msg.c

来自「DSP编程」· C语言 代码 · 共 62 行

#ifndef _MSG_H_
#include "MSG.h"
#endif

#define MAX_IMG_FR_CNT	0xffffffff    
#define MIN_IMG_FR_CNT	0x0

INT32U	MsgNumOrder = 0;
INT32U	Img_FR_Cnt = 0;

INT32U	OSMsgNumGet(void)
{
   INT32U cnt;
    OS_ENTER_CRITICAL();
    cnt = MsgNumOrder++;
    OS_EXIT_CRITICAL();
    return (cnt);
}

INT32U	OSImgFRCntGet(void)
{
    INT32U cnt;
    OS_ENTER_CRITICAL();
    cnt = Img_FR_Cnt++;
    OS_EXIT_CRITICAL();
    return (cnt);
}


INT32U MsgCheckSumGet(MSG *pMsg)
{
	INT32U i, *p, tmp;
	p = (INT32U*)pMsg;
	tmp = 0;
	
	for(i=0; i<(sizeof(MSG)/4 -1); i++)
		tmp += *p++;	

	return tmp;
}

RESERVE_IMG 	CheckConsistency(INT32U FrameCntA, INT32U FrameCntB)
{
	if(FrameCntA == FrameCntB )
	{	return RESERVE_ALL;	}
	else if(FrameCntA > FrameCntB)
	{
		if(FrameCntA - FrameCntB > 0xffff)	
		{	return RESERVE_B;}
		else
		{	return RESERVE_A;}
	}
	else
	{
		if(FrameCntB - FrameCntA > 0xffff)	
		{	return RESERVE_A;}
		else
		{	return RESERVE_B;}
	}
}