Added us Timer host test automation

workspace_tools/host_tests/wait_us_auto.py

@@ -0,0 +1,55 @@
+"""
+mbed SDK
+Copyright (c) 2011-2013 ARM Limited
+
+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.
+"""
+
+from host_test import Test, DefaultTest
+from time import time
+from sys import stdout
+
+class WaitusTest(DefaultTest):
+    def print_result(self, result):
+       print "\n{%s}\n{end}" % result
+
+    def run(self):
+        test_result = True
+        # First character to start test (to know after reset when test starts)
+        self.mbed.serial.timeout = None
+        c = self.mbed.serial.read(1)
+        print "Test started"
+        start_serial_pool = start = time();
+        for i in range(0, 10):
+            c = self.mbed.serial.read(1)
+            if i > 2: # we will ignore first few measurements
+                delta = time() - start
+                deviation = abs(delta - 1) 
+                deviation_ok = True if delta > 0 and deviation <= 0.5 else False # +/-5%
+                test_result = test_result and deviation_ok
+                msg = "OK" if deviation_ok else "FAIL"
+                print ". in %.2f sec (%.2f) [%s]" % (delta, abs(delta - 0.95), msg)
+            else:
+                print "."
+            start = time();
+        measurement_time = time() - start_serial_pool
+        print "Completed in %.2f sec" % (measurement_time)
+        
+        if test_result: # All numbers are the same
+            self.print_result('success')
+        else:
+            self.print_result('failure')
+        stdout.flush()
+
+if __name__ == '__main__':
+    WaitusTest().run()