PropScope on Linux
BradC
Posts: 2,601
Here's an ~20 Khz square wave with slow rise/fall times and the NTSC video output of my Demo board captured at 25MSPS.
Image 1 is 1000 samples long. There is nice definition of the colour burst there.
Image 2 is 6000 samples long (refresh rate drops quite a lot with longer sample rates of course).
Both images have precisely the same sample definition, it's just scaled to fit 6000 samples into the same space. The raw data has the same accuracy.
It's a start.
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"Are you suggesting coconuts migrate?"
Post Edited (BradC) : 5/18/2010 3:55:03 AM GMT
Image 1 is 1000 samples long. There is nice definition of the colour burst there.
Image 2 is 6000 samples long (refresh rate drops quite a lot with longer sample rates of course).
Both images have precisely the same sample definition, it's just scaled to fit 6000 samples into the same space. The raw data has the same accuracy.
It's a start.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
"Are you suggesting coconuts migrate?"
Post Edited (BradC) : 5/18/2010 3:55:03 AM GMT
1600 x 1148 - 60K
1600 x 1200 - 93K
Comments
I will finally buy a prop scope since this is the case..
Congratulations, it looks like you are making quick progress with the PropScope! We really like to see it when customers make use of the documentation we release, especially for hardware with an open-source design. It takes time and resources to document products for open-source release, and it is good to know that that time was well spent. The more the community contributes, the more worthwhile it is for us to contribute too.
— David Carrier
Parallax Inc.
P.S. It looks like your NTSC signal is inverted.
Slowly, but yes. Don't rush out and buy one just yet though. I really can't guarantee how far I'll get or how fast I'll go, but I have one and I want to be able to use it (the supplied software was slower than glacial in a VM on my machine - like 5 seconds to see an update when I turned the freq knob on my signal generator).
@David Carrier, yes those plots had both channels inverted. CH1 & CH2 were also swapped (I had the MUX pin floating).
The documentation makes the hardware pretty easy to use.
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"Are you suggesting coconuts migrate?"
Keep us updated!
You can blame Ken for sending me one.
Roger, will do.
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"Are you suggesting coconuts migrate?"