MTK中的nvram的操作实现

1NVRAM读写操作详解voidnvramtask_main(task_entry_struct*task_entry_ptr){kalgetmy_task_index(&my_index);/*nvramspecialservice*/nvramspecialservice();while(1){//从Q中得到消息receivemsgext_q(task_info_g[task_entry_ptr->task_indx].task_ext_qid,entilmstacksetactivemoduleidmyindexcurrentilmdest_mod_id);//处理消息nvrammain¤t_ilm);//释放消息eilmcurrentilm}}Nvram_mainvoidnvrammain(ilm_struct*ilm_ptr){ifilmptrNULL){2ifilmptr->msg_id>=MSG_ID_NVRAM_CODE_BEGIN)&&(ilm_ptr->msg_id<=MSGIDNVRAMCODEEND)){ifilmptrmsgid==MSG_ID_NVRAM_STARTUP_REQ){///STARTUPnvramstartup_handler(ilm_ptr);}elseifilmptrmsgid==MSG_ID_NVRAM_RESET_REQ){/RESETnvramreset_handler(ilm_ptr);}elseifilmptrmsgid==MSG_ID_NVRAM_READ_REQ){nvram_read_handler(ilm_ptr);//READ消息}elseifilmptrmsgid==MSG_ID_NVRAM_WRITE_REQ){nvram_write_handler(ilm_ptr);//WRITE消息}elseifilmptrmsgid==MSG_ID_NVRAM_SET_LOCK_REQ){msetlockhandlerilmptrLOCKTST}}endofmodulemainfunction*/也可以看到NVRAMtask处理几个消息.3EADNVNV中读取一个数据,例如读取语言设置信息:ReadValueNVRAMSETTING_LANG,&data,DS_BYTE,&error);我们需要注明,NVRAM的LID,读取数据存放的指针,数据类型,和返回错误信息的地址.defineReadValuenIdpBuffer,nDataType,pError)\ReadValueIntnIdpBuffer,nDataType,pError,__FILE__,__LINE__)ReadValue需要注明文件和第多少行,方面了应用使用.看一下ReadValueReadValueInt这个函数ReadValueInt我们来看看这个函数到底干了什么事情:S32ReadValueInt(U8nDataItemId,void*pBuffer,U8nDataType,S16*pError,S8*fileName,er{ataType{DSBYTE{lagbyte猜测,NVRAM后验证)/*secondtimereading,italwasyreturnonerequestitem*/teDataReadFlag{//这个注释就更加明白了/*DataiscachednoneedtoreadfromNVRAM*/memcpypBuffer&byte_data[nDataItemId*nDataType],nDataType);DSBYTErrorNVRAMREADSUCCESS}/*processfirsttimereadingalldataandreturnfirstrequestitemdata*/4{/*ReaddatafromtheNVRAMfile*/KUtempBuffer[NVRAM_CACHE_SIZE];//这个函数重点分析eadRecordIntNVRAM_EF_CACHE_BYTE_LID,mpBuffermpBufferumber/*copyoutalltotalreadingdata*///把读取的数据amemcpybytedata,tempBuffer,sizeof(tempBuffer));byteDataReadFlag=1;/*returnfirstrequestitemdata*/memcpypBuffer&byte_data[nDataItemId*nDataType],nDataType);DSBYTErrorNVRAMREADSUCCESS}break;EndofcaseDS_BYTE*///后面的5总结:总结:DSSHORT{EndofcaseDS_SHORT*/SDOUBLE{EndofcaseDS_DOUBLE*/}orreturnstatus}RReadValueInt里面,就读一次.关键的函数是:ReadRecordInt.yteledefineReadRecordIntnFileIdnRecordId,pBuffer,nBufferSize,pError,fileName,lineNumber)\AccessRecordInt(nFileId,nRecordId,pBuffer,nBufferSize,1,pError,MMI_FALSE,MMITRUEfileNamelineNumber)S32AccessRecordInt(U16nFileId,U16nRecordId,void*pBuffer,U16nBufferSize,U16nRecordAmount,S16*pError,pBOOLisWrite,pBOOLisValue,S8*filename,S32ineNumber{6QUEUEqueueNodeU2my_index;circularQcheckenumcircularQcheckresultcircularQ_check_never_check;staticUnvramreqcount0;MIBOOLtoPushsWriteD}{//发了一个消息AMReadReqnFileIdnRecordIdnRecordAmountMessageoslMsgIdMessageoslMsgIdMSGID_MMI_EQ_NVRAM_READ_REQ;EQQ}nvramprocedure//REQRRSP消息来while(1){/*ifmorethan1accessrequestexist,gothroughthecircularQ*/if((nvram_req_count>0)&&(circularQ_check_result==cularQchecknevercheck{circularQcheckresultNVRAMCheckCircularQqueueNodenFileId);}ifcircularQcheckresult=circularQ_check_found)7{OslReceiveMsgExtQmmiextqidqueueNodeGetMyTaskIndexmyindexslStackSetActiveModuleIDmyindexMODMMI}//这个标志位先置空,不管,先记住它toPushMMI_FALSE;queueNodemsgid{//这里列出了很多消息,其他不管,先找DRSPcaseMSGIDMMIEQPLAYAUDIORSP:caseMSGIDMMIEQSTOPAUDIORSP:caseMSGIDMMIEQEXEGPIOLEVEL_RSP:caseMSGIDMMIEQSETVOLUMERSP:caseMSGIDMMIEQKEYPADDETECTIND:eMSGIDTIMEREXPIRY//就它了caseMSGIDMMIEQNVRAMREADRSP{mmieqnvram_read_rsp_struct*readMessage;readMessage=(mmi_eq_nvram_read_rsp_struct*)queueNode.oslDataPtr;{ifreadMessageresultflag==MMI_OK){//读成功了,再比较一下数据大小是不是合格ifreadMessagelengthnBufferSize)8{}elseifreadMessagelengthnBufferSize){}{memcpypBufferreadMessage->data,readMessage->length);RAMREADSUCCESS}sreadMessagelength}reeInterTaskMsgqueueNode}toPushMMI_TRUE;break;}caseMSGIDMMIEQNVRAMWRITERSP:}iftoPushMMI_TRUE){mstructilmptrflagOslWriteCircularQilmptrreeInterTaskMsgqueueNode}}}AccessRecordInt结:9REQNVRAMTASK,等待RSP消息,得到读取数据.S32WriteValueInt(U8nDataItemId,void*pBuffer,U8nDataType,S16*pError,S8*fileName,er{ataType{DSBYTE{/*secondtimeaccess,italwayssetstherequestitem*/teDataReadFlag{/*DataiscachednoneedtoreadfromNVRAM*/memcpybyte_data[nDataItemId*nDataType],pBuffer,nDataType);/*writeintoNVRAMmodule,ifnotwaitforfalshingdirectly*/yteDataWriteFlashFlag{riteRecordIntNVRAM_EF_CACHE_BYTE_LID,byte_data,NVRAM_CACHE_SIZE,umber}DSBYTErorNVRAMWRITESUCCESS}//还没有读到CCACHE/*processfirsttimeaccessalldataandreturnfirstwriteitemdata*/{CACHE//那就读到CACHE/*ReadalldatafromtheNVRAMfile*/eadRecordIntNVRAM_EF_CACHE_BYTE_LID,byte_data,NVRAM_CACHE_SIZE,umbermemcpybyte_data[nDataItemId*nDataType],pBuffer,nDataType);/读好了,就写吧/*writeintoNVRAMmodule,ifnotwaitforfalshingdirectly*/yteDataWriteFlashFlag{riteRecordIntNVRAM_EF_CACHE_BYTE_LID,byte_data,NVRAM_CACHE_SIZE,umber}byteDataReadFlag=1;DSBYTErorNVRAMWRITESUCCESS}break;EndofcaseDS_BYTE*/DSSHORT{EndofcaseDS_SHORT*/SDOUBLE{EndofcaseDS_DOUBLE*/}}SWriteRecord