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Fix csLow without corresponding csHigh #5

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Fix csLow without corresponding csHigh #5

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mikeanthonywild
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csLow() sets the SPI speed to 4MHz, so when ADS_SS is toggled high again, the SPI speed needs to be set back to the default 20MHz used for the SD card.

Bug fix
a48d950 
Use csHigh() instead of digitalWrite() to ensure SPI clock is returned to 20MHz for SD card
@mikeanthonywild
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This was reported a while ago: OpenBCI/V3_Hardware_Design_Files#1 (comment) but never fixed.

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