50 lines
2.4 KiB
Plaintext
50 lines
2.4 KiB
Plaintext
/*!
|
|
\file readme.txt
|
|
\brief description of the TIMER1 single pulse demo for gd32w51x
|
|
|
|
\version 2021-10-30, V1.0.0, firmware for GD32W51x
|
|
*/
|
|
|
|
/*
|
|
Copyright (c) 2021, 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 GD32W515P-EVAL-V1.0 board, it shows how to configure
|
|
the TIMER1 peripheral in single pulse mode.
|
|
The external signal is connected to TIMER1 CH0 pin (PA0) and the falling
|
|
edge is used as active edge.
|
|
|
|
The single pulse signal is output on TIMER1 CH1 pin (PA1).
|
|
|
|
The TIMER1CLK frequency is set to systemcoreclock,the prescaler is 90,so the
|
|
TIMER1 counter clock is 2MHz.
|
|
|
|
single pulse value = (TIMER1_period - TIMER1_pulse) / TIMER1 counter clock
|
|
= (65535 - 11535) / 2MHz = 27 ms.
|
|
|
|
Connect the TIMER1 CH0 pin (PA0)to KEY2(PC13),When KEY_TAMPER is pressed,
|
|
a single pulse is generated. |