基于ARM的移動高清連接反向控制傳輸的設計與研究
[Abstract]:Mobile HD Connect Interface (Mobile High-Definition Link, MHL) is an audio and video interface that connects smartphones, mobile video players, cameras and other mobile devices to high-definition televisions, projectors, monitors, and other display devices. The interface first modulates three pairs of minimized differential signal (Transition Minimized Differential Signal, TMDS) in (High Definition Multimedia Interface, HDMI) or (Digital Visual Interface, DVI), which is a high definition multimedia interface. Then we reuse the micro-USB interface that most mobile devices already have, and transfer the audio and video images from the mobile devices to the display devices with large screens, so as to improve the ability of people to share information. Compared with the traditional audio and video interface, the MHL interface has the advantages of less connection pin and faster transmission speed. However, due to the short development time of MHL technology and the immature of many technical schemes, it can only transfer the video and audio images from the mobile device to the display device at present, and can not reverse control the mobile device from the display device. In view of the above problems, this paper will design and study a reverse control transmission system, which includes a MHL interface, a HDMI interface and a human-computer interface. The core processor of the system parses the information from the man-machine interface, then converts the information to the format of the MHL protocol specification, then sends it to the smartphone via the MHL control bus according to the MHL protocol specification. After receiving the command and data of the reverse control transmission system, the smart phone makes corresponding changes, and transmits the changed video and audio image to the display device through the data bus of MHL, so as to realize the reverse control transmission. The design and research of MHL reverse control transmission system includes two parts: hardware and software. The hardware part takes ARM as the control core, including a man-machine interface and a power management unit. The man-machine interface uses the mouse and keyboard system used in people's daily office, which is used for information input. It includes wired and wireless. Cable uses USB interface solution, and wireless is realized by Bluetooth technology. The power management unit is mainly responsible for smart phone charging and power management for the whole system. The software is built on the Linux operating system and is divided into the bottom device driver and the upper application software. The bottom driver directly operates the hardware, is responsible for providing the software interface for the upper application, shields the hardware implementation details, and the upper application is responsible for the protocol analysis and conversion, and the implementation of the power management strategy. It processes the data received from the underlying driver and sends it to the underlying driver. The underlying driver module is mounted on the Linux to schedule the underlying driver according to the information of the upper application. Finally, the reverse control transmission system is tested. The test results show that when the smartphone is connected to the system, the system works normally and charges the mobile phone, if the smartphone is in the state of video playing, Through the control of mouse and keyboard system, it can be in the state of stop, play, fast forward, fast back, etc. When the connection between the smart phone and the reverse control transmission system is disconnected, the system is in the state of low power consumption.
【學位授予單位】:福州大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TP334.7
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