64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
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/***********************************************************************!
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* 技术讨论：QQ群 123763203
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* 官网 ：www.navota.com
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*
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* @file delay.c
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* @brief systic函数库
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* @author Navota
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* @date 2018-3-1
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************************************************************************/
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#include "delay.h"
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//延时驱动C 文件
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/***********************************************************************************************
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功能：初始化延时模块
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形参：0
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返回：0
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详解：此函数用于初始化延时模块,使用函数时必须调用。否则会造成延时函数出错
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************************************************************************************************/
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void DelayInit(void)
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{
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SysTick->CTRL = 0;//选取systick的时钟为内核时钟/16
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}
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/***********************************************************************************************
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功能：US级延时函数
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形参：US 需要延时多少US
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返回：0
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详解：裸机下的延时US
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************************************************************************************************/
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void DelayUs(uint32_t us)
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{
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uint32_t temp;
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SysTick->LOAD = (us*BUS_CLK_HZ/10000)/(1600); //时间加载
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SysTick->VAL = 0x00; //清空计数器
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SysTick->CTRL |= 0x01 ; //开始倒数
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do
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{
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temp = SysTick->CTRL;
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}while(temp & 0x01 && !(temp & (1<<16))); //等待时间到达
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SysTick->CTRL &= ~0x01; //关闭计数器
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}
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/***********************************************************************************************
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功能：MS级延时函数
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形参：MS需要延时多少MS
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返回：0
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详解：裸机下的延时MS
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************************************************************************************************/
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void DelayMs(uint32_t ms)
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{
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uint32_t temp;
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uint16_t i;
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for(i = 0;i < ms;i++) //延时 MS
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{
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SysTick->LOAD = (BUS_CLK_HZ/1000)/16; //时间加载1ms
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SysTick->VAL = 0x00; //清空计数器
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SysTick->CTRL |= 0x01; //开始倒数
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do
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{
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temp = SysTick->CTRL;
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}while(temp & 0x01 && !(temp & (1<<16))); //等待时间到达
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SysTick->CTRL &= ~0x01; //关闭计数器
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}
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}
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