How To Disable Video Playback And Capture Module (Exit); How To Start Video Capture - DIGITAL-LOGIC MICROSPACE PCC-P5 Technical User's Manual

DIGITAL-LOGIC AG
PCCP5 Manual V2.3

4.11.3 How to disable video playback and capture module (Exit)

1. Restore XRD0.
2. Restore SAR04.
UCHAR XR_Index;
XR_Index = ReadPortUshort(ulXrAddr); // Save XR Index
WritePortUshort(ulXrAddr,XRD0); // Restore XRD0
WritePortUshort(ulXrAddr,0x044e); // Read SAR04
WritePortUshortAddr,SAR04); // Restore SAR04
WritePortUchar(ulXrAddr,XR_Index); // Restore XR_Index

4.11.4 How to start video capture

// In 55x VGAs, capture counters are not updated with the new off-screen
// address until the next Input Video VSync. So, the first frame of the input
// video is captured at the old address left in the counters when we froze
// the video. This may cause the memory corruption. To avoid this problem we
// need to ignore the data of the first input video frame. We already set the
// acquisition window to NULL during initialization. Now all we have to do is to
// wait for the first couple of input Vsyncs then set the acquisition rectangle
// to proper values. Acquisition rectangle must not be set till video started
// flowing in (bVideoFlowingIn = 1). bVideoFlowingIn flag is set to 0 at
// initialization time.
// So let us perform the first frame ritual.
//
if(!bVideoFlowingIn)
{ // This is first time to start 550 video, see if video is flowing?
start_time = timeGetTime(); // 1 millisec precision
while(((timeGetTime() - start_time) < 200))
{ // wait for 200 milisec (33.3 ms for 30Hz video) and VSyncActivity
WritePortUchar(ulMrAddr, MR_VIN_CTRL_4);
if(ReadPortUshort(ulMrAddr) & (VIC4_VSYNC << 8))
{
bVideoFlowingIn = 1; // video start flowing
//
// Wait for Input VSync is over.
//
start_time = timeGetTime(); // 1 millisec precision
WritePortUchar(ulMrAddr, MR_VIN_CTRL_4);
while((ReadPortUshort(ulMrAddr) & (VIC4_VSYNC << 8)) &&
((timeGetTime() - start_time) < 200));
//
// Now wait for next VSync.
//
start_time = timeGetTime(); // 1 millisec precision
WritePortUchar(ulMrAddr, MR_VIN_CTRL_4);
while(!(ReadPortUshort(ulMrAddr) & (VIC4_VSYNC << 8)) &&
((timeGetTime() - start_time) < 200));
//
// Restore crop.right
//
SetCropRect((LPRECTL)&rCrop);
break;
}
}
} // FirstTime VideoFlowingIn
mr03 |= (VIC2_START_GRAB << 8); // unfreeze the video (start capturing)
WritePortUshort(ulMrAddr,mr03); // write new value
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