【STM32+HAL】微秒级延时函数汇总

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一、调用Arduino中的micros函数

1、micros.c

#include "micros.h"__STATIC_INLINE uint32_t GXT_SYSTICK_IsActiveCounterFlag(void)
{return ((SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) == (SysTick_CTRL_COUNTFLAG_Msk));
}static uint32_t getCurrentMicros(void)
{/* Ensure COUNTFLAG is reset by reading SysTick control and status register */GXT_SYSTICK_IsActiveCounterFlag();uint32_t m = HAL_GetTick();const uint32_t tms = SysTick->LOAD + 1;__IO uint32_t u = tms - SysTick->VAL;if (GXT_SYSTICK_IsActiveCounterFlag()) {m = HAL_GetTick();u = tms - SysTick->VAL;}return (m * 1000 + (u * 1000) / tms);
}//获取系统时间，单位us
uint32_t micros(void)
{return getCurrentMicros();
}//微秒级延时函数
void Delay_us(uint16_t nus)
{int temp = micros();while(micros() - temp < nus){}
}

2、micros.h

#ifndef __MICROS_H__
#define __MICROS_H__#include "stm32f4xx_hal.h"uint32_t micros(void);
void Delay_us(uint16_t nus);#endif

3、测试结果

波形较不稳定，周期准确度较高

 

 

二、定时器中断延时函数

1、HAL库开启定时器

已知TIM1挂载在APB2总线上

配置参数值 

2、延时函数

/*** @brief  定时器延时us，Prescaler -> 168-1* @param  us: <= 65535* @retval None*/void Delay_us(uint16_t nus)
{__HAL_TIM_SetCounter(&htim1,0);__HAL_TIM_ENABLE(&htim1);while (__HAL_TIM_GET_COUNTER(&htim1) < nus){}__HAL_TIM_DISABLE(&htim1);
}

3、测试结果

波形较稳定，周期稳定地偏长0.3-0.4us

 

 

 

三、纯代码1

1、Delay_us.c

__IO float usDelayBase;void PY_usDelayTest(void)
{__IO uint32_t firstms, secondms;__IO uint32_t counter = 0;firstms = HAL_GetTick()+1;secondms = firstms+1;while(uwTick!=firstms) ;while(uwTick!=secondms) counter++;usDelayBase = ((float)counter)/1000;
}void PY_Delay_us_t(uint32_t Delay)
{__IO uint32_t delayReg;__IO uint32_t usNum = (uint32_t)(Delay*usDelayBase);delayReg = 0;while(delayReg!=usNum) delayReg++;
}void PY_usDelayOptimize(void)
{__IO uint32_t firstms, secondms;__IO float coe = 1.0;firstms = HAL_GetTick();PY_Delay_us_t(1000000) ;secondms = HAL_GetTick();coe = ((float)1000)/(secondms-firstms);usDelayBase = coe*usDelayBase;
}void Delay_us(uint16_t nus)
{__IO uint32_t delayReg;__IO uint32_t msNum = nus/1000;__IO uint32_t usNum = (uint32_t)((nus%1000)*usDelayBase);if(msNum>0) HAL_Delay(msNum);delayReg = 0;while(delayReg!=usNum) delayReg++;
}

2、测试结果

波形较稳定，周期稳定地偏长0.3-0.4us

四、纯代码2

1、Delay_us.c

#define CPU_FREQUENCY_MHZ    168        //STM32主频void Delay_us(__IO uint32_t delay)
{int last, curr, val;int temp;while (delay != 0){temp = delay > 900 ? 900 : delay;last = SysTick->VAL;curr = last - CPU_FREQUENCY_MHZ * temp;if (curr >= 0){do{val = SysTick->VAL;}while ((val < last) && (val >= curr));}else{curr += CPU_FREQUENCY_MHZ * 1000;do{val = SysTick->VAL;}while ((val <= last) || (val > curr));}delay -= temp;}
}

 

 2、测试结果

波形较稳定，偏差稳定0.5us

 

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