| /* |
| * GenSM.c |
| * |
| * Copyright(c) 1998 - 2009 Texas Instruments. All rights reserved. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name Texas Instruments nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** \file GenSM.c |
| * \brief Generic state machine implementation |
| * |
| * \see GenSM.h |
| */ |
| |
| |
| #define __FILE_ID__ FILE_ID_128 |
| #include "tidef.h" |
| #include "osApi.h" |
| #include "report.h" |
| #include "GenSM.h" |
| |
| |
| /** |
| * \fn genSM_Create |
| * \brief Cerates a generic state machine object |
| * |
| * Cerates a generic state machine object. Allocates system resources. |
| * |
| * \note event/action matrix and debug descriptions are used by reference, and are not copied! |
| * \param hOS - handle to the OS object |
| * \return Handle to the generic state machine object |
| * \sa GenSM_Unload, GenSM_Init, genSM_SetDefaults |
| */ |
| TI_HANDLE genSM_Create (TI_HANDLE hOS) |
| { |
| TGenSM *pGenSM = NULL; |
| |
| /* Allocate object storage */ |
| pGenSM = os_memoryAlloc (hOS, sizeof(TGenSM)); |
| if (NULL != pGenSM) |
| { |
| /* Store OS handle */ |
| pGenSM->hOS = hOS; |
| } |
| |
| return (TI_HANDLE)pGenSM; |
| } |
| |
| /** |
| * \fn genSM_Unload |
| * \brief Unloads a generic state machine object |
| * |
| * Unloads a generic state machine object. Frees system resources consumed by the object. |
| * |
| * \param hGenSM - hanlde to the generic state machine object |
| * \return None |
| * \sa GenSM_Create |
| */ |
| void genSM_Unload (TI_HANDLE hGenSM) |
| { |
| TGenSM *pGenSM = (TGenSM*)hGenSM; |
| |
| /* free the generic state machine object storage */ |
| os_memoryFree (pGenSM->hOS, hGenSM, sizeof (TGenSM)); |
| } |
| |
| /** |
| * \fn genSM_Init |
| * \brief Initializes the generic state machine object |
| * |
| * Initializes the generic state machine object. Store handles to other modules. |
| * |
| * \param hGenSM - hanlde to the generic state machine object |
| * \param hReport - handle to the report module |
| * \return None |
| * \sa GenSM_Create, genSM_SetDefaults |
| */ |
| void genSM_Init (TI_HANDLE hGenSM, TI_HANDLE hReport) |
| { |
| TGenSM *pGenSM = (TGenSM*)hGenSM; |
| |
| /* store report handle */ |
| pGenSM->hReport = hReport; |
| } |
| |
| /** |
| * \fn genSM_SetDefaults |
| * \brief Set default values to the generic state machine |
| * |
| * Set default values to the generic state machine |
| * |
| * \note event/action matrix and debug descriptions are used by reference, and are not copied! |
| * \param hGenSM - hanlde to the generic state machine object |
| * \param uStateNum - number of states |
| * \param uEventNum - number of events |
| * \param pMatrix - pointer to the event/actions matrix |
| * \param uInitialState - the initial state |
| * \param pGenSMName - a string describing the state machine, for debug prints |
| * \param pStateDesc - strings describing the state machine states, for debug prints |
| * \param pEventDesc - strings describing the state machine events, for debug prints |
| * \param uModuleLogIndex - Log index used by the module using the state machine |
| * \return None |
| * \sa genSM_Create, genSM_Init |
| */ |
| void genSM_SetDefaults (TI_HANDLE hGenSM, TI_UINT32 uStateNum, TI_UINT32 uEventNum, |
| TGenSM_matrix pMatrix, TI_UINT32 uInitialState, TI_INT8 *pGenSMName, |
| TI_INT8 **pStateDesc, TI_INT8 **pEventDesc, TI_UINT32 uModuleLogIndex) |
| { |
| TGenSM *pGenSM = (TGenSM*)hGenSM; |
| |
| /* set values */ |
| pGenSM->uStateNum = uStateNum; |
| pGenSM->uEventNum = uEventNum; |
| pGenSM->tMatrix = pMatrix; |
| pGenSM->uCurrentState = uInitialState; |
| pGenSM->pGenSMName = pGenSMName; |
| pGenSM->pStateDesc = pStateDesc; |
| pGenSM->pEventDesc = pEventDesc; |
| pGenSM->uModuleLogIndex = uModuleLogIndex; |
| pGenSM->bEventPending = TI_FALSE; |
| pGenSM->bInAction = TI_FALSE; |
| } |
| |
| void genSM_Event (TI_HANDLE hGenSM, TI_UINT32 uEvent, void *pData) |
| { |
| TGenSM *pGenSM = (TGenSM*)hGenSM; |
| TI_UINT32 uCurrentState; |
| TGenSM_actionCell *pCell; |
| |
| #ifdef TI_DBG |
| /* sanity check */ |
| if (uEvent >= pGenSM->uEventNum) |
| { |
| TRACE3(pGenSM->hReport, REPORT_SEVERITY_ERROR , ": module: %d received event %d, which is out of events boundry %d\n", pGenSM->uModuleLogIndex, uEvent, pGenSM->uEventNum); |
| } |
| if (TI_TRUE == pGenSM->bEventPending) |
| { |
| TRACE3(pGenSM->hReport, REPORT_SEVERITY_ERROR , ": module: %d received event %d, when event %d is pending execution!\n", pGenSM->uModuleLogIndex, uEvent, pGenSM->uEvent); |
| } |
| #endif |
| |
| /* mark that an event is pending */ |
| pGenSM->bEventPending = TI_TRUE; |
| |
| /* save event and data */ |
| pGenSM->uEvent = uEvent; |
| pGenSM->pData = pData; |
| |
| /* if an event is currently executing, return (new event will be handled when current event is done) */ |
| if (TI_TRUE == pGenSM->bInAction) |
| { |
| TRACE1(pGenSM->hReport, REPORT_SEVERITY_INFORMATION , ": module: %d delaying execution of event \n", pGenSM->uModuleLogIndex); |
| return; |
| } |
| |
| /* execute events, until none is pending */ |
| while (TI_TRUE == pGenSM->bEventPending) |
| { |
| /* get the cell pointer for the current state and event */ |
| pCell = &(pGenSM->tMatrix[ (pGenSM->uCurrentState * pGenSM->uEventNum) + pGenSM->uEvent ]); |
| |
| |
| /* print state transition information */ |
| TRACE4(pGenSM->hReport, REPORT_SEVERITY_INFORMATION, "genSM_Event: module %d <currentState = %d, event = %d> --> nextState = %d\n", pGenSM->uModuleLogIndex, pGenSM->uCurrentState, uEvent, pCell->uNextState); |
| |
| /* mark that event execution is in place */ |
| pGenSM->bInAction = TI_TRUE; |
| |
| /* mark that pending event is being handled */ |
| pGenSM->bEventPending = TI_FALSE; |
| |
| /* keep current state */ |
| uCurrentState = pGenSM->uCurrentState; |
| |
| /* update current state */ |
| pGenSM->uCurrentState = pCell->uNextState; |
| |
| /* run transition function */ |
| (*(pCell->fAction)) (pGenSM->pData); |
| |
| /* mark that event execution is complete */ |
| pGenSM->bInAction = TI_FALSE; |
| } |
| } |
| |
| /** |
| * \fn genSM_GetCurrentState |
| * \brief retrieves the state machine current state |
| * |
| * retrieves the state machine current state |
| * |
| * \param hGenSM - hanlde to the generic state machine object |
| * \return state machine current state |
| */ |
| TI_UINT32 genSM_GetCurrentState (TI_HANDLE hGenSM) |
| { |
| TGenSM *pGenSM = (TGenSM*)hGenSM; |
| |
| return pGenSM->uCurrentState; |
| } |
