Play music, and finally realize button a button and realize the buzzer singing, based on DSP, class experiment content.

ll sound new\ll sound\5509.h
............\........\c5509.h
............\........\c55xxdefs.h
............\........\cc_build_Debug.log
............\........\Debug.lkf
............\........\Debug.lkv
............\........\func.h
............\........\ICETEK-VC5509-A.cmd
............\........\ICETEK-VC5509-EDU.h
............\........\main.c
............\........\myapp.h
............\........\peripherals.h
............\........\scancode.h
............\........\sdram_init.c
............\........\Speaker.paf
............\........\Speaker.paf2
............\........\Speaker.pjt
............\........\Speaker.sbl
............\........\util.c
............\........\util.h
............\........\vectors.asm
............\........\Debug\clk_init.obj
............\........\.....\main.obj
............\........\.....\sdram_init.obj
............\........\.....\Speaker.map
............\........\.....\Speaker.out
............\........\.....\util.obj
............\........\.....\vectors.obj
............\........\Speaker.CS_\FILE.CDX
............\........\...........\FILE.DBF
............\........\...........\FILE.FPT
............\........\...........\SYMBOL.CDX
............\........\...........\SYMBOL.DBF
............\........\...........\SYMBOL.FPT
............\........\Debug
............\........\Speaker.CS_
............\ll sound
ll sound new

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