Trigger 393

Description

10389 board is required.

Use cases:

• Trigger a single camera from external source
• Synchronize multiple cameras to a master camera or external trigger source
• Program frame rate

The conditions of the trigger can be generated either internally or externally:

• for external triggering a 103891 board and a 4-conductor 2.5mm audio plug with cable (example: digikey) is required.
• for internal triggering use J4-J6 connectors with a 4-pin flex cable.

To program trigger go to: http://192.168.0.9/parsedit.php => External Trigger Controls

NOTE: Be careful with changing parameters when TRIG=4. Camera drivers are driven by the frame sync interrupts from the sensor, so if the sensor is not triggered - everything can get stuck. The Program Ahead value sets the number of frame sync interrupts the camera will wait wait for until a parameter is reprogrammed.

External Trigger Controls page

Parameters

parameter	description
TRIG	Trigger mode. 0x0 - free running, 0x4 - triggered by external signal or FPGA timing generator, 0x14 - triggered in GRR mode
TRIG_MASTER	Master sensor_port (0..3) for triggering setup, other ports will have settings duplicated
TRIG_CONDITION	FPGA trigger sequencer trigger condition, 0 - internal, else dibits: 00 - do not use, 01 - keep, 10 - active low, 11 - active high for each GPIO[9:0] pin). 10389 board inverts signals, so 0x80000 - input from external connector, 0x08000 - input from internal flex cable (as in Eyesis)
TRIG_DELAY	FPGA trigger sequencer trigger delay, 32 bits in pixel clocks (100MHz or 10ns)
TRIG_OUT	FPGA trigger sequencer trigger output to GPIO, dibits: 00 - do not use, 01 - keep, 10 - active low GPIO output, 11 - active high GPIO output. 10389 board inverts signals, so 0x02000 - output to external connector (active high), 0x20000 - output to internal flex connector
TRIG_PERIOD	FPGA trigger sequencer output sync period (32 bits, in pixel clocks (100MHz or 10ns)). 0- stop. 1 - single, >=256 repetitive with specified period
TRIG_BITLENGTH	Bit length minus 1 (in pixel clock cycles) when transmitting/receiving timestamps, without timestamps the output pulse width is 8*(TRIG_BITLENGTH+1). Legal values 2..255
EXTERN_TIMESTAMP	When 1 camera will use external timestamp (received over inter-camera synchronization cable) if it is available (no action when external syncronization is not connected), when 0 - local timestamp will be used
XMIT_TIMESTAMP	Specify output signal sent through internal/external connector (defined by TRIG_OUT). 0 - transmit just sync pulse (8*(TRIG_BITLENGTH+1) pixel clock periods long), 1 - pulse+timestamp 64*(TRIG_BITLENGTH+1) pixel clock periods long

Examples

Internal periodic trigger (10 fps, from fpga generator)

• http://192.168.0.9/parsedit.php?sensor_port=0&immediate&TRIG_CONDITION=0&TRIG_PERIOD=10000000&TRIG=4

Internal periodic trigger (4 fps, from fpga generator) + output the signal to external port

• http://192.168.0.9/parsedit.php?sensor_port=0&immediate&TRIG_CONDITION=0&TRIG_OUT=0x66555&TRIG_PERIOD=25000000&TRIG=4

External trigger receive

• http://192.168.0.9/parsedit.php?sensor_port=0&immediate&TRIG_CONDITION=0x95555&TRIG_OUT=0x66555&TRIG_PERIOD=100000000&TRIG=4
• at the same time the fpga generator outputs a 1 fps signal - if the sync cable wires are properly connected the camera can be triggered from this 'external' signal

Recover from missing external trigger signal to internal trigger

• http://192.168.0.9/parsedit.php?sensor_port=0&immediate&TRIG_CONDITION=0*-2
  • *-2 - apply value parameter in the current frame (if not specified, the default is 3)

Manual triggering from PC

Enable

http://192.168.0.9:2323/trig/pointers

• TRIG=4 should be set in advance
• The command automatically sets a single-shot trigger mode with TRIG_PERIOD=0x1, but it writes the register directly into the FPGA,

not updating the TRIG_PERIOD in the PHP interface:

http://192.168.0.9/parsedit.php?TRIG&TRIG_CONDITION&TRIG_DELAY&TRIG_OUT&TRIG_PERIOD&TRIG_BITLENGTH&EXTERN_TIMESTAMP&XMIT_TIMESTAMP&refresh

Trigger/Refresh

http://192.168.0.9:8081/trig/pointers

Check status

http://192.168.0.9/parsedit.php?immediate&TRIG&TRIG_PERIOD&SENS_AVAIL&FRAME

Disable

Update the TRIG_PERIOD in the current frame

• http://192.168.0.9/parsedit.php?sensor_port=0&immediate&TRIG_PERIOD=10000000*-2

Update the TRIG_PERIOD from the user interface

• http://192.168.0.9/parsedit.php?TRIG&TRIG_CONDITION&TRIG_DELAY&TRIG_OUT&TRIG_PERIOD&TRIG_BITLENGTH&EXTERN_TIMESTAMP&XMIT_TIMESTAMP&refresh
• Refresh until the changes are applied (with Program Ahead = 3 it's 3 times):

http://192.168.0.9:8081/trig/pointers

Links

• 10389 extension board
• 103891 adapter board for external trigger connection

10389 trigger testing

external connector

In this test the camera triggers itself via audio cable. For cable wiring see 103891.

• To test:

- connect a sensor to port 0
- http://192.168.0.9/parsedit.php?sensor_port=0&immediate&TRIG_CONDITION=0&TRIG_OUT=0x66555&TRIG_PERIOD=25000000&TRIG=4
visual: LED is blinking
software: frame counter is running

• It's easy to modify the cable to trigger itself and other multiple cameras.

internal connectors

In this test the camera triggers itself via 4-pin flex cable.

• Connect as displayed on the pictures below.
  • J4 - trigger output (master port)
  • J5-J6 - trigger input (slave ports)
• To test:

- connect a sensor to port 0
- http://192.168.0.9/parsedit.php?sensor_port=0&immediate&TRIG_CONDITION=0x8000&TRIG_OUT=0x66555&TRIG_PERIOD=25000000&TRIG=4
software: frame counter is running

• To sync multiple camera, example:

cable 1: camera1 (J4) -> camera2 (J6)
cable 2: camera2 (J5) -> camera3 (J6)
cable 3: camera3 (J5) -> camera4 (J6)
etc.