STM32外设驱动---SysTick精准延时

来源：互联网发布：手机手写输入软件编辑：程序博客网时间：2024/05/18 03:58

单片机：STM32F103
库函数：V3.5
描述：利用系统内核文件core_cm3.c内部SysTick实现1ms，1us的精准延时，时钟72MHz，涉及中断服务SysTick_Handler的注册。

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 functionextern  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--;  }}

中断服务stm32f10x_it.c

void SysTick_Handler(void){    TimingDelay_Decrement();}

1 0