在网上找的程序,自带的,据说应该就是原子哥写的,复制过来注释文字都看不到了。。能看的懂吗?
#include "delay.h"
#include "sys.h"
#if SYSTEM_SUPPORT_UCOS
#include "includes.h" //ucos ʹÓÃ
#endif
void SysTick_Handler(void)
{
OSIntEnter(); //½øÈëÖжÏ
OSTimeTick(); //µ÷ÓÃucosµÄʱÖÓ·þÎñ³ÌÐò
OSIntExit(); //´¥·¢ÈÎÎñÇл»ÈíÖжÏ
}
#endif
//³õʼ»¯ÑÓ³Ùº¯Êý
//µ±Ê¹ÓÃucosµÄʱºò,´Ëº¯Êý»á³õʼ»¯ucosµÄʱÖÓ½ÚÅÄ
//SYSTICKµÄʱÖӹ̶¨ÎªHCLKʱÖÓµÄ1/8
//SYSCLK:ϵͳʱÖÓ
void delay_init()
{
#ifdef OS_CRITICAL_METHOD //Èç¹ûOS_CRITICAL_METHOD¶¨ÒåÁË,˵Ã÷ʹÓÃucosIIÁË.
u32 reload;
#endif
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8); //Ñ¡ÔñÍⲿʱÖÓ HCLK/8
fac_us=SystemCoreClock/8000000; //ΪϵͳʱÖÓµÄ1/8
#ifdef OS_CRITICAL_METHOD //Èç¹ûOS_CRITICAL_METHOD¶¨ÒåÁË,˵Ã÷ʹÓÃucosIIÁË.
reload=SystemCoreClock/8000000; //ÿÃëÖӵļÆÊý´ÎÊý µ¥Î»ÎªK
reload*=1000000/OS_TICKS_PER_SEC;//¸ù¾ÝOS_TICKS_PER_SECÉ趨Òç³öʱ¼ä
//reloadΪ24λ¼Ä´æÆ÷,×î´óÖµ:16777216,ÔÚ72MÏÂ,Ô¼ºÏ1.86s×óÓÒ
fac_ms=1000/OS_TICKS_PER_SEC;//´ú±íucos¿ÉÒÔÑÓʱµÄ×îÉÙµ¥Î»
SysTick->CTRL|=SysTick_CTRL_TICKINT_Msk; //¿ªÆôSYSTICKÖжÏ
SysTick->LOAD=reload; //ÿ1/OS_TICKS_PER_SECÃëÖжÏÒ»´Î
SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk; //¿ªÆôSYSTICK
#else
fac_ms=(u16)fac_us*1000;//·ÇucosÏÂ,´ú±íÿ¸ömsÐèÒªµÄsystickʱÖÓÊý
#endif
}
#ifdef OS_CRITICAL_METHOD //ʹÓÃÁËucos
//ÑÓʱnus
//nusΪҪÑÓʱµÄusÊý.
void delay_us(u32 nus)
{
u32 ticks;
u32 told,tnow,tcnt=0;
u32 reload=SysTick->LOAD; //LOADµÄÖµ
ticks=nus*fac_us; //ÐèÒªµÄ½ÚÅÄÊý
tcnt=0;
told=SysTick->VAL; //¸Õ½øÈëʱµÄ¼ÆÊýÆ÷Öµ
while(1)
{
tnow=SysTick->VAL;
if(tnow!=told)
{
if(tnow<told)tcnt+=told-tnow;//ÕâÀï×¢ÒâÒ»ÏÂSYSTICKÊÇÒ»¸öµÝ¼õµÄ¼ÆÊýÆ÷¾Í¿ÉÒÔÁË.
else tcnt+=reload-tnow+told;
told=tnow;
if(tcnt>=ticks)break;//ʱ¼ä³¬¹ý/µÈÓÚÒªÑÓ³ÙµÄʱ¼ä,ÔòÍ˳ö.
}
};
}
//ÑÓʱnms
//nms:ÒªÑÓʱµÄmsÊý
void delay_ms(u16 nms)
{
if(OSRunning==TRUE)//Èç¹ûosÒѾÔÚÅÜÁË
{
if(nms>=fac_ms)//ÑÓʱµÄʱ¼ä´óÓÚucosµÄ×îÉÙʱ¼äÖÜÆÚ
{
OSTimeDly(nms/fac_ms);//ucosÑÓʱ
}
nms%=fac_ms; //ucosÒѾÎÞ·¨ÌṩÕâôСµÄÑÓʱÁË,²ÉÓÃÆÕͨ·½Ê½ÑÓʱ
}
delay_us((u32)(nms*1000)); //ÆÕͨ·½Ê½ÑÓʱ,´ËʱucosÎÞ·¨Æô¶¯µ÷¶È.
}
#else//²»ÓÃucosʱ
//ÑÓʱnus
//nusΪҪÑÓʱµÄusÊý.
void delay_us(u32 nus)
{
u32 temp;
SysTick->LOAD=nus*fac_us; //ʱ¼ä¼ÓÔØ
SysTick->VAL=0x00; //Çå¿Õ¼ÆÊýÆ÷
SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //¿ªÊ¼µ¹Êý
do
{
temp=SysTick->CTRL;
}
while(temp&0x01&&!(temp&(1<<16)));//µÈ´ýʱ¼äµ½´ï
SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //¹Ø±Õ¼ÆÊýÆ÷
SysTick->VAL =0X00; //Çå¿Õ¼ÆÊýÆ÷
}
//ÑÓʱnms
//×¢ÒânmsµÄ·¶Î§
//SysTick->LOADΪ24λ¼Ä´æÆ÷,ËùÒÔ,×î´óÑÓʱΪ:
//nms<=0xffffff*8*1000/SYSCLK
//SYSCLKµ¥Î»ÎªHz,nmsµ¥Î»Îªms
//¶Ô72MÌõ¼þÏÂ,nms<=1864
void delay_ms(u16 nms)
{
u32 temp;
SysTick->LOAD=(u32)nms*fac_ms;//ʱ¼ä¼ÓÔØ(SysTick->LOADΪ24bit)
SysTick->VAL =0x00; //Çå¿Õ¼ÆÊýÆ÷
SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //¿ªÊ¼µ¹Êý
do
{
temp=SysTick->CTRL;
}
while(temp&0x01&&!(temp&(1<<16)));//µÈ´ýʱ¼äµ½´ï
SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //¹Ø±Õ¼ÆÊýÆ÷
SysTick->VAL =0X00; //Çå¿Õ¼ÆÊýÆ÷
}
#endif
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