)
+{
+    return uart_read(obj->_uart);
+}
+
+void Serial_Instance_write(Serial_Object *obj, UInt8 ch)
+{
+    uart_write(obj->_uart, ch);
+}
+
+Bool Serial_Instance_isReady(Serial_Object *obj)
+{
+    return uart_is_ready(obj->_uart);
+}
+
+Ptr Serial_Instance_uart(Serial_Object *obj)
+{
+    return obj->_uart;
+}
diff --git a/packages/vsky/libdsp/Serial.xdc b/packages/vsky/libdsp/Serial.xdc
new file mode 100644
index 0000000..b931a88
--- /dev/null
+++ b/packages/vsky/libdsp/Serial.xdc
@@ -0,0 +1,52 @@
+@InstanceFinalize
+@InstanceInitError
+module Serial {
+	/*
+	 * Serial Port driver.
+	 */
+instance:
+	config UInt32 baudrate = 115200;
+	config UInt32 databits = 8;
+	config UInt32 stopbits = 1;
+
+	/*!
+	 * Create serial port.
+	 *
+	 * @p(html)
+	 * Serial_Handle h;
+	 * Serial_Params p;
+	 * Serial_Params_init(&p);
+	 *
+	 * h = Serial_create(0, &p);
+	 * if (h != NULL) {
+	 *	 ...
+	 * }
+	 * @p
+	 */
+	create(Int port);
+
+	/*!
+	 * read a byte from serial.
+	 */
+	UInt8 read();
+
+	/*!
+	 * write a byte to serial.
+	 */
+	void  write(UInt8 ch);
+
+    /*!
+	 * data is comming.
+	 *
+	 Bool isReady();
+
+	/*!
+	 * get the lowlevel uart handle.
+	 */
+	 Ptr uart();
+
+internal:
+	@Opaque struct Instance_State {
+		Ptr _uart;
+	};
+}
diff --git a/packages/vsky/libdsp/Serial.xs b/packages/vsky/libdsp/Serial.xs
new file mode 100644
index 0000000..75a60d3
--- /dev/null
+++ b/packages/vsky/libdsp/Serial.xs
@@ -0,0 +1,4 @@
+function module$use()
+{
+    xdc.useModule('xdc.runtime.Error');
+}
\ No newline at end of file
diff --git a/packages/vsky/libdsp/driver/uart.cpp b/packages/vsky/libdsp/driver/uart.cpp
index 8f1fc5a..e30a856 100644
--- a/packages/vsky/libdsp/driver/uart.cpp
+++ b/packages/vsky/libdsp/driver/uart.cpp
@@ -21,6 +21,14 @@ struct Uart : public UartImpl {
         return 0;
     }
 
+    void reset()
+    {
+        _baudrate = 115200;
+        _databits = DATA_BITS_8;
+        _stopbits = STOP_BITS_1;
+        _parity   = PARITY_NONE;
+    }
+
     void set_baudrate(int rate)
     {
         this->setBaudrate(rate);
@@ -87,6 +95,11 @@ uart_t uart_open(int bus)
     return _uart;
 }
 
+void uart_close(uart_t _uart)
+{
+    _uart->reset();
+}
+
 void uart_set_baudrate(uart_t _uart, int rate)
 {
     _uart->set_baudrate(rate);
diff --git a/packages/vsky/libdsp/inc/uart.h b/packages/vsky/libdsp/inc/uart.h
index cbc5644..dd2c52d 100644
--- a/packages/vsky/libdsp/inc/uart.h
+++ b/packages/vsky/libdsp/inc/uart.h
@@ -21,6 +21,8 @@ typedef struct Uart * uart_t;
 
 uart_t  uart_open(int uart);
 
+void uart_close(uart_t _uart);
+
 /* data in */
 int     uart_is_ready(uart_t);
 
diff --git a/packages/vsky/libdsp/package.bld b/packages/vsky/libdsp/package.bld
index f96f08d..14aecca 100644
--- a/packages/vsky/libdsp/package.bld
+++ b/packages/vsky/libdsp/package.bld
@@ -9,6 +9,7 @@ Pkg.otherFiles = [
     "GPIO.xdc",
     "Board.xdc",
     "board.xdt",
+    "Serial.xdc",
 ];
 
 var drvFiles = [
@@ -35,6 +36,7 @@ var emacFiles = [
 
 var xdcFiles = [
     "Board.c",
+    "Serial.c",
     "SerialSystem.c",
     "NorFlash.c",
     "GPIO.c",
diff --git a/packages/vsky/libdsp/package.xdc b/packages/vsky/libdsp/package.xdc
index f0aa3ee..ec89256 100644
--- a/packages/vsky/libdsp/package.xdc
+++ b/packages/vsky/libdsp/package.xdc
@@ -8,6 +8,7 @@
  */
 package vsky.libdsp [0, 9, 9, 0] {
     module Settings;
+    module Serial;
     module SerialSystem;
     module NorFlash;
     module GPIO;