arduino/Arduino — pull request #2460 by PaulStoffregen (2014-11-21 02:57:19+00:00)
Title: Fix SPI transaction mismatch errors

While testing with Adafruit nRF8001, I discovered a bug with my previous attempt to add SPI transactions to SD. The SD library calls chipSelectLow() repeatedly, even when the chip select is already low. This tiny change is needed to make SPI transactions match properly.