上传的是一个简易频率计程序，用avr单片机，在没有倍频的前提下最大可以测量65k的信号，可以测量脉宽，周期，传上来交流一下。-Upload a simple frequency meter program, avr microcontroller, the multiplier under the premise can be measured 65k signal can be measured pulse width, period, Chuan-up exchange.