Philipp

April 28, 2023

thanks for the fast response. The exact timing is not that important but it is important to configure the pulse first and be able to call another function in the sequential program when the pulse is output. Is this possible with the DIOs?

Also do you know why I don't get an Output with AutoConfigure enabled when I don't call the FDwfDigitalOutConfigure funtion?

April 28, 2023

Hello,

I'm using the python SDK to control a Digital Discovery. I want to have a constant clock output signal on one port and sometimes trigger 1/2/5 pulses on another port. With the FDwfDigitalOutRepetitionSet function this works pretty good but sometimes the initialization of the pulse leads to an interrupt in the clock signal.

I think it could be because I am using "FDwfDigitalOutConfigure" after configuring every single signal. If I set AutoConfigure on and don't use FDwfDigitalOutConfigure I don't get an output. Maybe I am doing something wrong/ forgetting something in configuring the output. This is the code I call every time to start a output signal:

Quote

#check if analog discovery is connected
            if self.hdwf.value == hdwfNone.value:
                #if not, set error code to NOK_NO_DEVICE_CONNECTED before other functions
                return self._retval_helper(self._error_codes.NOK_NO_DEVICE_CONNECTED[0])

            # get clock info clock
            hzSys = _ct.c_double()
            if not self.dwf.FDwfDigitalOutInternalClockInfo(self.hdwf, _ct.byref(hzSys)):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_GET_CLOCK_INFO[0])

            # enable DIO
            if not self.dwf.FDwfDigitalOutEnableSet(self.hdwf, data.port, 1):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_ENABLE[0])

            # prescaler to xkHz, SystemFrequency/x/2
            # frequency is doubled because for an alternating signal a minimum counter high + counter low of 2 is neccessary
            # the divider defines the frequency of one step --> 2 steps for a clock signal requires frquency*2
            # with higher counters (eg. for duty cycle) the frequency needs to be adjusted accordingly
            if not self.dwf.FDwfDigitalOutDividerSet(self.hdwf, data.port, int(hzSys.value/data.frequency/2)):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_SET_DIVIDER[0])

            # set divider init to delay signal output
            if not self.dwf.FDwfDigitalOutDividerInitSet(self.hdwf, data.port, data.divider_init):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_SET_DIVIDER_INIT[0])
            # set counter info
            if not self.dwf.FDwfDigitalOutCounterInitSet(self.hdwf, data.port, data.startHigh, data.offset_counter):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_SET_COUNTER_INIT[0])

            # 1 tick low, 1 tick high
            if not self.dwf.FDwfDigitalOutCounterSet(self.hdwf, data.port, data.counter1, data.counter2):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_SET_COUNTER_VALUES[0])

            #autoConfig = _ct.c_int()
            #self.dwf.FDwfDeviceAutoConfigureGet(self.hdwf, _ct.byref(autoConfig))
            #print(autoConfig.value)

            if not self.dwf.FDwfDigitalOutConfigure(self.hdwf, 1):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_START_INSTRUMENT[0])

            return self._retval_helper(self._error_codes.OK[0])

Attached is a photo of the signal with the interrupt

April 6, 2023

Hello,

do you any information about the long term availability/ support of the Analog Discovery Pro 3000 Series?

Best regards,

Philipp

February 22, 2023

Hi @attila

thanks for the quick response.

I didn't know about this difference between Analog and Digital Discovery but I can use a Digital Discovery for this.

Is there any documentation on how to use the Delay and Repetition function for single DIOs in python? I couldn't find anything in the SDK Reference Manual or the python examples. Maybe I was looking in the wrong document.

February 21, 2023

Thanks a lot. Now it works fine.

I have another question. Is it somehow possible to output a constant clock signal on one pin and a single pulse with a delay on another pin?

I need to setup the pulse in one function, leave it and than enter another function that processes the pulse with the delay and the continuous clock.

I tried to visualize it below. The blue squares are the separate functions, the clock can run continuously or just in the yellow marked area.

Thanks

February 14, 2023

Yes, exactly. The TriggerPC call works as intended. But no matter what I set as Run/Wait/Repeat, the pulse signal starts immediatly after the TrigerPC call and doesn't stop.

Am I forgetting some setting?

I also tried to disable the Autoconfig.

I am using a Analog Discovery 2.

February 14, 2023

Hello,

I want to use the FDwfDigitalOutWaitSet and FDwfDigitalOutRepeatSet functions but they seem to have no effect.

This is the code:

# init instance of Analog discovery as testDevice
    testDevice = AnalogDiscovery2()

    # open serial connection and print return value
    retval = testDevice.open_serial_connection()
    print("open device retval: " + retval[2])


    testDevice.dwf.FDwfDigitalOutTriggerSourceSet(testDevice.hdwf, _ct.c_ubyte(1))

    retval = testDevice.dwf.FDwfDigitalOutRunSet(testDevice.hdwf, _ct.c_float(2))
    print("set run time: ", retval)
    retval = testDevice.dwf.FDwfDigitalOutWaitSet(testDevice.hdwf, _ct.c_float(2))
    print("set wait time: ", retval)
    testDevice.dwf.FDwfDigitalOutRepeatSet(testDevice.hdwf, 1)

    # set clock signal output
    data = _ds.SET_SINGLE_CLOCK_STRUCT()
    data.frequency = 500000
    data.port = 3
    retval = testDevice.set_single_clock(data)   #function attached below
    print("set clock retval: " + retval[2])

    testDevice.dwf.FDwfDigitalOutConfigure(testDevice.hdwf, 1)

    testDevice.dwf.FDwfDeviceTriggerPC(testDevice.hdwf)

    # wait for input to pause program
    input("Press enter to stop")

    # close connection and exit program
    retval = testDevice.close_connection()
    print("close device retval: " + retval[2])
    # retval = testDevice.close_connection()
    # print(retval)

set_single_clock:

def set_single_clock(self, data: _ds.SET_SINGLE_CLOCK_STRUCT) -> (int, type(None), str):

            # configure and start clock
            hzSys = _ct.c_double()
            if not self.dwf.FDwfDigitalOutInternalClockInfo(self.hdwf, _ct.byref(hzSys)):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_GET_CLOCK_INFO[0])

            # enable DIO-0
            if not self.dwf.FDwfDigitalOutEnableSet(self.hdwf, data.port, 1):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_ENABLE[0])

            if not self.dwf.FDwfDigitalOutDividerSet(self.hdwf, data.port, int(hzSys.value/data.frequency/2)):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_SET_DIVIDER[0])

            # set counter info
            if not self.dwf.FDwfDigitalOutCounterInitSet(self.hdwf, data.port, data.startHigh, data.offset_counter):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_SET_COUNTER_INIT[0])

            # 1 tick low, 1 tick high
            if not self.dwf.FDwfDigitalOutCounterSet(self.hdwf, data.port, data.counter1, data.counter2):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_SET_COUNTER_VALUES[0])

            if not self.dwf.FDwfDigitalOutConfigure(self.hdwf, 1):
                return self._retval_helper(self._error_codes.NOK_FAILED_TO_START_INSTRUMENT[0])

            return self._retval_helper(self._error_codes.OK[0])

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Using DeviceAutoConfigure

Using DeviceAutoConfigure

Long term availablity Analog Discovery Pro 3000 Series

Waveforms SDK run pulse once after waiting for 2 seconds

Waveforms SDK run pulse once after waiting for 2 seconds

Waveforms SDK run pulse once after waiting for 2 seconds

Waveforms SDK run pulse once after waiting for 2 seconds

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