com2process.c

单片机通讯程序,从单片机SAT设备中获得设备状态.

#define COM2_GLOBALS
#include "Macro.h"
#include "Main.h"

#define M_DELAY 	100
#define A_DELAY 	40

void Port2Process(void)
{
struct Serial_rcv xdata *Com;
static unsigned char xdata tmpBuff[256];
static unsigned int xdata RcvingTimer;
static unsigned char xdata sndCnt;
static unsigned char xdata hwInit = 0;
static unsigned char xdata CmdPtr;

unsigned int xdata iTmp;
unsigned char cTmp;
unsigned char xdata *mPtr;
	if (!hwInit) {
		mPtr = tmpBuff;
		for ( iTmp=0; iTmp<sizeof(tmpBuff); iTmp++ ) *(mPtr++) =0;
		Port2Data[0] = 0;
		Port2Data[1] = 0;
		CmdPtr = 1;
		hwInit = 1;
	}
	if (Port2Timer > 36000) Port2Timer = 36000;
	if ( (Port2Data[0] != 0) || (Port2Data[1] != 0) ) return;
	Com = Rcv + 2;
	while  ( Com->Tail != Com->Head ) {
		cTmp = Com->Data[Com->Head++];
		Com->Head = Com->Head % sizeof(Com->Data);
		Com->Buff[Com->pos++] = cTmp;
		Com->pos = Com->pos % sizeof(Com->Buff);
        RcvingTimer = Port2Timer;     
        sndCnt = 0;
		continue;
	}
    if ( (Port2Timer - RcvingTimer) > 10 ) {   // 10 * 100ms
    	// receive data is over
        Port2Data[0] = Com->pos % 256;
        Port2Data[1] = (Com->pos / 256) & 0xff;
        memcpy(&Port2Data[2], Com->Buff, Com->pos);
		Com->pos = 0;
    }
	if ( (Port2Data[0] != 0) || (Port2Data[1] != 0) ) return;
// 
	if (Port2Timer > A_DELAY) {       //  * 100ms
		if (CmdPtr == 0) {
			if (Port2Timer < M_DELAY) return;
		}
		Port2Timer = 0;
        sndCnt++;
		if (Port2Cmd[0]==0) return;
		CmdPtr = CmdPtr % Port2Cmd[0];
        if ( sndCnt == 1) {
			CmdPtr += 1;
			CmdPtr = CmdPtr % Port2Cmd[0];
		}
		iTmp = CmdPtr * LENCMD + 1;
		if (Port2Cmd[iTmp]==0) return;
		Send_To_Port_Buffer(2, &Port2Cmd[iTmp + 1], Port2Cmd[iTmp]);
		SendStart(2);
        Com->pos = 0;
        return;
	}
}