def naberDataA():
# Create chandle and status ready for use
chandle = ctypes.c_int16()
status = {}
# Open 2000 series PicoScope
# Returns handle to chandle for use in future API functions
status["openunit"] = ps.ps2000aOpenUnit(ctypes.byref(chandle), None)
assert_pico_ok(status["openunit"])
# Set up channel A
# handle = chandle
# channel = PS2000A_CHANNEL_A = 0
# enabled = 1
# coupling type = PS2000A_DC = 1
# range = PS2000A_2V = 7
# analogue offset = 0 V
chARange = 5
status["setChA"] = ps.ps2000aSetChannel(chandle, 0, 1, 0, chARange, 0)
assert_pico_ok(status["setChA"])
# Set up channel B
# handle = chandle
# channel = PS2000A_CHANNEL_B = 1
# enabled = 1
# coupling type = PS2000A_DC = 1
# range = PS2000A_2V = 7
# analogue offset = 0 V
chBRange = 7
status["setChB"] = ps.ps2000aSetChannel(chandle, 1, 1, 1, chBRange, 0)
assert_pico_ok(status["setChB"])
# Set up single trigger
# handle = chandle
# enabled = 1
# source = PS2000A_CHANNEL_A = 0
# threshold = 1024 ADC counts
# direction = PS2000A_RISING = 2 (falling = 3)
# delay = 0 s
# auto Trigger = 1000 ms
maxADC = ctypes.c_int16()
status["maximumValue"] = ps.ps2000aMaximumValue(chandle,
ctypes.byref(maxADC))
vRange = 500
mvTrigger = -100
adcTrigger = int(mvTrigger / vRange * maxADC.value)
# print(maxADC.value,adcTrigger)
status["trigger"] = ps.ps2000aSetSimpleTrigger(chandle, 1, 0, adcTrigger,
3, 0, 0)
assert_pico_ok(status["trigger"])
# Set number of pre and post trigger samples to be collected
#preTriggerSamples = 2500
#postTriggerSamples = 2500
preTriggerSamples = 300
postTriggerSamples = 2150
totalSamples = preTriggerSamples + postTriggerSamples
# Get timebase information
# handle = chandle
# timebase = 8 = timebase
# noSamples = totalSamples
# pointer to timeIntervalNanoseconds = ctypes.byref(timeIntervalNs)
# pointer to totalSamples = ctypes.byref(returnedMaxSamples)
# segment index = 0
timebase = 8
timeIntervalns = ctypes.c_float()
returnedMaxSamples = ctypes.c_int32()
oversample = ctypes.c_int16(0)
status["getTimebase2"] = ps.ps2000aGetTimebase2(
chandle, timebase, totalSamples, ctypes.byref(timeIntervalns),
oversample, ctypes.byref(returnedMaxSamples), 0)
assert_pico_ok(status["getTimebase2"])
# Run block capture
# handle = chandle
# number of pre-trigger samples = preTriggerSamples
# number of post-trigger samples = PostTriggerSamples
# timebase = 8 = 80 ns = timebase (see Programmer's guide for mre information on timebases)
# oversample = 0 = oversample
# time indisposed ms = None (not needed in the example)
# segment index = 0
# lpReady = None (using ps2000aIsReady rather than ps2000aBlockReady)
# pParameter = None
status["runBlock"] = ps.ps2000aRunBlock(chandle, preTriggerSamples,
postTriggerSamples, timebase,
oversample, None, 0, None, None)
assert_pico_ok(status["runBlock"])
# Check for data collection to finish using ps2000aIsReady
ready = ctypes.c_int16(0)
check = ctypes.c_int16(0)
while ready.value == check.value:
status["isReady"] = ps.ps2000aIsReady(chandle, ctypes.byref(ready))
# Create buffers ready for assigning pointers for data collection
bufferAMax = (ctypes.c_int16 * totalSamples)()
bufferAMin = (ctypes.c_int16 * totalSamples)(
) # used for downsampling which isn't in the scope of this example
bufferBMax = (ctypes.c_int16 * totalSamples)()
bufferBMin = (ctypes.c_int16 * totalSamples)(
) # used for downsampling which isn't in the scope of this example
# Set data buffer location for data collection from channel A
# handle = chandle
# source = PS2000A_CHANNEL_A = 0
# pointer to buffer max = ctypes.byref(bufferDPort0Max)
# pointer to buffer min = ctypes.byref(bufferDPort0Min)
# buffer length = totalSamples
# segment index = 0
# ratio mode = PS2000A_RATIO_MODE_NONE = 0
status["setDataBuffersA"] = ps.ps2000aSetDataBuffers(
chandle, 0, ctypes.byref(bufferAMax), ctypes.byref(bufferAMin),
totalSamples, 0, 0)
assert_pico_ok(status["setDataBuffersA"])
# Set data buffer location for data collection from channel B
# handle = chandle
# source = PS2000A_CHANNEL_B = 1
# pointer to buffer max = ctypes.byref(bufferBMax)
# pointer to buffer min = ctypes.byref(bufferBMin)
# buffer length = totalSamples
# segment index = 0
# ratio mode = PS2000A_RATIO_MODE_NONE = 0
status["setDataBuffersB"] = ps.ps2000aSetDataBuffers(
chandle, 1, ctypes.byref(bufferBMax), ctypes.byref(bufferBMin),
totalSamples, 0, 0)
assert_pico_ok(status["setDataBuffersB"])
# Create overflow location
overflow = ctypes.c_int16()
# create converted type totalSamples
cTotalSamples = ctypes.c_int32(totalSamples)
# Retried data from scope to buffers assigned above
# handle = chandle
# start index = 0
# pointer to number of samples = ctypes.byref(cTotalSamples)
# downsample ratio = 0
# downsample ratio mode = PS2000A_RATIO_MODE_NONE
# pointer to overflow = ctypes.byref(overflow))
status["getValues"] = ps.ps2000aGetValues(chandle, 0,
ctypes.byref(cTotalSamples), 0,
0, 0, ctypes.byref(overflow))
assert_pico_ok(status["getValues"])
# find maximum ADC count value
# handle = chandle
# pointer to value = ctypes.byref(maxADC)
maxADC = ctypes.c_int16()
# print(maxADC.value)
status["maximumValue"] = ps.ps2000aMaximumValue(chandle,
ctypes.byref(maxADC))
assert_pico_ok(status["maximumValue"])
# print(maxADC)
# convert ADC counts data to mV
adc2mVChAMax = adc2mV(bufferAMax, chARange, maxADC)
adc2mVChBMax = adc2mV(bufferBMax, chBRange, maxADC)
# Create time data
time = np.linspace(0, (cTotalSamples.value) * timeIntervalns.value,
cTotalSamples.value)
# Stop the scope
# handle = chandle
status["stop"] = ps.ps2000aStop(chandle)
assert_pico_ok(status["stop"])
# Close unitDisconnect the scope
# handle = chandle
status["close"] = ps.ps2000aCloseUnit(chandle)
assert_pico_ok(status["close"])
# display status returns
# print(status)
casA = np.array(time)
napetiA = np.array(adc2mVChAMax)
return casA, napetiA
chandle, timebase, totalSamples, ctypes.byref(timeIntervalns), oversample,
ctypes.byref(returnedMaxSamples), 0)
assert_pico_ok(status["getTimebase2"])
# Run block capture
# handle = chandle
# number of pre-trigger samples = preTriggerSamples
# number of post-trigger samples = PostTriggerSamples
# timebase = 8 = 80 ns = timebase (see Programmer's guide for mre information on timebases)
# oversample = 0 = oversample
# time indisposed ms = None (not needed in the example)
# segment index = 0
# lpReady = None (using ps2000aIsReady rather than ps2000aBlockReady)
# pParameter = None
status["runBlock"] = ps.ps2000aRunBlock(chandle, preTriggerSamples,
postTriggerSamples, timebase,
oversample, None, 0, None, None)
assert_pico_ok(status["runBlock"])
# Check for data collection to finish using ps2000aIsReady
ready = ctypes.c_int16(0)
check = ctypes.c_int16(0)
while ready.value == check.value:
status["isReady"] = ps.ps2000aIsReady(chandle, ctypes.byref(ready))
# Create buffers ready for assigning pointers for data collection
bufferAMax = (ctypes.c_int16 * totalSamples)()
bufferAMin = (ctypes.c_int16 * totalSamples)(
) # used for downsampling which isn't in the scope of this example
bufferCMax = (ctypes.c_int16 * totalSamples)()
bufferCMin = (ctypes.c_int16 * totalSamples)(
overflow = (ctypes.c_int16 * 2)()
# Start the block capture
# for i in range(1):
while (1):
# The event time is referred to local PC time
filename = datetime.now().strftime('%H-%M-%S')
# preTriggerSamples, postTriggerSamples, timebase and segementIndex are set above.
# oversample = 1 not used value.
# time indisposed ms = None (This is not needed within the example)
# LpRead = None # Callback function
# pParameter = None # Callback parameter
status["runblock"] = ps.ps2000aRunBlock(handle, preTriggerSamples,
postTriggerSamples, timebase, 1,
None, segmentIndex, None, None)
assert_pico_ok(status["runblock"])
# We are not going to use a callback (not implemented in python) but polling:
# This is, check constantly is the data collection is finished to finish the capture
ready = ctypes.c_int16(0)
while ready.value == 0:
status["isReady"] = ps.ps2000aIsReady(handle, ctypes.byref(ready))
# When finished, we are going to collect our data in the buffers
startIndex = 0 # Where you start taking samples
# noOfSamples = ctypes.byref(csamples)
# DownSampleRatio = 0
# DownSampleRatioMode = 0
# SegmentIndex = 0