/****************************************************************************
*   Copyright: (C)2018 Î人ÁèÔÆÎïÍøÖÇ¿ÆʵÑéÊÒ www.iot-yun.com
*      Author: GuoWenxue<guowenxue@gmail.com> QQ: 281143292
* Description: STM32L151C8T6 CubeMX ¿ª·¢°å systick ÑÓʱº¯Êý¡¢jiffiesʵÏÖº¯Êý
*
*   ChangeLog:
*        °æ±¾ºÅ     ÈÕÆÚ       ×÷Õß      ˵Ã÷
*        V1.0.0  2018.11.05  GuoWenxue   ·¢²¼¸Ã°æ±¾
****************************************************************************/

#include "stm32l1xx.h"
#include "stm32_systick.h"

static __IO uint32_t s_delay_ms;
__IO uint32_t jiffies;


/* ³õʼ»¯Systick, ÿ¸ô 1ms ²úÉúÒ»´ÎÖÐ¶Ï */
void init_systick(void)
{
	/* Systick¶¨Ê±Æ÷»áÔÚÆäʱÖÓÊäÈëÿÀ´Ò»¸öʱÖÓÂö³åʱ×Ô¼õ1(¼´Ò»¸öϵͳµÎ´ð)£¬¶ø SystickÊǹÒÔÚAHB×ÜÏßÉϵģ¬
	 * Æä×ÜÏßƵÂÊÓëϵͳºËÐÄƵÂÊ(f=72MHz)Ò»ÖÂ. ÕâÑùSystickÉϵÄÒ»¸öµÎ´ðµÄʱ¼äÖÜÆÚ¾ÍÊÇ£º 1/f Ãë
	 * 
	 * ÎÒÃÇ¿ÉÒÔͨ¹ý SysTick_Config()º¯ÊýÀ´ÅäÖÃsystickÿ¾­¹ý¶àÉÙ¸öticks²úÉúÒ»´ÎÖжϣ¬ÖжϲúÉúºóÓ²¼þ½«×Ô¶¯ÖØмÓÔز¢ÖØпªÊ¼¼ÇÊý£»
	 * ¼ÙÉèticks¸öʱÖÓÂö³åÊÇ 1ms :
	 * 1Ãë = f ¸öticks  => 1ms = f/1000 = SystemCoreClock/1000
	 *                    => 1us = f/1000000 = SystemCoreClock/1000000 
	 */
   if( SysTick_Config( SystemCoreClock/TICKS_PER_MSECOND ) ) 
	 {
        while(1);
	 }
}

/* SystickÖжϴ¦Àíº¯Êý SysTick_Handler (stm32f10x_it.c) »áµ÷Óøú¯Êý */
void systick_handler_proc(void)
{
  jiffies++;
  if (s_delay_ms != 0x00)
  { 
    s_delay_ms--;
  }
}


/* sleep msºÁÃë */
void msleep(__IO uint32_t ms)
{
   s_delay_ms = ms;
	 
	 while( s_delay_ms != 0);
}