echo.py

00001 """
00002 mbed SDK
00003 Copyright (c) 2011-2013 ARM Limited
00004 
00005 Licensed under the Apache License, Version 2.0 (the "License");
00006 you may not use this file except in compliance with the License.
00007 You may obtain a copy of the License at
00008 
00009     http://www.apache.org/licenses/LICENSE-2.0
00010 
00011 Unless required by applicable law or agreed to in writing, software
00012 distributed under the License is distributed on an "AS IS" BASIS,
00013 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014 See the License for the specific language governing permissions and
00015 limitations under the License.
00016 """
00017 
00018 import sys
00019 import uuid
00020 from sys import stdout
00021 
00022 class EchoTest():
00023 
00024     # Test parameters
00025     TEST_SERIAL_BAUDRATE = 115200
00026     TEST_LOOP_COUNT = 50
00027 
00028     def test(self, selftest):
00029         """ This host test will use mbed serial port with
00030             baudrate 115200 to perform echo test on that port.
00031         """
00032         # Custom initialization for echo test
00033         selftest.mbed.init_serial_params(serial_baud=self.TEST_SERIAL_BAUDRATE)
00034         selftest.mbed.init_serial()
00035 
00036         # Test function, return True or False to get standard test notification on stdout
00037         selftest.mbed.flush()
00038         selftest.notify("HOST: Starting the ECHO test")
00039         result = True
00040         
00041         """ This ensures that there are no parasites left in the serial buffer.
00042         """
00043         for i in range(0, 2):
00044             selftest.mbed.serial_write("\n")
00045             c = selftest.mbed.serial_readline()
00046             
00047         for i in range(0, self.TEST_LOOP_COUNT):
00048             TEST_STRING = str(uuid.uuid4()) + "\n"
00049             selftest.mbed.serial_write(TEST_STRING)
00050             c = selftest.mbed.serial_readline()
00051             if c is None:
00052                 return selftest.RESULT_IO_SERIAL
00053             if c.strip() != TEST_STRING.strip():
00054                 selftest.notify('HOST: "%s" != "%s"'% (c, TEST_STRING))
00055                 result = False
00056             else:
00057                 sys.stdout.write('.')
00058                 stdout.flush()
00059         return selftest.RESULT_SUCCESS if result else selftest.RESULT_FAILURE