HDD MP3 schematic, there are specific implementation and protel schematic and code,so i think you will I believe you will gain something.

atmel\aud_drv.lst
.....\aud_drv.obj
.....\clock.lst
.....\clock.obj
.....\config.h
.....\fat.lst
.....\fat.obj
.....\file.lst
.....\file.obj
.....\fs_variable.lst
.....\fs_variable.obj
.....\ideio.lst
.....\ideio.obj
.....\key_drv.lst
.....\key_drv.obj
.....\lcd_drv.lst
.....\lcd_drv.obj
.....\.ib_mcu\adc\adc.html
.....\.......\...\adc_drv.c
.....\.......\...\adc_drv.h
.....\.......\adc
.....\.......\.ud\aud.html
.....\.......\...\audio.c
.....\.......\...\aud_drv.c
.....\.......\...\aud_drv.h
.....\.......\aud
.....\.......\c51_drv.h
.....\.......\.lock\clock.c
.....\.......\.....\clock.h
.....\.......\.....\clock.html
.....\.......\clock
.....\.......\compiler.h
.....\.......\extsnd1.h
.....\.......\ide\harddisc.h
.....\.......\...\ideio.c
.....\.......\...\ideio.h
.....\.......\ide
.....\.......\kbd\kbd.html
.....\.......\...\kbd_drv.c
.....\.......\...\kbd_drv.h
.....\.......\...\key_drv.c
.....\.......\...\key_drv.h
.....\.......\kbd
.....\.......\lcd\lcd_drv.c
.....\.......\...\lcd_drv.h
.....\.......\lcd
.....\.......\lib_mcu.html
.....\.......\mmc\mmc.html
.....\.......\...\mmc_drv.c
.....\.......\...\mmc_drv.h
.....\.......\mmc
.....\.......\.p3\mp3.html
.....\.......\...\mp3_drv.c
.....\.......\...\mp3_drv.h
.....\.......\mp3
.....\.......\pll\pll.html
.....\.......\...\pll_drv.h
.....\.......\pll
.....\.......\regsnd1.h
.....\.......\serial\serial.c
.....\.......\......\serial.h
.....\.......\serial
.....\.......\.pi\spi.html
.....\.......\...\spi_drv.c
.....\.......\...\spi_drv.h
.....\.......\spi
.....\.......\timer\timer.html
.....\.......\.....\timer_drv.c
.....\.......\.....\timer_drv.h
.....\.......\timer
.....\.......\.wi\twi.html
.....\.......\...\twi_lib.c
.....\.......\...\twi_lib.h
.....\.......\twi
.....\.......\usb\usb.h
.....\.......\...\usb.html
.....\.......\...\usbtask.h
.....\.......\...\usb_drv.c
.....\.......\...\usb_drv.h
.....\.......\usb
.....\.......\wdt\wdt.html
.....\.......\...\wdt_drv.h
.....\.......\wdt
.....\lib_mcu
.....\....refd\board.h
.....\........\dac\dac.html
.....\........\...\dac_drv.c
.....\........\...\dac_drv.h
.....\........\dac
.....\........\lib_refd.html
.....\lib_refd
.....\....storage\lib_storage.html
.....\...........\sbc.c
.....\...........\sbc.h
.....\...........\sbc.lib
.....\...........\sbc_nf.lib
.....\lib_storage
.....\main.c
.....\main.LST
.....\main.OBJ

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