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import time
import sys
from epics import ca
import pvnames
pvname = pvnames.updating_pv1
def wait(step=0.1, maxtime=30):
t0 = time.time()
while time.time()-t0 < maxtime:
time.sleep(step)
def setup_callback(pvname):
def my_cb(pvname=None, value=None, **kw):
sys.stdout.write( 'get: %s value=%s, kw=%s\n' %( pvname, str(value), repr(kw)))
sys.stdout.flush()
chid = ca.create_channel(pvname)
return ca.create_subscription(chid, callback=my_cb)
cb_ref = setup_callback(pvname)
wait()
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