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152
Src/systick.c
152
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 float count_1us = 0;
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volatile static float count_1ms = 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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NVIC_SetPriority(SysTick_IRQn, 0x00U);
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//设置了 SysTick 定时器的时钟源为 HCLK/8
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systick_clksource_set(SYSTICK_CLKSOURCE_HCLK_DIV8);
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//计算了每微秒所需的 SysTick 计数值
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count_1us = (float)SystemCoreClock/8000000;
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//计算了每毫秒所需的 SysTick 计数值
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count_1ms = (float)count_1us * 1000;
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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_us 微秒延时函数
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*
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* @param[in] count 微秒值
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*
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* ************************************************************************
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*/
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void delay_us(uint32_t count)
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{
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uint32_t ctl;
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//设置 SysTick 计数器的装载值
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SysTick->LOAD = (uint32_t)(count * count_1us);
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//清零 SysTick 计数器，以确保计数器从零开始计数
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SysTick->VAL = 0x0000U;
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//使能 SysTick 定时器，开始进行计数
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SysTick->CTRL = SysTick_CTRL_ENABLE_Msk;
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//等待 SysTick 计数器的计数值达到装载值时退出
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do
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{
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ctl = SysTick->CTRL; //读取 CTRL 寄存器的值
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}while((ctl & SysTick_CTRL_ENABLE_Msk)&&!(ctl & SysTick_CTRL_COUNTFLAG_Msk));
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//循环退出，禁用 SysTick 定时器
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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
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//将 SysTick 计数器的当前值清零，以便下次使用
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SysTick->VAL = 0x0000U;
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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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uint32_t ctl;
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while(0U != delay){
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}
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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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void delay_decrement(void)
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{
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if (0U != delay){
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delay--;
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}
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}
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//设置 SysTick 计数器的装载值
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SysTick->LOAD = (uint32_t)(count * count_1ms);
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//清零 SysTick 计数器，以确保计数器从零开始计数
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SysTick->VAL = 0x0000U;
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//使能 SysTick 定时器，开始进行计数
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SysTick->CTRL = SysTick_CTRL_ENABLE_Msk;
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//等待 SysTick 计数器的计数值达到装载值时退出
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do
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{
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ctl = SysTick->CTRL; //读取 CTRL 寄存器的值
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}while((ctl&SysTick_CTRL_ENABLE_Msk)&&!(ctl & SysTick_CTRL_COUNTFLAG_Msk));
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//循环退出，禁用 SysTick 定时器
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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
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//将 SysTick 计数器的当前值清零，以便下次使用
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SysTick->VAL = 0x0000U;
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}
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