HVAC Control in the New Millennium.pdf - HVAC.Amickracing

PC-based Control, Software and Bus TrendsWindows CE uses a graphics device interface with more than 50available components. The use and arrangement of these componentsallows application interfaces for specific products.No longer being tied to the X86 microprocessors is a new developmentfor Windows products. Windows CE has been ported to at least fiveprocessor families including MIPS, SH3/4, PowerPC, and Arm/StrongArm processors as well as a variety of peripheral devices, includingPCMCIA, PC Card, PCI, and ISA buses. I/O types include modems,Ethernet, serial, parallel, infrared, keyboards, displays, flash memory, rotatingmedia, wireless, touch screens and voice. Device drivers are used tosupport custom peripherals. There is also device power management.Windows CE provides graphics, windowing, event management,support for color, fonts, dialog boxes, shell, printing, sound, I/O, andfiles. Windows CE can run 32 protected processes and an unlimitednumber of threads. With one processor, it supports preemptive, prioritybasedscheduling, and has eight priority levels with the ability to handlepriority inversion.CE uses virtual memory where memory is allocated to applicationsone page at a time. The page size is determined by the application. Ina hand-held application, the memory page size is usually 1K-4K bytes.Many Windows 95-based applications can be ported to WindowsCE. Only a subset of Win32 API is supported and some of this has areduced feature set with fewer supported window styles and limitedsupport for colors and fonts.DevelopmentWindows CE development tools for system design include PlatformBuilder with OS modules and sample configurations. It is set upfor PC-based or Hitachi D9000 reference platforms. The Platform Buildersupports object-oriented programming through Microsoft’s ComponentObject Model (COM). Other development tools include sample OALs,device drivers and a configuration tool to select only the componentsthat are needed for an application. A ROM image maker and remotedebugger are also provided. The tools provide the ability to developapplications using an emulation of a real device.Language support for application development consists of thesame language-based tools used for standard Windows 9x/NT programming.These include Visual C++ and Visual Basic.©2001 by The Fairmont Press, Inc. All rights reserved.