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      If you have just one SPI slave, maybe you can enable the slave by driving its nCS with a constant. BUT: not all SPI slave devices work this way: some chips require to toggle nCS so that the chip can "see" a completed SPI transaction. Not really...
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      On a Master you could use any GPIO pin as a CSn, running it in SW mode. But on a Slave, if you want to use CSn (to enable a slave from a master, e.g. selecting 1 of N slaves) - it has to be a dedicated CSn pin for this SPI slave. You can look...
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