基于OMAP-L138平台SPI总线的嵌入式应用  

Embedded application of SPI bus based on OMAP-L138 platform

作　　者：于淼[1] 郑楠[1] 崔洋[1] 李佩玥[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室超精密光学工程研究中心,长春130033

出　　处：《国外电子测量技术》2015年第11期71-75,共5页Foreign Electronic Measurement Technology

基　　金：国家重大科技专项02专题(2009ZX02205)项目

摘　　要：数据的采集和控制是嵌入式应用领域的重点课题,随着数字转模拟器件精度的扩展和转换速率的提升,需要更加高效的运算平台和方法。PCM1702是一款高达20位分辨率的精密数字模拟转换器,其还具备超低失真、低噪声和快速电流输出等特性。SPI总线接口是嵌入式Linux系统中的典型应用,在高性能达芬奇平台OMAP-L138处理器ARM+DSP双核环境下,通过GPIO实现SPI总线驱动,在高精度DA芯片PCM1702控制中得到应用。实验结果表明该驱动实现方法高效、稳定,具备针对精密器件的高速处理能力。Data acquisition and control is the key issue for embedded applications.With the expansion of the precision and the promotion of the conversion speed used in the digital to analog devices,we need more efficient computing platforms and methods.The PCM1702 is a precision 20-bit digital-to-analog converter.It also features a very low noise,ultra-low distortion and fast settling current output.SPI bus interface is the typical application of embedded Linux system.In this paper,SPI bus driver is achieved through the general purpose I/O pins based on DSP and ARM dual core processor on high-performance DaVinci OMAP-L138 platform,which is applied in high-precision DA chip PCM1702.The experimental results show that the method is efficient and stable,which is aimed at the high processing capacity of precision components.

关 键 词：OMAP-L138 SPI PCM1702 嵌入式LINUX 驱动 

分 类 号：TN721.1[电子电信—电路与系统]