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

  this demo is based on the ht32f49041_sk board, in this demo, shows how to use
  the tmr peripheral to measure the frequency of an external signal.
  the minimum frequency value to measure is 3.66 khz(240m/65536).
  set-up
  - connect the external signal to measure to the tim3 ch2 pin (pa7).

