Description: In nios, and with the sd card spi core to achieve read and write operations. Operation is quite simple, with the documentation process description is given, the information in the code comments.
To Search:
File list (Check if you may need any files):
nios_spi
........\.metadata
........\.........\.lock
........\.........\.log
........\.........\.mylyn
........\.........\......\contexts
........\.........\......\repositories.xml.zip
........\.........\.plugins
........\.........\........\org.eclipse.cdt.core
........\.........\........\....................\.log
........\.........\........\....................\SD_ctrl.1378273447799.pdom
........\.........\........\....................\SD_ctrl_bsp.1378273435685.pdom
........\.........\........\org.eclipse.cdt.make.core
........\.........\........\.........................\.log
........\.........\........\.........................\SD_ctrl.sc
........\.........\........\.........................\SD_ctrl_bsp.sc
........\.........\........\.........................\specs.c
........\.........\........\.........................\specs.cpp
........\.........\........\org.eclipse.cdt.managedbuilder.core
........\.........\........\org.eclipse.cdt.ui
........\.........\........\..................\adc_ctrl.build.log
........\.........\........\..................\adc_ctrl_bsp.build.log
........\.........\........\..................\da_ctrl.build.log
........\.........\........\..................\da_ctrl_bsp.build.log
........\.........\........\..................\dialog_settings.xml
........\.........\........\..................\SD_ctrl.build.log
........\.........\........\..................\SD_ctrl_bsp.build.log
........\.........\........\..................\software.build.log
........\.........\........\..................\software_bsp.build.log
........\.........\........\org.eclipse.core.resources
........\.........\........\..........................\.history
........\.........\........\..........................\........\10
........\.........\........\..........................\........\..\607249c89d16001310028e46bd35078b
........\.........\........\..........................\........\11
........\.........\........\..........................\........\..\402f228f94f200121838c52e8f1952d8
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........\.........\........\..........................\........\..\c0ccb79c9b16001310028e46bd35078b
........\.........\........\..........................\........\15
........\.........\........\..........................\........\..\602995040ef400121caeb1267b1d7e5d
........\.........\........\..........................\........\16
........\.........\........\..........................\........\..\906d15775cf3001215f199c353482bff
........\.........\........\..........................\........\1a
........\.........\........\..........................\........\..\5073042c01f400121caeb1267b1d7e5d
........\.........\........\..........................\........\1f
........\.........\........\..........................\........\..\904a0460fd1500131a09b55ec6a29dd5
........\.........\........\..........................\........\20
........\.........\........\..........................\........\..\307eb78a9b16001310028e46bd35078b
........\.........\........\..........................\........\21
........\.........\........\..........................\........\..\b010cd9f5af700121ddba5c6484af14b
........\.........\........\..........................\........\23
........\.........\........\..........................\........\..\907cfded06f400121caeb1267b1d7e5d
........\.........\........\..........................\........\24
........\.........\........\..........................\........\..\001c773fc1f500121641b2906895babb
........\.........\........\..........................\........\..\40df7402fff300121caeb1267b1d7e5d
........\.........\........\..........................\........\..\50ab404a33f3001213f2a5cc6f3a37dc
........\.........\........\..........................\........\27
........\.........\........\..........................\........\..\305dcb6880f200121d63c17bd72eef37
........\.........\........\..........................\........\..\409318cb43f3001213f2a5cc6f3a37dc
........\.........\........\..........................\........\29
........\.........\........\...........
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