/****************************************************************************
*   Copyright: (C)2014 Î人ÁèÔÆǶÈëʽʵÑéÊÒ www.emblinux.com
*      Author: GuoWenxue<guowenxue@gmail.com> QQ: 281143292
* Description: ·Ü¶·STM32v5¿ª·¢°åsystickºÍÑÓʱÏà¹Øº¯Êý£»
* 
*   ChangeLog:
*        °æ±¾ºÅ     ÈÕÆÚ       ×÷Õß      ˵Ã÷
*        V1.0.0  2014.08.25  GuoWenxue   ·¢²¼¸Ã°æ±¾
****************************************************************************/
#include "stm32f10x.h"
#include "stm32v5_systick.h"

static __IO uint32_t s_delay_clocks;

/*
   SysTick_Config½«»á´ÓAHB×ÜÏß»ñȡʱÖÓ£¬¶øAHB×ÜÏßÓëϵͳºËÐÄʱÖÓÒ»ÖÂΪ72MHz.Ëü
	 µÄÊäÈë²ÎÊýΪSystick½«Òª¼ÆʱµÄÂö³åÊý£¬¾­¹ýticks¸öÂö³åºó½«´¥·¢Öжϣ¬Öжϴ¦Àí
	 ³ÌÐòÖн«ÖØм¼Êõ¡£ÓÉ´ËÎÒÃÇ¿ÉÒÔ¼ÆËã³ö¶¨Ê±µÄʱ¼ä£¬ÏÂÃæΪ¼ÆË㹫ʽ£º
	 T=ticks*(1/f)   TΪҪ¶¨Ê±µÄ×Üʱ¼ä; ticksΪSysTick_Config()µÄÊäÈë²ÎÊý;1/f¼´Îª
	 SysTickʹÓõÄʱÖÓÔ´µÄʱÖÓÖÜÆÚ£¬fΪ¸ÃʱÖÓÔ´µÄʱÖÓƵÂÊ£¬Îª72MHz.
	 ÔÚÏÂÃæµÄ³ÌÐòÖÐ, SystemCoreClock¼´ÎªÏµÍ³Ê±ÖÓ(f),ÕâÑù£º 
	  T= (f/CLOCK_SECOND) * (1*f) = 1/CLOCK_SECOND
		ËùÒÔ£¬Èç¹ûÎÒÃÇÐèÒª1ms¶¨Ê±£¬Ö»ÐèÒª½«CLOCK_SECOND¶¨ÒåΪ1000;
		      Èç¹ûÎÒÃÇÐèÒª1us¶¨Ê±£¬Ö»ÐèÒª½«CLOCK_SECOND¶¨ÒåΪ1000000;
*/
void sysclock_init(void)
{
   if (SysTick_Config(SystemCoreClock / CLOCK_CONF_SECOND)) 
	 {
        while(1);
	 }
}

void SysTick_Handler(void)
{
  if (s_delay_clocks != 0x00)
  { 
    s_delay_clocks--;
  }
}

void msleep(__IO uint32_t ms)
{
   s_delay_clocks = ms;
	 
	 while(s_delay_clocks != 0);
}