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Controlling image capture
OSCAR Technical Manual V2.4.0
115
Multi-shot
Setting multi-shot and entering a quantity of images in Count_Number in
the 61Ch register enables the camera to record a specified number of images.
The number is indicated in bits 16 to 31. If the camera is put into
ISO_Enable mode (see Chapter ISO_Enable / free-run on page 115), this flag
is ignored and deleted automatically once all the images have been recorded.
If multi-shot mode is activated and the images have not yet all been cap-
tured, it can be cancelled by resetting the flag. The same result can be
achieved by setting the number of images to 0.
Multi-shot can also be combined with the external trigger in order to grab a
certain number of images based on an external trigger. This is especially
helpful in combination with the so-called deferred mode to limit the number
of grabbed images to the FIFO size.
ISO_Enable / free-run
Setting the MSB (bit 0) in the 614h register (ISO_ENA) puts the camera into
ISO_Enable mode or Continuous_Shot (free-run). The camera captures an
infinite series of images. This operation can be quit by deleting the 0 bit.
Asynchronous broadcast
The camera accepts asynchronous broadcasts. This involves asynchronous
write requests that use node number 63 as the target node with no
acknowledge.
This makes it possible for all cameras on a bus to be triggered by software
simultaneously - e.g. by broadcasting a one-shot. All cameras receive the
one-shot command in the same IEEE 1394 bus cycle. This creates uncertainty
for all cameras in the range of 125 µs.
Inter-camera latency is described in Chapter Jitter at start of exposure on
page 116.