The MMC/SD connector on the STM-P103 seems to be wired for use in native MMC mode, with one bi-directional data line and one clock. The STM32f103 chip, on the other hand, has an SPI interface that uses data in and data out: if it can do MMC mode there’s very little in the STM32f10x reference manual …

STM32-P103 MMC/SD interface

embedded-os May 28, 2008, 10:13pm 5

see my example-code for some ARMs:

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