generated from hulk/gd32e23x_template_cmake_vscode
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167
Src/systick.c
167
Src/systick.c
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/*!
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\file systick.c
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\brief the systick configuration file
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\version 2025-02-10, V2.4.0, demo for GD32E23x
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*/
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/*
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Copyright (c) 2025, GigaDevice Semiconductor Inc.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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OF SUCH DAMAGE.
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*/
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/**
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* ************************************************************************
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*
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* @file systick.c
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* @author GD32
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* @brief 通过 SysTick 定时器进行微秒级别和毫秒级别的延时函数
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*
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* ************************************************************************
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* @copyright Copyright (c) 2024 GD32
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* ************************************************************************
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*/
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#include "gd32e23x.h"
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#include "systick.h"
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volatile static uint32_t delay;
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volatile static uint32_t delay_count = 0;
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/*!
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\brief configure systick
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\param[in] none
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\param[out] none
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\retval none
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*/
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/**
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* ************************************************************************
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* @brief 配置 SysTick 定时器
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*
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*
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* ************************************************************************
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*/
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void systick_config(void)
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{
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/* setup systick timer for 1000Hz interrupts */
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if (SysTick_Config(SystemCoreClock / 1000U)){
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/* capture error */
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while (1){
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}
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}
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/* configure the systick handler priority */
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//设置了 SysTick 定时器的时钟源为 HCLK
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systick_clksource_set(SYSTICK_CLKSOURCE_HCLK);
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// 配置SysTick为1ms周期中断
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// 注意：SysTick_Config会自动设置时钟源为HCLK，所以需要使用SystemCoreClock/1000
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SysTick_Config(SystemCoreClock / 1000U); // 1ms中断
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NVIC_SetPriority(SysTick_IRQn, 0x00U);
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}
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/*!
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\brief delay a time in milliseconds
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\param[in] count: count in milliseconds
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\param[out] none
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\retval none
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*/
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/**
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* ************************************************************************
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* @brief delay_ms 毫秒延时函数
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*
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* @param[in] count 毫秒值
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*
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* ************************************************************************
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*/
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void delay_10us(uint32_t count)
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{
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// 基于系统时钟的简单循环延时
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// 这是一个粗略的估计，实际延时可能有偏差 实测10.2us
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uint32_t loops_per_10us = SystemCoreClock / 1700000; // 粗略估计，每10微秒的循环次数
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for(uint32_t i = 0; i < count; i++) {
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for(volatile uint32_t j = 0; j < loops_per_10us; j++);
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}
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}
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/**
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* ************************************************************************
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* @brief delay_ms 毫秒延时函数
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*
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* @param[in] count 毫秒值
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*
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* ************************************************************************
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*/
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void delay_ms(uint32_t count)
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{
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delay = count;
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while(0U != delay){
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}
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delay_count = count; // 设置延时计数
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while (delay_count != 0U);
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}
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/*!
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\brief delay decrement
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\param[in] none
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\param[out] none
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\retval none
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*/
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/**
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* ************************************************************************
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* @brief 每个 SysTick 中断调用时，减少延时计数
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*
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* @param[in] void
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*
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* ************************************************************************
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*/
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void delay_decrement(void)
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{
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if (0U != delay){
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delay--;
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if (delay_count != 0U)
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{
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delay_count--;
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}
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}
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// /**
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// * ************************************************************************
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// * @brief delay_ms_safe 毫秒延时函数（不干扰SysTick中断）
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// * @details 使用简单循环实现延时，不会重新配置SysTick
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// * @param[in] count 毫秒值
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// * ************************************************************************
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// */
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// void delay_ms_safe(uint32_t count)
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// {
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// // 基于系统时钟的简单循环延时
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// // 这是一个粗略的估计，实际延时可能有偏差
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// uint32_t loops_per_ms = SystemCoreClock / 14000; // 粗略估计
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// for(uint32_t i = 0; i < count; i++) {
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// for(volatile uint32_t j = 0; j < loops_per_ms; j++);
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// }
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// }
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// /**
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// * ************************************************************************
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// * @brief delay_us_safe 微秒延时函数（不干扰SysTick中断）
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// * @details 使用简单循环实现延时，不会重新配置SysTick
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// * @param[in] count 微秒值
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// * ************************************************************************
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// */
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// void delay_us_safe(uint32_t count)
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// {
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// // 基于系统时钟的简单循环延时
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// // 这是一个粗略的估计，实际延时可能有偏差
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// uint32_t loops_per_us = SystemCoreClock / 22000000; // 粗略估计，每微秒的循环次数
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// for(uint32_t i = 0; i < count; i++) {
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// for(volatile uint32_t j = 0; j < loops_per_us; j++);
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// }
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// }
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