VSYNC GPIO output example.

# This work is licensed under the MIT license.
# Copyright (c) 2013-2023 OpenMV LLC. All rights reserved.
# https://github.com/openmv/openmv/blob/master/LICENSE
#
# VSYNC GPIO output example.
#
# This example shows how to toggle a pin on VSYNC interrupt.

import csi
import time
from pyb import Pin

csi0 = csi.CSI()
csi0.reset()  # Reset and initialize the sensor.
csi0.pixformat(csi.RGB565)  # Set pixel format to RGB565 (or GRAYSCALE)
csi0.framesize(csi.QVGA)  # Set frame size to QVGA (320x240)

# This pin will be toggled on/off on VSYNC rising and falling edges.
led_pin = Pin("LED_BLUE", Pin.OUT_PP, Pin.PULL_NONE)
csi0.vsync_callback(lambda state, led=led_pin: led_pin.value(state))

clock = time.clock()  # Create a clock object to track the FPS.

while True:
    clock.tick()  # Update the FPS clock.
    img = csi0.snapshot()  # Take a picture and return the image.
    print(clock.fps())  # Note: OpenMV Cam runs about half as fast when connected
    # to the IDE. The FPS should increase once disconnected.