基于S3C2440A的IIS的Audio功能实现（测试已通过），外部接的CODEC是UDA1341TS 代码作用(基于ADS，有助于理解基于IIS的音频支持)-S3C2440A based on the IIS the Audio functions (test has passed), the CODEC is an external access code UDA1341TS role (based on ADS, contribute to an understanding of II