基于FreeRTOS的嵌入式视频矩阵系统设计与实现  

DESIGN AND IMPLEMENTATION OF EMBEDDED VIDEO MATRIX SYSTEM BASED ON FREERTOS

作　　者：李佳翔 范文兵[1] 张真真 Li Jiaxiang;Fan Wenbing;Zhang Zhenzhen(School of Information Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China)

机构地区：[1]郑州大学信息工程学院,河南郑州450001

出　　处：《计算机应用与软件》2023年第2期164-169,235,共7页Computer Applications and Software

基　　金：河南省科技攻关项目(192102210086)。

摘　　要：由于高清接口(HDMI)显示屏的普及率越来越高,为了满足对多通道视频快速切换的需要,研究一类HDMI视频传输标准及数据格式,设计一种基于FreeRTOS的多通道HDMI视频快速切换矩阵的软件和硬件系统。该系统的下位机部分由微控制器(MCU)模块,TMDS切换模块,HDMI接口模块三部分组成,编写切换控制程序和底层驱动程序。上位机软件通过串口或TCP/IP发送指令到下位机,实时操作系统多线程接收并解析指令,MCU通过IIC总线控制切换芯片做出相应操作。实验测试表明,与国内同类系统相比,该系统具有多通道HDMI视频切换速度快、延迟小、无失真特点,可用于高清视频监控场合。High-definition multimedia interface(HDMI) display is increasingly popular. To meet the need for fast switching of multi-channel video, a kind of HDMI video transmission standard and data format is studied, and a software and hardware system for multi-channel HDMI video fast switching matrix based on FreeRTOS is designed. The lower computer was divided into three parts: micro controller unit(MCU), TMDS switching module, HDMI interface module. The switch control driver and the low-layer driver were written. The upper computer software sent instructions to the lower computer through UART or TCP/IP, the RTOS received and analyzed the instructions through multithreading, and MCU controlled the switching chip through the IIC bus to make corresponding operations. The experimental tests show that compared with similar domestic systems, it has the characteristics of high multi-channel HDMI video switching speed, low delay, and no distortion. It can be used in high-definition video surveillance.

关 键 词：视频矩阵 高清晰度多媒体接口 嵌入式系统 最小差分信号 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]