110 lines
3.8 KiB
C
110 lines
3.8 KiB
C
/**
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* \file
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* Functions for reading and writing flash ROM.
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* \author Adam Dunkels <adam@sics.se>
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*/
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/* Copyright (c) 2004 Swedish Institute of Computer Science.
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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 modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* $Id: flash.c,v 1.3 2010/11/15 21:52:54 adamdunkels Exp $
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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#include "contiki.h"
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#include "dev/flash.h"
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#include "dev/watchdog.h"
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#define FLASH_TIMEOUT 30
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#define FLASH_REQ_TIMEOUT 150
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static unsigned short ie1, ie2;
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/*---------------------------------------------------------------------------*/
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void
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flash_setup(void)
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{
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/* disable all interrupts to protect CPU
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during programming from system crash */
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_DINT();
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/* Clear interrupt flag1. */
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/* IFG1 = 0; */
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/* The IFG1 = 0; statement locks up contikimac - not sure if this
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statement needs to be here at all. I've removed it for now, since
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it seems to work, but leave this little note here in case someone
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stumbles over this code at some point. */
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/* Stop watchdog. */
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watchdog_stop();
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/* DCO(SMCLK) is 2,4576MHz, /6 = 409600 Hz
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select SMCLK for flash timing, divider 5+1 */
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FCTL2 = 0xA5C5;
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/* disable all NMI-Interrupt sources */
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ie1 = IE1;
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ie2 = IE2;
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IE1 = 0x00;
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IE2 = 0x00;
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}
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/*---------------------------------------------------------------------------*/
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void
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flash_done(void)
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{
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/* Enable interrupts. */
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IE1 = ie1;
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IE2 = ie2;
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_EINT();
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watchdog_start();
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}
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/*---------------------------------------------------------------------------*/
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void
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flash_clear(unsigned short *ptr)
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{
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FCTL3 = 0xA500; /* Lock = 0 */
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while(FCTL3 & 0x0001) nop(); /* Wait for BUSY = 0, not needed
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unless run from RAM */
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FCTL1 = 0xA502; /* ERASE = 1 */
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*ptr = 0; /* erase Flash segment */
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FCTL1 = 0xA500; /* ERASE = 0 automatically done?! */
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FCTL3 = 0xA510; /* Lock = 1 */
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}
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/*---------------------------------------------------------------------------*/
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void
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flash_write(unsigned short *ptr, unsigned short word)
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{
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FCTL3 = 0xA500; /* Lock = 0 */
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while(FCTL3 & 0x0001) nop(); /* Wait for BUSY = 0, not needed unless
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run from RAM */
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FCTL1 = 0xA540; /* WRT = 1 */
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*ptr = word; /* program Flash word */
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FCTL1 = 0xA500; /* WRT = 0 */
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FCTL3 = 0xA510; /* Lock = 1 */
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}
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/*---------------------------------------------------------------------------*/
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