基于PCI-E总线的北斗导航授时卡Linux驱动设计  

Design and Implementation of Driver of Beidou Navigation Timing Card under Linux PCI-E

作　　者：王军[1,2] 韩力[1] 杜博军 王磊[1] 何昕[2] 

机构地区：[1]苏州科技学院,江苏苏州215009 [2]中国科学院长春光学精密机械与物理研究所,长春130033 [3]中国白城兵器实验中心,吉林白城137001

出　　处：《计算机测量与控制》2016年第4期115-117,共3页Computer Measurement &Control

摘　　要：为提高Linux系统时间的精确度,设计了PCI-Express接口的北斗授时卡以及驱动程序;授时卡通过北斗卫星导航信息接收模块接收时间定位信息并输出至FPGA(Field-Programmable Gate Array,现场可编程门阵列),FPGA利用状态机检测出时间位置信息,并存入IP核创建的虚拟双口RAM中;当PCI-E驱动芯片接收到读取当前时间命令时,将虚拟双口RAM中时间数据传输至PCIE总线供上位机读取;实验编写了Linux系统设备驱动程序,包括驱动的编译、加载,利用图形界面开发工具GTK+编写授时测试软件;打开授时测试软件,通过指令使能授时卡PCI-E驱动芯片硬件中断,检测到FPGA输出的中断信号,测试软件进去中断服务程序读取PCI-E总线上的时间信息,并在目标栏中显示;试验结果证明:在Ubuntu Kylin系统平台下授时测试软件运行稳定、界面简洁,且授时精度达到100纳秒。To improve the time accuracy of Linux system, a Beidou timing card driver under PCI--Express interface is designed. Timing card transmits time and location information to the FPGA （Field--Programmable Gate Array） by Beidou satellite navigation receiver module. FPGA decodes time and location information by using state machine, and creates a virtual double port RAM to store data by using IP core. When the PCI-- E driver chip receives a command to read the current time, time data will be read from virtual dualport RAM and transmit to PCI--E bus for the host computer. It programs timing card drivers for Linux including the driver compilation and loading, uses GTK＋ graphical interface development tools to programming test software. Opening software and sending command to enable PCI--E driver chip hardware interrupt, when an interrupt signal output from the FPGA is found, the software runs interrupt service process will be tested and the time information on the PCI--E bus will be read and displayed in the column. Test results show that： software is stable and the interface is simpie, and the timing error is 100 ns under Ubuntu Kylin system platform.

关 键 词：LINUX PCI—Express 授时 FPGA 

分 类 号：TP31[自动化与计算机技术—计算机软件与理论]