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Coffee is placed by default at the beginning of the flash memory, right before the firmware. This avoids the memory gaps that there could be before and after Coffee if it were placed after the firmware, because it is unlikely that the end of the firmware is aligned with a flash page boundary, and the CCA is not flash-page-aligned. Thanks to that, Coffee is also always in the same flash area if its size remains unchanged, even if the firmware changes, which makes it possible to keep the Coffee files when reprogramming the firmware after a partial flash erase command. The default configuration of Coffee is set to use sensible values for a typical usage on this SoC, i.e. for sensor data logging. The default size of Coffee is set to 0 in order not to waste flash if Coffee is unused. COFFEE_CONF_CUSTOM_PORT can be defined to a header file to be used with "#include" in order to override the default CC2538 port of Coffee. This makes it possible to use Coffee with an external memory device rather than with the internal flash memory, without having to alter the Contiki files. Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
145 lines
4.8 KiB
C
145 lines
4.8 KiB
C
/*
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* Copyright (c) 2013, ADVANSEE - http://www.advansee.com/
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \addtogroup cc2538-cfs-coffee-arch
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* @{
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*
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* \file
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* Module for the cc2538 Coffee port
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*/
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#include "contiki-conf.h"
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#include "sys/cc.h"
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#include "cfs/cfs-coffee.h"
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#include "dev/cc2538-dev.h"
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#include "dev/rom-util.h"
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#include "dev/flash.h"
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#include "dev/watchdog.h"
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#include "cpu.h"
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#include "cfs-coffee-arch.h"
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#include <stdint.h>
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#ifndef COFFEE_CONF_CUSTOM_PORT
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/*---------------------------------------------------------------------------*/
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#if !COFFEE_SECTOR_SIZE || COFFEE_SECTOR_SIZE % FLASH_PAGE_SIZE
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#error COFFEE_SECTOR_SIZE must be a non-zero multiple of the flash page size
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#endif
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#if !COFFEE_PAGE_SIZE || COFFEE_SECTOR_SIZE % COFFEE_PAGE_SIZE
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#error COFFEE_PAGE_SIZE must be a divisor of COFFEE_SECTOR_SIZE
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#endif
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#if COFFEE_PAGE_SIZE % FLASH_WORD_SIZE
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#error COFFEE_PAGE_SIZE must be a multiple of the flash word size
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#endif
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#if COFFEE_START % FLASH_PAGE_SIZE
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#error COFFEE_START must be aligned with a flash page boundary
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#endif
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#if COFFEE_SIZE % COFFEE_SECTOR_SIZE
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#error COFFEE_SIZE must be a multiple of COFFEE_SECTOR_SIZE
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#endif
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#if COFFEE_SIZE / COFFEE_PAGE_SIZE > INT16_MAX
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#error Too many Coffee pages for coffee_page_t
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#endif
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#if COFFEE_START < CC2538_DEV_FLASH_ADDR || \
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COFFEE_START + COFFEE_SIZE > FLASH_CCA_ADDR
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#error Coffee does not fit in flash
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#endif
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/*---------------------------------------------------------------------------*/
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void
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cfs_coffee_arch_erase(uint16_t sector)
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{
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watchdog_periodic();
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INTERRUPTS_DISABLE();
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rom_util_page_erase(COFFEE_START + sector * COFFEE_SECTOR_SIZE,
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COFFEE_SECTOR_SIZE);
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INTERRUPTS_ENABLE();
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}
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/*---------------------------------------------------------------------------*/
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void
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cfs_coffee_arch_write(const void *buf, unsigned int size, cfs_offset_t offset)
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{
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const uint32_t *src = buf;
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uint32_t flash_addr = COFFEE_START + offset;
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unsigned int align;
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uint32_t word, len;
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uint32_t page_buf[COFFEE_PAGE_SIZE / FLASH_WORD_SIZE];
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unsigned int i;
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if(size && (align = flash_addr & (FLASH_WORD_SIZE - 1))) {
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len = MIN(FLASH_WORD_SIZE - align, size);
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word = ~((*src & ((1 << (len << 3)) - 1)) << (align << 3));
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watchdog_periodic();
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INTERRUPTS_DISABLE();
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rom_util_program_flash(&word, flash_addr & ~(FLASH_WORD_SIZE - 1),
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FLASH_WORD_SIZE);
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INTERRUPTS_ENABLE();
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*(const uint8_t **)&src += len;
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size -= len;
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flash_addr += len;
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}
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while(size >= FLASH_WORD_SIZE) {
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len = MIN(size & ~(FLASH_WORD_SIZE - 1), COFFEE_PAGE_SIZE);
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for(i = 0; i < len / FLASH_WORD_SIZE; i++) {
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page_buf[i] = ~*src++;
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}
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watchdog_periodic();
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INTERRUPTS_DISABLE();
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rom_util_program_flash(page_buf, flash_addr, len);
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INTERRUPTS_ENABLE();
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size -= len;
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flash_addr += len;
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}
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if(size) {
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word = ~(*src & ((1 << (size << 3)) - 1));
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watchdog_periodic();
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INTERRUPTS_DISABLE();
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rom_util_program_flash(&word, flash_addr, FLASH_WORD_SIZE);
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INTERRUPTS_ENABLE();
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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cfs_coffee_arch_read(void *buf, unsigned int size, cfs_offset_t offset)
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{
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const uint8_t *src;
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uint8_t *dst;
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watchdog_periodic();
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for(src = (const void *)(COFFEE_START + offset), dst = buf; size; size--) {
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*dst++ = ~*src++;
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}
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}
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#endif /* COFFEE_CONF_CUSTOM_PORT */
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/** @} */
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