Mainly achieved through the FPGA NIOS, the pairs of SD to perform initialization, reading and writing file content, but it is in the form of blocks written into the SD inside, rather than. TXT written form.

C20_SD\.sopc_builder\install.ptf
......\C20_BGA_SD.asm.rpt
......\C20_BGA_SD.bdf
......\C20_BGA_SD.done
......\C20_BGA_SD.fit.eqn
......\C20_BGA_SD.fit.rpt
......\C20_BGA_SD.fit.summary
......\C20_BGA_SD.flow.rpt
......\C20_BGA_SD.map.eqn
......\C20_BGA_SD.map.rpt
......\C20_BGA_SD.map.summary
......\C20_BGA_SD.pin
......\C20_BGA_SD.pof
......\C20_BGA_SD.qpf
......\C20_BGA_SD.qsf
......\C20_BGA_SD.qws
......\C20_BGA_SD.sof
......\C20_BGA_SD.tan.rpt
......\C20_BGA_SD.tan.summary
......\cpu_0.ocp
......\cpu_0.v
......\cpu_0_jtag_debug_module.v
......\cpu_0_jtag_debug_module_wrapper.v
......\cpu_0_ociram_default_contents.mif
......\cpu_0_test_bench.v
......\jtag_uart_0.v
......\Nios.bsf
......\Nios.ptf
......\Nios.ptf.bak
......\Nios.v
......\Nios_generation_script
......\Nios_log.txt
......\Nios_setup_quartus.tcl
......\......im\atail-f.pl
......\........\dummy_file
......\........\jtag_uart_0_input_mutex.dat
......\........\jtag_uart_0_input_stream.dat
......\........\jtag_uart_0_output_stream.dat
......\........\uart_0_input_data_mutex.dat
......\........\uart_0_input_data_stream.dat
......\........\uart_0_log_module.txt
......\onchip_memory_0.hex
......\onchip_memory_0.v
......\rf_ram.mif
......\SD_CS.v
......\SD_PWR.v
......\setup.tcl
......\.oftware\C20_BGA_SD\.cdtbuild
......\........\..........\.cdtproject
......\........\..........\.project
......\........\..........\application.stf
......\........\..........\avalon_spi.c
......\........\..........\avalon_spi.h
......\........\..........\Debug\C20_BGA_SD.elf
......\........\..........\.....\generated_app.sh
......\........\..........\.....\makefile
......\........\..........\.....\obj\avalon_spi.d
......\........\..........\.....\...\avalon_spi.o
......\........\..........\.....\...\main.d
......\........\..........\.....\...\main.o
......\........\..........\.....\...\sdcmd.d
......\........\..........\.....\...\sdcmd.o
......\........\..........\.....\...\sdcrc.d
......\........\..........\.....\...\sdcrc.o
......\........\..........\.....\...\sddriver.d
......\........\..........\.....\...\sddriver.o
......\........\..........\.....\...\sdhal.d
......\........\..........\.....\...\sdhal.o
......\........\..........\.....\subdir.mk
......\........\..........\main.c
......\........\..........\sdcmd.c
......\........\..........\sdcmd.h
......\........\..........\sdconfig.h
......\........\..........\sdcrc.c
......\........\..........\sdcrc.h
......\........\..........\sddriver.c
......\........\..........\sddriver.h
......\........\..........\sdhal.c
......\........\..........\sdhal.h
......\........\.........._syslib\.cdtbuild
......\........\.................\.cdtproject
......\........\.................\.project
......\........\.................\Debug\crt0.d
......\........\.................\.....\crt0.o
......\........\.................\.....\libC20_BGA_SD_syslib.a
......\........\.................\.....\makefile
......\........\.................\.....\obj\altera_avalon_jtag_uart.d
......\........\.................\.....\...\altera_avalon_jtag_uart.o
......\........\.................\.....\...\altera_avalon_spi.d
......\........\.................\.....\...\altera_avalon_spi.o
......\........\.................\.....\...\altera_avalon_uart.d
......\........\.................\.....\...\altera_avalon_uart.o
......\........\.................\.....\...\alt_alarm_start.d
......\........\.................\.....\...\alt_alarm_start.o
......\........\.................\.....\...\alt_busy_sleep.d
......\........\.................\.....\...\alt_busy_sleep.o
......\........\.................\.....\...\alt_close.d
......\........\.................\.....\...\alt_close.o
......\........\.................\.....\...\alt_dcache_flush.d
......\........\.................\.....\...\alt_dcache_flush.o

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