gd2-lib
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microSD detection should timeout
Currently microSD detection can hang - or take a very long time to finish - if the card is missing.
It should all timeout in under 500 ms, worst case.
User report: http://gameduino2.proboards.com/thread/402/demo-program-radarchart-long-start
Also when microSD fails, it currently leaves SPI running in slow mode. Should restore to fast mode.