基于5402的虚拟仪器源码，可测量20K以内的 频率，直流偏置，峰峰值。文件列表: freqcout ........\cc_build_Debug.log ........\Debug ........\Debug.lkf ........\Debug.lkv ........\freqcnt.c ........\freqcnt.cmd ........\freqcnt.map ........\freqcnt.out ........\freqcnt.x00 ........\freqcnt.x01 ........\freqcout.paf ........\freqcout.pjt ........\globleio.h ........\init.asm……