FreeCalypso > hg > ffs-editor
view src/nucleus/tmd.c @ 17:9a8a20d45be7
Timer2 for Nucleus RTOS ticks
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Fri, 15 May 2020 04:54:15 +0000 |
| parents | 92470e5d0b9e |
| children |
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/*************************************************************************/ /* */ /* Copyright Mentor Graphics Corporation 2002 */ /* All Rights Reserved. */ /* */ /* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS */ /* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS */ /* SUBJECT TO LICENSE TERMS. */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* FILE NAME VERSION */ /* */ /* tmd.c Nucleus PLUS 1.14 */ /* */ /* COMPONENT */ /* */ /* TM - Timer Management */ /* */ /* DESCRIPTION */ /* */ /* This file contains global data structures for use within the */ /* timer management component. */ /* */ /* DATA STRUCTURES */ /* */ /* TMD_Created_Timers_List Pointer to the linked-list */ /* of created application */ /* timers */ /* TMD_Total_Timers Total number of created */ /* application timers */ /* TMD_Active_Timers_List Pointer to the linked-list */ /* of active timers. */ /* TMD_Active_List_Busy Flag indicating that the */ /* active timer list is in use*/ /* TMD_Created_List_Protect Created timer list protect */ /* structure */ /* TMD_System_Clock System clock */ /* TMD_Timer_Start Starting value of timer */ /* TMD_Timer Timer count-down value */ /* TMD_Timer_State State of timer */ /* TMD_Time_Slice Time slice count-down value */ /* TMD_Time_Slice_Task Pointer to task to time-slice*/ /* TMD_Time_Slice_State State of time slice */ /* TMD_HISR Timer HISR control block */ /* TMD_HISR_Stack_Ptr Pointer to HISR stack area */ /* TMD_HISR_Stack_Size Size of HISR stack area */ /* TMD_HISR_Priority Priority of timer HISR */ /* */ /* FUNCTIONS */ /* */ /* None */ /* */ /* DEPENDENCIES */ /* */ /* tm_defs.h Timer Management constants */ /* tc_defs.h Thread Control constants */ /* */ /* HISTORY */ /* */ /* DATE REMARKS */ /* */ /* 03-01-1993 Created initial version 1.0 */ /* 04-19-1993 Verified version 1.0 */ /* 08-09-1993 Removed timer task structures, */ /* making version 1.0a */ /* 08-09-1993 Verified version 1.0a */ /* 03-01-1994 Removed active list protect data */ /* structure since system protect */ /* is now used, resulting in */ /* version 1.1 */ /* */ /* 03-18-1994 Verified version 1.1 */ /* 04-17-1996 updated to version 1.2 */ /* 03-24-1998 Released version 1.3. */ /* 03-26-1999 Released 1.11m (new release */ /* numbering scheme) */ /* 04-17-2002 Released version 1.13m */ /* 11-07-2002 Released version 1.14 */ /*************************************************************************/ #define NU_SOURCE_FILE #include "tm_defs.h" /* Timer constants */ /* TMD_Created_Timers_List is the head pointer of the linked list of created application timers. If the list is NU_NULL, there are no timers currently created. */ CS_NODE *TMD_Created_Timers_List; /* TMD_Total_Timers contains the total number of created application timers in the system. */ UNSIGNED TMD_Total_Timers; /* TMD_Active_Timers_List is the head pointer of the linked list of active timers. This includes both the application timers and the system timers used for task sleeping and timeouts. If the list is NU_NULL, there are no timers currently active. */ TM_TCB *TMD_Active_Timers_List; /* TMD_Active_List_Busy is a flag that indicates that the active timer list is being processed. This is used to prevent multiple updates to the active timer list. */ INT TMD_Active_List_Busy; /* TMD_Created_List_Protect is used to protect the created application timers list from multiple accesses. */ TC_PROTECT TMD_Created_List_Protect; /* TMD_System_Clock is a continually incrementing clock. One is added to the clock each timer interrupt. */ UNSIGNED TMD_System_Clock; /* TMD_Timer_Start represents the starting value of the last set timer request. */ UNSIGNED TMD_Timer_Start; /* TMD_Timer is a count-down timer that is used to represent the smallest active timer value in the system. Once this counter goes to zero, a timer has expired. */ UNSIGNED TMD_Timer; /* TMD_Timer_State indicates the state of the timer variable. If the state is active, the timer counter is decremented. If the state is expired, the timer HISR and timer task are initiated to process the expiration. If the state indicates that the timer is not-active, the timer counter is ignored. */ INT TMD_Timer_State; /* TMD_Time_Slice contains the count-down value for the currently executing task's time slice. When this value goes to zero, time slice processing is started. */ UNSIGNED TMD_Time_Slice; /* TMD_Time_Slice_Task is a pointer to the task to time-slice. This pointer is built in the portion of the timer interrupt that determines if a time- slice timer has expired. */ TC_TCB *TMD_Time_Slice_Task; /* TMD_Time_Slice_State indicates the state of the time slice variable. If the state is active, the time slice counter is decremented. If the state is expired, the timer HISR is initiated to process the expiration. If the state indicates that the time slice is not-active, the time slice counter is ignored. */ INT TMD_Time_Slice_State; /* TMD_HISR is the timer HISR's control block. */ TC_HCB TMD_HISR; /* TMD_HISR_Stack_Ptr points to the memory area reserved for the timer HISR. Note that this is setup in INT_Initialize. */ VOID *TMD_HISR_Stack_Ptr; /* TMD_HISR_Stack_Size represents the size of the allocated timer HISR stack. Note that this is setup in INT_Initialize. */ UNSIGNED TMD_HISR_Stack_Size; /* TMD_HISR_Priority indicates the priority of the timer HISR. Priorities range from 0 to 2, where priority 0 is the highest. Note that this is also initialized in INT_Initialize. */ INT TMD_HISR_Priority;