此为我们组在09年全国电设做的数字幅频均衡器的基于周立功ARM1138的代码，主要文件为里面的FIR.c（数字IIR滤波）和DAC904.c(DAC904的驱动)-This is our group code about amplitude-frequency based on ZLG ARM1138in 2009 native electric designequalizer ,inside the main document for the FIR.c (Digital IIR filte