ICP DAS USA PCI-1202 Series, User Manual

Page: 74 / 123

PCI-1202/1602/180x Series Card
Multi-Function Boards
User Manual/ Ver. 4.8/ Mar. 2015/ PMH-0014-48/ Page: 74
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The source code of the middle-trigger function (Windows version) is given as follows:
P180x_StartScanPostTrg(…) is designed for PCI-1800/1802 series
P1202_StartScanPostTrg(…) is designed for PEX-1202 and PCI-1202 series
P1602_StartScanPostTrg(…) is designed for PCI-1602 series
WORD CALLBACK P180X_StartScanMiddleTrg (WORD wSampleRateDiv, DWORD dwNum, SHORT
nPriority)
{
disable_timer0();
// disable internal pacer timer
disable_timer1(); // disable external pacer timer
wVal=pic_control(0xD400);
/* 11?1 01?? ???? ???? cmd_101=start scan */
if (wVal!=0) return(wVal);
_outpw(wAddrCtrl,0xf000);
// 1. disable all external trigger
enable_timer1(wSampleRateDiv); // 2. Sampling rate=8M/dwSampleRateDiv
_outpw(wAddrCtrl,0x6800); // 3. B15=0,S2=0,S1=1,S0=0 --> clr FIFO
_outpw(wAddrCtrl,0xE800); // 3. B15=1,S2=0,S1=1,S0=0 --> enable timer-1
_outpw(wAddrCtrl,0xFC00); // 4. S2=1; S1=1; S0=1 --> wait ext signal
// create magicscan thread
InitializeCriticalSection(&MagicScan_CS);
wThreadStatus=0; wPreMid=1; wAskThreadStop=0;
// middle-trigger
hThread=CreateThread(NULL,0,(LPTHREAD_START_ROUTINE,
magic_scan_pre_mid_trg, NULL, 0,&dwThreadID);
SetThreadPriority(hThread,nPriority);
// can not use HI/LO alarm & digital filter
i=0;
for(;;)
{
EnterCriticalSection(&MagicScan_CS);
j=wThreadStatus;
LeaveCriticalSection(&MagicScan_CS);
if (j!=0) break;
i++; Sleep(1);
if (i>1000) return(ThreadCreateError);
}
return(NoError);
}