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Core Operating System and Development Tools

RTTarget-32 is a Win32 subset operating system for 32- and 64-bit x86 embedded systems. Programs are developed under Microsoft Windows using standard 32-bit compilers (Borland C/C++, Microsoft Visual C/C++, Borland Delphi). Executable files built with these compilers are processed by RTTarget-32 to run on the target system.

RTTarget Features

  • Target Booting
    RTTarget-32's boot code can boot applications directly from floppy disk, hard disk, EPROM disk, flash disk, ROM, a BIOS extension, or DOS. At power-on or reset, the boot code initialises the target computer's hardware, sets up system data structures such as the GDT, IDT, and the page table, and starts the application. A PC compatible BIOS can be used for booting, but is optional. RTTarget-32's boot code can control the complete boot sequence starting at the boot vector.
  • Cross Debugging Over Serial Ports, Parallel Ports, and Ethernet
    Source-level debugging is supported using Borland's free Turbo Debugger or the debugger integrated in Microsoft Visual Studio 6.0/.NET/2005/2008/Express. Host and target computers are connected using a serial link at up to 921600 baud, a parallel port, or over Ethernet. With RTIP-32, the application can use the same Ethernet interface as the cross debugger if only one Ethernet interface is available.
  • Run-Time Library
    RTTarget-32 includes functions for physical memory access, port I/O, hardware interrupt handling, serial I/O, real-time clock access, PCI and PnP BIOS calls, PCMCIA card management, 387 FPU emulation, and more.
  • Win32 Emulation Library
    RTTarget-32 provides about 270 Win32 API functions, allowing it to run many Win32 programs unmodified. The Win32 API emulation covers memory management, file I/O (RAM files, console files, printer ports), console I/O (screen and keyboard), time-of-day and system tick, DLL management (LoadLibrary/GetProcAddress), exception handling, access to Win32 resources, memory mapped files, etc.
  • Supports C/C++ and Pascal Run-Time Systems
    The compiler's run-time system functions such as printf, malloc, fopen, etc., are fully supported. Even advanced C++ and Pascal features such as exception handling, run-time type identification, etc., are available. Alternatively, programs can run without run-time system for even less memory overhead.
  • Low Resource Requirements
    32-bit programs developed with RTTarget-32 can run in as little as 16k of memory. A typical "Hello World" program with RTTarget-32's Win32 emulation library, keyboard and screen driver, and a full C++ run-time system can boot and run on a system with about 64k of total memory.
  • Supports Privilege Levels
    Programs can run at CPU privilege level 0 or 3 to optimise either for maximum protection or best performance.
  • Supports Page-Level Protection
    The CPU's memory protection features are used to guarantee that programs cannot overwrite protected data, code, or critical system tables.
  • 387 FPU Software Emulator
    Even on CPUs without a hardware floating point unit, applications can use floating point calculations and types such as float, double, and long double. The 387 math emulator is fully reentrant and interruptible.
  • Multiprocessor Support
    RTTarget-32 has functions to start and stop additional CPUs. Spinlocks and inter-processor interrupts are available to synchronise execution among CPUs. While RTTarget-32 does not contain a multitasking scheduler, RTKernel-32 can use the multiprocessor support to schedule threads on up to 32 CPUs.
  • APIC Support
    If the target has at least one IOAPIC (Input Output Advanced Interrupt Controller), RTTarget-32 applications can use it to replace the legacy i8259 interrupt controllers. APIC mode supports a higher interrupt load and up to 32 (instead of 15) interrupt signals, requiring less IRQ sharing.
  • Supports DLLs
    Applications consist of one main program (the .exe file) and up to 31 DLLs, which can be statically linked into a program image or loaded dynamically through a file system.
  • Data Compression
    Program code and data can be compressed to save EPROM or boot disk space and accelerate downloads.
  • RAM Files
    Even when RTFiles-32 is not used, file I/O can be simulated with file images located in reserved RAM or ROM on the target. With On Time's embedded file system RTFiles-32, files on disk can also be accessed.
  • Drivers
    RTTarget-32 has built in drivers for keyboard, text-mode screen, serial ports, parallel ports, PS/2 and serial mice, and PCMCIA controllers. Since RTTarget-32 allows direct access to physical memory, I/O ports, and hardware interrupts, developing additional drivers is very easy.
  • Supports Platform RTOS32Win from acontis technologies
    With the add-on component RTVmf-32, On Time RTOS-32 programs can be executed under RTOS32Win from acontis technologies. RTOS32Win is a virtual machine framework which can execute On Time RTOS-32 programs parallel to Window under real-time conditions.
  • Supports the Real-Time Hypervisor from Real-Time Systems
    With the new add-on component RTRth-32, On Time RTOS-32 programs can be executed under the Real-Time Hypervisor from Real-Time Systems. The Real-Time Hypervisor can execute several operating systems or several instances of the same system on separate cores of multi-core or multi-CPU systems.


Using RTTarget-32

RTTarget-32 programs are compiled as standard console mode programs for 32-bit Windows; the RTTarget-32 library Rtt32.lib is simply linked to the application. The resulting .exe file is converted by RTTarget-32's locator to produce a binary image of the application. This binary image can be programmed into an EPROM, written to a boot disk, or submitted to the debugger for downloading. For example, the commands:

				cl Test.cpp Rtt32.lib
Rtloc Test
Bootdisk Test A:

would compile, link, and locate program Test and place it on an RTTarget-32 boot disk as a self-booting application. RTTarget-32 is shipped with many example projects that show how to use the RTTarget-32 locator and other tools with Microsoft Visual Studio and other compilers.




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