SD card read and write, SPI

hello_sd\.cproject
........\.project
........\Debug\hello_sd.elf
........\.....\hello_sd.elf.elfcheck
........\.....\hello_sd.elf.size
........\.....\makefile
........\.....\objects.mk
........\.....\sources.mk
........\.....\.rc\hello_sd.d
........\.....\...\hello_sd.o
........\.....\...\platform.d
........\.....\...\subdir.mk
........\src\hello_sd.c
........\...\lscript.ld
........\...\sd_header.h
........\Debug\src
........\Debug
........\src
hello_sd

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