/*! \file readme.txt \brief USART synchronous \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, it provides a basic communication between USART0 (Synchronous mode) and SPI0. First, USART0 transmits a series of data to SPI0, then SPI0 transmits a series of data to USART0. Compare the transmitted data and the received data. If the data transmitted from USART0 and received by SPI0 are the same, LED2 and LED4 will be on, otherwise off. If the data transmitted from SPI0 and received by USART0 are the same, LED3 and LED5 will be on, otherwise off. connect SPI0 SCK pin(PA5) TO USART0_CK pin(PA8) connect SPI0 MISO pin(PA6) TO USART0_RX pin(PA10) connect SPI0 MOSI pin(PA7) TO USART0_TX pin(PA9)