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Switching between kernel versions in raspberry pi 4

It's odd that all those module directories have been left around; apt usually removes them when a new kernel is installed. RpiOS implements the unusual (GNU/Linux wise) policy of replacing kernels on ...
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Uninterrupted, endless SPI transfer - is it possible?

You should be able to get more-or-less uninterrupted SPI transfers using DMA, as described here. There will be a brief pause when one DMA transfer ends and another begins, but that shouldn't be ...
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