用汇编写的可以根据电阻网络发送软件发送D [单片机开发] 用C＋＋写的DTMF求各波形点的的小程序 -was compiled using the resistor network can send software to send D [MCU] C + + to write DTMF points for the waveform of the small programs

单片机课程设计指导，内含各个案例，用c语言，汇编两种方案，极好的课设参考。-SCM curriculum design guidance, including individual cases, with c language, assembly two programs, an excellent class-based reference.