/******************************************************************************
 * Copyright (C) 2014-2015 HangZhou SiZhu Co.,LTD.
 *
 *-----------------------------------------------------------------------------
 * File: 			    Delay.c
 * Description:		time delay: delay_us & delay_ms
 * Author:			  Lishoujian (867693272@qq.com)
 * Date:			    Jan 8, 2015
 *****************************************************************************/

/* ----------------------- Platform includes --------------------------------*/

#include "delay.h"
#include "sys.h"
////////////////////////////////////////////////////////////////////////////////// 	 
 	 
static u8  fac_us=0;//usÑÓʱ±¶³ËÊý
static u16 fac_ms=0;//msÑÓʱ±¶³ËÊý



//³õʼ»¯ÑÓ³Ùº¯Êý
//SYSTICKµÄʱÖӹ̶¨ÎªHCLKʱÖÓµÄ1/8
//SYSCLK:ϵͳʱÖÓ
void Delay_init()	 
{
//	SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);	//Ñ¡ÔñÍⲿʱÖÓ  HCLK/8
	SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);	//Ñ¡ÔñÍⲿʱÖÓ  HCLK/8
	fac_us=12*SystemCoreClock/HSE_VALUE;	//ΪϵͳʱÖÓµÄ1/8  
	fac_ms=(u16)fac_us*1000;//ÿ¸ömsÐèÒªµÄsystickʱÖÓÊý   
}								    



//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÷	  	    
}