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-rw-r--r--shared-bindings/sdcardio/SDCard.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/shared-bindings/sdcardio/SDCard.c b/shared-bindings/sdcardio/SDCard.c
index 975f8b095..35d6c1497 100644
--- a/shared-bindings/sdcardio/SDCard.c
+++ b/shared-bindings/sdcardio/SDCard.c
@@ -55,6 +55,12 @@
//| Data transfers use the specified baurate (rounded down to one that is supported by
//| the microcontroller)
//|
+//| .. important::
+//| If the same SPI bus is shared with other peripherals, it is important that
+//| the SD card be initialized before accessing any other peripheral on the bus.
+//| Failure to do so can prevent the SD card from being recognized until it is
+//| powered off or re-inserted.
+//|
//| Example usage:
//|
//| .. code-block:: python