基于WinCE的嵌入式无线投影网关设计
摘要
嵌入式就是将微处理器嵌入各种电子设备内部实现设备的智能化。随着信息技术的发展和数字化产品的普及,从消费电器到工业设备,从民用产品到军用器材,嵌入式系统设备已经应用到网络、手持设备终端、国防军事、消费电子和自动化控制等各个领域。嵌入式系统的广泛应用前景和发展潜力使其成为21世纪的应用热点之一。
本文描述的嵌入式无线投影网关采用AMD Geode GX533处理器和Windows CE系统,该设备通过标准的VGA接口连接到投影机,通过无线局域网接收数据,能够将普通PC或笔记本电脑的桌面在投影机上还原出来。可以让使用者在电脑上方便的进行文档、应用程序和图片的演示而不受视频电缆的束缚。该设备同时可以脱离电脑,独立的读取各种格式的文件如doc、ppt、bmp、mpeg等,具有广泛的应用前景。
本论文首先介绍了嵌入式系统及无线局域网的原理,然后介绍了无线投影网关系统的总体设计方案,详细分析了Windows CE操作系统结构及原理,对系统中用到的关键技术进行了详细的介绍,包括屏幕拷贝、JPEG压缩算法研究、Windows CE内核的定制方式、Windows CE中Web Server服务、Windows CE中无线网络的配置方式。最后给出了整个无线投影网关的软件系统的测试方法,同时测试了设备的性能。本文论述的系统已经实现并经过实验验证,可作为其他嵌入式应用系统开发的参考。
Embedding is to implant microprocessors inside electronic devices in purpose to make them more automatic, more intelligent. With the development of information technology and the popularity of digital products, from simple electronic devices to industrial equipments, from civilian products to military equipments, Embedded Systems have already been used in many fields such as networking, military defense, automation, wireless communication. The Embedded system topic is one of the hottest issues of 21st century for its development potential and broad prospects in applications.
This paper describes an embedded wireless projector gateway that uses the AMD Geode GX533 processor and Windows CE as OS. This equipment is connected to the projector using the standard VGA interface and receives data from a wireless LAN interface. In the meantime, it can display a classic PC or notebook’s desktop. This enables users to easily perform documents, applications or picture’s presentation without worrying about cable’s length. The presented equipment can be used as a standalone device. Beside this, it also can read various documents such as doc, PPT and BMP files. Therefore it has a broad application prospect.
This paper first introduces the principle of embedded system and wireless LAN then describes the whole design of the embedded wireless gateway projector. The Windows CE operating system’s structure and principles are also presented. Details are given on the system used key technologies such as screen copy, JPEG compression algorithm, Windows CE kernel customization, Web Server in Windows CE and wireless Network configuration program. Finally the testing process and test results of the entire system are presented. The system described is this paper has been realized and can be used as a reference in other embedded system developments.
本文描述的嵌入式无线投影网关采用AMD Geode GX533处理器和Windows CE系统,该设备通过标准的VGA接口连接到投影机,通过无线局域网接收数据,能够将普通PC或笔记本电脑的桌面在投影机上还原出来。可以让使用者在电脑上方便的进行文档、应用程序和图片的演示而不受视频电缆的束缚。该设备同时可以脱离电脑,独立的读取各种格式的文件如doc、ppt、bmp、mpeg等,具有广泛的应用前景。
本论文首先介绍了嵌入式系统及无线局域网的原理,然后介绍了无线投影网关系统的总体设计方案,详细分析了Windows CE操作系统结构及原理,对系统中用到的关键技术进行了详细的介绍,包括屏幕拷贝、JPEG压缩算法研究、Windows CE内核的定制方式、Windows CE中Web Server服务、Windows CE中无线网络的配置方式。最后给出了整个无线投影网关的软件系统的测试方法,同时测试了设备的性能。本文论述的系统已经实现并经过实验验证,可作为其他嵌入式应用系统开发的参考。
Embedding is to implant microprocessors inside electronic devices in purpose to make them more automatic, more intelligent. With the development of information technology and the popularity of digital products, from simple electronic devices to industrial equipments, from civilian products to military equipments, Embedded Systems have already been used in many fields such as networking, military defense, automation, wireless communication. The Embedded system topic is one of the hottest issues of 21st century for its development potential and broad prospects in applications.
This paper describes an embedded wireless projector gateway that uses the AMD Geode GX533 processor and Windows CE as OS. This equipment is connected to the projector using the standard VGA interface and receives data from a wireless LAN interface. In the meantime, it can display a classic PC or notebook’s desktop. This enables users to easily perform documents, applications or picture’s presentation without worrying about cable’s length. The presented equipment can be used as a standalone device. Beside this, it also can read various documents such as doc, PPT and BMP files. Therefore it has a broad application prospect.
This paper first introduces the principle of embedded system and wireless LAN then describes the whole design of the embedded wireless gateway projector. The Windows CE operating system’s structure and principles are also presented. Details are given on the system used key technologies such as screen copy, JPEG compression algorithm, Windows CE kernel customization, Web Server in Windows CE and wireless Network configuration program. Finally the testing process and test results of the entire system are presented. The system described is this paper has been realized and can be used as a reference in other embedded system developments.
引文
[1]王庆江,董渭清.嵌入式系统及其开发领域典型特征分析.计算机应用研究, 2002, l9(4): 11~l3.
[2]曹运金.信息家电离我们究竟有多远.家用电器科技, 2001, (1): 11~12.
[3]杨波,徐成.嵌入式CAN-Ethernet网关的设计与实现.计算机应用, 2005, 25(2): 273~275.
[4]胡春哲,寿国础.嵌入式通信系统软/硬件接口配置方案的研究.计算机工程与应用, 2000, 9(1): l27~129.
[5]李林,李晖,王丹卉.基于802.1x协议的无线局域网安全性研究.电子科技, 2004, (7): 23~25.
[6] AMD Company. 31506_cs5535_databook.pdf. 2004. 36~38.
[7] AMD Company. 31505_gx_databook.pdf. 2004. 71~74.
[8] AMD Company. 31533_gx_2.1_specupdate.pdf. 2004. 31~33.
[9]刘文珂.嵌入式处理器与嵌入式软件研究.计算机应用, 2001, 27(11): 22~24.
[10]张冬泉,王雪梅等. Windows CE实用技术开发.北京:电子工业出版社, 2006. 22~23.
[11]周毓林. Windows CE.net内核定制及应用开发.北京:电子工业出版社, 2005. 17~18.
[12]陈耀武,王沛然. Windows CE.net系统在XScale上的移植.工业控制计算机, 2004, (17): 30~31.
[13]微软公司, Windows CE Programmer's Guide程序员指南,北京:希望电子出版社, 1999. 33~34.
[14] Smith, Jack. Basics of industrial Ethernet. Plant Engineering, 2004, 58(8): 65~71.
[15] Koopman ,P. Embedded system security. Computer, 2004,37(7): 95~97.
[16] Mitchell, Peter. 16-BIT MCU FACES THE 32-BIT MPU. New Electronics, 1987, 20(20): 67~70.
[17]刘文杰,傅海洋,吴蒙. LMDS系统安全认证协议的形式分析与改进.计算机工程, 2003, 29(22): 48~50.
[18]郑君杰,肖军模,程林. WAPI协议及其安全性分析.电视技术, 2004, 5(1): 31~33.
[19]吕霞,杨军. WLAN标准GB15629.11安全机制一WAPI协议解析.电子设计应用, 2004, 10(10): 80~83.
[20]张丰翼,刘晓寒,马文平等.无线局域网安全的关键问题.信息安全与通信保密, 2004, (5): 34~37.
[21] W.B. Pennebaker, Joan L.Mitchell. JPEG: Still Image Data Compression Standard. Van Nostrand Reinhold, New York, 1993, 39(1): 47~50.
[22] B.G. Sherlock and Y.P. Kakad. Transform domain technique for windowing the DCT and DST, Journal of the Franklin Institute, 2002, 339(1): 111~120.
[23] Kuo-Liang Chung and Wen-Ming Yan. Fast 2D discrete cosine transform on compressed image in restricted quadtree and shading format. Information Processing Letters, 2002, 81(1): 13~21.
[24] Netravali, Haskel B. Digital Picture Processing. Second ED, New York Academic Press, 1982. 11~14.
[25] Haque M. Two-Dimensional Fast Cosine Transform. IEEE Trans on Acoustics Speech and signal Processing. 1985, (33): 6~7.
[26] Ahmed N. Discrete Cosine Transform. IEEE Tran Computers, 1974, 23(1): 90~93.
[27] Clarke, R. Transform Coding of Images. Academic Press, New York Academic Press, 1985. 51~52.
[28]傅坚.无线宽带固定接入系统的安全性分析.计算机工程, 2004, 30(6): 14~15.
[29]倪源,彭志威.宽带无线网络中的安全问题.全国网络与信息安全技术研讨会2004论文集.北京, 2004. 319~325.
[30]伊传勇,刘寿强,毕雅宁.营造安全的无限空间—无线局域网新标准WAPI解析.计算机安全, 2004, 7(1): 34~42.
[31] Aizawa K, Harashima H, Miyakawa H. Adapative Vector Quantization of PictureSinals in Discrete Cosine Transform Domain. IECE s.Japan. 1986, 69(3): 228~236.
[32] Jon Edney, Wiliam A.Arbaugh. Real 802.11 Security-Wi-Fi Protected Access and 802.11i. Pearson Education, 2003, 32(2): 41~46.
[33] Bo Yan, Ng, K. A survey on the techniques for the transport of MPEG-4 video over wireless networks. IEEE Personal Communications, 2002, 8(4): 863~873.
[34]周雪莉,胡爱群,陈立全. WPA--无线局域网安全新规范.信息网络安全, 2003, (10): 26~28.
[35]陶晓明,孙树峰.无线安全协议802.1x的认证研究.现代电子技术, 2004, (13): 31~35.
[36]王传启,邓文栋,金敏.工业系统中嵌入式Web服务器的设计与实现.计算机工程与应用, 2002, 38(10): 227~230.
[37]章承科.多核处理器构架的高速JPEG解码算法.单片机与嵌入式系统应用, 2006, (1): 44~47.
[38] IEEE Std 802.11, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications. 1999.
[39] Nancy Cam-Winget, Tim Moore, Dorothy Stanley etc. IEEE 802.11i over view. Pearson Education, 2003, 32(2): 31~33.
[40] K. J. Negus, A. P. Stephens, J. Lansford. HomeRF: wireless networking for the connected home. IEEE Personal Communications, 2000, 7(1): 20~22.
[41] Johnston D.Walker. Over view of IEEE802.16 Security. IEEE Security & Privacy, 2004, 2(3): 40~48.
[42]张曦煌,柴志雷.嵌入式web服务器中CGI的特点及实现,小型微型计算机系统, 2003, 24(11): 2046~2048.
[43]金敏,周翔.变电站自动化系统中嵌入式Web服务器的设计与实现.电力系统自动化, 2002, 26(18): 65~69.
[2]曹运金.信息家电离我们究竟有多远.家用电器科技, 2001, (1): 11~12.
[3]杨波,徐成.嵌入式CAN-Ethernet网关的设计与实现.计算机应用, 2005, 25(2): 273~275.
[4]胡春哲,寿国础.嵌入式通信系统软/硬件接口配置方案的研究.计算机工程与应用, 2000, 9(1): l27~129.
[5]李林,李晖,王丹卉.基于802.1x协议的无线局域网安全性研究.电子科技, 2004, (7): 23~25.
[6] AMD Company. 31506_cs5535_databook.pdf. 2004. 36~38.
[7] AMD Company. 31505_gx_databook.pdf. 2004. 71~74.
[8] AMD Company. 31533_gx_2.1_specupdate.pdf. 2004. 31~33.
[9]刘文珂.嵌入式处理器与嵌入式软件研究.计算机应用, 2001, 27(11): 22~24.
[10]张冬泉,王雪梅等. Windows CE实用技术开发.北京:电子工业出版社, 2006. 22~23.
[11]周毓林. Windows CE.net内核定制及应用开发.北京:电子工业出版社, 2005. 17~18.
[12]陈耀武,王沛然. Windows CE.net系统在XScale上的移植.工业控制计算机, 2004, (17): 30~31.
[13]微软公司, Windows CE Programmer's Guide程序员指南,北京:希望电子出版社, 1999. 33~34.
[14] Smith, Jack. Basics of industrial Ethernet. Plant Engineering, 2004, 58(8): 65~71.
[15] Koopman ,P. Embedded system security. Computer, 2004,37(7): 95~97.
[16] Mitchell, Peter. 16-BIT MCU FACES THE 32-BIT MPU. New Electronics, 1987, 20(20): 67~70.
[17]刘文杰,傅海洋,吴蒙. LMDS系统安全认证协议的形式分析与改进.计算机工程, 2003, 29(22): 48~50.
[18]郑君杰,肖军模,程林. WAPI协议及其安全性分析.电视技术, 2004, 5(1): 31~33.
[19]吕霞,杨军. WLAN标准GB15629.11安全机制一WAPI协议解析.电子设计应用, 2004, 10(10): 80~83.
[20]张丰翼,刘晓寒,马文平等.无线局域网安全的关键问题.信息安全与通信保密, 2004, (5): 34~37.
[21] W.B. Pennebaker, Joan L.Mitchell. JPEG: Still Image Data Compression Standard. Van Nostrand Reinhold, New York, 1993, 39(1): 47~50.
[22] B.G. Sherlock and Y.P. Kakad. Transform domain technique for windowing the DCT and DST, Journal of the Franklin Institute, 2002, 339(1): 111~120.
[23] Kuo-Liang Chung and Wen-Ming Yan. Fast 2D discrete cosine transform on compressed image in restricted quadtree and shading format. Information Processing Letters, 2002, 81(1): 13~21.
[24] Netravali, Haskel B. Digital Picture Processing. Second ED, New York Academic Press, 1982. 11~14.
[25] Haque M. Two-Dimensional Fast Cosine Transform. IEEE Trans on Acoustics Speech and signal Processing. 1985, (33): 6~7.
[26] Ahmed N. Discrete Cosine Transform. IEEE Tran Computers, 1974, 23(1): 90~93.
[27] Clarke, R. Transform Coding of Images. Academic Press, New York Academic Press, 1985. 51~52.
[28]傅坚.无线宽带固定接入系统的安全性分析.计算机工程, 2004, 30(6): 14~15.
[29]倪源,彭志威.宽带无线网络中的安全问题.全国网络与信息安全技术研讨会2004论文集.北京, 2004. 319~325.
[30]伊传勇,刘寿强,毕雅宁.营造安全的无限空间—无线局域网新标准WAPI解析.计算机安全, 2004, 7(1): 34~42.
[31] Aizawa K, Harashima H, Miyakawa H. Adapative Vector Quantization of PictureSinals in Discrete Cosine Transform Domain. IECE s.Japan. 1986, 69(3): 228~236.
[32] Jon Edney, Wiliam A.Arbaugh. Real 802.11 Security-Wi-Fi Protected Access and 802.11i. Pearson Education, 2003, 32(2): 41~46.
[33] Bo Yan, Ng, K. A survey on the techniques for the transport of MPEG-4 video over wireless networks. IEEE Personal Communications, 2002, 8(4): 863~873.
[34]周雪莉,胡爱群,陈立全. WPA--无线局域网安全新规范.信息网络安全, 2003, (10): 26~28.
[35]陶晓明,孙树峰.无线安全协议802.1x的认证研究.现代电子技术, 2004, (13): 31~35.
[36]王传启,邓文栋,金敏.工业系统中嵌入式Web服务器的设计与实现.计算机工程与应用, 2002, 38(10): 227~230.
[37]章承科.多核处理器构架的高速JPEG解码算法.单片机与嵌入式系统应用, 2006, (1): 44~47.
[38] IEEE Std 802.11, Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications. 1999.
[39] Nancy Cam-Winget, Tim Moore, Dorothy Stanley etc. IEEE 802.11i over view. Pearson Education, 2003, 32(2): 31~33.
[40] K. J. Negus, A. P. Stephens, J. Lansford. HomeRF: wireless networking for the connected home. IEEE Personal Communications, 2000, 7(1): 20~22.
[41] Johnston D.Walker. Over view of IEEE802.16 Security. IEEE Security & Privacy, 2004, 2(3): 40~48.
[42]张曦煌,柴志雷.嵌入式web服务器中CGI的特点及实现,小型微型计算机系统, 2003, 24(11): 2046~2048.
[43]金敏,周翔.变电站自动化系统中嵌入式Web服务器的设计与实现.电力系统自动化, 2002, 26(18): 65~69.