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

  this demo is based on the at-start board, in this demo, systick used for 
  delay function. qspi command port operate write in command mode, read in
  xip mode. if qspi test pass, led3 fresh, else led2 fresh. 
  the qspi flash is esmt en25qh128a. 
  - qspi io0   --->   pf8
  - qspi io1   --->   pf9
  - qspi io2   --->   pf7
  - qspi io3   --->   pf6
  - qspi sck   --->   pf10
  - qspi cs    --->   pg6

  for more detailed information. please refer to the application note document AN0088.

