pulse generator

[guis06]

Hello,

To explain my wish :)

I am using Analog Discovery 2. 

I would like to create a pulse of 1ms for example on DIO_1 when i counted 2000 pulse in DIO_0

I tryed o use DigitalIn_Sync.py and DigitalOut_Pulse ....to mix them and ...i failed. 

Do you have idea how i can do it better?

 

my code : 

 

# set number of sample to acquire

nSamples =  5000

rgwSamples = (c_uint16*nSamples)()

cAvailable = c_int()

cLost = c_int()

cCorrupted = c_int()

cSamples = 0

fLost = 0

fCorrupted = 0

 

# record mode

dwf.FDwfDigitalInAcquisitionModeSet(hdwf, acqmodeRecord)

# for sync mode set divider to -1 

dwf.FDwfDigitalInDividerSet(hdwf, c_int(-1))

# 1bit per sample format

dwf.FDwfDigitalInSampleFormatSet(hdwf, c_int(1))

# number of samples 

dwf.FDwfDigitalInTriggerPositionSet(hdwf, c_int(nSamples))

# in sync mode the trigger is used for sampling condition

# trigger detector mask:          low &     hight & ( rising | falling )

dwf.FDwfDigitalInTriggerSet(hdwf, c_int(0), c_int(0), c_int(1<<0), c_int(0)) # DIO-0 rising edge

 

# begin acquisition

dwf.FDwfDigitalInConfigure(hdwf, c_bool(0), c_bool(1))

 

print("Starting sync record...")

 

while cSamples < nSamples:

    dwf.FDwfDigitalInStatus(hdwf, c_int(1), byref(sts))

    if cSamples == 0 and (sts == DwfStateConfig or sts == DwfStatePrefill or sts == DwfStateArmed) :

        # acquisition not yet started.

        continue

    dwf.FDwfDigitalInStatusRecord(hdwf, byref(cAvailable), byref(cLost), byref(cCorrupted))

    cSamples += cLost.value

        if cLost.value :

        fLost = 1

    if cCorrupted.value :

        fCorrupted = 1

    if cAvailable.value==0 :

       continue

    if cSamples+cAvailable.value > nSamples :

        cAvailable = c_int(nSamples-cSamples)

    

    # get samples

    dwf.FDwfDigitalInStatusData(hdwf, byref(rgwSamples, 2*cSamples), c_int(2*cAvailable.value))

    cSamples += cAvailable.value    

 

dwf.FDwfDigitalOutRunSet(hdwf, c_double(0.001)) # 1ms run

dwf.FDwfDigitalOutRepeatSet(hdwf, c_int(1)) # once

dwf.FDwfDigitalOutIdleSet(hdwf, c_int(4), c_int(1)) # 1=DwfDigitalOutIdleLow, low when not running 

dwf.FDwfDigitalOutCounterInitSet(hdwf, c_int(4), c_int(1), c_int(0)) # initialize high on start

dwf.FDwfDigitalOutCounterSet(hdwf, c_int(4), c_int(0), c_int(0)) # low/high count zero, no toggle during run

dwf.FDwfDigitalOutEnableSet(hdwf, c_int(4), c_int(1))

 

print("Generating 1ms pulse")

dwf.FDwfDigitalOutConfigure(hdwf, c_int(1))

 

print("   done")

if fLost:

    print("Samples were lost! Reduce sample rate")

if cCorrupted:

    print("Samples could be corrupted! Reduce sample rate")

 

f = open("record.csv", "w")

for v in rgwSamples:

    f.write("%s\n" % v)

f.close()

 

dwf.FDwfDeviceClose(hdwf)

 

 

 

[attila]

Hi @guis06

See the following example:

from ctypes import *
import sys

if sys.platform.startswith("win"):
    dwf = cdll.dwf
elif sys.platform.startswith("darwin"):
    dwf = cdll.LoadLibrary("/Library/Frameworks/dwf.framework/dwf")
else:
    dwf = cdll.LoadLibrary("libdwf.so")

version = create_string_buffer(16)
dwf.FDwfGetVersion(version)
print("DWF Version: "+str(version.value))

# continue running after device close
dwf.FDwfParamSet(c_int(4), c_int(0)) # DwfParamOnClose 0 = run, 1 = stop, 2 = shutdown

print("Opening first device")
hdwf = c_int()
dwf.FDwfDeviceOpen(c_int(-1), byref(hdwf))

if hdwf.value == 0:
    print("failed to open device")
    szerr = create_string_buffer(512)
    dwf.FDwfGetLastErrorMsg(szerr)
    print(str(szerr.value))
    quit()

# the device will be configured only when calling FDwf###Configure
dwf.FDwfDeviceAutoConfigureSet(hdwf, c_int(0))

# digital output
dwf.FDwfDigitalOutTriggerSourceSet(hdwf, c_int(3)) # trigsrcDetectorDigitalIn
dwf.FDwfDigitalOutRepeatSet(hdwf, c_int(0)) # infinite repeat
dwf.FDwfDigitalOutRepeatTriggerSet(hdwf, c_int(1))  # wait for trigger in each cycle
dwf.FDwfDigitalOutRunSet(hdwf, c_double(0.001)) # 1ms run
# DIO 1 pulse
dwf.FDwfDigitalOutEnableSet(hdwf, c_int(1), c_int(1))
dwf.FDwfDigitalOutIdleSet(hdwf, c_int(1), c_int(1)) # 1=DwfDigitalOutIdleLow, low when not running 
dwf.FDwfDigitalOutCounterInitSet(hdwf, c_int(1), c_int(1), c_int(0)) # initialize with high when running
dwf.FDwfDigitalOutCounterSet(hdwf, c_int(1), c_int(0), c_int(0)) # low/high count zero, no toggle during run
# configure and start 
dwf.FDwfDigitalOutConfigure(hdwf, c_int(1))

# digital input trigger
dwf.FDwfDigitalInTriggerSet(hdwf, c_int(0), c_int(1<<0), c_int(0), c_int(0)) # DIO 0 rising edge
dwf.FDwfDigitalInTriggerLengthSet(hdwf, c_double(1e-7), c_double(-1), c_int(0)) # 100ns glitch filter
dwf.FDwfDigitalInTriggerCountSet(hdwf, c_int(20000), c_int(1)) # count 20k and restart
dwf.FDwfDigitalInConfigure(hdwf, c_bool(1), c_bool(1))


dwf.FDwfDeviceCloseAll()

 

[guis06]

Hello Attila.

A big thnaks... you are the best.

Everything  works well