/**
  *************************************************************************************************************
  * @file     readme.txt
  * @brief    readme
  **************************************************************************
  */

  this demo is based on the ht32f49041_sk board, in this demo, provides a basic
  communication between usart2 and usart1 using  polling capability. if received
  data right, the three leds will blink.

  set-up
  - connect usart2 tx pin (pa2) to usart1 rx pin (pb7)
  - connect usart2 rx pin (pa3) to usart1 tx pin (pb6)

