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authorCristian Maglie <c.maglie@bug.st>2014-10-20 19:46:08 +0200
committerCristian Maglie <c.maglie@bug.st>2014-11-25 15:49:17 +0100
commitd4edece7e6698e7687dd8dec1831f9756c8b0017 (patch)
treeb4866effbeb5895f00ab6e620c58d9c5d27263c0 /firmwares/wifishield/wifiHD/src/SOFTWARE_FRAMEWORK/DRIVERS/SPI/spi.h
parent7ee84bdb1eb39dde646ed1859d9fe7d37d4584bf (diff)
[avr] Improved SPI speed on 16bit transfer.
From https://github.com/arduino/Arduino/pull/2376#issuecomment-59671152 Quoting Andrew Kroll: [..this commit..] introduces a small delay that can prevent the wait loop form iterating when running at the maximum speed. This gives you a little more speed, even if it seems counter-intuitive. At lower speeds, it is unnoticed. Watch the output on an oscilloscope when running full SPI speed, and you should see closer back-to-back writes. Quoting Paul Stoffregen: I did quite a bit of experimenting with the NOP addition. The one that's in my copy gives about a 10% speedup on AVR.
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