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<div><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);" class="elementToProof">Yes. The original SPI 'spec' stated a maximum number of words per transfer so that
everybody supported that, but some MCUs just extend it to infinity subject to DMA and memory limits.<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Jonatan Liljedahl <lijon@kymatica.com><br>
<b>Sent:</b> 11 December 2023 16:47<br>
<b>To:</b> Mike Bryant <mbryant@futurehorizons.com><br>
<b>Cc:</b> SDIY <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Generating a large number of CV outputs</font>
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<div dir="auto">Maybe that was the problem then! What exactly is continuous mode? No gaps between words?<br clear="all">
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<div dir="ltr" class="x_gmail_signature" data-smartmail="gmail_signature">/Jonatan<br>
<a href="http://kymatica.com" target="_blank">http://kymatica.com</a></div>
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<div dir="ltr" class="x_gmail_attr">mån 11 dec. 2023 kl. 17:00 skrev Mike Bryant <<a href="mailto:mbryant@futurehorizons.com">mbryant@futurehorizons.com</a>>:<br>
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<div><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">Using SPI requires continuous mode which I'm not sure most STM32s support.<br>
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<div id="x_m_-6862186884353972897divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt; font-family:Calibri,sans-serif; color:rgb(0,0,0)"><b style="font-family:Calibri,sans-serif">From:</b> Synth-diy <<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank" style="font-family:Calibri,sans-serif">synth-diy-bounces@synth-diy.org</a>>
on behalf of Jonatan Liljedahl <<a href="mailto:lijon@kymatica.com" target="_blank" style="font-family:Calibri,sans-serif">lijon@kymatica.com</a>><br>
<b style="font-family:Calibri,sans-serif">Sent:</b> 11 December 2023 15:49<br>
<b style="font-family:Calibri,sans-serif">To:</b> SDIY <<a href="mailto:synth-diy@synth-diy.org" target="_blank" style="font-family:Calibri,sans-serif">synth-diy@synth-diy.org</a>></font></div>
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<b style="font-family:Calibri,sans-serif">Subject:</b> Re: [sdiy] Generating a large number of CV outputs</font>
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<div>I did a similar plot when I was experimenting with<br>
sigma-delta/noise-shaping output from an STM32, but in ASCII :)<br>
There's one trick where an SPI peripheral is used for "high quality"<br>
audio PDM output, but I never was able to get any usable performance<br>
from it. I even got better results just using 8 bit PWM but with<br>
sigma-delta noise shaping. (But I settled on using the built-in 12 bit<br>
DAC instead)<br>
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Cheers<br>
/Jonatan<br>
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On Mon, Dec 11, 2023 at 4:19 PM Roman Sowa <<a href="mailto:modular@go2.pl" target="_blank">modular@go2.pl</a>> wrote:<br>
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> This is awesome! Such a simple trick helps to visualize it so quickly.<br>
> Testing different patterns to further minimize any repeatability seems<br>
> like pleasant adventure now and doesn't even require any test equipment.<br>
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> Roman<br>
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-- <br>
/Jonatan<br>
<a href="http://kymatica.com" target="_blank">http://kymatica.com</a><br>
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