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SCAILX-2GS234 Sync and Trigger Configuration

SCAILX-2GS234 Sync and Trigger Configuration

python function vdlg_ap1302 sync_trigger can be used to configure most sync/trigger configuration options. This is supplemental information for raw I2C commands which can accomplish the same result as documented in the 2GS234 data-sheet.

Setting up the sync (PWM) output signal on connector P200

 

  1. Set the duty cycle to 0.1 to 0.5
    Write 0x3FFF to register 0X60 for a duty cycle of 0.25

  2. Set the Sync frequency.

  3. Register 0x64 value is (1000_000/fps) * 256
    25fps = 0x9C4000
    30fps = 0x823500
    50fps = 0x4E2000
    60fps = 0x411AAB

  4. Enable the Sync signal
    Write 0x0F to register 0x68

Note: Be aware that the maximum exposure time may need to be adjusted. If the exposure time exceeds the set sync frequency, then the exposure time will overrule the framerate set by the sync signal.

 

Python example

gsi2c.i2c = I2C("/dev/links/csi0_i2c") # set csi0_i2c gsi2c.write32(0x64, round(256 * 1000_000 / 60)) # set fps to 60Hz gsi2c.write16(0x60, 0x3FFF) # set duty cycle to 0.25 gsi2c.write8(0x68, 0x07) # enable sync (pwm)

Configuring the Trigger input signal.

 

# Write 0x302 to register 0x58

This will:

  • Output a frame when sync signal is detected.

  • Sync at the start of a frame.

  • Reset the uptime every frame.

  • Reset the frame counter at every frame

 Python example

gsi2c.i2c = I2C("/dev/links/csi0_i2c") # set csi0_i2c gsi2c.write16(0x58, 0x302) # wait for trigger on csi0 gsi2c.i2c = I2C("/dev/links/csi1_i2c") # set csi1_i2c gsi2c.write16(0x58, 0x302) # wait for trigger on csi1