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import time
import epics
import sys
import pvnames
pvname = pvnames.updating_pv1 # motor1
write = sys.stdout.write
def wait(timeout=10):
t0 = time.time()
while time.time() - t0 < timeout:
time.sleep(1.e-4)
change_count = 0
def onChanges(pvname=None, value=None, char_value=None, **kw):
global change_count
change_count += 1
try:
write( 'PV %s %s, %s Changed!\n' % (pvname, repr(value), char_value))
except:
pass
def test_pv_callback():
mypv = epics.get_pv(pvname)
global change_count
mypv.get_ctrlvars()
mypv.add_callback(onChanges)
wait(5)
assert change_count > 5
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