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介绍基于CH374的USB摄像头驱动的设计与实现方法。采用支持USBHOST主机方式的USB总线接口芯片CH374,给出S3C44B0下CH374驱动USB摄像头SPCA561A的硬件电路和软件实现,包括视频数据的采集和后续处理方案。利用CH374支持同步传输的特点,在基于ARM7的平台上给出一种低成本的视频数据采集方案。
This paper introduces the design and implementation of USB camera driver based on CH374. The hardware circuit and software of CH374 driven USB camera SPCA561A under S3C44B0 are given with the USB bus interface chip CH374 supporting USBHOST host mode, including the collection and subsequent processing of video data. Using CH374 to support synchronous transmission, a low-cost video data acquisition scheme is given on the ARM7-based platform.