dev_null_auto.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 class DevNullTest():
00019 
00020     def check_readline(self, selftest, text):
00021         """ Reads line from serial port and checks if text was part of read string
00022         """
00023         result = False
00024         c = selftest.mbed.serial_readline()
00025         if c and text in c:
00026             result = True
00027         return result
00028 
00029     def test(self, selftest):
00030         result = True
00031         # Test should print some text and later stop printing
00032         # 'MBED: re-routing stdout to /null'
00033         res = self.check_readline(selftest, "re-routing stdout to /null")
00034         if not res:
00035             # We haven't read preamble line
00036             result = False
00037         else:
00038             # Check if there are printed characters
00039             str = ''
00040             for i in range(3):
00041                 c = selftest.mbed.serial_read(32)
00042                 if c is None:
00043                     return selftest.RESULT_IO_SERIAL
00044                 else:
00045                     str += c
00046                 if len(str) > 0:
00047                     result = False
00048                     break
00049             selftest.notify("Received %d bytes: %s"% (len(str), str))
00050         return selftest.RESULT_SUCCESS if result else selftest.RESULT_FAILURE