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SPI with a Blindfold On- speed up by letting go and trusting the machine

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Via josh.com

Constantly checking to see if the coast is clear feels responsible, but it wastes cycles. Sometimes it is better to leap (or load) without looking. With a little hand-coded assembly, we can run our AVR processor lock-step with the SPI hardware and blindly dump new bytes into it at precisely the right moment. Because we don’t spend any time reading and testing status bits, we can increase the maximum throughput by more than 20%. If the prospect of screamingly fast yet perfectly safe SPI turns you on, read on…

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1 Comment

  1. https://github.com/tz1/sparkfun/blob/master/fat32lib/sdhc.c

    fast reads and writes for an SDHC card.

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