How to delay signal pattern and choice how many time it repeat/ Can I use a save in python ?

[Mathias G.]

Hello !

I have yet the ADP3450 and I want to recreate a specific signal with a delay (of 6.3 us) and only 1 repeat for just one pattern with the python and the SDK library. 

I have a second question, can I use a save of a project to launch the pattern generator in python ?

(On the picture you have just a part of the code) 

seq1 TEST DOUBLE.py

Edited June 9, 2023 by Mathias G.

[attila]

Hi @Mathias G.

Yes.
The 'repetition' for each line can be specified using FDwfDigitalOutRepetitionSet, this is supported by Digital Discovery, ADP3X50

[attila]

Hi @Mathias G.

Use FDwfDigitalOutRunSet(seconds), FDwfDigitalOutRepeatSet(1) and FDwfDigitalOutDividerInitSet(hz_sys_freq * sec_delay)

[Mathias G.]

37 minutes ago, attila said:

Hi @Mathias G.

Use FDwfDigitalOutRunSet(seconds), FDwfDigitalOutRepeatSet(1) and FDwfDigitalOutDividerInitSet(hz_sys_freq * sec_delay)

Functions DORunSet and DORepeatSet work only for all pin not a specific one, that's right ?

Edited June 9, 2023 by Mathias G.

[Mathias G.]

10 hours ago, attila said:

Hi @Mathias G.

Yes.
The 'repetition' for each line can be specified using FDwfDigitalOutRepetitionSet, this is supported by Digital Discovery, ADP3X50

Hi @attila !

Thanks you for your quick answer (you are a little faster than me for that's ^^ )

[Mathias G.]

On 6/9/2023 at 1:56 PM, attila said:

Hi @Mathias G.

Use FDwfDigitalOutRunSet(seconds), FDwfDigitalOutRepeatSet(1) and FDwfDigitalOutDividerInitSet(hz_sys_freq * sec_delay)

Hi @attila

I have a new question about the FDwfDigitalOutDividerInitSet function : if I have a clock of 1KHz (generate by a pulse signal), how can I create a delay of 60 us or 1ms ? I try but don't understand how to set the function... 

[attila]

Hi @Mathias G.

channel = c_int(0)
hzSys = c_double()
dwf.FDwfDigitalOutInternalClockInfo(hdwf, byref(hzSys))
dwf.FDwfDigitalOutEnableSet(hdwf, channel, c_uint(1))
dwf.FDwfDigitalOutCounterSet(hdwf, channel, c_uint(1), c_uint(1)) # 1 low 1 high
dwf.FDwfDigitalOutDividerSet(hdwf, channel, c_uint(int(hzSys.value/1e3/2))) # 1kHz = 0.5ms x (1 low + 1 high)
dwf.FDwfDigitalOutDividerInitSet(hdwf, channel, c_uint(int(hzSys.value*(0.5e-3+60e-6)-1)) # 0.5ms + 60us
or
dwf.FDwfDigitalOutDividerInitSet(hdwf, channel, c_uint(int(hzSys.value*(0.5e-3+1e-3)-1))) # 0.5ms + 1ms

[Mathias G.]

56 minutes ago, attila said:

Hi @Mathias G.

channel = c_int(0)
hzSys = c_double()
dwf.FDwfDigitalOutInternalClockInfo(hdwf, byref(hzSys))
dwf.FDwfDigitalOutEnableSet(hdwf, channel, c_uint(1))
dwf.FDwfDigitalOutCounterSet(hdwf, channel, c_uint(1), c_uint(1)) # 1 low 1 high
dwf.FDwfDigitalOutDividerSet(hdwf, channel, c_uint(int(hzSys.value/1e3/2))) # 1kHz = 0.5ms x (1 low + 1 high)
dwf.FDwfDigitalOutDividerInitSet(hdwf, channel, c_uint(int(hzSys.value*(0.5e-3+60e-6)-1)) # 0.5ms + 60us
or
dwf.FDwfDigitalOutDividerInitSet(hdwf, channel, c_uint(int(hzSys.value*(0.5e-3+1e-3)-1))) # 0.5ms + 1ms

Hi @attila

So I have try with this function : dwf.FDwfDigitalOutDividerInitSet(hdwf, channel, c_uint(int(hzSys.value*(0.5e-3+9e-6)-1))

But on the oscilloscope I have a delay of 136us (I have try with few values of delay but each one is false)

Edited June 12, 2023 by Mathias G.

[attila]

Hi @Mathias G.

Try setting the other channel too, like:
dwf.FDwfDigitalOutDividerInitSet(hdwf, channel0, c_uint(int(hzSys.value*(0.5e-3))) 
dwf.FDwfDigitalOutDividerInitSet(hdwf, channel1, c_uint(int(hzSys.value*(0.5e-3 + 90e-6)))