WebSVN – DashDisplay – Blame – /trunk/eeprom_lib/eeprom.c

Rev	Author	Line No.	Line
16	mjames	1	/**
		2	******************************************************************************
		3	* @file EEPROM_Emulation/src/eeprom.c
		4	* @author MCD Application Team
		5	* @version V3.1.0
		6	* @date 07/27/2009
		7	* @brief This file provides all the EEPROM emulation firmware functions.
		8	******************************************************************************
		9	* @copy
		10	*
		11	* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
		12	* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
		13	* TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
		14	* DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
		15	* FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
		16	* CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
		17	*
		18	* <h2><center>© COPYRIGHT 2009 STMicroelectronics</center></h2>
		19	*/
		20	/** @addtogroup EEPROM_Emulation
		21	* @{
		22	*/
		23
		24	/* Includes ------------------------------------------------------------------*/
		25	#include "eeprom.h"
		26
		27	/* Private typedef -----------------------------------------------------------*/
		28	/* Private define ------------------------------------------------------------*/
		29	/* Private macro -------------------------------------------------------------*/
		30	/* Private variables ---------------------------------------------------------*/
		31
		32
		33	FlashPage_t __attribute__((section(".EEPROM_Data"))) FlashPage[2];
		34
18	mjames	35	static FLASH_EraseInitTypeDef EraseInitStruct;
		36	static uint32_t PAGEError;
16	mjames	37
18	mjames	38
16	mjames	39	/* Global variable used to store variable value in read sequence */
		40	uint16_t DataVar = 0;
		41
		42	/* Virtual address defined by the user: 0xFFFF value is prohibited */
		43	extern uint16_t VirtAddVarTab[NumbOfVar];
		44
		45	/* Private function prototypes -----------------------------------------------*/
		46	/* Private functions ---------------------------------------------------------*/
		47	static FLASH_Status EE_Format(void);
		48	static uint16_t EE_FindValidPage(uint8_t Operation);
		49	static uint16_t EE_VerifyPageFullWriteVariable(uint16_t VirtAddress, uint16_t Data);
		50	static uint16_t EE_PageTransfer(uint16_t VirtAddress, uint16_t Data);
		51
22	mjames	52
		53	static uint16_t EE_ErasePages(uint32_t base,int count)
		54	{
		55	uint16_t FlashStatus;
		56	EraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES;
		57	EraseInitStruct.PageAddress = base;
		58	EraseInitStruct.NbPages = count;
		59	if (HAL_FLASHEx_Erase(&EraseInitStruct, &PAGEError) != HAL_OK)
		60	{
		61	/* If erase operation was failed, a Flash error code is returned */
		62	FlashStatus = HAL_FLASH_GetError();
		63	return FlashStatus;
		64	}
		65	return HAL_FLASH_ERROR_NONE;
		66
		67	}
16	mjames	68	/**
		69	* @brief Restore the pages to a known good state in case of page's status
		70	* corruption after a power loss.
		71	* @param None.
		72	* @retval - Flash error code: on write Flash error
		73	* - FLASH_COMPLETE: on success
		74	*/
		75	uint16_t EE_Init(void)
		76	{
		77	uint16_t PageStatus0 = 6, PageStatus1 = 6;
		78	uint16_t VarIdx = 0;
		79	uint16_t EepromStatus = 0, ReadStatus = 0;
		80	int16_t x = -1;
		81	uint16_t FlashStatus;
		82
		83	/* Get Page0 status */
		84	PageStatus0 = ((__IO uint16_t)PAGE0_BASE_ADDRESS);
		85	/* Get Page1 status */
		86	PageStatus1 = ((__IO uint16_t)PAGE1_BASE_ADDRESS);
		87
		88	/* Check for invalid header states and repair if necessary */
		89	switch (PageStatus0)
		90	{
		91	case ERASED:
		92	if (PageStatus1 == VALID_PAGE) /* Page0 erased, Page1 valid */
		93	{
		94	/* Erase Page0 */
22	mjames	95	FlashStatus = EE_ErasePages(PAGE0_BASE_ADDRESS,1);
		96	if(FlashStatus!=HAL_FLASH_ERROR_NONE)
		97	{
		98	return FlashStatus;
		99	}
16	mjames	100	}
		101	else if (PageStatus1 == RECEIVE_DATA) /* Page0 erased, Page1 receive */
		102	{
		103	/* Erase Page0 */
22	mjames	104	FlashStatus = EE_ErasePages(PAGE0_BASE_ADDRESS,1);
		105	if(FlashStatus!=HAL_FLASH_ERROR_NONE)
		106	{
		107	return FlashStatus;
		108	}
18	mjames	109	/* Mark Page1 as valid */
16	mjames	110
18	mjames	111	HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD,PAGE1_BASE_ADDRESS, VALID_PAGE);
16	mjames	112	/* If program operation was failed, a Flash error code is returned */
18	mjames	113	FlashStatus = HAL_FLASH_GetError();
		114	if (FlashStatus != HAL_FLASH_ERROR_NONE)
		115	{
16	mjames	116	return FlashStatus;
		117	}
		118	}
		119	else /* First EEPROM access (Page0&1 are erased) or invalid state -> format EEPROM */
		120	{
		121	/* Erase both Page0 and Page1 and set Page0 as valid page */
		122	FlashStatus = EE_Format();
		123	/* If erase/program operation was failed, a Flash error code is returned */
		124	if (FlashStatus != HAL_FLASH_ERROR_NONE)
		125	{
18	mjames	126	return FlashStatus;
16	mjames	127	}
		128	}
		129	break;
		130
		131	case RECEIVE_DATA:
		132	if (PageStatus1 == VALID_PAGE) /* Page0 receive, Page1 valid */
		133	{
		134	/* Transfer data from Page1 to Page0 */
		135	for (VarIdx = 0; VarIdx < NumbOfVar; VarIdx++)
		136	{
		137	if (( (__IO uint16_t)(PAGE0_BASE_ADDRESS + 6)) == VirtAddVarTab[VarIdx])
		138	{
		139	x = VarIdx;
		140	}
		141	if (VarIdx != x)
		142	{
		143	/* Read the last variables' updates */
		144	ReadStatus = EE_ReadVariable(VirtAddVarTab[VarIdx], &DataVar);
		145	/* In case variable corresponding to the virtual address was found */
		146	if (ReadStatus != 0x1)
		147	{
		148	/* Transfer the variable to the Page0 */
		149	EepromStatus = EE_VerifyPageFullWriteVariable(VirtAddVarTab[VarIdx], DataVar);
		150	/* If program operation was failed, a Flash error code is returned */
		151	if (EepromStatus != HAL_FLASH_ERROR_NONE)
		152	{
		153	return EepromStatus;
		154	}
		155	}
		156	}
		157	}
		158	/* Mark Page0 as valid */
		159	HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD,PAGE0_BASE_ADDRESS, VALID_PAGE);
		160	/* If program operation was failed, a Flash error code is returned */
		161	FlashStatus = HAL_FLASH_GetError();
		162	if (FlashStatus != HAL_FLASH_ERROR_NONE)
		163	{
		164	return FlashStatus;
		165	}
		166	/* Erase Page1 */
22	mjames	167	FlashStatus = EE_ErasePages(PAGE1_BASE_ADDRESS,1);
		168	if(FlashStatus!=HAL_FLASH_ERROR_NONE)
		169	{
		170	return FlashStatus;
		171	}
		172
16	mjames	173	}
		174	else if (PageStatus1 == ERASED) /* Page0 receive, Page1 erased */
		175	{
		176	/* Erase Page1 */
22	mjames	177	FlashStatus = EE_ErasePages(PAGE1_BASE_ADDRESS,1);
		178	if(FlashStatus!=HAL_FLASH_ERROR_NONE)
		179	{
		180	return FlashStatus;
		181	}
		182	/* Mark Page0 as valid */
16	mjames	183	HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD,PAGE0_BASE_ADDRESS, VALID_PAGE);
		184
		185	/* If program operation was failed, a Flash error code is returned */
		186	FlashStatus = HAL_FLASH_GetError();
		187	if (FlashStatus != HAL_FLASH_ERROR_NONE)
		188	{
		189	return FlashStatus;
		190	}
		191	}
		192	else /* Invalid state -> format eeprom */
		193	{
		194	/* Erase both Page0 and Page1 and set Page0 as valid page */
		195	FlashStatus = EE_Format();
		196	/* If erase/program operation was failed, a Flash error code is returned */
		197	if (FlashStatus != HAL_FLASH_ERROR_NONE)
		198	{
		199	return FlashStatus;
		200	}
		201	}
		202	break;
		203
		204	case VALID_PAGE:
		205	if (PageStatus1 == VALID_PAGE) /* Invalid state -> format eeprom */
		206	{
		207	/* Erase both Page0 and Page1 and set Page0 as valid page */
		208	FlashStatus = EE_Format();
		209	/* If erase/program operation was failed, a Flash error code is returned */
		210	if (FlashStatus != HAL_FLASH_ERROR_NONE)
		211	{
		212	return FlashStatus;
		213	}
		214	}
		215	else if (PageStatus1 == ERASED) /* Page0 valid, Page1 erased */
		216	{
		217	/* Erase Page1 */
22	mjames	218	FlashStatus = EE_ErasePages(PAGE1_BASE_ADDRESS,1);
		219	if(FlashStatus!=HAL_FLASH_ERROR_NONE)
		220	{
		221	return FlashStatus;
		222	}
		223
16	mjames	224	}
		225	else /* Page0 valid, Page1 receive */
		226	{
		227	/* Transfer data from Page0 to Page1 */
		228	for (VarIdx = 0; VarIdx < NumbOfVar; VarIdx++)
		229	{
		230	if (((__IO uint16_t)(PAGE1_BASE_ADDRESS + 6)) == VirtAddVarTab[VarIdx])
		231	{
		232	x = VarIdx;
		233	}
		234	if (VarIdx != x)
		235	{
		236	/* Read the last variables' updates */
		237	ReadStatus = EE_ReadVariable(VirtAddVarTab[VarIdx], &DataVar);
		238	/* In case variable corresponding to the virtual address was found */
		239	if (ReadStatus != 0x1)
		240	{
		241	/* Transfer the variable to the Page1 */
		242	EepromStatus = EE_VerifyPageFullWriteVariable(VirtAddVarTab[VarIdx], DataVar);
		243	/* If program operation was failed, a Flash error code is returned */
		244	if (EepromStatus != HAL_FLASH_ERROR_NONE)
		245	{
		246	return EepromStatus;
		247	}
		248	}
		249	}
		250	}
		251	/* Mark Page1 as valid */
		252
		253	HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD,PAGE1_BASE_ADDRESS, VALID_PAGE);
		254	/* If program operation was failed, a Flash error code is returned */
		255	FlashStatus = HAL_FLASH_GetError();
		256	if (FlashStatus != HAL_FLASH_ERROR_NONE)
		257	{
		258	return FlashStatus;
		259	}
		260	/* Erase Page0 */
22	mjames	261	FlashStatus = EE_ErasePages(PAGE0_BASE_ADDRESS,1);
		262	if(FlashStatus!=HAL_FLASH_ERROR_NONE)
		263	{
		264	return FlashStatus;
		265	}
16	mjames	266	}
		267	break;
		268
		269	default: /* Any other state -> format eeprom */
		270	/* Erase both Page0 and Page1 and set Page0 as valid page */
		271	FlashStatus = EE_Format();
		272	/* If erase/program operation was failed, a Flash error code is returned */
		273	if (FlashStatus != HAL_FLASH_ERROR_NONE)
		274	{
		275	return FlashStatus;
		276	}
		277	break;
		278	}
		279
		280	return HAL_FLASH_ERROR_NONE;
		281	}
		282
		283	/**
		284	* @brief Returns the last stored variable data, if found, which correspond to
		285	* the passed virtual address
		286	* @param VirtAddress: Variable virtual address
		287	* @param Data: Global variable contains the read variable value
		288	* @retval Success or error status:
		289	* - 0: if variable was found
		290	* - 1: if the variable was not found
		291	* - NO_VALID_PAGE: if no valid page was found.
		292	*/
		293	uint16_t EE_ReadVariable(uint16_t VirtAddress, uint16_t* Data)
		294	{
		295	uint16_t ValidPage = PAGE0;
		296	uint16_t AddressValue = 0x5555, ReadStatus = 1;
		297	uint32_t Address = 0x08010000, PageStartAddress = 0x08010000;
		298
		299	/* Get active Page for read operation */
		300	ValidPage = EE_FindValidPage(READ_FROM_VALID_PAGE);
		301
		302	/* Check if there is no valid page */
		303	if (ValidPage == NO_VALID_PAGE)
		304	{
		305	return NO_VALID_PAGE;
		306	}
		307
		308	/* Get the valid Page start Address */
		309	PageStartAddress = (uint32_t)(PAGE0_BASE_ADDRESS + (uint32_t)(ValidPage * PAGE_SIZE));
		310
		311	/* Get the valid Page end Address */
		312	Address = (uint32_t)((PAGE0_BASE_ADDRESS - 2) + (uint32_t)((1 + ValidPage) * PAGE_SIZE));
		313
		314	/* Check each active page address starting from end */
		315	while (Address > (PageStartAddress + 2))
		316	{
		317	/* Get the current location content to be compared with virtual address */
		318	AddressValue = ((__IO uint16_t)Address);
		319
		320	/* Compare the read address with the virtual address */
		321	if (AddressValue == VirtAddress)
		322	{
		323	/* Get content of Address-2 which is variable value */
		324	Data = ((__IO uint16_t*)(Address - 2));
		325
		326	/* In case variable value is read, reset ReadStatus flag */
		327	ReadStatus = 0;
		328
		329	break;
		330	}
		331	else
		332	{
		333	/* Next address location */
		334	Address = Address - 4;
		335	}
		336	}
		337
		338	/* Return ReadStatus value: (0: variable exist, 1: variable doesn't exist) */
		339	return ReadStatus;
		340	}
		341
		342	/**
		343	* @brief Writes/upadtes variable data in EEPROM.
		344	* @param VirtAddress: Variable virtual address
		345	* @param Data: 16 bit data to be written
		346	* @retval Success or error status:
		347	* - FLASH_COMPLETE: on success
		348	* - PAGE_FULL: if valid page is full
		349	* - NO_VALID_PAGE: if no valid page was found
		350	* - Flash error code: on write Flash error
		351	*/
		352	uint16_t EE_WriteVariable(uint16_t VirtAddress, uint16_t Data)
		353	{
		354	uint16_t Status = 0;
		355
		356	/* Write the variable virtual address and value in the EEPROM */
		357	Status = EE_VerifyPageFullWriteVariable(VirtAddress, Data);
		358
		359	/* In case the EEPROM active page is full */
		360	if (Status == PAGE_FULL)
		361	{
		362	/* Perform Page transfer */
		363	Status = EE_PageTransfer(VirtAddress, Data);
		364	}
		365
		366	/* Return last operation status */
		367	return Status;
		368	}
		369
		370	/**
		371	* @brief Erases PAGE0 and PAGE1 and writes VALID_PAGE header to PAGE0
		372	* @param None
		373	* @retval Status of the last operation (Flash write or erase) done during
		374	* EEPROM formating
		375	*/
18	mjames	376
16	mjames	377	static FLASH_Status EE_Format(void)
		378	{
		379	FLASH_Status FlashStatus = HAL_FLASH_ERROR_NONE;
		380
18	mjames	381	/* Erase Page0 and Page1 */
22	mjames	382	FlashStatus = EE_ErasePages(PAGE0_BASE_ADDRESS,1);
		383	if(FlashStatus!=HAL_FLASH_ERROR_NONE)
		384	{
18	mjames	385	return FlashStatus;
22	mjames	386	}
16	mjames	387
		388	/* Set Page0 as valid page: Write VALID_PAGE at Page0 base address */
18	mjames	389	uint32_t rc = HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD,PAGE0_BASE_ADDRESS, VALID_PAGE);
16	mjames	390	/* If program operation was failed, a Flash error code is returned */
18	mjames	391
22	mjames	392
		393
		394
18	mjames	395	if (rc!= HAL_OK)
16	mjames	396	{
18	mjames	397	FlashStatus = HAL_FLASH_GetError();
		398	return FlashStatus;
16	mjames	399	}
		400
22	mjames	401	FlashStatus = EE_ErasePages(PAGE1_BASE_ADDRESS,1);
		402	if(FlashStatus!=HAL_FLASH_ERROR_NONE)
		403	{
		404	return FlashStatus;
		405	}
		406
		407
16	mjames	408	/* Return Page1 erase operation status */
		409	return FlashStatus;
		410	}
		411
		412	/**
		413	* @brief Find valid Page for write or read operation
		414	* @param Operation: operation to achieve on the valid page.
		415	* This parameter can be one of the following values:
		416	* @arg READ_FROM_VALID_PAGE: read operation from valid page
		417	* @arg WRITE_IN_VALID_PAGE: write operation from valid page
		418	* @retval Valid page number (PAGE0 or PAGE1) or NO_VALID_PAGE in case
		419	* of no valid page was found
		420	*/
		421	static uint16_t EE_FindValidPage(uint8_t Operation)
		422	{
		423	uint16_t PageStatus0 = 6, PageStatus1 = 6;
		424
		425	/* Get Page0 actual status */
		426	PageStatus0 = ((__IO uint16_t)PAGE0_BASE_ADDRESS);
		427
		428	/* Get Page1 actual status */
		429	PageStatus1 = ((__IO uint16_t)PAGE1_BASE_ADDRESS);
		430
		431	/* Write or read operation */
		432	switch (Operation)
		433	{
		434	case WRITE_IN_VALID_PAGE: /* ---- Write operation ---- */
		435	if (PageStatus1 == VALID_PAGE)
		436	{
		437	/* Page0 receiving data */
		438	if (PageStatus0 == RECEIVE_DATA)
		439	{
		440	return PAGE0; /* Page0 valid */
		441	}
		442	else
		443	{
		444	return PAGE1; /* Page1 valid */
		445	}
		446	}
		447	else if (PageStatus0 == VALID_PAGE)
		448	{
		449	/* Page1 receiving data */
		450	if (PageStatus1 == RECEIVE_DATA)
		451	{
		452	return PAGE1; /* Page1 valid */
		453	}
		454	else
		455	{
		456	return PAGE0; /* Page0 valid */
		457	}
		458	}
		459	else
		460	{
		461	return NO_VALID_PAGE; /* No valid Page */
		462	}
		463
		464	case READ_FROM_VALID_PAGE: /* ---- Read operation ---- */
		465	if (PageStatus0 == VALID_PAGE)
		466	{
		467	return PAGE0; /* Page0 valid */
		468	}
		469	else if (PageStatus1 == VALID_PAGE)
		470	{
		471	return PAGE1; /* Page1 valid */
		472	}
		473	else
		474	{
		475	return NO_VALID_PAGE ; /* No valid Page */
		476	}
		477
		478	default:
		479	return PAGE0; /* Page0 valid */
		480	}
		481	}
		482
		483	/**
		484	* @brief Verify if active page is full and Writes variable in EEPROM.
		485	* @param VirtAddress: 16 bit virtual address of the variable
		486	* @param Data: 16 bit data to be written as variable value
		487	* @retval Success or error status:
		488	* - FLASH_COMPLETE: on success
		489	* - PAGE_FULL: if valid page is full
		490	* - NO_VALID_PAGE: if no valid page was found
		491	* - Flash error code: on write Flash error
		492	*/
		493	static uint16_t EE_VerifyPageFullWriteVariable(uint16_t VirtAddress, uint16_t Data)
		494	{
		495	FLASH_Status FlashStatus = HAL_FLASH_ERROR_NONE;
		496	uint16_t ValidPage = PAGE0;
		497	uint32_t Address = 0x08010000, PageEndAddress = 0x080107FF;
		498
		499	/* Get valid Page for write operation */
		500	ValidPage = EE_FindValidPage(WRITE_IN_VALID_PAGE);
		501
		502	/* Check if there is no valid page */
		503	if (ValidPage == NO_VALID_PAGE)
		504	{
		505	return NO_VALID_PAGE;
		506	}
		507
		508	/* Get the valid Page start Address */
		509	Address = (uint32_t)(PAGE0_BASE_ADDRESS + (uint32_t)(ValidPage * PAGE_SIZE));
		510
		511	/* Get the valid Page end Address */
		512	PageEndAddress = (uint32_t)((PAGE0_BASE_ADDRESS - 2) + (uint32_t)((1 + ValidPage) * PAGE_SIZE));
		513
		514	/* Check each active page address starting from begining */
		515	while (Address < PageEndAddress)
		516	{
		517	/* Verify if Address and Address+2 contents are 0xFFFFFFFF */
		518	if (((__IO uint32_t)Address) == 0xFFFFFFFF)
		519	{
		520	/* Set variable data */
		521	HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD,Address, Data);
		522	/* If program operation was failed, a Flash error code is returned */
		523	FlashStatus = HAL_FLASH_GetError();
		524	if (FlashStatus != HAL_FLASH_ERROR_NONE)
		525	{
		526	return FlashStatus;
		527	}
		528	/* Set variable virtual address */
		529	HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD,Address + 2 ,VirtAddress);
		530	/* If program operation was failed, a Flash error code is returned */
		531	FlashStatus = HAL_FLASH_GetError();
		532	/* Return program operation status */
		533	return FlashStatus;
		534	}
		535	else
		536	{
		537	/* Next address location */
		538	Address = Address + 4;
		539	}
		540	}
		541
		542	/* Return PAGE_FULL in case the valid page is full */
		543	return PAGE_FULL;
		544	}
		545
		546	/**
		547	* @brief Transfers last updated variables data from the full Page to
		548	* an empty one.
		549	* @param VirtAddress: 16 bit virtual address of the variable
		550	* @param Data: 16 bit data to be written as variable value
		551	* @retval Success or error status:
		552	* - FLASH_COMPLETE: on success
		553	* - PAGE_FULL: if valid page is full
		554	* - NO_VALID_PAGE: if no valid page was found
		555	* - Flash error code: on write Flash error
		556	*/
		557	static uint16_t EE_PageTransfer(uint16_t VirtAddress, uint16_t Data)
		558	{
		559	FLASH_Status FlashStatus = HAL_FLASH_ERROR_NONE;
		560	uint32_t NewPageAddress = 0x080103FF, OldPageAddress = 0x08010000;
		561	uint16_t ValidPage = PAGE0, VarIdx = 0;
		562	uint16_t EepromStatus = 0, ReadStatus = 0;
		563
		564	/* Get active Page for read operation */
		565	ValidPage = EE_FindValidPage(READ_FROM_VALID_PAGE);
		566
		567	if (ValidPage == PAGE1) /* Page1 valid */
		568	{
		569	/* New page address where variable will be moved to */
		570	NewPageAddress = PAGE0_BASE_ADDRESS;
		571
		572	/* Old page address where variable will be taken from */
		573	OldPageAddress = PAGE1_BASE_ADDRESS;
		574	}
		575	else if (ValidPage == PAGE0) /* Page0 valid */
		576	{
		577	/* New page address where variable will be moved to */
		578	NewPageAddress = PAGE1_BASE_ADDRESS;
		579
		580	/* Old page address where variable will be taken from */
		581	OldPageAddress = PAGE0_BASE_ADDRESS;
		582	}
		583	else
		584	{
		585	return NO_VALID_PAGE; /* No valid Page */
		586	}
		587
		588	/* Set the new Page status to RECEIVE_DATA status */
		589	HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD,NewPageAddress,RECEIVE_DATA);
		590	FlashStatus = HAL_FLASH_GetError();
		591	/* If program operation was failed, a Flash error code is returned */
		592	if (FlashStatus != HAL_FLASH_ERROR_NONE)
		593	{
		594	return FlashStatus;
		595	}
		596
		597	/* Write the variable passed as parameter in the new active page */
		598	EepromStatus = EE_VerifyPageFullWriteVariable(VirtAddress, Data);
		599	/* If program operation was failed, a Flash error code is returned */
		600	if (EepromStatus != HAL_FLASH_ERROR_NONE)
		601	{
		602	return EepromStatus;
		603	}
		604
		605	/* Transfer process: transfer variables from old to the new active page */
		606	for (VarIdx = 0; VarIdx < NumbOfVar; VarIdx++)
		607	{
		608	if (VirtAddVarTab[VarIdx] != VirtAddress) /* Check each variable except the one passed as parameter */
		609	{
		610	/* Read the other last variable updates */
		611	ReadStatus = EE_ReadVariable(VirtAddVarTab[VarIdx], &DataVar);
		612	/* In case variable corresponding to the virtual address was found */
		613	if (ReadStatus != 0x1)
		614	{
		615	/* Transfer the variable to the new active page */
		616	EepromStatus = EE_VerifyPageFullWriteVariable(VirtAddVarTab[VarIdx], DataVar);
		617	/* If program operation was failed, a Flash error code is returned */
		618	if (EepromStatus != HAL_FLASH_ERROR_NONE)
		619	{
		620	return EepromStatus;
		621	}
		622	}
		623	}
		624	}
		625
		626	/* Erase the old Page: Set old Page status to ERASED status */
22	mjames	627	FlashStatus = EE_ErasePages(OldPageAddress,1);
		628	if(FlashStatus!=HAL_FLASH_ERROR_NONE)
		629	{
		630	return FlashStatus;
		631	}
16	mjames	632
		633	/* Set new Page status to VALID_PAGE status */
		634	HAL_FLASH_Program(FLASH_TYPEPROGRAM_HALFWORD,NewPageAddress, VALID_PAGE);
		635	/* If program operation was failed, a Flash error code is returned */
		636	FlashStatus = HAL_FLASH_GetError();
		637	if (FlashStatus != HAL_FLASH_ERROR_NONE)
		638	{
		639	return FlashStatus;
		640	}
		641
		642	/* Return last operation flash status */
		643	return FlashStatus;
		644	}
		645
		646	/**
		647	* @}
		648	*/
		649
		650	/***************** (C) COPYRIGHT 2009 STMicroelectronics *END OF FILE**/

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(root)/trunk/eeprom_lib/eeprom.c – Rev 22