本代码分发送与接收两个模块，发送模块可以采集stm32F4单片机PA5口的模拟电压，通过nrf24l01发送至另一块单片机，该单片机将接收数据发送到串口。(This code is distributed with receiving two modules, sending module can be analog voltage acquisition stm32F4 microcontroller PA5 mouth, sent via nrf24l01 to another piece

用vhdl语言写的分频器，更改几个参数就可实现任意频率分频。