scripts: add script to capture tracing data with UART backend

Add script to capture tracing stream data with UART backend. This
script is developed based on pyserial, so install it correctly
before using the script.

Signed-off-by: Wentong Wu <wentong.wu@intel.com>

CODEOWNERS

@@ -374,6 +374,7 @@
 /scripts/net/                             @jukkar @pfl
 /scripts/process_gperf.py                 @andrewboie
 /scripts/gen_relocate_app.py              @wentongwu
+/scripts/tracing/                         @wentongwu
 /scripts/sanity_chk/                      @nashif
 /scripts/sanitycheck                      @nashif
 /scripts/series-push-hook.sh              @erwango

scripts/tracing/trace_capture_uart.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+#
+# Copyright (c) 2019 Intel Corporation.
+#
+# SPDX-License-Identifier: Apache-2.0
+"""
+Script to capture tracing data with UART backend.
+"""
+
+import sys
+import serial
+import argparse
+
+def parse_args():
+    global args
+    parser = argparse.ArgumentParser(
+        description=__doc__,
+        formatter_class=argparse.RawDescriptionHelpFormatter)
+    parser.add_argument("-d", "--serial_port", required=True,
+                        help="serial port")
+    parser.add_argument("-b", "--serial_baudrate", required=True,
+                        help="serial baudrate")
+    parser.add_argument("-o", "--output", default='channel0_0',
+                        required=False, help="tracing data output file")
+    args = parser.parse_args()
+
+def main():
+    parse_args()
+    serial_port = args.serial_port
+    serial_baudrate = args.serial_baudrate
+    output_file = args.output
+    try:
+        ser = serial.Serial(serial_port, serial_baudrate)
+        ser.isOpen()
+    except serial.SerialException as e:
+        sys.exit("{}".format(e))
+
+    print("serial open success")
+
+    #enable device tracing
+    ser.write("enable\r".encode())
+
+    with open(output_file, "wb") as file_desc:
+        while True:
+            count = ser.inWaiting()
+            if count > 0:
+                while count > 0:
+                    data = ser.read()
+                    file_desc.write(data)
+                    count -= 1
+
+    ser.close()
+
+if __name__=="__main__":
+    try:
+        main()
+    except KeyboardInterrupt:
+        print('Data capture interrupted, data saved into {}'.format(args.output))
+        sys.exit(0)