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| New Scope Demoboard from Batronix |
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| pdenisowski:
--- Quote from: Martin72 on June 07, 2023, 08:22:33 pm ---Serial decodings: Did you get a "jitterfree" stable signal on your scope ? --- End quote --- Yes, very stable. I can make a short video if you like. |
| Martin72:
Would be nice ! :-+ |
| pdenisowski:
--- Quote from: Martin72 on June 07, 2023, 10:24:42 pm ---Would be nice ! :-+ --- End quote --- Okay, I think I know what you mean by "jittter" on the signal. The decode is stable, but there does appear to be some "jittter" in the waveforms. I tried a rising edge trigger on the clock signal (as shown in the video) as well as a falling edge trigger on CS / SS and got the same behavior. The MXO4 also supports a protocol "Start of Frame" trigger which, unsurprisingly, also showed the same behavior. I think the next step would be to analyze the individual channels (CS and CLK) and plot a jitter histogram of each one. I could also rebuild the circuit that I used for my "Understanding SPI" video and check if I see the same behavior. I should note however that this "jitter" doesn't affect my ability to decode the SPI signal. |
| Martin72:
This is way more stable than mine, I´ll make a short clip in the next days. And: As I mentioned before, my siglent decode it correctly, you can see it best when in stop mode. |
| tautech:
--- Quote from: Martin72 on June 07, 2023, 08:22:33 pm ---Serial decodings: Did you get a "jitterfree" stable signal on your scope ? --- End quote --- That can only be a result of trigger settings, if using a serial trigger then it's triggering on duplicate bits in a packet or successive packets carrying the same bit. If using an edge trigger in the screenshot below from STB-3 and SDS1204X HD Holdoff longer than packet length needs be applied to obtain rock solid triggering. Here the packet header never changes however the payload does with each packet. |
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