/*!
    \file    readme.txt
    \brief   description of the low voltage detector demo

    \version 2026-02-02, V2.4.0, firmware for GD32L23x, add support for GD32L235
*/

/*
    Copyright (c) 2026, GigaDevice Semiconductor Inc.

    Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice, this 
       list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright notice, 
       this list of conditions and the following disclaimer in the documentation 
       and/or other materials provided with the distribution.
    3. Neither the name of the copyright holder nor the names of its contributors 
       may be used to endorse or promote products derived from this software without 
       specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
OF SUCH DAMAGE.
*/

  This example is based on the GD32L233R-EVAL-V1.1/GD32L235R-EVAL-V1.0 board, it shows how to use 
low voltage detector. If VDD/VDDA is higher or lower than the LVD threshold, then a lvd event will 
occur. The event is internally connected to the EXTI line 16 and can generate an interrupt if enabled 
through the EXTI registers. When the macro PB7_ANALOG_INPUT is 1, the input voltage of PB7 is compared 
with 0.8v, if the input voltage is higher or lower than 0.8v, LED1 will toggle. When the macro 
PB7_ANALOG_INPUT is 0, use external power connect 3.3v pin and GND pin of the board, adjust voltage 
higher or lower than the LVD threshold 3.0v, LED1 will toggle.

