Overview

This product is a real-time operating system (real-time OS) that is an implementation of the μITRON4.0 specification. μITRON is the predominant real-time OS for embedded systems in Japan. Its low resource requirements, outstanding real-time performance, and broad range of service calls make it very suitable for embedded systems requiring true real-time and multi-tasking capabilities.

In addition, its high degree of compatibility with the compiler package from Renesas Electronics and multitasking debugging on the IDE will help you greatly reduce development times and get your products to market more quickly.

Screen Image: Configurator
Screen Image : Debugging Extension
Image: Cooperation with 3rd parties
Screen Image: Configurator
Screen Image : Debugging Extension
Image: Cooperation with 3rd parties
  • Conformance with the µITRON4.0 Specification
    The design conforms with the µITRON4.0 Specification, which prescribes a representative OS architecture for embedded control.
  • Real-time performance
    Task switching time is 1.1μsec, which is even faster than the previous product. Time it takes a target task to be activated after a wup_tsk is issued. (SH7750@200MHz, at the time of cache hit) [Learn More]
  • Superb functionality
    Supports more than 100 service calls, such as the dynamic task generation system call.They support various applications.[Learn More]
  • Configurator
    The configurator is equipped which makes the setup of OS construction parameters easier.[Learn More]
  • Supports the multi-task functionality in High-performance Embedded Workshop
    The Debugging Extension is an optional software which supports the following functions:[Learn More]：
    • Displaying the states of OS control objects such as tasks, semaphores, etc.
    • Issues the service calls for task activation and event flag setting etc.
    • Graphically-displayed service call history
  • Cooperation with 3rd parties
    We provide various solutions to deliver great environments for debugger/application software development, distribution of middleware, customization, and hardware platform etc. in conjunction with our partner vendors.
  • Target CPU: SuperH RISC engine Family SH-4、SH-4A (MMU (Memory Management Unit) is not supported.)
  • Supported compiler: C/C++ Compiler Package for SuperH Family
  • Learn More

Latest Ver.: V.2.03 Release 00
Released: Nov 01, 2011
Details of upgrade (See Tool News)
Operating Environment
Agreement Details

Downloads

Documentation

Additional Details

Supported CPU Cores

SH-4, SH-4A
*MMU (Memory Management Unit) is not supported.

Functions

The HI7750/4 kernel consists of the following modules. Each module is provided by functions (service calls) .

  • Scheduler
    Manages execution sequence of multiple tasks based on their priority levels.
  • Task management
    Manages task status such as RUNNING, READY, WAITING or SUSPENDED.
  • Task-dependent synchronization
    Changes task status from other task, and synchronizes tasks.
  • Interrupt processing
    Returns from an interrupt handler.
  • Time management
    Sets system timer used by HI7750/4 kernel and starts user-defined alarm handler, cyclic handler and overrun handler.
  • System State Management
    Reports information such as version number of HI7750/4 kernel.
  • Synchronization/communication
    Carries out synchronization and communication between tasks. The following function modules are available:
    • Event flag
      Tasks are synchronized by the status of flags managed by the kernel.
    • Semaphore
      Tasks are synchronized by the semaphore counter value managed by the kernel.
    • Mail box
      Tasks are synchronized by sending or receiving a message.
    • Data queue
      Tasks are synchronized by communicating 4-byte data.
  • Extended Synchronization/Communication
    Carries out synchronization and communication between tasks. The following function modules are available:
    • Message buffer
      Makes use of variable-length data communication to synchronize tasks.
    • Mutex
      Makes use of priority ceiling protocol for avoiding priority inversion to synchronize tasks.
  • Memory pool management
    Dynamically allocates/frees memory area used by tasks. Enables efficient use of memory.
  • Task exception
    Controls execution of task exceptions by, for example, defining or activating a task exception.
  • Cyclic handler function
    Controls the execution of a handler activated periodically.
  • Alarm handler function
    Controls the execution of a handler activated at the specified relative-time.
  • Overrun handler function
    Controls the execution of a handler activated when the specified time has been exceeded.
  • Extended service call function
    Renesas original functions are following:
    • Task event flags
      Makes use of task event flag state to synchronize tasks.
    • Cache support function
      Initialize cache, clear cache, and flush cache etc.

Specifications

(Time takes for a target task to be executed after the wup_tas is issued.):  
Specifications/Functions:・Supports the following functions including uITRON4.0 spec-compliant standard profile.
　・Service calls for dynamic object creation(cre_???, acre_???) and deletion(del_???)
　・Mutex (TA_CEIL attribute only)
　・Message buffer
　・Variable-length memory pool
　・Alarm handler
　・Over handler
・The following are the Renesas-specific functions
　・Task-attached event flag
　・Cache support function		 
Scheduling types:Priority basis type / Event-driven type 
Target CPU:SH-4, SH-4A
*MMU is not supported.		 
Service call number:152
(Count xxx_yyy plus ixxx_yyy as one)		 
Maximum object number:1023 (Only the cycle handler and the alarm handler have 15 each)
A maximum value can be selected with the configurator		 
Maximum priority number:255, A maximum value can be selected with the configurator 
Application operating mode:All application programs are operated in privileged mode 
Performance0.45 microseconds (SH7785, 600MHz, cache enabled) 
Kernel code size:From 7.5K bytes to 46K bytes
Kernel RAM usage per task:Data:64 bytes
Stack: 196 bytes		 

Components

Provided itemsExplanationNote
Kernel source programKernel source programProvided only with mass- production licenses which include source code.
Kernel library・Kernel library for system building
・Cache support library		Compliant with big/little endian
Standard header files・ITRON specification common definition files
・Kernel specification definition files
・Other definition files		Header files are provided both in Assembler and C languages
ConfiguratorTo configure a construction parameter—
Various sample programs・CPU initialization routine assembler source
・CPU initialization routine C source
・Exception enter/exit processing assembler source
・Section initialization processing C source
・Section information definition file
・Undefined interrupt detailed information acquisition process source
・System down routine source
・Timer driver source		—
Workspace for construction・HEW workspace for system building
・Project file for separate linkage
・Project file for whole linkage		—
ManualHI7000/4 series user's manual—

Processing Flow

hi7750-4-flow-e