基于OMAP-L138平台SPI总线的嵌入式应用
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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.
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.
引文
[1]Texas Instruments.OMAP-L138 DSP+ARM processor technical reference manual(Rev.A)[EB/OL].(20l1-11),http://www.ti.com.cn/cn/lit/ug/spruh77a/spruh77a.pdf.
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[5]王卫民,赵天环,曹思源.基于ARM9的高解析喷码机系统设计与实现[J].电子测量技术,2013,36(1):70-74.
[6]邢艳芳,张延冬.基于Zynq的OLED驱动设计[J].液晶与显示,2014,29(2):224-228.
[7]杨立身,张安伟,王磊,等.基于STM32的μC/GUI外置spiflas字库研究与实现[J].液晶与显示,2015,30(2):290-295.
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[10]怯肇乾,陈永超.ARM-Linux下SPI设备的添加与驱动实现[J].单片机与嵌入式系统应用,2012,12(4):80-81.
[11]李彦,李锵.基于嵌入式Linux系统的双网卡大数据传输[J].电子测量与仪器学报,2014,28(9):1027-1032.
[12]黄帅,程良伦.基于OMAP-L138平台多通道手持频谱分析仪研究[J].电子设计工程,2014,22(11):130-133.
[13]徐立松,李佩玥,葛川,等.高精度D/A电路的设计与实现[J].国外电子测量技术,2014,33(12):21-25.
[2]宋执环,杜往泽,李斌,等.基于图像检测的除尘风机嵌入式控制系统[J].仪器仪表学报,2014,35(5):1192-1200.
[3]付兴武,张军,王洋.基于SPI总线协议的字符设备驱动程序[J].计算机系统应用,2013,22(2):146-150.
[4]杨斌,满峰,姜秀杰,等.基于ARM-Linux和单片机的数据通信系统设计[J].电子设计工程,2013,21(12):126-129.
[5]王卫民,赵天环,曹思源.基于ARM9的高解析喷码机系统设计与实现[J].电子测量技术,2013,36(1):70-74.
[6]邢艳芳,张延冬.基于Zynq的OLED驱动设计[J].液晶与显示,2014,29(2):224-228.
[7]杨立身,张安伟,王磊,等.基于STM32的μC/GUI外置spiflas字库研究与实现[J].液晶与显示,2015,30(2):290-295.
[8]BiCMOS Advanced Sign Magnitude 20-Bit DIGITALTO-ANALOG CONVERTER.http://www.ti.com.cn/cn/lit/ds/symlink/pcm1702.pdf.
[9]周静雷,贾保军,张宏艳.基于以太网的声频数据实时传输[J].电子测量技术,2011,34(5):107-110.
[10]怯肇乾,陈永超.ARM-Linux下SPI设备的添加与驱动实现[J].单片机与嵌入式系统应用,2012,12(4):80-81.
[11]李彦,李锵.基于嵌入式Linux系统的双网卡大数据传输[J].电子测量与仪器学报,2014,28(9):1027-1032.
[12]黄帅,程良伦.基于OMAP-L138平台多通道手持频谱分析仪研究[J].电子设计工程,2014,22(11):130-133.
[13]徐立松,李佩玥,葛川,等.高精度D/A电路的设计与实现[J].国外电子测量技术,2014,33(12):21-25.