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

  this demo is based on the ht32f49041_sk board, in this demo, provides a short
  description of how to use the swd ios as standard gpios or mux other peripheral.
  the pa13(swdio) as general io output push-pull toggled, pa14(swclk) as usart2
  tx send data.

