board_memories.c
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上传日期:2022-07-16
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- /* ----------------------------------------------------------------------------
- * ATMEL Microcontroller Software Support
- * ----------------------------------------------------------------------------
- * Copyright (c) 2008, Atmel Corporation
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * - Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the disclaimer below.
- *
- * Atmel's name may not be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
- * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
- * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
- * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- * ----------------------------------------------------------------------------
- */
- //------------------------------------------------------------------------------
- // Headers
- //------------------------------------------------------------------------------
- #include "board_memories.h"
- #include "board.h"
- //------------------------------------------------------------------------------
- // Internal definitions
- //------------------------------------------------------------------------------
- /*
- Constants: Remap types
- BOARD_FLASH - Flash is mirrored in the remap zone.
- BOARD_RAM - RAM is mirrored in the remap zone.
- */
- #define BOARD_FLASH 0
- #define BOARD_RAM 1
- //------------------------------------------------------------------------------
- // Internal function
- //------------------------------------------------------------------------------
- /*
- Function: BOARD_GetRemap
- Returns the current remap (see <Remap types>).
- */
- static unsigned char BOARD_GetRemap( void )
- {
- unsigned int *remap = (unsigned int *) 0;
- unsigned int *ram = (unsigned int *) AT91C_ISRAM;
- // Try to write in 0 and see if this affects the RAM
- unsigned int temp = *ram;
- *ram = temp + 1;
- if (*remap == *ram) {
- *ram = temp;
- return BOARD_RAM;
- }
- else {
- *ram = temp;
- return BOARD_FLASH;
- }
- }
- //------------------------------------------------------------------------------
- // Exported functions
- //------------------------------------------------------------------------------
- /*
- Function: BOARD_RemapFlash
- Changes the mapping of the chip so that the remap area mirrors the
- internal flash.
- */
- void BOARD_RemapFlash( void )
- {
- if (BOARD_GetRemap() != BOARD_FLASH) {
- AT91C_BASE_MC->MC_RCR = AT91C_MC_RCB;
- }
- }
- /*
- Function: BOARD_RemapRam
- Changes the mapping of the chip so that the remap area mirrors the
- internal RAM.
- */
- void BOARD_RemapRam( void )
- {
- if (BOARD_GetRemap() != BOARD_RAM) {
- AT91C_BASE_MC->MC_RCR = AT91C_MC_RCB;
- }
- }