/****************************************************************************
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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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#ifndef __STM32_SYSTICK_H_
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#define __STM32_SYSTICK_H_
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#define TICKS_PER_MSECOND 1000 /* ʱÖÓ½ÚÅÄÖжÏΪ1msÒ»´Î */
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#define TICKS_PER_USECOND 1000000 /* ʱÖÓ½ÚÅÄÖжÏΪ1usÒ»´Î */
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extern __IO uint32_t jiffies;
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/*
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* These inlines deal with timer wrapping correctly. You are strongly encouraged to use them
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* 1. Because people otherwise forget
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* 2. Because if the timer wrap changes in future you won't have to alter your driver code.
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*
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* time_after(a,b) returns true if the time a is after time b.
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*
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* Do this with "<0" and ">=0" to only test the sign of the result. A
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* good compiler would generate better code (and a really good compiler
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* wouldn't care). Gcc is currently neither.
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*/
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#define time_after(a,b) ((int32_t)(b) - (int32_t)(a) < 0)
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#define time_before(a,b) time_after(b,a)
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#define time_after_eq(a,b) ((int32_t)(a) - (int32_t)(b) >= 0)
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#define time_before_eq(a,b) time_after_eq(b,a)
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/* Timeout happened, x should be last jiffies+timeout value */
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#define timeout_happened(x) (time_after_eq(jiffies, x))
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/*
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ʹÓÃʵÀý´úÂë: ÔÚ100msÄÚ´òÓ¡"#"
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start_time = jiffies;
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while( time_before(jiffies, start_time+100) )
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printf("#");
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*/
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/* ³õʼ»¯Systick, ÿ¸ô 1ms ²úÉúÒ»´ÎÖÐ¶Ï */
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extern void init_systick(void);
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/* SystickÖжϴ¦Àíº¯Êý: ÑÓʱʱ¼ä×Ô¼õ ºÍ jiffies ×Ô¼Ó */
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extern void systick_handler_proc(void);
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/* sleep msºÁÃë */
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extern void msleep(__IO uint32_t ms);
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#endif
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