79 lines
1.6 KiB
C
79 lines
1.6 KiB
C
/**
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******************************************************************************
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* @file tim.c
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* @author Jerry
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* @version V2.1
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* @date 19-April-2022
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* @brief tim program body.
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******************************************************************************
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* @attention
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*
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32f10x.h"
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#include "global.h"
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//相对精确的ms延时，不使用中断
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//优化：防止和其他中断冲突，导致卡死
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void delay_ms(uint16_t ms)
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{
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uint16_t i;
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volatile uint32_t tempreg;
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uint32_t timeout; //等待时间
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for(i=0; i<ms; i++)
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{
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SysTick->CTRL |= SysTick_CTRL_CLKSOURCE_Msk;
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SysTick->LOAD = 72000 - 1;
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SysTick->VAL = 0;
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SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
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timeout = 72000;
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do
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{
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tempreg = SysTick->CTRL;
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timeout--;
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if(timeout == 0)
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{
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break; //超时退出
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}
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}
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while( (tempreg & SysTick_CTRL_COUNTFLAG_Msk) ==0);
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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
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SysTick->VAL = 0;
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}
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}
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//相对精确的us延时，不使用中断
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//(没调用过)
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void delay_us(uint16_t us)
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{
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uint16_t i;
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volatile uint32_t tempreg;
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for(i=0; i<us; i++)
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{
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SysTick->CTRL |= SysTick_CTRL_CLKSOURCE_Msk;
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SysTick->LOAD = 72;
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SysTick->VAL = 0;
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SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
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do
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{
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tempreg = SysTick->CTRL;
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}
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while( (tempreg & SysTick_CTRL_COUNTFLAG_Msk) ==0);
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SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
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SysTick->VAL = 0;
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}
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}
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