Example: Asynchronous Hardware Triggering (Using The Camera Registers); Figure 6.5: Trigger Mode 15 ("Multi-Shot Trigger Mode") - Point Grey Flea3 FL3-U3 Technical Reference Manual

Point Grey Flea3 USB 3.0 Technical Reference
6.4.7

Example: Asynchronous Hardware Triggering (Using the Camera Registers)

The following example illustrates how to synchronize image acquisition to a trigger from an external hardware device
in Trigger Mode 0
Determine the Default External Trigger Pin
One of the camera GPIO pins is configured as the default trigger. To determine which pin is the default input/trigger
pin either:
1. See General Purpose Input/Output; or
2. Get the value of the TRIGGER_MODE register 0x830
current trigger source. For example, if the value represented by the Trigger_Source field is 0, the default
trigger source is GPIO0.
For example:
This indicates that a Trigger Mode is available (bit 0 = 1) but not currently enabled (bit 6 = 0). It also indicates that
GPIO0 is the default trigger pin (bits 8-10 = 0), and the default polarity of the pin is active low (bit 7 = 0), which means
the camera will trigger on the falling edge of a pulse.
Revised 9/27/2012
Copyright ©2011-2012 Point Grey Research Inc.

Figure 6.5: Trigger Mode 15 ("Multi-Shot Trigger Mode")

FL3-U3-32S2 and FL3-U3-88S2 models operating in this trigger mode, if the number of
acquired images is 1, exposure is controlled by the global reset feature of the sensor. This
feature may reduce distortion artifacts typical of rolling shutter sensors. For more
information, see Rolling Shutter Artifacts on page
(page 84).
0x830 = 0x80100000
8 0 1
1000 0000 0001
0-7
128.
(page 90). The Trigger_Source field (bits 8-10) is the
0 0 0 0
0000 0000 0000 0000
8-15 16-23 24-31
6 Image Acquisition
0 Hex
0000 Binary
Bits
86