/****************************************************************************
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* Copyright: (C)2018 Î人ÁèÔÆÎïÍøÖÇ¿ÆʵÑéÊÒ www.iot-yun.com
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* Author: GuoWenxue<guowenxue@gmail.com> QQ: 281143292
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* Description: STM32L151C8T6 CubeMX ¿ª·¢°å systick ÑÓʱº¯Êý¡¢jiffiesʵÏÖº¯Êý
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*
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* ChangeLog:
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* °æ±¾ºÅ ÈÕÆÚ ×÷Õß ËµÃ÷
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* V1.0.0 2018.11.05 GuoWenxue ·¢²¼¸Ã°æ±¾
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****************************************************************************/
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#include "stm32l1xx.h"
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#include "stm32_systick.h"
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static __IO uint32_t s_delay_ms;
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__IO uint32_t jiffies;
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/* ³õʼ»¯Systick, ÿ¸ô 1ms ²úÉúÒ»´ÎÖÐ¶Ï */
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void init_systick(void)
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{
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/* Systick¶¨Ê±Æ÷»áÔÚÆäʱÖÓÊäÈëÿÀ´Ò»¸öʱÖÓÂö³åʱ×Ô¼õ1(¼´Ò»¸öϵͳµÎ´ð)£¬¶ø SystickÊǹÒÔÚAHB×ÜÏßÉϵģ¬
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* Æä×ÜÏßƵÂÊÓëϵͳºËÐÄƵÂÊ(f=72MHz)Ò»ÖÂ. ÕâÑùSystickÉϵÄÒ»¸öµÎ´ðµÄʱ¼äÖÜÆÚ¾ÍÊÇ£º 1/f Ãë
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*
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* ÎÒÃÇ¿ÉÒÔͨ¹ý SysTick_Config()º¯ÊýÀ´ÅäÖÃsystickÿ¾¹ý¶àÉÙ¸öticks²úÉúÒ»´ÎÖжϣ¬ÖжϲúÉúºóÓ²¼þ½«×Ô¶¯ÖØмÓÔز¢ÖØпªÊ¼¼ÇÊý£»
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* ¼ÙÉèticks¸öʱÖÓÂö³åÊÇ 1ms :
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* 1Ãë = f ¸öticks => 1ms = f/1000 = SystemCoreClock/1000
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* => 1us = f/1000000 = SystemCoreClock/1000000
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*/
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if( SysTick_Config( SystemCoreClock/TICKS_PER_MSECOND ) )
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{
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while(1);
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}
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}
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/* SystickÖжϴ¦Àíº¯Êý SysTick_Handler (stm32f10x_it.c) »áµ÷Óøú¯Êý */
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void systick_handler_proc(void)
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{
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jiffies++;
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if (s_delay_ms != 0x00)
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{
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s_delay_ms--;
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}
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}
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/* sleep msºÁÃë */
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void msleep(__IO uint32_t ms)
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{
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s_delay_ms = ms;
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while( s_delay_ms != 0);
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}
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