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#!/usr/local/bin/python -u
""" AtomicClock.py - Access the NIST standard time service.
The script will output the current time together with a marker
indicating the source of information (NIST = genuine NIST signal,
[NIST] = NIST calibrated CPU clock, CPU = uncalibrated CPU clock).
You can call this script with a calibration float as parameter.
It will then be set as calibration for the NIST module to use.
"""
import sys
import mx.DateTime.NIST
import mx.DateTime
from time import sleep
if len(sys.argv) == 2:
try:
mx.DateTime.NIST.set_calibration(float(sys.argv[1]))
except ValueError:
pass
def run():
while 1:
if mx.DateTime.NIST.calibrating and mx.DateTime.NIST.online():
# Using the real thing
marker = 'NIST'
elif mx.DateTime.NIST.calibrated:
# Using calibrated CPU clock
marker = '[NIST]'
else:
# Using the uncalibrated CPU clock
marker = 'CPU'
# Get and show time
utc = mx.DateTime.NIST.utctime()
print ' %-6s Local: %s | UTC: %s | %+6.2fs\r' % \
(marker,mx.DateTime.utc2local(utc),utc,
mx.DateTime.NIST.calibration),
sys.stdout.flush()
sleep(1)
# Recalibrate every 10 minutes
if utc.minute % 10 == 0:
mx.DateTime.NIST.reset_auto_calibration()
if __name__ == '__main__':
try:
run()
except KeyboardInterrupt:
print
print 'Current CPU clock calibration:',mx.DateTime.NIST.calibration
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