/****************************************************************************
*   Copyright: (C)2018 Î人ÁèÔÆÎïÍøÖÇ¿ÆʵÑéÊÒ www.iot-yun.com
*      Author: GuoWenxue<guowenxue@gmail.com> QQ: 281143292
* Description: ·Ü¶·STM32v5¿ª·¢°å systick ²Ù×÷º¯Êý½Ó¿Ú
* 
*   ChangeLog:
*        °æ±¾ºÅ     ÈÕÆÚ       ×÷Õß      ˵Ã÷
*        V1.0.0  2018.05.10  GuoWenxue   ·¢²¼¸Ã°æ±¾
****************************************************************************/

#ifndef __STM32V5_SYSTICK_H
#define __STM32V5_SYSTICK_H

#define TICKS_PER_MSECOND  1000     /* ʱÖÓ½ÚÅÄÖжÏΪ1msÒ»´Î */
#define TICKS_PER_USECOND  1000000  /* ʱÖÓ½ÚÅÄÖжÏΪ1usÒ»´Î */

extern __IO uint32_t jiffies;

/*              
 *  These inlines deal with timer wrapping correctly. You are strongly encouraged to use them
 *  1. Because people otherwise forget
 *  2. Because if the timer wrap changes in future you won't have to alter your driver code.
 *              
 * time_after(a,b) returns true if the time a is after time b.
 *              
 * Do this with "<0" and ">=0" to only test the sign of the result. A
 * good compiler would generate better code (and a really good compiler
 * wouldn't care). Gcc is currently neither.
 */
#define time_after(a,b)     ((int32_t)(b) - (int32_t)(a) < 0)
#define time_before(a,b)    time_after(b,a)

#define time_after_eq(a,b)  ((int32_t)(a) - (int32_t)(b) >= 0)
#define time_before_eq(a,b) time_after_eq(b,a)

/* Timeout happened, x should be last jiffies+timeout value */
#define timeout_happened(x) (time_after_eq(jiffies, x))

/*
  ʹÓÃʵÀý´úÂë: ÔÚ100msÄÚ´òÓ¡"#"
	start_time = jiffies;
	while( time_before(jiffies, start_time+100) )
		printf("#");
 */


/* ³õʼ»¯Systick, ÿ¸ô 1ms ²úÉúÒ»´ÎÖÐ¶Ï */
extern void init_systick(void);

/* SystickÖжϴ¦Àíº¯Êý: ÑÓʱʱ¼ä×Ô¼õ ºÍ jiffies ×Ô¼Ó */
extern void systick_irq_proc(void);

/* sleep msºÁÃë */
extern void msleep(__IO uint32_t ms);


#endif