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- /*!
- \file readme.txt
- \brief description of the FWDGT_key example
- \version 2017-02-10, V1.0.0, firmware for GD32F30x
- \version 2018-10-10, V1.1.0, firmware for GD32F30x
- \version 2018-12-25, V2.0.0, firmware for GD32F30x
- \version 2020-09-30, V2.1.0, firmware for GD32F30x
- */
- /*
- Copyright (c) 2020, 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 demo is based on the GD32307C-EVAL-V1.1 board, it shows how to reload the
- FWDGT counter at regulate period using the EXTI interrupt. The FWDGT timeout
- is set to 1.6s (the timeout may varies due to IRC40K frequency dispersion).
-
- An EXTI is connected to a specific GPIO pin and configured to generate an interrupt
- on its falling edge: when the EXTI Line interrupt is triggered (by pressing the tamper
- key on the board), the corresponding interrupt is served. In the ISR, FWDGT counter is
- reloaded).
- If the EXTI Line interrupt does not occur, the FWDGT counter is not reloaded before
- the FWDGT counter reaches 00h, and the FWDGT reset.
- There are three operation methods as follow:
- 1.After the download is completed and the system is powered on, LED2 flashes once and
- then LED3 starts flashing.
- 2.After the download is completed and the system is powered on, start to press the tamper
- button in quick succession, then LED2 is always on, and stop pressing the tamper button in
- quick succession and LED3 starts to flash.
- 3.After the download is completed and the system is powered on, LED2 flashes once and then
- LED3 starts flashing. At this time, after pressing the tamper button in rapid succession,
- LED3 is always on, and after stopping the rapid and continuous pressing of the tamper button,
- LED3 starts flashing
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