import u3
import traceback
from datetime import datetime
import csv
import sys
import time
import math

# MAX_REQUESTS is the number of packets to be read.
MAX_REQUESTS = 1
#
## At high frequencies ( >5 kHz), the number of samples will be MAX_REQUESTS times 48 (packets per request) times 25 (samples per packet).
d = u3.U3()
#
## To learn if the U3 is an HV
d.configU3()
#
## For applying the proper calibration to readings.
d.getCalibrationData()
#
##Assigns FIO4 as Digital input timer
d.configIO(TimerCounterPinOffset=4, NumberOfTimersEnabled=1)
#
u3.Timer0Config(TimerMode=12, Value=0)
#
##6=48MHz clock base, 48= clock divisor. 48MHz/48=1MHz samples taken.
d.configTimerClock(6,48)

#u3.Timer(timer=0)

d.streamConfig(NumChannels=4, PChannels=[0, 1, 2, 200], NChannels=[31, 31, 31, 31], Resolution=1, ScanFrequency=2000)

try:
    print ("start stream",)
    d.streamStart()
    start = datetime.now()
    print (start)

    missed = 0
    dataCount = 0
    packetCount = 0


    for r in d.streamData():
        if r is not None:
            # Our stop condition
            if dataCount >= MAX_REQUESTS:
                break
                        
            if r['errors'] != 0:
                print ("Error: %s ; " % r['errors'], datetime.now())

            if r['numPackets'] != d.packetsPerRequest:
                print ("----- UNDERFLOW : %s : " % r['numPackets'], datetime.now())

            if r['missed'] != 0:
                missed += r['missed']
                print ("+++ Missed ", r['missed'])

            print(r['AIN200'])
            
        else:
            # Got no data back from our read.
            # This only happens if your stream isn't faster than the
            # the USB read timeout, ~1 sec.
            print ("No data", datetime.now())

finally:
    stop = datetime.now()
    d.streamStop()
    print ("stream stopped.")

    d.close()