/*!
    \file    readme.txt
    \brief   description of the GTOC0_closing_request_from_comparator

    \version 2026-03-04, V1.0.0, firmware for GD32M53x
*/

/*
    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 GD32M531R-EVAL-V1.2 board, it provides a
description of closing GPTIMER channel pwm output.

  The frequency of GPTIMER0 is fixed to 180MHz, GPTIMER0 period is 12000.

The two duty cycles are computed as the following description:
    GPTIMER0_CH0 duty cycle = ((2000+6000)/ 24000)* 100 = 66.7%
    GPTIMER0_CH1 duty cycle = ((4000+8000)/ 24000)* 100 = 50%

  CMP0 is configured as following:
  - Inverting input is internally connected to DAC0_OUT0.
  - Non Inverting input is connected to PC0.
  - Output is internally connected to GTOC.
  DAC is configured as following:
  - Data 12-bit right alligned.
  - Software trigger DAC0_OUT0.
  - DAC0_OUT0 is internally connected to CMP.
  - DAC0_OUT0 output about 1.2V (Vrefp = 3.3V).

  when CMP0 output rising edge, an output closing request is generated.Then, the PWM output of GPTIMER0 is closed.

  After system start-up, connect Wakeup key (PA0) and PC4 with Dupont line. Press the key, LED2 is turn on,
the variations of the wave can be observed through the oscilloscope.
