def sweepSource(statusMessageQueue, ctrlNs, printQueue, ringBuf):
from SignalHound import SignalHound
logSetup.initLogging(printQ = printQueue)
loop_timer = time.time()
print "Starting sweep-logger!"
log = logging.getLogger("Main.AcqProcess")
loop_timer = time.time()
seq_num = 0
sh = SignalHound()
startAcquisition(sh, statusMessageQueue)
temperature = sh.getDeviceDiagnostics()["temperature"]
while ctrlNs.run:
bufPtr, lock = ringBuf.getAddPointer()
try:
sh.fetchRaw_s(ctDataBufPtr=bufPtr)
except Exception:
log.error("IOError in Acquisition Thread!")
log.error(traceback.format_exc())
statusMessageQueue.put({"status" : (time.time(), "Error: Device interface crashed. Reinitializing")})
log.error("Resetting hardware!")
# sh.preset()
sh.forceClose()
try:
while 1:
log.warning("Freeing python device handle")
del(sh)
except UnboundLocalError:
pass
log.error("Hardware shut down, completely re-initializing device interface!")
# sys.exit()
sh = SignalHound()
startAcquisition(sh, statusMessageQueue)
finally:
lock.release()
if seq_num % PRINT_LOOP_CNT == 0:
now = time.time()
delta = now-loop_timer
updateInterval = delta / PRINT_LOOP_CNT
freq = 1 / updateInterval
log.info("Elapsed Time = %0.5f, Frequency = %s. Items in buffer = %s", delta, freq, ringBuf.getItemsNum())
loop_timer = now
# print
if seq_num % CAL_CHK_LOOP_CNT == 0:
diags = sh.getDeviceDiagnostics()
statusMessageQueue.put({"status" : (time.time(), diags)})
temptmp = diags["temperature"]
if abs(temperature - temptmp) > 2.0: # Temperature deviations of > 2° cause IF shifts. Therefore, we do a re-cal if they're detected
statusMessageQueue.put({"status" : (time.time(), "Recalibrating IF due to temperature change")})
sh.selfCal()
startAcquisition(sh, statusMessageQueue)
log.warning("Temperature changed > 2.0 C. Delta is %f. Recalibrated!", abs(temperature - temptmp))
temperature = temptmp
else:
log.info("Temperature deviation = %f. Not doing recal, since drift < 2C", abs(temperature - temptmp))
seq_num += 1
sh.abort()
sh.closeDevice()
del(sh)
ctrlNs.acqRunning = False
log.info("Acquisition-thread exiting!")
