erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

tools/host_tests/wait_us_auto.py@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 """
elessair 0:f269e3021894 2 mbed SDK
elessair 0:f269e3021894 3 Copyright (c) 2011-2013 ARM Limited
elessair 0:f269e3021894 4
elessair 0:f269e3021894 5 Licensed under the Apache License, Version 2.0 (the "License");
elessair 0:f269e3021894 6 you may not use this file except in compliance with the License.
elessair 0:f269e3021894 7 You may obtain a copy of the License at
elessair 0:f269e3021894 8
elessair 0:f269e3021894 9 http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 10
elessair 0:f269e3021894 11 Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 12 distributed under the License is distributed on an "AS IS" BASIS,
elessair 0:f269e3021894 13 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 14 See the License for the specific language governing permissions and
elessair 0:f269e3021894 15 limitations under the License.
elessair 0:f269e3021894 16 """
elessair 0:f269e3021894 17
elessair 0:f269e3021894 18 from time import time
elessair 0:f269e3021894 19
elessair 0:f269e3021894 20 class WaitusTest():
elessair 0:f269e3021894 21 """ This test is reading single characters from stdio
elessair 0:f269e3021894 22 and measures time between their occurrences.
elessair 0:f269e3021894 23 """
elessair 0:f269e3021894 24 TICK_LOOP_COUNTER = 13
elessair 0:f269e3021894 25 TICK_LOOP_SUCCESSFUL_COUNTS = 10
elessair 0:f269e3021894 26 DEVIATION = 0.10 # +/-10%
elessair 0:f269e3021894 27
elessair 0:f269e3021894 28 def test(self, selftest):
elessair 0:f269e3021894 29 test_result = True
elessair 0:f269e3021894 30 # First character to start test (to know after reset when test starts)
elessair 0:f269e3021894 31 if selftest.mbed.set_serial_timeout(None) is None:
elessair 0:f269e3021894 32 return selftest.RESULT_IO_SERIAL
elessair 0:f269e3021894 33 c = selftest.mbed.serial_read(1)
elessair 0:f269e3021894 34 if c is None:
elessair 0:f269e3021894 35 return selftest.RESULT_IO_SERIAL
elessair 0:f269e3021894 36 if c == '$': # target will printout TargetID e.g.: $$$$1040e649d5c09a09a3f6bc568adef61375c6
elessair 0:f269e3021894 37 #Read additional 39 bytes of TargetID
elessair 0:f269e3021894 38 if selftest.mbed.serial_read(39) is None:
elessair 0:f269e3021894 39 return selftest.RESULT_IO_SERIAL
elessair 0:f269e3021894 40 c = selftest.mbed.serial_read(1) # Re-read first 'tick'
elessair 0:f269e3021894 41 if c is None:
elessair 0:f269e3021894 42 return selftest.RESULT_IO_SERIAL
elessair 0:f269e3021894 43 start_serial_pool = time()
elessair 0:f269e3021894 44 start = time()
elessair 0:f269e3021894 45
elessair 0:f269e3021894 46 success_counter = 0
elessair 0:f269e3021894 47
elessair 0:f269e3021894 48 for i in range(0, self.TICK_LOOP_COUNTER):
elessair 0:f269e3021894 49 c = selftest.mbed.serial_read(1)
elessair 0:f269e3021894 50 if c is None:
elessair 0:f269e3021894 51 return selftest.RESULT_IO_SERIAL
elessair 0:f269e3021894 52 delta = time() - start
elessair 0:f269e3021894 53 deviation = abs(delta - 1)
elessair 0:f269e3021894 54 # Round values
elessair 0:f269e3021894 55 delta = round(delta, 2)
elessair 0:f269e3021894 56 deviation = round(deviation, 2)
elessair 0:f269e3021894 57 # Check if time measurements are in given range
elessair 0:f269e3021894 58 deviation_ok = True if delta > 0 and deviation <= self.DEVIATION else False
elessair 0:f269e3021894 59 success_counter = success_counter+1 if deviation_ok else 0
elessair 0:f269e3021894 60 msg = "OK" if deviation_ok else "FAIL"
elessair 0:f269e3021894 61 selftest.notify("%s in %.2f sec (%.2f) [%s]"% (c, delta, deviation, msg))
elessair 0:f269e3021894 62 start = time()
elessair 0:f269e3021894 63 if success_counter >= self.TICK_LOOP_SUCCESSFUL_COUNTS:
elessair 0:f269e3021894 64 break
elessair 0:f269e3021894 65 measurement_time = time() - start_serial_pool
elessair 0:f269e3021894 66 selftest.notify("Consecutive OK timer reads: %d"% success_counter)
elessair 0:f269e3021894 67 selftest.notify("Completed in %.2f sec" % (measurement_time))
elessair 0:f269e3021894 68 test_result = True if success_counter >= self.TICK_LOOP_SUCCESSFUL_COUNTS else False
elessair 0:f269e3021894 69 return selftest.RESULT_SUCCESS if test_result else selftest.RESULT_FAILURE