Hi.
I'm new to this mailing-list and I'd like to say thanks to every developers
of this project. I think this project is wonderful for non-Windows users.
I sent several patches for usbee dx yesterday, but I'm not sure that those
meet your requirements.
And I'd like to ask several questions.
1. usbee dx analog signal has some delay, compared with digital sample of
the same signal, about 180ns when captured 1Mhz square wave signal with
12MHz sampling rate. Delay becomes longer with lower sampling rates. I
think this can be synced on GUI front-end with analog signal drawing in a
time-shifted way. I checked pulseview's signal drawing routines but it's
beyond me. Could you give me any hint?
2. I think libsigrok supports several oscilloscopes and it might have a
device configuration enumeration value for analog trigger level, but I
can't find it. should it be defined as something like SR_CONF_TRIGGER_LEVEL?
3. The patches support pre-triggered samples and horizontal trigger
position of a specific buffer. Does pulseview have a feature to draw
pre-triggered samples in negative time area or to draw a trigger mark?
I know sigrok and pulseview is designed for logic analyzer mainly, and
supporting other devices like oscilloscope is in work-in-progress. I think
generalized device configuration values for a specific device category like
oscilloscope is useful, otherwise libsigrok would have a bunch of
duplicated, device-specific configuration enumeration values. Of course,
defining those values needs insight and knowledge of various measurement
devices. Oh, its not an easy job.
Anyway, thanks developers, I don't need to reboot my old laptop to play
with a toy any more.
I uploaded a few screen shots of pulseview with usbee dx.
usbee_dx_ch1_12mhz_square_wave_100khz:
http://tinypic.com/r/a40qw8/5
usbee_dx_ch1_24mhz_square_wave_1mhz:
http://tinypic.com/r/scqr9c/5
Thanks,
Jong-Jin
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