/**
  **************************************************************************
  * @file     readme.txt 
  * @version  v2.0.0
  * @date     2021-11-26
  * @brief    readme
  **************************************************************************
  */

  this demo is based on the at-start board, in this demo, you can select different device on toolbar "select target".
  in this demo, show how to get random number by rtc and uid, and usart1 printf the result.
  through config #define ENABLE_RTC_ASSEED value 0 or 1,to opnen or close rtc as seed for random. 



