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- The best source of recent information is the Arduino forum
-
- http://arduino.cc/forum/
-
- Also search the Adafruit forum
-
- http://forums.adafruit.com/
-
- If you are using a Teensy try
-
- http://forum.pjrc.com/forum.php
-
- Try running the SdInfo sketch in the SdFat/examples folder to get
- more information.
-
-
- The most common problems are:
-
- --------------------------------------------------------------------------------
- Wiring errors with card.init() failure and errorCode == 1. This means the
- first command, CMD0 - SPI init, failed. SdFat is not seeing the card.
- This is a basic hardware problem. Do not reformat your SD.
- --------------------------------------------------------------------------------
- card.init() failures caused by resistor SPI level shifters. Some, mostly older,
- SD cards work with resistor level shifters but may be flaky with random errors.
-
- Many newer SD cards have edge detectors and fail with errorCode() = 1. These
- cards will not work with resistor level shifters since SdFat does not see the
- card at low SPI clock rate.
-
- Other cards fail with an errorCode() > 1. These cards see SD commands at low
- SPI clock rate but fail at higher SPI clock rate. It may be possible to use
- these cards by replacing card.init() with card.init(SPI_HALF_SPEED).
- This will slow the the SPI clock by 50%.
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