MCCD Observation Software details

• Close shutter
• Initialize GPIB (camera)
• Move scanner to initial position (center - (#frames/2) * #scanner steps between frames)
• Convert desired Latitude and Longitude to encoder steps (requires that suncenter be done first)
• Move coude to these positions
• reset system time
• set up fits header
• initialize camera format
• refresh the screen display
• initialize tapes if necessary
• fitstr
• initialize fg to use channel 0
• arm IRQ7
• Loop:
• if not first time in loop, wait for the camera to be ready
• rearm irq7
• call exploop:
• make sure the scanner is at the initial position
• for first scan: write EOF and fits header on tapes
• Loop for #frames:
• on first frame: simple expose command and snap a picture with the frame grabber, start writing it to tape.
• on subsequent frames: send readout-expose command to camera, set up the camera tape-write and stuff the time of the last exposure into the camera buffer, wait for readout-expose to finish, and start writing the tape.
• read current time and save it
• open shutter
• wait exposure time
• close shutter
• step the scanner
• wait for previous tape write to finish
• write out the last frame to tape
• display the last frame on the monitor
• update screen display
• see if we got an IRQ7 interrupt, if so, quit.
• see if we did the requested #scans, if so, quit
• open the shutter
• move the scanner to the center
• various cleanup with the camera, display, etc.