84 lines
3.2 KiB
C
84 lines
3.2 KiB
C
/******************** (C) COPYRIGHT 2020 GEEKIMU *******************************
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* File Name : delay.c
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* Current Version : V2.0 & ST 3.5.0
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* Author : zhanli 719901725@qq.com & JustFeng.
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* Date of Issued : 2015.5.15 zhanli : Create
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* Comments : STM32系列延时函数
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********************************************************************************/
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#include <stdint.h>
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#include "delay.h"
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#include "misc.h"
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static uint8_t fac_us = 0; // us延时倍乘数
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static uint16_t fac_ms = 0;
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/**----------------------------------------------------------------------
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* Function : Delay_Init
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* Description : 初始化延时函数（不支持ucos）
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* Author : zhanli&719901725@qq.com
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* Date : 2015/2/13 zhanli
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*---------------------------------------------------------------------**/
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void Delay_Init(void)
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{
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// 选择外部时钟 HCLK/8
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SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
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// 为系统时钟的1/8
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fac_us = SystemCoreClock / 8000000;
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// 非ucos下,代表每个ms需要的systick时钟数
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fac_ms = (uint16_t)fac_us * 1000;
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}
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/**----------------------------------------------------------------------
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* Function : Delay_DeInit
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* Author : zhanli&719901725@qq.com
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* Description : 重新初始化延时函数（不支持ucos）
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* Date : 2015/2/13 zhanli
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*---------------------------------------------------------------------**/
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void Delay_DeInit(void){
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SysTick->CTRL = 0;
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}
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/**----------------------------------------------------------------------
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* Function : Delay_Ms(uint32_t ms)
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* Description : 延时n毫秒，对于延时的取值不能大于1864.SysTick->LOAD为
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24位寄存器,所以,最大延时为:
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nms <= 0xffffff * 8 * 1000 / SYSCLK; SYSCLK单位为Hz,nms单
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位为ms.对应72M条件下最大延时,nms<=1864nms。
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* Author : zhanli&719901725@qq.com
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* Date : 2015/2/13 zhanli
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*---------------------------------------------------------------------**/
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void Delay_Ms(uint32_t ms)
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{
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uint32_t temp;
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SysTick->LOAD =(u32)ms*fac_ms; //时间加载(SysTick->LOAD为24bit)
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SysTick->VAL = 0x00; //清空计数器
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SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //开始倒数
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do
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{
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temp=SysTick->CTRL;
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}
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while(temp&0x01&&!(temp&(1<<16))); //等待时间到达
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SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //关闭计数器
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SysTick->VAL =0X00; //清空计数器
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}
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/**----------------------------------------------------------------------
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* Function : Delay_Us(uint32_t nus)
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* Description : 延时n微秒，对于延时的取值不能大于1864us
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* Author : zhanli&719901725@qq.com
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* Date : 2015/2/13 zhanli
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*---------------------------------------------------------------------**/
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void Delay_Us(uint32_t nus)
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{
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uint32_t temp;
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SysTick->LOAD=nus*fac_us; //时间加载
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SysTick->VAL=0x00; //清空计数器
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SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //开始倒数
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do{
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temp=SysTick->CTRL;
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}
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while(temp&0x01&&!(temp&(1<<16))); //等待时间到达
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SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //关闭计数器
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SysTick->VAL =0x00; //清空计数器
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}
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