The Image Acquisition System Based On S3c6410 With Adv7180 Design And Implementation

Video technology can record and transmit visual information, is used widely in consumer electronics and video surveillance. Video capture is the premise of signal analysis, compression and network transmission, design high-performance video capture front-end is meaningful. Embedded Linux system has the advantages of open-source, stability and can be cut, ARM has the advantages of high-performance, low cost and low power consumption, the combination of ARM and Linux is used to develop high-performance embedded video capture system.The sensitive and anti-interference CCD camera is widely used in the field of domestic video capture, but most only have analog interface, which objectively need to increase decoder chip to facilitate the subsequent digital processing. USB interface camera is easy to use, but the transmission distance is only about2-5meters without the USB HUB, which is obviously not suitable to be laid in a wide range.The device driver is the bridge between the software and hardware to convert physical device to logical device. Different embedded products need a wide variety of devices, combined with the hardware devices continue to update, the hardware drivers that contact with hardware devices closely must be designed respectively. Device driver which contact with the hardware closely should be developed specifically.Based on above background, hardware circuit of system is designed in which use CCD camera, S3C6410as main chip and the ADV7180as decoder chip, design related software under Linux, a high real-time video capture system is implemented. The main contents and results of the research are as follows.1. Build the development environment of embedded system and transplant embedded Linux system successfully.Study the device driver and discover critical technology in device driver development.2. Design the hardware interface of main function module in the system. According to the S3C6410the CAMERA interface signals, the video capture interface is reasonably connected, via the I2C bus to control the normal operation of the ADV7180video decoder chip, convert the CVBS video signal from CCD camera to YUV422format digital signal, S3C6410collect video data from the ADV7180module by DMA mode.3. According to the operation mode of ADV7180, set its hardware registers value reasonably, design ADV7180device driver based on I2C driver architecture and load as a module.Design the top video capture program based on V4L2video capture driver, complete high-speed video capture and real-time display.