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Compact flash card uses a parallel interface, SD card uses a serial interface.<br />
Try monitoring the clock and data lines with a scope to see any activity when the card does not respond.<br />

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Compact flash card uses a parallel interface, SD card uses a serial interface.
Try monitoring the clock and data lines with a scope to see any activity when the card does not respond.


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We're trying to read and write to an SD card using a PIC18F452. CMD0 and CMD1 work (to initialize the SD card into SPI mode), but any other command after that including CMD0 and CMD1 don't respond.<br />
<br />
Any help wil be greatly appreciated.
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We're trying to read and write to an SD card using a PIC18F452. CMD0 and CMD1 work (to initialize the SD card into SPI mode), but any other command after that including CMD0 and CMD1 don't respond.

Any help wil be greatly appreciated.

Reading/Writing to SD Card using a PIC

Components are those devices that are internal to a computer -- the PC boards, the central processor (CPU), the memory (RAM), disk and video controllers and so on.