兆易GD32E230F4单片机使用硬件IIC接口+DMA读写24C04软件例程源码.zip

/*! \file readme.txt \brief description of the tamper with timestamp example \version 2019-02-19, V1.0.0, firmware for GD32E23x */ /* Copyright (c) 2019, GigaDevice Semiconductor Inc. All rights reserved. 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 GD32E230C-EVAL-V1.0 board, it explains how to configure the RTC module. In this demo, RTC peripheral is configured to keep time and generate the tamper interrupt. The RTC clock source can be chose to LXTAL or IRC40K by uncomment the corresponding define in main file. And the HyperTerminal should be connected to the evaluation board via USART0/USART1.The tamper key is the tamper0 pin. The tamper0 is configured to used for timestamp function. After start-up, the program check if the BKP data register is written to a key value. If the value is not correct, the program will ask to set the time value on the HyperTerminal. If the key value is correct, the current time and subsecond will be displayed on the HyperTerminal. The RTC module is in the Backup Domain, and is not reset by the system reset or power reset. When press the tamper key, a tamper0 interrupt will be generated, and the tamper0 event will reset the BKP0 register, thus if you press the reset key, on the HyperTerminal it asks you to set the time again. LED1, LED2 toggles. If LED2 always turn on, there may be other write operations to BKP0 register has occured. In this example it's configured to enable timestamp function when the tamper0 event occurs, thus the timestamp value is then be print on the HyperTerminal to tell the time that tamper0 event occured.