摘要
针对无人机遥测数据中将多路数据分离出来的应用问题,提出了以嵌入式系统的SPI接口来分离其中视频数据的设计方案,设计中选用飞思卡尔公司的i.MX27处理器,通过分析i.MX27串行SPI接口的特点,详细介绍了对相关寄存器的配置方法以及对接口的软件设计过程,采用DMA方式完成主从机视频数据的传输;设计中数据以16位的宽度进行传输,速率为系统时钟32.768kHz进行4分频后作为传输速率;该方法为工程中视频数据传输量大、速度高的应用问题提供了解决方案,同时对i.MX27处理器其他外围接口的开发和应用有一定的借鉴意义。
In order to isolate the remote sensing multi--channel data transmitted by UAV, an embedded system based on SPI interface is put forward. The design chooses Freescale＇ s i. MX27 processor. By analyzing the characteristics of i. MX27＇ s SPI interface, introduce a method to configure relate registers and the design process of software in details. Using DMA method to achieve the transmission of the video data. The data transferred are 16 bits＇ wide, and the data rate is one quarter of the system clock, which is 32. 768 KHz. The method solved the problem of transmitting video data in large quantities and high speed in practical engineering. Meanwhile it also has certain reference value for the development and application of i, MX27＇ s other peripheral interface.
出处
《计算机测量与控制》
CSCD
北大核心
2011年第2期442-444,489,共4页
Computer Measurement &Control
