Level Converters on microSD cards
Topic: Level Converters on microSD cards
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Re: Level Converters on microSD cards
Jun 26, 2013, 07:26 pm
Ashley, try re-reading the same 144 bytes (non-block crossing, 108-120 us), alternating between the hardware.
From what you are saying, you are getting consistent but different speeds when reading (copying) from RAM cache to your RAM buffer, depending on the electrical connection between the SD card and Arduino - which should not matter at all since the SPI bus is not used (and which actually shouldn't matter even if it was given the synchronous SPI bus, but that's another matter).
Does that happen even re-reading the same bytes?