arm (str710) usb function realize, are able to show that letter, plus storage medium can realize u disk function.

usb_mass
........\source
........\......\chipset
........\......\.......\drv_app
........\......\.......\.......\core_files
........\......\.......\.......\..........\TFXE7.tmp
........\......\.......\.......\..........\usb_core.c
........\......\.......\.......\..........\usb_core.h
........\......\.......\.......\..........\usb_def.h
........\......\.......\.......\..........\usb_init.c
........\......\.......\.......\..........\usb_init.h
........\......\.......\.......\..........\usb_int.c
........\......\.......\.......\..........\usb_int.h
........\......\.......\.......\..........\usb_lib.h
........\......\.......\.......\..........\usb_regs.c
........\......\.......\.......\..........\usb_regs.h
........\......\.......\.......\..........\usb_type.h
........\......\.......\.......\mouse_demo
........\......\.......\.......\..........\mouse.c
........\......\.......\.......\..........\mouse.h
........\......\.......\.......\..........\usb_conf.h
........\......\.......\.......\..........\usb_desc.c
........\......\.......\.......\..........\usb_desc.h
........\......\.......\.......\..........\usb_endp.c
........\......\.......\.......\..........\usb_istr.c
........\......\.......\.......\..........\usb_mem.c
........\......\.......\.......\..........\usb_mem.h
........\......\.......\.......\..........\usb_prop.c
........\......\.......\.......\..........\usb_prop.h
........\......\.......\.......\..........\usb_pwr.c
........\......\.......\.......\..........\usb_pwr.h
........\......\.......\.......\..........\usb_rw.c
........\......\.......\.......\..........\usb_rw.h
........\......\.......\.......\serial
........\......\.......\.......\......\uart_api.c
........\......\.......\.......\......\uart_api.h
........\......\.......\drv_core
........\......\.......\........\adc12.c
........\......\.......\........\adc12.h
........\......\.......\........\apb.c
........\......\.......\........\apb.h
........\......\.......\........\bspi.c
........\......\.......\........\bspi.h
........\......\.......\........\can.c
........\......\.......\........\can.h
........\......\.......\........\cpu_cfg.h
........\......\.......\........\drv_core.h
........\......\.......\........\eic.c
........\......\.......\........\eic.h
........\......\.......\........\emi.c
........\......\.......\........\emi.h
........\......\.......\........\flash.c
........\......\.......\........\flash.h
........\......\.......\........\gpio.c
........\......\.......\........\gpio.h
........\......\.......\........\i2c.c
........\......\.......\........\i2c.h
........\......\.......\........\pcu.c
........\......\.......\........\pcu.h
........\......\.......\........\rccu.c
........\......\.......\........\rccu.h
........\......\.......\........\rtc.c
........\......\.......\........\rtc.h
........\......\.......\........\tim.c
........\......\.......\........\tim.h
........\......\.......\........\uart.c
........\......\.......\........\uart.h
........\......\.......\........\wdg.c
........\......\.......\........\wdg.h
........\......\.......\........\xti.c
........\......\.......\........\xti.h
........\......\.......\system
........\......\.......\......\AddrMap.SCF
........\......\.......\......\Bootloader.s
........\......\.......\......\ChipInit.s
........\......\.......\......\init.c
........\......\.......\......\init.h
........\......\.......\......\irq.c
........\......\.......\......\irq.h
........\......\header
........\......\......\config.h
........\......\......\str710.h
........\......\......\types.h
........\......\user
........\......\....\main.c
........\......\....\sleep.c
........\......\....\sleep.h
........\usb.mcp
........\usb_Data
........\........\CWSettingsWindows.stg
........\........\Debug
........\........\DebugRel
........\........\........\led.bin
........\........\........\ObjectCode
........\........\........\..........\adc12.o
........\........\........\..........\apb.o
........\........\........\..........\Bootloader.o
........\........\........\..........\bspi.o
........\........\........\..........\ChipInit.

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