基于niosII的sd卡读写程序

在niosII上实现了SD卡的读写程序，我是在DE2的板子上运行的，可以读写文件，适合移植到其他平台上，文件系统是FAT16以及FAT32格式的，不支持其他文件格式。

DE2_SDCARD
software
incremental_db
demo_batch
DE2_SOPC_sim
DE2_SOPC_generation_script
.sopc_builder
filters.xml
.sopc_builder
cpu_0.ocp
cpu_0.sdc
cpu_0.v
cpu_0_bht_ram.mif
cpu_0_data_master_arbitrator.bsf
cpu_0_dc_tag_ram.mif
cpu_0_ic_tag_ram.mif
cpu_0_instruction_master_arbitrator.bsf
cpu_0_jtag_debug_module_arbitrator.bsf
cpu_0_jtag_debug_module_sysclk.v
cpu_0_jtag_debug_module_tck.v
cpu_0_jtag_debug_module_wrapper.v
cpu_0_mult_cell.v
cpu_0_ociram_default_contents.mif
cpu_0_oci_test_bench.v
cpu_0_rf_ram_a.mif
cpu_0_rf_ram_b.mif
cpu_0_test_bench.v
DE2_SDCARD.asm.rpt
DE2_SDCARD.done
DE2_SDCARD.dpf
DE2_SDCARD.fit.rpt
DE2_SDCARD.fit.smsg
DE2_SDCARD.fit.summary
DE2_SDCARD.flow.rpt
DE2_SDCARD.jdi
DE2_SDCARD.map.rpt
DE2_SDCARD.map.smsg
DE2_SDCARD.map.summary
DE2_SDCARD.pin
DE2_SDCARD.pof
DE2_SDCARD.qpf
DE2_SDCARD.qsf
DE2_SDCARD.qsf.bak
DE2_SDCARD.qws
DE2_SDCARD.sof
DE2_SDCARD.tan.rpt
DE2_SDCARD.tan.summary
DE2_SDCARD.v
DE2_SDCARD.v.bak
DE2_SOPC.bsf
DE2_SOPC.html
DE2_SOPC.ptf
DE2_SOPC.ptf.8.0
DE2_SOPC.ptf.bak
DE2_SOPC.ptf.pre_generation_ptf
DE2_SOPC.qip
DE2_SOPC.sopc
DE2_SOPC.sopcinfo
DE2_SOPC.v
DE2_SOPC_inst.v
DE2_SOPC_log.txt
DE2_SOPC_reset_clk_0_domain_synch_module.bsf
jtag_uart_0.v
jtag_uart_0_avalon_jtag_slave_arbitrator.bsf
onchip_memory2_0.hex
onchip_memory2_0.v
onchip_memory2_0_s1_arbitrator.bsf
pio_buttons.v
pio_buttons_s1_arbitrator.bsf
pio_leds.v
pio_leds_s1_arbitrator.bsf
sd_clk.v
sd_clk_s1_arbitrator.bsf
sd_cmd.v
sd_cmd_s1_arbitrator.bsf
sd_dat.v
sd_dat_s1_arbitrator.bsf
sopc_add_qip_file.tcl
sopc_builder_log.txt
sysid.v
sysid_control_slave_arbitrator.bsf
timer_0.v
timer_0_s1_arbitrator.bsf