DigiDisco: FDwfDigitalOutModeSet not available, nor documented

[HoWei]

In the SDK manual (4th April 2019) on page 83 the command "FDwfDigitalOutModeSet" is mentioned.

I did not find any documentation of this command in the docu, nor did I find any example using this command.

I want to set the DIO output mode to "PP" - like I can do it within the Waveforms application.

 

Can you please provide information how to do it - perferrably in python ?

 

[HoWei]

Seems like the correct command is

#Set output mode to push pull
dwf.FDwfDigitalOutOutputSet(hdwf, c_int(4), DwfDigitalOutOutputPushPull)

I found it by luck in one of the forum discussions.

[attila]

Hi @HoWei

The WF application uses a kind of 'pulse' configuration to generate clock, like it is in the DigitalOut_Duty.py example

See the SDK/ samples/ py/ DigitalOut_Duty.py Phase.py Pins.py Pulse.py

iChannel = 0
hzFreq = 1000 # PWM freq Hz
prcDuty = 1.23 # duty %

hzSys = c_double()
maxCnt = c_uint()
dwf.FDwfDigitalOutInternalClockInfo(hdwf, byref(hzSys))
dwf.FDwfDigitalOutCounterInfo(hdwf, c_int(0), 0, byref(maxCnt))

# for low frequencies use divider as pre-scaler to satisfy counter limitation of 32k
cDiv = int(math.ceil(hzSys.value/hzFreq/maxCnt.value))
# count steps to generate the given frequency
cPulse = int(round(hzSys.value/hzFreq/cDiv))
# duty
cHigh = int(cPulse*prcDuty/100)
cLow = int(cPulse-cHigh)

print("Generate: "+str(hzSys.value/cPulse/cDiv)+"Hz duty: "+str(100.0*cHigh/cPulse)+"% divider: "+str(cDiv))

dwf.FDwfDigitalOutEnableSet(hdwf, c_int(iChannel), c_int(1))
dwf.FDwfDigitalOutTypeSet(hdwf, c_int(iChannel), c_int(0)) # DwfDigitalOutTypePulse
dwf.FDwfDigitalOutDividerSet(hdwf, c_int(iChannel), c_int(cDiv)) # max 2147483649, for counter limitation or custom sample rate
dwf.FDwfDigitalOutCounterSet(hdwf, c_int(iChannel), c_int(cLow), c_int(cHigh)) # max 32768

dwf.FDwfDigitalOutConfigure(hdwf, c_int(1))