OV5640 Camera Board (A) User Manual
Version: V1.0 Dec.12 2017 1
OV5640 Camera Board (A)
USER MANUAL
OVERVIEW
OV5640 Camera Board (A) is a CMOS camera uses sensor OV5640, takes 5 Megapixel
image in QSXGA mode (2592x1944), uses DVP data interface and SCCB control interface. It
supports RGB565\RGB555\RGB444, YUV (422/420), YCbCr422 and JPEG pixel/image formats.
The module can adjust white balance, saturation, hue, sharpness, and gamma correction. The
resolution and frame rate are adjustable as well.
FEATURES
• Pixels: 5M
• Resolution: 2592x1944
• CCD: OV5640
o uses 1.4 x 1.4 um pixels OmniBSI technology, high sensitivity, low crosstalk and
noise
o supports automatic exposure, white balance, elimination of light stripes, black level
calibration, band pass filter, and so on.
o supports adjustment of saturation, hue, gamma correction, sharpness, and lens
calibration, etc
o supports image zoom, shifting and window settings
• Camera:
o CCD size: 1/4 inches
o Aperture (F): 3.0
o Focal Length: 3.8mm
o View angle (diagonal): 60 degrees
• Output modes:
o YUV (422/420)/YCbCr422
o RGB565/555/444
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o CCIR656
o RAW RGB
o Compressed Data
• Operating voltage: 3.3V
• Control interface: SCCB (compatible with I2C)
• Data interface: DVP 8-bits
• Size: 35.70 mm × 23.90 mm
INTERFACE DESCRIPTION
OV5640 Camera Board (A)
Pin descriptions
3.3V
Power input 3.3V
GND
Ground
SIOC
SCCB clock signal
SIOD
SCCB data signal
VSYNC
Frame synchronization signal
HREF
Line synchronization signal
PCLK
Pixel clock
XCLK
External oscillator clock input (could
connect external crystal oscillator)
D0 ~ D7
Pixel data output
RST
Reset (active low)
PWDN
Save energy mode (high effective)
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SCCB CONTROL INTERFACE
SCCB (Serial Camera Control Bus) is a serial control bus of a camera. SCCB is similar to I2C,
because start and stop signals are same as in I2C, SCCB defines basic data transfer unit (phase),
each phase of data transfer takes one byte. SCCB contains only three kinds of transmission cycle:
1） 3-phase write transmission cycle
3-phase cycle includes: device address, register address, data
2） 2-phase write transmission cycle
2-phase cycle includes: device address, register address
3） 2-phase write transmission cycle
2-phase cycle includes: device address, data
While writing: use 3-phase write cycle directly
While Reading: first use 2-phase write cycle, then use 2-phase read cycle
More detailed information about SCCB protocol see in “OmniVision Technologies Serial Camera
Control Bus (SCCB) Specification”
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DVP DATA INTERFACE
The module OV5640 uses DVP data transfer interface, because camera driver interface
(DCMI) in our STM32F407\429\746 boards only supports DVP. OV5640 sensor has 10-bits DVP
interface, but we usually use 8-bits data processing. For example, in the following picture there
are: OV5640 8 highest bits at the left side connected to 8 bits of STM32F407\429\746 board at
the right site.
DVP interface timing diagram:
DCMI INTERFACE
DCMI (Digital camera media interface) is digital camera interface, integrated into
STM32F4xx, F7xx series of MCU. DCMI is synchronous parallel interface, capable receive 8-, 10-,
12- or 14-bits data stream from CMOS camera module. It can support various data modes:
YCbCr422, RGB565 and compressed data (JPEG).
DCMI interface can support input data stream speed up to 54 MB/s. The interface contains
14 data pins (D13-D0) and pixel clock pin (PIXCLK). The pixel clock polarity can be programmed
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and therefore data can be caught at the rising or falling front. These data come to 32-bit
register (DCMI_DR), and then are transmitted via DMA. The image buffer is controlled by DMA,
not by camera interface. Data received from camera can be restored to original image lines of
frames (YUB/RGB modes) or series of JPEG files. To enable receiving JPEG images the JPEG bit
(the 3rd DCMI_CR bit) must be set to 1. Data stream can be synchronized by HSYNC (horizontal
synchronization) signal and VSYNC (vertical synchronization) signal, otherwise by
synchronization signals embedded into the data stream.
DCMI block diagram:
Top-level block diagram:
The DMA interface active when the CAPTURE bit of DCMI_CR is set to 1. Every time the camera
receive full 32-bits block will trigger a DMI request.
More detailed information about SCCB protocol see in datasheet
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USA GE DESCRIPTION
This module provides STM32F407\429\746 routines, here are demonstration examples for
Waveshare Open746I-C development board:
1. Connect the module to DCMI port of the development board, connect USB-to-serial
adapter to USART1 serial port on the board and to USB port on computer.
2. Open UartDisplay (camera data receiving software) on your computer, set number of port
and its rate 921600, and the open the port.
3. Download the program into the board, push RESET button and after some initialization
period it shows following data:
4. Push WAKE UP button and the board will start to sent continuously JPEG images via serial
port and UartDisplay will show them
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5. Push middle key of the board’s joystick and OV5640 module will keep image on LCD screen
in RGB565 mode continuously.
Open756I-C+7inch LCD
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Open746I-C+4.3inch LCD
Open407V-C+3.2inch LCD
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