Manual Inspecta Software

2.4.6.3 mfg_sync ()
mfg_sync () is the processing part of the MVFG interrupt service routine. The interrupt service
routine just calls mfg_sync, reenables the interrupt and returns from interrupt.
mfg_sync does everything that has to be done when a VSYNC is encountered:
- looking for the odd field of an interlaced video.
- check for new camera & mode selection and the A/D converter levels within a sequence.
- flip frame-memory if the flag _fgtv_valid == 0
- call the application progrmme if mvfg_IntCallback is activated.
Software
mfg_sync must be called every HSYNC ( if this is the source of the interrupt ) or every VSYNC. If
an application programme has ist own service routine for the MVFG interrupt, mfg_sync has to be
called first.
mfg_sync checks & changes the following counters & pointers:
dword int_cnt increments with every interrupt.
dword frm_cnt increments mod frame_nr with every full-frame if rotating recording
is selected ( req_frm = -1 ), shows otherwise the actual image
position in frame-memory.
dword odd_flag =1 if the just recorded field was an odd field.
dword frm_beg offset within frame-memry points to the first pixel of the just
recorded frame.
dword _fgtv_valid =1 if frame-memory was just flipped.
dword integ_count counter for integration time mod full-frames.
dword integration requested number of full-frames to integrate.
dword stop_start =1 if recording is not stopped.
INSPECTA Software Rev. 1.47 Page 57