Freescale 9S12 系列单片机应用笔记（EETS4K模块） 1

时间：11-20 来源：互联网点击：

EEPROM
*@paramaddress,thestartofthe4-bytesectortoaddress
*@return
*NVM_NO_ERR-EEPROMWriteSuccess
*NVM_ODD_ACCESS_ERR-EEPROMWriteError,Addressnotonanevenaddressboundry
*NVM_ACCESS_ERR-EEPROMWriteError,AccessViolation
*NVM_PROTECTION_ERR-EEPROMWriteError,Attemptedtowriteaprotectedsector
*/
charEEPROM_Erase_Sector(unsignedintaddress)
{
while(!ESTAT_CBEIF){/*WaitforEEPROMaccesscontrollertobecomeready*/
;
}
ESTAT=(ESTAT_ACCERR_MASK|ESTAT_PVIOL_MASK);/*Clearexistingerrorflags*/
if(address&0x0001){
return(NVM_ODD_ACCESS_ERR);/*AddressisNOTalignedonanevenboundry?*/
}
(*(unsignedint*)address)=0xFFFF;/*Writethedatatothespecifiedaddress*/
ECMD=ECMD_CMDB6_MASK;/*StoreprogrammingcommandinFCMD*/
ESTAT_CBEIF=1;/*Executethecommand*/
if(ESTAT_ACCERR){/*Checkiftherehasbeenanaccesserror*/
return(NVM_ACCESS_ERR);/*ReturnanAccessErrorcode*/
}
if(ESTAT_PVIOL){/*Checkiftherehasbeenaprotectionerror*/
return(NVM_PROTECTION_ERR);/*ReturnaProtectionErrorcode*/
}
return(NVM_NO_ERR);/*ReturnNoError*/
}
charEEPROM_Erase_All(void)
{
while(!ESTAT_CBEIF){/*WaitforEEPROMaccesscontrollertobecomeready*/
;
}
ESTAT=(ESTAT_ACCERR_MASK|ESTAT_PVIOL_MASK);/*Clearexistingerrorflags*/
(*(unsignedint*)0x0400)=0xFFFF;/*Writethedatatothespecifiedaddress*/
ECMD=0x41;/*StoreprogrammingcommandinFCMD*/
ESTAT_CBEIF=1;/*Executethecommand*/
if(ESTAT_ACCERR){/*Checkiftherehasbeenanaccesserror*/
return(NVM_ACCESS_ERR);/*ReturnanAccessErrorcode*/
}
if(ESTAT_PVIOL){/*Checkiftherehasbeenaprotectionerror*/
return(NVM_PROTECTION_ERR);/*ReturnaProtectionErrorcode*/
}
return(NVM_NO_ERR);/*ReturnNoError*/
}
/**@briefThisfunctionreadsa16-bitwordfromthespecifiedaddressinEEPROM
*@paramaddress,thestartofthe16-bitdatatoread
*@returnThe16-bitwordstoredinlocationaddress
*/
unsignedintEEPROM_Read_Word(unsignedintaddress)
{
unsignedintdata;
while(!ESTAT_CBEIF){/*WaitforEEPROMaccesscontrollertobecomeready*/
;
}
data=(*(unsignedint*)address);/*Readthedataatlocationaddress*/
return(data);/*Returnthedata*/
}

#include/*commondefinesandmacros*/
#include"derivative.h"/*derivative-specificdefinitions*/
#include"sci.h"
#include"eets4k.h"
voidmain(void)
{
unsignedintdata;
EEPROM_Init(16384);
EnableInterrupts;
EEPROM_Erase_All();
EEPROM_Write_Word(0x400,1234);
data=EEPROM_Read_Word(0x400);
for(;;)
{
_FEED_COP();/*feedsthedog*/
}/*loopforever*/
}

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