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53e25d8b55
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6 Commits

Author SHA1 Message Date
Cristian Maglie
53e25d8b55 [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.
 2014-11-25 15:49:17 +01:00
Cristian Maglie
993cc9bbb4 [avr] Small comments and headers fixes in SPI 2014-11-14 00:23:11 +01:00
PaulStoffregen
3d5ef6d5d9 SPI Transactions for AVR 2014-08-01 05:38:27 -07:00
Cristian Maglie
d5c828736b Revert "SPI library to new format" 2013-11-21 15:05:36 +01:00
Fede85
2371e2ce0d SPI library to the new format and moved Robot_Motor and Robot_Control libraries 2013-07-03 22:00:02 +02:00
Cristian Maglie
57b8713cab Moved libraries folder inside platform folder. Now libraries and examples are searched per board/platform 2012-01-04 15:14:51 +01:00