Use STM32Cube_FW_F4_V1.16.0 as the HAL driver.
This is an test project of OV7670 with AL422B on the STM32F412g-disco board.
connection is:
OV7670      STM32F412g-disco
SCL PB8
SDA PB9
D7-D0       PC7-PC0
/WRST PB11
/RRST PA13
RCK PB5
WR PG10
Vsync PB7
/OE        GND
PWDN GND(if exists)
/RST not connected(better reset before using)
Addition, use a rubber band to bind all the control signal wires together, otherwise it may interfere
the data lines which would cause the wrong image displayed.