RI850V4 V1 Real-time OS for V850 Family

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 sych 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

Components

Processing Flow

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