嵌入式机载视频输出接口设计

Design of Embedded Airborne Video Output Interface

针对视频接口接收视频格式单一的问题,设计了一种多格式视频输入接口的视频编码模块。由于采用CH7024视频编码芯片,所以在接口即可接收RGB565和RGB666格式的视频信号。在Linux环境下,对芯片寄存器和视频格式进行配置,编译芯片驱动程序,通过超级终端下载到芯片中,通过CH7024编码芯片将不同格式的输入信号统一转换成CVBS视频的信号输出,这样可减少电路的硬件设计,并通过对软件的修改来接收不同视频格式的信号。实验结果表明,设计的模块能够适应多种视频格式的信号,且编码后的CVBS视频信号输出距离远,抗干扰性强。

Aiming at the problem of video interface receiving single video format, a video encoding module with multi-format video input interface was disigned. As adopting the CH7024 video encoding chips, the input interface can receive the RGB565 and RGB666 video signals from the processor in different formats, configure the chip registers arid video format,com- pile chip driver in Linux environment, and then load the driver to the chip by the hyperterminal. The input signals of different formats can be converted into CVBS video signal output through the CH7024 encoder chip, so as to reduce the circuit design of hardware, and modify the software program to receive different formats of video. The results show that the designed modules can adapt to a variety of video formats signals and the encoded CVBS video signal can output large range distance, which also has a strong anti-interference performance.