70 lines
2.8 KiB
Python
70 lines
2.8 KiB
Python
|
"""
|
||
|
|
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 time import time
|
||
|
|
|
||
|
|
class WaitusTest():
|
||
|
|
""" This test is reading single characters from stdio
|
||
|
|
and measures time between their occurrences.
|
||
|
|
"""
|
||
|
|
TICK_LOOP_COUNTER = 13
|
||
|
|
TICK_LOOP_SUCCESSFUL_COUNTS = 10
|
||
|
|
DEVIATION = 0.10 # +/-10%
|
||
|
|
|
||
|
|
def test(self, selftest):
|
||
|
|
test_result = True
|
||
|
|
# First character to start test (to know after reset when test starts)
|
||
|
|
if selftest.mbed.set_serial_timeout(None) is None:
|
||
|
|
return selftest.RESULT_IO_SERIAL
|
||
|
|
c = selftest.mbed.serial_read(1)
|
||
|
|
if c is None:
|
||
|
|
return selftest.RESULT_IO_SERIAL
|
||
|
|
if c == '$': # target will printout TargetID e.g.: $$$$1040e649d5c09a09a3f6bc568adef61375c6
|
||
|
|
#Read additional 39 bytes of TargetID
|
||
|
|
if selftest.mbed.serial_read(39) is None:
|
||
|
|
return selftest.RESULT_IO_SERIAL
|
||
|
|
c = selftest.mbed.serial_read(1) # Re-read first 'tick'
|
||
|
|
if c is None:
|
||
|
|
return selftest.RESULT_IO_SERIAL
|
||
|
|
start_serial_pool = time()
|
||
|
|
start = time()
|
||
|
|
|
||
|
|
success_counter = 0
|
||
|
|
|
||
|
|
for i in range(0, self.TICK_LOOP_COUNTER):
|
||
|
|
c = selftest.mbed.serial_read(1)
|
||
|
|
if c is None:
|
||
|
|
return selftest.RESULT_IO_SERIAL
|
||
|
|
delta = time() - start
|
||
|
|
deviation = abs(delta - 1)
|
||
|
|
# Round values
|
||
|
|
delta = round(delta, 2)
|
||
|
|
deviation = round(deviation, 2)
|
||
|
|
# Check if time measurements are in given range
|
||
|
|
deviation_ok = True if delta > 0 and deviation <= self.DEVIATION else False
|
||
|
|
success_counter = success_counter+1 if deviation_ok else 0
|
||
|
|
msg = "OK" if deviation_ok else "FAIL"
|
||
|
|
selftest.notify("%s in %.2f sec (%.2f) [%s]"% (c, delta, deviation, msg))
|
||
|
|
start = time()
|
||
|
|
if success_counter >= self.TICK_LOOP_SUCCESSFUL_COUNTS:
|
||
|
|
break
|
||
|
|
measurement_time = time() - start_serial_pool
|
||
|
|
selftest.notify("Consecutive OK timer reads: %d"% success_counter)
|
||
|
|
selftest.notify("Completed in %.2f sec" % (measurement_time))
|
||
|
|
test_result = True if success_counter >= self.TICK_LOOP_SUCCESSFUL_COUNTS else False
|
||
|
|
return selftest.RESULT_SUCCESS if test_result else selftest.RESULT_FAILURE
|