def AnalogOutIn():
version = dwf.GetVersion()
print "Version: " + version
cdevices = dwf.Enum(0)
print "Number of Devices: " + str(cdevices)
print "Opening first device"
hdev = dwf.DeviceOpen(0)
print "Configure and start first analog out channel"
dwf.AnalogOutEnableSet(hdev, 0, 1)
print "1 = Sine wave"
dwf.AnalogOutFunctionSet(hdev, 0, 1)
dwf.AnalogOutFrequencySet(hdev, 0, 3000)
print ""
dwf.AnalogOutConfigure(hdev, 0, 1)
print "Configure analog in"
dwf.AnalogInFrequencySet(hdev, 1000000)
print "Set range for all channels"
dwf.AnalogInChannelRangeSet(hdev, -1, 4)
anInBufSize = 4000
dwf.AnalogInBufferSizeSet(hdev, anInBufSize)
print "Wait after first device opening the analog in offset to stabilize"
time.sleep(2)
print "Starting acquisition"
dwf.AnalogInConfigure(hdev, 1, 1)
print " waiting to finish"
while True:
sts = dwf.AnalogInStatus(hdev, 1)
if sts == dwf.DwfStateDone:
break
time.sleep(0.1)
print " done"
print " reading data"
rg = np.zeros(anInBufSize, dtype=np.double)
dwf.AnalogInStatusData(hdev, 0, rg)
dwf.DeviceCloseAll()
dc = np.mean(rg)
print "DC: " + str(dc) + "V"
plt.plot(rg)
plt.show()
def AnalogIn_Acquisition():
#print DWF version
version = dwf.GetVersion()
print "DWF Version: %s" % (version)
#open device
print "Opening first device"
hdwf = dwf.DeviceOpen(-1)
if hdwf == dwf.hdwfNone:
print "failed to open device"
else:
print "Preparing to read sample..."
#set up acquisition
dwf.AnalogInFrequencySet(hdwf, 20000000.0)
dwf.AnalogInBufferSizeSet(hdwf, 4000)
dwf.AnalogInChannelEnableSet(hdwf, 0, True)
dwf.AnalogInChannelRangeSet(hdwf, 0, 5)
#wait at least 2 seconds for the offset to stabilize
time.sleep(2)
#begin acquisition
dwf.AnalogInConfigure(hdwf, False, True)
print " waiting to finish"
while True:
sts = dwf.AnalogInStatus(hdwf, 1)
print "STS VAL: %s STS DONE: %s" %( sts, dwf.DwfStateDone)
if sts == dwf.DwfStateDone :
break
time.sleep(0.1)
print "Acquisition finished"
rgdSamples = np.zeros(4000, dtype=np.double)
dwf.AnalogInStatusData(hdwf, 0, rgdSamples)
dwf.DeviceCloseAll()
#plot window
dc = np.mean(rgdSamples)
print "DC: %f V" % (dc)
plt.plot(rgdSamples)
plt.show()
def AnalogIn_Trigger(hdwf):
rgdSamples = np.zeros(4000, dtype=np.double)
#set up acquisition
dwf.AnalogInFrequencySet(hdwf, 20000000.0)
dwf.AnalogInBufferSizeSet(hdwf, 8192)
dwf.AnalogInChannelEnableSet(hdwf, 0, True)
dwf.AnalogInChannelRangeSet(hdwf, 0, 5)
#set up trigger
dwf.AnalogInTriggerAutoTimeoutSet(hdwf, 0) #disable auto trigger
dwf.AnalogInTriggerSourceSet(
hdwf, dwf.trigsrcDetectorAnalogIn) #one of the analog in channels
dwf.AnalogInTriggerTypeSet(hdwf, dwf.trigtypeEdge)
dwf.AnalogInTriggerChannelSet(hdwf, 0) # first channel
dwf.AnalogInTriggerLevelSet(hdwf, 1.5) # 1.5V
dwf.AnalogInTriggerConditionSet(hdwf, dwf.trigcondRisingPositive)
#wait at least 2 seconds for the offset to stabilize
time.sleep(2)
print " starting repeated acquisitons"
for iTrigger in range(1, 100):
#begin acquisition
dwf.AnalogInConfigure(hdwf, False, True)
while True:
sts = dwf.AnalogInStatus(hdwf, 1)
if sts == dwf.DwfStateDone:
break
time.sleep(0.001)
dwf.AnalogInStatusData(hdwf, 0, rgdSamples)
dc = np.mean(rgdSamples)
print "Acquisition #%3d average: %g V" % (iTrigger, dc)
dwf.DeviceCloseAll()
def AcquireAnalog(fd, cnt, fSample=2E6, chNr=0):
'''
Aquire analog input data:
fd Descriptor for the file
cnt Sample count to aquire
fSample Sample frequency in [Hz]
chNr Input channel 0..1
'''
data = None
if 0 <= chNr < 2:
data = np.zeros(cnt, dtype=np.double)
dwf.AnalogInFrequencySet(fd, fSample)
dwf.AnalogInBufferSizeSet(fd, cnt)
dwf.AnalogInChannelEnableSet(fd, chNr, True)
dwf.AnalogInChannelRangeSet(fd, chNr, 5)
time.sleep(2)
dwf.AnalogInConfigure(fd, False, True)
sts = dwf.stsCfg
while not sts == dwf.stsDone:
sts = dwf.AnalogInStatus(fd, True)
print("Current analog status: %d" % sts)
dwf.AnalogInStatusData(fd, chNr, data)
return data
def AnalogIn_Sample():
#print DWF version
version = dwf.GetVersion()
print "DWF Version: %s" % (version)
#open device
"Opening first device..."
hdwf = dwf.DeviceOpen(-1)
if hdwf == dwf.hdwfNone:
print "failed to open device"
else:
print "Preparing to read sample..."
dwf.AnalogInChannelEnableSet(hdwf, 0, True)
dwf.AnalogInChannelOffsetSet(hdwf, 0, 0)
dwf.AnalogInChannelRangeSet(hdwf, 0, 5)
dwf.AnalogInConfigure(hdwf, False, False)
time.sleep(2)
sts = dwf.AnalogInStatus(hdwf, False)
voltage = dwf.AnalogInStatusSample(hdwf, 0)
print "Voltage: %f V" % (voltage)
dwf.DeviceCloseAll()