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/**************************************************************************************************
Filename: OSAL_Nv.c
Revised: $Date: 2008-08-06 17:17:11 -0700 (Wed, 06 Aug 2008) $
Revision: $Revision: 17715 $
Description: This module contains the OSAL non-volatile memory functions.
Copyright 2006-2009 Texas Instruments Incorporated. All rights reserved.
IMPORTANT: Your use of this Software is limited to those specific rights
granted under the terms of a software license agreement between the user
who downloaded the software, his/her employer (which must be your employer)
and Texas Instruments Incorporated (the "License"). You may not use this
Software unless you agree to abide by the terms of the License. The License
limits your use, and you acknowledge, that the Software may not be modified,
copied or distributed unless embedded on a Texas Instruments microcontroller
or used solely and exclusively in conjunction with a Texas Instruments radio
frequency transceiver, which is integrated into your product. Other than for
the foregoing purpose, you may not use, reproduce, copy, prepare derivative
works of, modify, distribute, perform, display or sell this Software and/or
its documentation for any purpose.
YOU FURTHER ACKNOWLEDGE AND AGREE THAT THE SOFTWARE AND DOCUMENTATION ARE
PROVIDED 揂S IS?WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED,
INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY, TITLE,
NON-INFRINGEMENT AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL
TEXAS INSTRUMENTS OR ITS LICENSORS BE LIABLE OR OBLIGATED UNDER CONTRACT,
NEGLIGENCE, STRICT LIABILITY, CONTRIBUTION, BREACH OF WARRANTY, OR OTHER
LEGAL EQUITABLE THEORY ANY DIRECT OR INDIRECT DAMAGES OR EXPENSES
INCLUDING BUT NOT LIMITED TO ANY INCIDENTAL, SPECIAL, INDIRECT, PUNITIVE
OR CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA, COST OF PROCUREMENT
OF SUBSTITUTE GOODS, TECHNOLOGY, SERVICES, OR ANY CLAIMS BY THIRD PARTIES
(INCLUDING BUT NOT LIMITED TO ANY DEFENSE THEREOF), OR OTHER SIMILAR COSTS.
Should you have any questions regarding your right to use this Software,
contact Texas Instruments Incorporated at www.TI.com.
**************************************************************************************************/
/**************************************************************************************************
Notes:
- A trick buried deep in initPage() requires that the MSB of the NV Item Id is to
be reserved for use by this module.
**************************************************************************************************/
/*********************************************************************
* INCLUDES
*/
#include "hal_adc.h"
#include "hal_flash.h"
#include "hal_types.h"
#include "ZComdef.h"
#include "OSAL_Nv.h"
/*********************************************************************
* CONSTANTS
*/
#define OSAL_NV_PAGE_SIZE HAL_FLASH_PAGE_SIZE
#define OSAL_NV_PAGES_USED HAL_NV_PAGE_CNT
#define OSAL_NV_PAGE_BEG HAL_NV_PAGE_BEG
#define OSAL_NV_PAGE_END (OSAL_NV_PAGE_BEG + OSAL_NV_PAGES_USED - 1)
#define OSAL_NV_ACTIVE 0x00
#define OSAL_NV_ERASED 0xFF
#define OSAL_NV_ERASED_ID 0xFFFF
#define OSAL_NV_ZEROED_ID 0x0000
// Reserve MSB of Id to signal a search for the "old" source copy (new write interrupted/failed.)
#define OSAL_NV_SOURCE_ID 0x8000
#define OSAL_NV_PAGE_FREE HAL_FLASH_PAGE_SIZE
// In case pages 0-1 are ever used, define a null page value.
#define OSAL_NV_PAGE_NULL 0
// In case item Id 0 is ever used, define a null item value.
#define OSAL_NV_ITEM_NULL 0
#define OSAL_NV_WORD_SIZE HAL_FLASH_WORD_SIZE
#define OSAL_NV_PAGE_HDR_OFFSET 0
/*********************************************************************
* MACROS
*/
#define OSAL_NV_CHECK_BUS_VOLTAGE (HalAdcCheckVdd( HAL_ADC_VDD_LIMIT_4 ))
#define OSAL_NV_DATA_SIZE( LEN ) \
((((LEN) + OSAL_NV_WORD_SIZE - 1) / OSAL_NV_WORD_SIZE) * OSAL_NV_WORD_SIZE)
#define OSAL_NV_ITEM_SIZE( LEN ) \
(((((LEN) + OSAL_NV_WORD_SIZE - 1) / OSAL_NV_WORD_SIZE) * OSAL_NV_WORD_SIZE) + OSAL_NV_HDR_SIZE)
/*********************************************************************
* TYPEDEFS
*/
typedef struct
{
uint16 id;
uint16 len; // Enforce Flash-WORD size on len.
uint16 chk; // Byte-wise checksum of the 'len' data bytes of the item.
uint16 stat; // Item status.
} osalNvHdr_t;
// Struct member offsets.
#define OSAL_NV_HDR_ID 0
#define OSAL_NV_HDR_LEN 2
#define OSAL_NV_HDR_CHK 4
#define OSAL_NV_HDR_STAT 6
#define OSAL_NV_HDR_ITEM 2 // Length of any item of a header struct.
#define OSAL_NV_HDR_SIZE 8
#define OSAL_NV_HDR_HALF (OSAL_NV_HDR_SIZE / 2)
typedef struct
{
uint16 active;
uint16 inUse;
uint16 xfer;
uint16 spare;
} osalNvPgHdr_t;
// Struct member offsets.
#define OSAL_NV_PG_ACTIVE 0
#define OSAL_NV_PG_INUSE 2
#define OSAL_NV_PG_XFER 4
#define OSAL_NV_PG_SPARE 6
#define OSAL_NV_PAGE_HDR_SIZE 8
#define OSAL_NV_PAGE_HDR_HALF (OSAL_NV_PAGE_HDR_SIZE / 2)
typedef enum
{
eNvXfer,
eNvZero
} eNvHdrEnum;
typedef enum
{
ePgActive,
ePgInUse,
ePgXfer,
ePgSpare
} ePgHdrEnum;
/*********************************************************************
* EXTERNAL FUNCTIONS
*/
extern bool HalAdcCheckVdd(uint8 limit);
/*********************************************************************
* GLOBAL VARIABLES
*/
#ifndef OAD_KEEP_NV_PAGES
// When NV pages are to remain intact during OAD download,
// the image itself should not include NV pages.
#pragma location="ZIGNV_ADDRESS_SPACE"
__no_init uint8 _nvBuf[OSAL_NV_PAGES_USED * OSAL_NV_PAGE_SIZE];
#pragma required=_nvBuf
#pragma location="IEEE_ADDRESS_SPACE"
__no_init uint8 _nvIEEE[Z_EXTADDR_LEN];
#pragma required=_nvIEEE
#endif // OAD_KEEP_NV_PAGES
/*********************************************************************
* LOCAL VARIABLES
*/
// Offset into the page of the first available erased space.
static uint16 pgOff[OSAL_NV_PAGES_USED];
// Count of the bytes lost for the zeroed-out items.
static uint16 pgLost[OSAL_NV_PAGES_USED];
static uint8 pgRes; // Page reserved for item compacting transfer.
// Saving ~100 code bytes to move a uint8* parameter/return value from findItem() to a global.
static uint8 findPg;
/* Immediately before the voltage critical operations of a page erase or
* a word write, check bus voltage. If less than min, set global flag & abort.
* Since this is to be done at the lowest level, many void functions would have to be changed to
* return a value and code added to check that value before proceeding, resulting in a very
* expensive code size hit for implementing this properly. Therefore, use this global as follows:
* at the start of osal_nv_item_init/osal_nv_write, set to FALSE, and at the end, before returning,
* check the value. Thus, the global is an accumulator of any error that occurred in any of the
* attempts to modify Flash with a low bus voltage during the complicated sequence of events that
* may occur on any item init or write. This is much more expedient and code saving than adding
* return values and checking return values to early out. No matter which method is used, an NV
* data record may end up mangled due to the low VCC conditions. The strategy is that the headers
* and checksums will detect and allow recovery from such a condition.
*
* One unfortunate side-effect of using the global fail flag vice adding and checking return
* values, is that when setting an item Id to zero has failed due to the low VCC check,
* the page lost-bytes counter is still updated. Having an artificially high lost-byte
* count makes it look like there are more bytes to recover from compacting a page than there may
* actually be. The easy work-around implemented is it to invoke initNV() from osal_nv_item_init or
* osal_nv_write anytime that the failF gets set - this will re-walk all of the pages and set the
* page offset count and page lost bytes count to their actual values.
*/
static uint8 failF;
/*********************************************************************
* LOCAL FUNCTIONS
*/
static uint8 initNV( void );
static void setPageUse( uint8 pg, uint8 inUse );
static uint16 initPage( uint8 pg, uint16 id, uint8 findDups );
static void erasePage( uint8 pg );
static void compactPage( uint8 pg );
static uint16 findItem( uint16 id );
static uint8 initItem( uint8 flag, uint16 id, uint16 len, void *buf );
static void setItem( uint8 pg, uint16 offset, eNvHdrEnum stat );
static uint16 calcChkB( uint16 len, uint8 *buf );
static uint16 calcChkF( byte pg, uint16 offset, uint16 len );
static void writeWord( uint8 pg, uint16 offset, uint8 *buf );
static void writeWordH( uint8 pg, uint16 offset, uint8 *buf );
static void writeWordM( uint8 pg, uint16 offset, uint8 *buf, uint16 cnt );
static void writeBuf( uint8 pg, uint16 offset, uint16 len, uint8 *buf );
static void xferBuf( uint8 srcPg, uint16 srcOff, uint8 dstPg, uint16 dstOff, uint16 len );
static uint8 writeItem( uint8 pg, uint16 id, uint16 len, void *buf, uint8 flag );
/*********************************************************************
* @fn initNV
*
* @brief Initialize the NV flash pages.
*
* @param none
*
* @return TRUE
*/
static uint8 initNV( void )
{
osalNvPgHdr_t pgHdr;
uint8 oldPg = OSAL_NV_PAGE_NULL;
uint8 newPg = OSAL_NV_PAGE_NULL;
uint8 findDups = FALSE;
uint8 pg;
pgRes = OSAL_NV_PAGE_NULL;
for ( pg = OSAL_NV_PAGE_BEG; pg <= OSAL_NV_PAGE_END; pg++ )
{
HalFlashRead(pg, OSAL_NV_PAGE_HDR_OFFSET, (uint8 *)(&pgHdr), OSAL_NV_HDR_SIZE);
if ( pgHdr.active == OSAL_NV_ERASED_ID )
{
if ( pgRes == OSAL_NV_PAGE_NULL )
{
pgRes = pg;
}
else
{
setPageUse( pg, TRUE );
}
}
else // Page is active.
{
// If the page is not yet in use, it is the tgt of items from an xfer.
if ( pgHdr.inUse == OSAL_NV_ERASED_ID )
{
newPg = pg;
}
// An Xfer from this page was in progress.
else if ( pgHdr.xfer != OSAL_NV_ERASED_ID )
{
oldPg = pg;
}
}
// Calculate page offset and lost bytes - any "old" item triggers an N^2 re-scan from start.
if ( initPage( pg, OSAL_NV_ITEM_NULL, findDups ) != OSAL_NV_ITEM_NULL )
{
findDups = TRUE;
pg = OSAL_NV_PAGE_BEG-1;
continue;
}
} // for ( pg = OSAL_NV_PAGE_BEG; pg <= OSAL_NV_PAGE_END; pg++ )
/* First the old page is erased, and then the new page is put into use.
* So if a transfer was in progress, the new page will always not yet be
* marked as in use, since that is the last step to ending a transfer.
*/
if ( newPg != OSAL_NV_PAGE_NULL )
{
/* If there is already a fallow page reserved, keep it and put the newPg in use.
* An unfinished compaction will finish to the new reserve page and the old page
* will be erased and reserved.
*/
if ( pgRes != OSAL_NV_PAGE_NULL )
{
setPageUse( newPg, TRUE );
}
else if ( oldPg != OSAL_NV_PAGE_NULL )
{
pgRes = newPg;
}
/* If a page compaction was interrupted and the page being compacted is not
* yet erased, then there may be items remaining to xfer before erasing.
*/
if ( oldPg != OSAL_NV_PAGE_NULL )
{
compactPage( oldPg );
}
}
/* If no page met the criteria to be the reserve page:
* - A compactPage() failed or board reset before doing so.
* - Perhaps the user changed which Flash pages are dedicated to NV and downloaded the code
* without erasing Flash?
*/
if ( pgRes == OSAL_NV_PAGE_NULL )
{
for ( pg = OSAL_NV_PAGE_BEG; pg <= OSAL_NV_PAGE_END; pg++ )
{
erasePage( pg );
}
initNV();
}
return TRUE;
}
/*********************************************************************
* @fn setPageUse
*
* @brief Set page header active/inUse state according to 'inUse'.
*
* @param pg - Valid NV page to verify and init.
* @param inUse - Boolean TRUE if inUse, FALSE if only active.
*
* @return none
*/
static void setPageUse( uint8 pg, uint8 inUse )
{
osalNvPgHdr_t pgHdr;
pgHdr.active = OSAL_NV_ZEROED_ID;
if ( inUse )
{
pgHdr.inUse = OSAL_NV_ZEROED_ID;
}
else
{
pgHdr.inUse = OSAL_NV_ERASED_ID;
}
writeWord( pg, OSAL_NV_PAGE_HDR_OFFSET, (uint8*)(&pgHdr) );
}
/*********************************************************************
* @fn initPage
*
* @brief Walk the page items; calculate checksums, lost bytes & page offset.
*
* @param pg - Valid NV page to verify and init.
* @param id - Valid NV item Id to use function as a "findItem".
* If set to NULL then just perform the page initialization.
*
* @return If 'id' is non-NULL and good checksums are found, return the offset
* of the data corresponding to item Id; else OSAL_NV_ITEM_NULL.
*/
static uint16 initPage( uint8 pg, uint16 id, uint8 findDups )
{
uint16 offset = OSAL_NV_PAGE_HDR_SIZE;
uint16 sz, lost = 0;
osalNvHdr_t hdr;
do
{
HalFlashRead(pg, offset, (uint8 *)(&hdr), OSAL_NV_HDR_SIZE);
if ( hdr.id == OSAL_NV_ERASED_ID )
{
break;
}
offset += OSAL_NV_HDR_SIZE;
sz = OSAL_NV_DATA_SIZE( hdr.len );
// A bad 'len' write has blown away the rest of the page.
if ( (offset + sz) > OSAL_NV_PAGE_FREE )
{
lost += (OSAL_NV_PAGE_FREE - offset + OSAL_NV_HDR_SIZE);
offset = OSAL_NV_PAGE_FREE;
break;
}
if ( hdr.id != OSAL_NV_ZEROED_ID )
{
/* This trick allows function to do double duty for findItem() without
* compromising its essential functionality at powerup initialization.
*/
if ( id != OSAL_NV_ITEM_NULL )
{
/* This trick allows asking to find the old/transferred item in case
* of a successful new item write that gets interrupted before the
* old item can be zeroed out.
*/
if ( (id & 0x7fff) == hdr.id )
{
if ( (((id & OSAL_NV_SOURCE_ID) == 0) && (hdr.stat == OSAL_NV_ERASED_ID)) ||
(((id & OSAL_NV_SOURCE_ID) != 0) && (hdr.stat != OSAL_NV_ERASED_ID)) )
{
return offset;
}
}
}
// When invoked from the osal_nv_init(), verify checksums and find & zero any duplicates.
else
{
if ( hdr.chk == calcChkF( pg, offset, hdr.len ) )
{
if ( findDups )
{
if ( hdr.stat == OSAL_NV_ERASED_ID )
{
/* The trick of setting the MSB of the item Id causes the logic
* immediately above to return a valid page only if the header 'stat'
* indicates that it was the older item being transferred.
*/
uint16 off = findItem( (hdr.id | OSAL_NV_SOURCE_ID) );
if ( off != OSAL_NV_ITEM_NULL )
{
setItem( findPg, off, eNvZero ); // Mark old duplicate as invalid.
}
}
}
// Any "old" item immediately exits and triggers the N^2 exhaustive initialization.
else if ( hdr.stat != OSAL_NV_ERASED_ID )
{
return OSAL_NV_ERASED_ID;
}
}
else
{
setItem( pg, offset, eNvZero ); // Mark bad checksum as invalid.
lost += (OSAL_NV_HDR_SIZE + sz);
}
}
}
else
{
lost += (OSAL_NV_HDR_SIZE + sz);
}
offset += sz;
} while ( TRUE );
pgOff[pg - OSAL_NV_PAGE_BEG] = offset;
pgLost[pg - OSAL_NV_PAGE_BEG] = lost;
return OSAL_NV_ITEM_NULL;
}
/*********************************************************************
* @fn erasePage
*
* @brief Erases a page in Flash.
*
* @param pg - Valid NV page to erase.
*
* @return none
*/
static void erasePage( uint8 pg )
{
if ( !OSAL_NV_CHECK_BUS_VOLTAGE )
{
failF = TRUE;
return;
}
HalFlashErase(pg);
pgOff[pg - OSAL_NV_PAGE_BEG] = OSAL_NV_PAGE_HDR_SIZE;
pgLost[pg - OSAL_NV_PAGE_BEG] = 0;
}
/*********************************************************************
* @fn compactPage
*
* @brief Compacts the page specified.
*
* @param srcPg - Valid NV page to erase.
*
* @return none
*/
static void compactPage( uint8 srcPg )
{
uint16 dstOff = pgOff[pgRes-OSAL_NV_PAGE_BEG];
uint16 srcOff = OSAL_NV_ZEROED_ID;
osalNvHdr_t hdr;
// Mark page as being in process of compaction.
writeWordH( srcPg, OSAL_NV_PG_XFER, (uint8*)(&srcOff) );
srcOff = OSAL_NV_PAGE_HDR_SIZE;
do
{
uint16 sz;
HalFlashRead(srcPg, srcOff, (uint8 *)(&hdr), OSAL_NV_HDR_SIZE);
if ( hdr.id == OSAL_NV_ERASED_ID )
{
break;
}
srcOff += OSAL_NV_HDR_SIZE;
if ( (srcOff + hdr.len) > OSAL_NV_PAGE_FREE )
{
break;
}
sz = OSAL_NV_DATA_SIZE( hdr.len );
if ( hdr.id != OSAL_NV_ZEROED_ID )
{
if ( hdr.chk == calcChkF( srcPg, srcOff, hdr.len ) )
{
setItem( srcPg, srcOff, eNvXfer );
writeBuf( pgRes, dstOff, OSAL_NV_HDR_SIZE, (byte *)(&hdr) );
dstOff += OSAL_NV_HDR_SIZE;
xferBuf( srcPg, srcOff, pgRes, dstOff, sz );
dstOff += sz;
}
setItem( srcPg, srcOff, eNvZero ); // Mark old location as invalid.
}
srcOff += sz;
} while ( TRUE );
pgOff[pgRes-OSAL_NV_PAGE_BEG] = dstOff;
/* In order to recover from a page compaction that is interrupted,
* the logic in osal_nv_init() depends upon the following order:
* 1. Compacted page is erased.
* 2. State of the target of compaction is changed ePgActive to ePgInUse.
*/
erasePage( srcPg );
// Mark the reserve page as being in use.
setPageUse( pgRes, TRUE );
// Set the reserve page to be the newly erased page.
pgRes = srcPg;
}
/*********************************************************************
* @fn findItem
*
* @brief Find an item Id in NV and return the page and offset to its data.
*
* @param id - Valid NV item Id.
*
* @return Offset of data corresponding to item Id, if found;
* otherwise OSAL_NV_ITEM_NULL.
*
* The page containing the item, if found;
* otherwise no valid assignment made - left equal to item Id.
*
*/
static uint16 findItem( uint16 id )
{
uint16 off;
uint8 pg;
for ( pg = OSAL_NV_PAGE_BEG; pg <= OSAL_NV_PAGE_END; pg++ )
{
if ( (off = initPage( pg, id, FALSE )) != OSAL_NV_ITEM_NULL )
{
findPg = pg;
return off;
}
}
// Now attempt to find the item as the "old" item of a failed/interrupted NV write.
if ( (id & OSAL_NV_SOURCE_ID) == 0 )
{
return findItem( id | OSAL_NV_SOURCE_ID );
}
else
{
findPg = OSAL_NV_PAGE_NULL;
return OSAL_NV_ITEM_NULL;
}
}
/*********************************************************************
* @fn initItem
*
* @brief An NV item is created and initialized with the data passed to the function, if any.
*
* @param id - Valid NV item Id.
* @param len - Item data length.
* @param *buf - Pointer to item initalization data. Set to NULL if none.
*
* @return TRUE if item write and read back checksums ok; FALSE otherwise.
*/
static uint8 initItem( uint8 flag, uint16 id, uint16 len, void *buf )
{
uint16 sz = OSAL_NV_ITEM_SIZE( len );
uint8 rtrn = FALSE;
uint8 cnt = OSAL_NV_PAGES_USED;
uint8 pg = pgRes+1; // Set to 1 after the reserve page to even wear across all available pages.
uint8 idx = 0;
do {
if (pg >= OSAL_NV_PAGE_BEG+OSAL_NV_PAGES_USED)
{
pg = OSAL_NV_PAGE_BEG;
}
if ( pg != pgRes )
{
idx = pg - OSAL_NV_PAGE_BEG;
if ( (pgOff[idx] - pgLost[idx] + sz) <= OSAL_NV_PAGE_FREE )
{
break;
}
}
pg++;
} while (--cnt);
if (cnt)
{
// Item fits if an old page is compacted.
if ( (pgOff[idx] + sz) > OSAL_NV_PAGE_FREE )
{
pg = pgRes;
}
// New item is the first one written to the reserved page, then the old page is compacted.
rtrn = writeItem( pg, id, len, buf, flag );
if ( pg == pgRes )
{
if ( flag )
{
compactPage( OSAL_NV_PAGE_BEG+idx );
}
else
{
*(uint8 *)buf = OSAL_NV_PAGE_BEG+idx;
}
}
}
return rtrn;
}
/*********************************************************************
* @fn setItem
*
* @brief Set an item Id or status to mark its state.
*
* @param pg - Valid NV page.
* @param offset - Valid offset into the page of the item data - the header
* offset is calculated from this.
* @param stat - Valid enum value for the item status.
*
* @return none
*/
static void setItem( uint8 pg, uint16 offset, eNvHdrEnum stat )
{
osalNvHdr_t hdr;
offset -= OSAL_NV_HDR_SIZE;
HalFlashRead(pg, offset, (uint8 *)(&hdr), OSAL_NV_HDR_SIZE);
if ( stat == eNvXfer )
{
hdr.stat = OSAL_NV_ACTIVE;
writeWord( pg, offset+OSAL_NV_HDR_CHK, (uint8*)(&(hdr.chk)) );
}
else // if ( stat == eNvZero )
{
uint16 sz = ((hdr.len + (OSAL_NV_WORD_SIZE-1)) / OSAL_NV_WORD_SIZE) * OSAL_NV_WORD_SIZE +
OSAL_NV_HDR_SIZE;
hdr.id = 0;
writeWord( pg, offset, (uint8 *)(&hdr) );
pgLost[pg-OSAL_NV_PAGE_BEG] += sz;
}
}
/*********************************************************************
* @fn calcChkB
*
* @brief Calculates the data checksum over the 'buf' parameter.
*
* @param pg - A valid NV Flash page.
* @param offset - A valid offset into the page.
* @param len - Byte count of the data to be checksummed.
*
* @return Calculated checksum of the data bytes.
*/
static uint16 calcChkB( uint16 len, uint8 *buf )
{
uint8 fill = len % OSAL_NV_WORD_SIZE;
uint16 chk;
if ( !buf )
{
chk = len * OSAL_NV_ERASED;
}
else
{
chk = 0;
while ( len-- )
{
chk += *buf++;
}
}
// calcChkF() will calculate over OSAL_NV_WORD_SIZE alignment.
if ( fill )
{
chk += (OSAL_NV_WORD_SIZE - fill) * OSAL_NV_ERASED;
}
return chk;
}
/*********************************************************************
* @fn calcChkF
*
* @brief Calculates the data checksum by reading the data bytes from NV.
*
* @param pg - A valid NV Flash page.
* @param offset - A valid offset into the page.
* @param len - Byte count of the data to be checksummed.
*
* @return Calculated checksum of the data bytes.
*/
static uint16 calcChkF( byte pg, uint16 offset, uint16 len )
{
uint16 chk = 0;
len = (len + (OSAL_NV_WORD_SIZE-1)) / OSAL_NV_WORD_SIZE;
while ( len-- )
{
uint8 cnt, tmp[OSAL_NV_WORD_SIZE];
HalFlashRead(pg, offset, tmp, OSAL_NV_WORD_SIZE);
offset += OSAL_NV_WORD_SIZE;
for ( cnt = 0; cnt < OSAL_NV_WORD_SIZE; cnt++ )
{
chk += tmp[cnt];
}
}
return chk;
}
/*********************************************************************
* @fn writeWord
*
* @brief Writes a Flash-WORD to NV.
*
* @param pg - A valid NV Flash page.
* @param offset - A valid offset into the page.
* @param buf - Pointer to source buffer.
*
* @return none
*/
static void writeWord( uint8 pg, uint16 offset, uint8 *buf )
{
offset = (offset >> 2) + ((uint16)pg << 9);
if ( OSAL_NV_CHECK_BUS_VOLTAGE )
{
HalFlashWrite(offset, buf, 1);
}
else
{
failF = TRUE;
}
}
/*********************************************************************
* @fn writeWordM
*
* @brief Writes multiple Flash-WORDs to NV.
*
* @param pg - A valid NV Flash page.
* @param offset - A valid offset into the page.
* @param buf - Pointer to source buffer.
* @param cnt - Number of 4-byte blocks to write.
*
* @return none
*/
static void writeWordM( uint8 pg, uint16 offset, uint8 *buf, uint16 cnt )
{
offset = (offset >> 2) + ((uint16)pg << 9);
if ( OSAL_NV_CHECK_BUS_VOLTAGE )
{
HalFlashWrite(offset, buf, cnt);
}
else
{
failF = TRUE;
}
}
/*********************************************************************
* @fn writeWordH
*
* @brief Writes the 1st half of a Flash-WORD to NV (filling 2nd half with 0xffff).
*
* @param pg - A valid NV Flash page.
* @param offset - A valid offset into the page.
* @param buf - Pointer to source buffer.
*
* @return none
*/
static void writeWordH( uint8 pg, uint16 offset, uint8 *buf )
{
uint8 tmp[4];
tmp[0] = buf[0];
tmp[1] = buf[1];
tmp[2] = OSAL_NV_ERASED;
tmp[3] = OSAL_NV_ERASED;
writeWord( pg, offset, tmp );
}
/*********************************************************************
* @fn writeBuf
*
* @brief Writes a data buffer to NV.
*
* @param dstPg - A valid NV Flash page.
* @param offset - A valid offset into the page.
* @param len - Byte count of the data to write.
* @param buf - The data to write.
*
* @return TRUE if data buf checksum matches read back checksum, else FALSE.
*/
static void writeBuf( uint8 dstPg, uint16 dstOff, uint16 len, uint8 *buf )
{
uint8 rem = dstOff % OSAL_NV_WORD_SIZE;
uint8 tmp[OSAL_NV_WORD_SIZE];
if ( rem )
{
dstOff = (dstOff / OSAL_NV_WORD_SIZE) * OSAL_NV_WORD_SIZE;
HalFlashRead(dstPg, dstOff, tmp, OSAL_NV_WORD_SIZE);
while ( (rem < OSAL_NV_WORD_SIZE) && len )
{
tmp[rem++] = *buf++;
len--;
}
writeWord( dstPg, dstOff, tmp );
dstOff += OSAL_NV_WORD_SIZE;
}
rem = len % OSAL_NV_WORD_SIZE;
len /= OSAL_NV_WORD_SIZE;
if ( len )
{
writeWordM( dstPg, dstOff, buf, len );
dstOff += OSAL_NV_WORD_SIZE * len;
buf += OSAL_NV_WORD_SIZE * len;
}
if ( rem )
{
uint8 idx = 0;
HalFlashRead(dstPg, dstOff, tmp, OSAL_NV_WORD_SIZE);
while ( rem-- )
{
tmp[idx++] = *buf++;
}
writeWord( dstPg, dstOff, tmp );
}
}
/*********************************************************************
* @fn xferBuf
*
* @brief Xfers an NV buffer from one location to another, enforcing OSAL_NV_WORD_SIZE writes.
*
* @return none
*/
static void xferBuf( uint8 srcPg, uint16 srcOff, uint8 dstPg, uint16 dstOff, uint16 len )
{
uint8 rem = dstOff % OSAL_NV_WORD_SIZE;
uint8 tmp[OSAL_NV_WORD_SIZE];
if ( rem )
{
dstOff -= rem;
HalFlashRead(dstPg, dstOff, tmp, OSAL_NV_WORD_SIZE);
while ( (rem < OSAL_NV_WORD_SIZE) && len )
{
HalFlashRead(srcPg, srcOff, tmp+rem, 1);
srcOff++;
rem++;
len--;
}
writeWord( dstPg, dstOff, tmp );
dstOff += OSAL_NV_WORD_SIZE;
}
rem = len % OSAL_NV_WORD_SIZE;
len /= OSAL_NV_WORD_SIZE;
while ( len-- )
{
HalFlashRead(srcPg, srcOff, tmp, OSAL_NV_WORD_SIZE);
srcOff += OSAL_NV_WORD_SIZE;
writeWord( dstPg, dstOff, tmp );
dstOff += OSAL_NV_WORD_SIZE;
}
if ( rem )
{
uint8 idx = 0;
HalFlashRead(dstPg, dstOff, tmp, OSAL_NV_WORD_SIZE);
while ( rem-- )
{
HalFlashRead(srcPg, srcOff, tmp+idx, 1);
srcOff++;
idx++;
}
writeWord( dstPg, dstOff, tmp );
}
}
/*********************************************************************
* @fn writeItem
*
* @brief Writes an item header/data combo to the specified NV page.
*
* @param pg - Valid NV Flash page.
* @param id - Valid NV item Id.
* @param len - Byte count of the data to write.
* @param buf - The data to write. If NULL, no data/checksum write.
* @param flag - TRUE if the checksum should be written, FALSE otherwise.
*
* @return TRUE if header/data to write matches header/data read back, else FALSE.
*/
static uint8 writeItem( uint8 pg, uint16 id, uint16 len, void *buf, uint8 flag )
{
uint16 offset = pgOff[pg-OSAL_NV_PAGE_BEG];
uint8 rtrn = FALSE;
osalNvHdr_t hdr;
if ( pg == pgRes )
{
/* Mark reserve page as being active, in process of receiving items.
* Invoking function must effect a page compaction.
*/
setPageUse( pg, FALSE );
}
hdr.id = id;
hdr.len = len;
writeWord( pg, offset, (uint8 *)&hdr );
HalFlashRead(pg, offset, (uint8 *)(&hdr), OSAL_NV_HDR_SIZE);
if ( (hdr.id == id) && (hdr.len == len) )
{
if ( flag )
{
uint16 chk = calcChkB( len, buf );
offset += OSAL_NV_HDR_SIZE;
if ( buf != NULL )
{
writeBuf( pg, offset, len, buf );
}
if ( chk == calcChkF( pg, offset, len ) )
{
writeWordH(pg, (offset-OSAL_NV_WORD_SIZE), (uint8 *)&chk);
HalFlashRead(pg, (offset-OSAL_NV_HDR_SIZE), (uint8 *)(&hdr), OSAL_NV_HDR_SIZE);
if ( chk == hdr.chk )
{
rtrn = pg;
}
}
}
else
{
rtrn = pg;
}
}
len = OSAL_NV_ITEM_SIZE( hdr.len );
pgOff[pg-OSAL_NV_PAGE_BEG] += len;
return rtrn;
}
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