Import Mbed OS hard-float snapshot

tools/host_tests/dev_null_auto.py

@@ -0,0 +1,51 @@
+"""
+mbed SDK
+Copyright (c) 2011-2013 ARM Limited
+SPDX-License-Identifier: Apache-2.0
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+"""
+
+class DevNullTest(object):
+
+    def check_readline(self, selftest, text):
+        """ Reads line from serial port and checks if text was part of read string
+        """
+        result = False
+        c = selftest.mbed.serial_readline()
+        if c and text in c:
+            result = True
+        return result
+
+    def test(self, selftest):
+        result = True
+        # Test should print some text and later stop printing
+        # 'MBED: re-routing stdout to /null'
+        res = self.check_readline(selftest, "re-routing stdout to /null")
+        if not res:
+            # We haven't read preamble line
+            result = False
+        else:
+            # Check if there are printed characters
+            str = ''
+            for i in range(3):
+                c = selftest.mbed.serial_read(32)
+                if c is None:
+                    return selftest.RESULT_IO_SERIAL
+                else:
+                    str += c
+                if len(str) > 0:
+                    result = False
+                    break
+            selftest.notify("Received %d bytes: %s"% (len(str), str))
+        return selftest.RESULT_SUCCESS if result else selftest.RESULT_FAILURE