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

  this demo is based on the ht32f49395_sk board, in this demo, using on-board
  en25qh128a as spim flash, the program will erase, write and read one sector.
  if the test is passed, the three leds will toggle.
  the pins connection as follow:
  - spim sck ---> pb1
  - spim cs  ---> pa8
  - spim io0 ---> pb10
  - spim io1 ---> pb11
  - spim io2 ---> pb7
  - spim io3 ---> pb6
 
  note: the max Internal ahb clock frequency is 180MHz when SPIM used. for more detailed
        information. please refer to the Datasheet document.

  note: the supported external flash types need to be configured with register flash_select. 
        for more detailed  information. please refer to the Reference Manual document.
