mirror of
https://github.com/WeActStudio/ArduinoCore-AT32F4.git
synced 2026-05-21 09:22:01 +00:00
122 lines
3.0 KiB
C
122 lines
3.0 KiB
C
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/*
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* MIT License
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* Copyright (c) 2017 - 2022 _VIFEXTech
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "delay.h"
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#ifndef SYSTICK_TICK_FREQ
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# define SYSTICK_TICK_FREQ 1000 // Hz
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#endif
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#define SYSTICK_TICK_INTERVAL (1000 / SYSTICK_TICK_FREQ)
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#define SYSTICK_LOAD_VALUE (system_core_clock / SYSTICK_TICK_FREQ)
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#define SYSTICK_MILLIS (SystemTickCount * SYSTICK_TICK_INTERVAL)
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static volatile uint32_t SystemTickCount = 0;
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/**
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* @brief 系统滴答定时器初始化，定时1ms
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* @param 无
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* @retval 无
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*/
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void Delay_Init(void)
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{
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system_core_clock_update();
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SysTick_Config(SYSTICK_LOAD_VALUE);
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NVIC_SetPriority(SysTick_IRQn, SYSTICK_PRIORITY);
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}
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/**
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* @brief 系统滴答定时器中断入口
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* @param 无
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* @retval 无
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*/
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void SysTick_Handler(void)
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{
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SystemTickCount++;
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}
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/**
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* @brief 获取单片机自上电以来经过的毫秒数
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* @param 无
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* @retval 当前系统时钟毫秒数
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*/
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uint32_t millis(void)
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{
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return SYSTICK_MILLIS;
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}
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/**
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* @brief 获取单片机自上电以来经过的微秒数
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* @param 无
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* @retval 当前系统时钟微秒数
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*/
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uint32_t micros(void)
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{
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return (SYSTICK_MILLIS * 1000 + (SYSTICK_LOAD_VALUE - SysTick->VAL) / CYCLES_PER_MICROSECOND);
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}
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/**
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* @brief 毫秒级延时
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* @param ms: 要延时的毫秒数
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* @retval 无
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*/
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void delay_ms(uint32_t ms)
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{
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uint32_t tickstart = SystemTickCount;
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uint32_t wait = ms / SYSTICK_TICK_INTERVAL;
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while((SystemTickCount - tickstart) < wait)
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{
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}
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}
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/**
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* @brief 微秒级延时
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* @param us: 要延时的微秒数
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* @retval 无
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*/
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void delay_us(uint32_t us)
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{
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uint32_t total = 0;
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uint32_t target = CYCLES_PER_MICROSECOND * us;
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int last = SysTick->VAL;
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int now = last;
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int diff = 0;
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start:
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now = SysTick->VAL;
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diff = last - now;
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if(diff > 0)
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{
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total += diff;
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}
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else
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{
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total += diff + SYSTICK_LOAD_VALUE;
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}
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if(total > target)
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{
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return;
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}
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last = now;
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goto start;
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}
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