/************************************************************************************************** Filename: osal_snv.c (patched) Revised: $Date: 2013-02-15 10:12:26 -0800 (Fri, 15 Feb 2013) $ Revision: $Revision: 33143 $ Description: This module contains the OSAL simple non-volatile memory functions. Copyright 2009-2013 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 “AS 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. **************************************************************************************************/ /********************************************************************* * @fn findItem * * @brief find a valid item from a designated page and offset * * @param pg - NV page * @param offset - offset in the NV page from where to start * search up. * Usually this paramter is set to the empty space * offset. * @param id - NV item ID to search for * * @return offset of the item, 0 when not found */ static uint16 findItem(uint8 pg, uint16 offset, osalSnvId_t id) { halIntState_t is; offset -= OSAL_NV_WORD_SIZE; // Calculate the offset into the containing flash bank as it gets mapped into XDATA. uint8 *ptrBase = (uint8 *)(HAL_FLASH_PAGE_MAP) + ((pg % HAL_FLASH_PAGE_PER_BANK) * HAL_FLASH_PAGE_SIZE); uint8 memctr = MEMCTR; // Save to restore. pg /= HAL_FLASH_PAGE_PER_BANK; while (offset >= OSAL_NV_PAGE_HDR_SIZE) { osalNvItemHdr_t hdr; HAL_ENTER_CRITICAL_SECTION(is); //HalFlashRead(pg, offset, (uint8 *) &hdr, OSAL_NV_WORD_SIZE); MEMCTR = (MEMCTR & 0xF8) | pg; for (uint8 i = 0; i < OSAL_NV_WORD_SIZE; ++i) ((uint8*)&hdr)[i] = ptrBase[offset + i]; MEMCTR = memctr; HAL_EXIT_CRITICAL_SECTION(is); if (hdr.id == id) { // item found // length field could be corrupt. Mask invalid length mark. uint8 len = hdr.len & ~OSAL_NV_INVALID_LEN_MARK; return offset - len; } else if (hdr.len & OSAL_NV_INVALID_LEN_MARK) { offset -= OSAL_NV_WORD_SIZE; } else { // valid length field if (hdr.len + OSAL_NV_WORD_SIZE <= offset) { // valid length offset -= hdr.len + OSAL_NV_WORD_SIZE; } else { // active page is corrupt // This could happen if NV initialization failed upon failure to erase // page and active page is set to uncleanly erased page. HAL_ASSERT_FORCED(); return 0; } } } return 0; }