基于SOPC音频采样与回放

QuartusII9.1(32-Bit)，NiosII9.1SoftwareBuildToolsforEclipse上调试成功，可直接将DE2_nios.sof、sound.elf两个文件直接下在DE2板上运行。使用方法如下：KEY3:RecordStart/StopKEY2:PlayStart/StopSW0:AudioSourceSelection.DOWN-->MIC,UP-->LINE-INSW5/SW4/SW3:SampleRateControl,"DOWN/DOWN/DOWN-->96K,"