嵌入式汽车行驶记录仪的设计

Design of Embedded Vehicle Traveling Data Recorder

汽车行驶记录仪是对车辆行驶速度、时间、里程以及车辆行驶等相关状态信息进行记录、存储并可与其他设备进行通信的数字式电子记录装置.本文基于高效软硬件来构建能够满足更实用需求的汽车行驶记录仪.系统主控采用低功耗、高性能且集成ARM Cortex-M3内核的32位微处理器,其片上资源十分丰富、外围接口电路简单可靠,同时搭配主流外围电路模块,包括展现良好人机交互界面的TFT真彩触摸显示屏、GPS定位模块、测量行驶车速的传感器等;软件编程使用丰富的软件函数库以及能够高效管理多任务且免费开源的实时操作系统(RTOS) CooCox CoOS.

Vehicle traveling data recorder ,commonly known as car black box ,was a digital electronic device for recording vehicle speed ,time ,mileage and vehicle status information related to record ,store and commu-nicate with other devices .In this paper ,we make use of hardware and software to build an efficient and prac-tical vehicle traveling data recorder to meet higher demand .The main core of the system is low-power ,high-performance integrated ARM Cortex-M3 32-bit microprocessor core ,of which on-chip resources are very rich . Peripheral interface circuit was simple and reliable ,while the peripheral circuit module with the mainstream including interactive interface to display well by the TFT color touch screen ,GPS positioning module ,mea-suring driving speed sensors ,etc .Software programming used extensive software library and free open-source real-time operating system （RTOS） CooCox CoOS to efficiently manage multiple tasks .