STM32 peripheral driver---SysTick precise delay-EEWORLD

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Microcontroller: STM32F103

Library functions: V3.5

Description: Use the SysTick in the system kernel file core_cm3.c to achieve 1ms, 1us accurate delay, clock 72MHz, involving the registration of the interrupt service SysTick_Handler.

delay.h

#ifndef __DELAY_H__

#define __DELAY_H__

#include "stm32f10x.h"

extern void DelayMs(__IO uint32_t nTime);

extern void DelayUs(__IO uint32_t nTime);

//this function for systick handler function

extern void TimingDelay_Decrement(void);

#endif

delay.c

#include "delay.h"

static __IO uint32_t TimingDelay;

void DelayMs(__IO uint32_t nTime)

{

if (SysTick_Config(72000))

{

/* Capture error */

while (1);

}

TimingDelay = nTime;

while(TimingDelay != 0);

}

void DelayUs(__IO uint32_t nTime)

{

if (SysTick_Config(72))

{

/* Capture error */

while (1);

}

TimingDelay = nTime;

while(TimingDelay != 0);

}

void TimingDelay_Decrement(void)

{

if (TimingDelay != 0x00)

{

TimingDelay--;

}

Interrupt service stm32f10x_it.c

void SysTick_Handler(void)

{

TimingDelay_Decrement();

}

Keywords：STM32 Reference address：STM32 peripheral driver---SysTick precise delay

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