GD32时钟配置代码学习工程

/*! \file readme.txt \brief description of the RCU_Clock_Out example \version 2017-06-28, V1.0.0, demo for GD32F3x0 \version 2019-06-01, V2.0.0, demo for GD32F3x0 \version 2021-05-31, V2.1.0, demo for GD32F3x0 \version 2022-03-06, V2.2.0, demo for GD32F3x0 */ /* Copyright (c) 2022, 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 GD32350R-EVAL-V1.0 board, it shows how to use RCU clock out function. When program is running, user could press the user key to select different clock output mode. Demo has seven clock output mode. Once the key is pressed, the next mode will be selected and corresponding led will light. Debug information can be printed from COM1 by using USART0. The clock output pins are configured PA8. The JP13 should be jumped to USART.