Renesas M3T-MR100 用户手册

   

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The MR100 kernel modules are outlined below. 

• 

Forms a task processing queue based on task priority and controls operation so that the high-priority task at the 
beginning in that queue (task with small priority value) is executed. 

• 

Exercises the management of various task states such as the RUNNING, READY, WAITING, and SUSPENDED 
state. 

• 

Accomplishes inter-task synchronization by changing the task status from a different task. 

• 

Makes a return from the interrupt handler. 

• 

Sets up the system timer used by the MR100 kernel and starts the user-created alarm handler

  and cyclic han-

dler.

. 

• 

Gets the system status of MR100. 

• 

Reports the MR100 kernel version number or other information. 

• 

This is the function for synchronization and communication among the tasks. The following four functional mod-
ules are offered. 
 

♦ Eventflag 

Checks whether the flag controlled within the MR100 is set up and then determines whether or not to initi-
ate task execution. This results in accomplishing synchronization between tasks. 

♦ Semaphore 

Reads the semaphore counter value controlled within the MR100 and then determines whether or not to ini-
tiate task execution. This also results in accomplishing synchronization between tasks. 

♦ Mailbox 

Provides inter-task data communication by delivering the first data address. 

♦ Data 

queue 

Performs 32-bit data communication between tasks. 

• 

Provides dynamic allocation or release of a memory area used by a task or a handler. 

• 

Outside the scope of µITRON 4.0 Specification , this function performs reset processing on objects and short data 
queue function. 

                                                      

19

  This handler actuates once only at preselected times. 

20

  This handler periodically actuates.