Date: 2016-11-10 09:27 am (UTC)
опять же в доках
Normal open() and close() operations on /dev/spidevB.D files work as you would expect.
Standard read() and write() operations are obviously only half-duplex, and the chipselect is deactivated between those operations. Full-duplex access, and composite operation without chipselect de-activation, is available using the SPI_IOC_MESSAGE(N) request.

>Потому что вместо работы с одним-единственным файлом и сисвызовами read/write приходится работать с толпой файлов!
а это уж на совести разрабочика, sysfs тут не причём
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