Overview
Description
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 CS+ IDE and the configurator which automatically generates startup files will help you greatly reduce development times and get your products to market more quickly.
Important:This product is a separate product from RI850V4 V2.00.xx.
Features
- Conformance with the µITRON4.0 Specification
The design conforms with the µITRON4.0 Specification, which prescribes a representative OS architecture for embedded control. - Excellent portability
To support its execution in various environments, the RI850V4 is separated into the target-dependent section for hardware-dependent processing and the parts for use in the user’s own code. Sample files of source code are provided. This enhances portability to various execution environments and facilitates customization. - ROM-based implementation
Since the system is a real-time and multi-tasking OS designed on the assumption of usage in embedded execution environments, it was designed to be compact and ready for ROM-based implementation. A system can be configured with only those service calls that are actually used in the user’s application being linked (rather than all service calls provided by the RI850V4), so a real-time/multi-tasking OS which is optimally compact in terms of the user's needs can be configured. - Realization of memory savings
The ability to disable preemption provided by the RI850V4 can reduce a system's memory requirements. - Interlinking with the CS+ Integrated Development Environment from Renesas Electronics[Learn More]
- Automatic settings for options required in building the OS
- Displaying the states of OS control objects such as tasks, semaphores, etc. (Resource Information)
- Generates service calls to start up tasks from debugger, set up event flags, etc.
- Graphical display of the history of task operations and of issuing service calls (system performance analyzer)
- Interlinking with Green Hills Software, MULTI IDE from LLC[Learn More]
- Supported compiler: CC-RH, GHS
- Learn More
Release Information
Details of upgrade (See Tool News)
Operating Environment
Agreement Details
OS
Latest Ver.: V1.01.00
Released: Oct 1, 2014
CS+ interface plug-ins (RTOS Common plug-in)
Latest Ver.: V3.00.00
Released: Oct 1, 2014
CS+ interface plug-ins (Plug-in for RI850V4 V1)
Latest Ver.: V3.00.00
Released: Oct 1, 2014
Target Devices
Design & Development
Additional Details
Functions
The RI850V4 kernel consists of the following modules. Each module is provided by functions (service calls) .
- Task management functions
Provided by the RI850V4 include a function to reference task statuses such as priorities and detailed task information, in addition to a function to manipulate task statuses such as generation, activation and termination of tasks. - Task dependent synchronization functions
Changes task status from other task, and synchronizes tasks. - Task exception handling functions
The task exception handling functions of the RI850V4 include a function related to the task exception handling routine that is activated when a task exception handling request is issued (function for manipulating or referencing the task exception handling routine status). - Synchronization and communication functions
The synchronization and communication functions of the RI850V4 consist of Semaphores, Eventflags, Data Queues, and Mailboxes that are provided as means for realizing exclusive control, queuing, and communication among tasks.- Semaphores: In the RI850V4, non-negative number counting semaphores are provided as a means (exclusive control function) for preventing contention for limited resources (hardware devices, library function, etc.) arising from the required conditions of simultaneously running tasks.
- Eventflags: Provides 32-bit eventflags as a queuing function for tasks.
- Data Queues: Provides the data queues that have the data queue area in which data read/write is enabled for transferring the prescribed size of data.
- Mailboxes: Provides a mailbox, as a communication function between tasks, that hands over the execution result of a given processing program to another processing program.
- Extended synchronization and Communication functions
Provides Mutexes as the extended synchronization and communication function for implementing exclusive control between tasks.- Mutexes: Provides a mutex, as a function to prevent contentions on using the resources.
- Fixed-Sized Memory Pools
When a dynamic memory manipulation request is issued from a processing program in the RI850V4, the fixed-sized memory pool is provided as a usable memory area. - Variable-Sized Memory Pools
When a dynamic memory manipulation request is issued from a processing program in the RI850V4, the variable-sized memory pool is provided as a usable memory area. - Time management functions
Provides methods to implement time-related processing (Timer Operations: Delayed task wakeup, Timeout, Cyclic handlers) by using base clock timer interrupts that occur at constant intervals, as well as a function to manipulate and reference the system time. - System state management functions
Provides functions for referencing the system status such as the context type and CPU lock status, as well as functions for manipulating the system status such as ready queue rotation, scheduler activation, or the like. - Interrupt management functions
The RI850V4 provides as interrupt management functions related to the interrupt handlers activated when an interrupt (maskable interrupt, software interrupt, reset interrupt) is occurred. - Service call management functions
Provides the function for manipulating the extended service call routine status, such as registering and calling of extended service call routines. - Scheduler
The scheduling functions provided by the RI850V4 consist of functions manage/decide the order in which tasks are executed by monitoring the transition states of dynamically changing tasks, so that the CPU use right is given to the optimum task.
Specifications
| Target device | V850 |
|---|---|
| Maximum number of tasks | 255 |
| Number of priority levels | 32 |
| Service call number | 132 |
| Performance (Time takes for a target task to be executed after the wup_tas is issued.) |
16 microseconds (V850E/MA1, 25MHz. embedded memory) |
| Kernel code size | From 6K bytes to 20K bytes |
| Kernel RAM usage per task | data : 32 bytes stack : 128 bytes |
Components
| Provided items | Explanation | Note |
|---|---|---|
| Kernel source program | Kernel source program | Provided only with mass- production licenses which include source code. |
| Kernel library | Kernel library for system building | — |
| Standard header files | ITRON specification common definition files Kernel specification definition files Other definition files |
Header files are provided both in C languages |
| Command line configurator | Outputs all types of definition files from the cfg file that describes the structure parameters in text. | — |
| Sample program | A simple program using ITRON. | — |
| CS+ interface plug-ins - RTOS Common plug-in - Plug-in for RI850V4 |
Function for easy kernel embedding Function for referencing the OS state during debug |
— |
| System performance analyzer | A tool that displays a transition diagram of the OS operation history and analyzes performance, such as CPU usage rate. | Interfaces with CS+ and MULTI |
| Task debugger | A tool for referencing the OS state during debug | Interfaces with MULTI |
| Manual | User's manual |
Processing Flow
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