make SPI speed configurable #85
Description
It seems that some hardware-related issues may be solved when using lower speeds on SPI:
http://forum.arduino.cc/index.php?topic=265651.msg1873345#msg1873345
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It seems that some hardware-related issues may be solved when using lower speeds on SPI:
http://forum.arduino.cc/index.php?topic=265651.msg1873345#msg1873345