GD32F3x0_Firmware_Library/Examples/CTC/CTC_lxtal/readme.txt

/*!
    \file  readme.txt
    \brief description of the CTC trim internal 48MHz RC oscillator with LXTAL clock
*/

/*
    Copyright (C) 2017 GigaDevice

    2017-06-06, V1.0.0, firmware for GD32F3x0
*/

  This example is based on the GD32350R-EVAL board, it shows CTC is used to trim internal
48MHz RC oscillator with LXTAL clock.

  If the clock trim is OK,led1 will be on.