STM32F4xx has internal SDIO peripheral to work with SD cards. Also, SDIO communication is faster than SPI, but if you don’t need speed in your project, you can use SPI aswell. With default settings, SDIO 4-bit mode communication is used. It means, that you need all four data lines. SDIO also supports 1-bit mode, where you need only Data0, CMD and CLK pins. To activate 1-bit mode, add this to your defines.h

MDK-ARM\Project.plg
.......\Project.uvopt
.......\Project.uvproj
.......\Project_GPIO_LED.dep
.......\Project_Multi Media Development Board V1.0.dep
.......\Project_Multi Media Development Board.dep
.......\Project_Target 1.dep
.......\Project_uvopt.bak
.......\Project_uvproj.bak
.......\stm32f10x_adc.d
USER\main.c
....\SD_Card\sdio_sd.c
....\.......\sdio_sd.h
....\stm32f10x_conf.h
....\stm32f10x_it.c
....\stm32f10x_it.h
....\system_stm32f10x.c
readme.txt
MDK-ARM\List
.......\Obj
USER\SD_Card
MDK-ARM
USER

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