110 lines
3.6 KiB
C
110 lines
3.6 KiB
C
|
/**
|
||
|
|
* \file
|
||
|
|
* Functions for reading and writing flash ROM.
|
||
|
|
* \author Adam Dunkels <adam@sics.se>
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* Copyright (c) 2004 Swedish Institute of Computer Science.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without modification,
|
||
|
|
* are permitted provided that the following conditions are met:
|
||
|
|
*
|
||
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
||
|
|
* this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
||
|
|
* this list of conditions and the following disclaimer in the documentation
|
||
|
|
* and/or other materials provided with the distribution.
|
||
|
|
* 3. The name of the author may not be used to endorse or promote products
|
||
|
|
* derived from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
||
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
|
||
|
|
* SHALL THE AUTHOR 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.
|
||
|
|
*
|
||
|
|
* $Id: flash.c,v 1.1 2006/06/17 22:41:21 adamdunkels Exp $
|
||
|
|
*
|
||
|
|
* Author: Adam Dunkels <adam@sics.se>
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <msp430x14x.h>
|
||
|
|
#include <io.h>
|
||
|
|
#include <signal.h>
|
||
|
|
|
||
|
|
#include "dev/flash.h"
|
||
|
|
|
||
|
|
#define FLASH_TIMEOUT 30
|
||
|
|
#define FLASH_REQ_TIMEOUT 150
|
||
|
|
|
||
|
|
static unsigned short ie1, ie2;
|
||
|
|
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
void
|
||
|
|
flash_setup(void)
|
||
|
|
{
|
||
|
|
|
||
|
|
/* Disable all interrupts. */
|
||
|
|
|
||
|
|
/* Clear interrupt flag1. */
|
||
|
|
IFG1 = 0;
|
||
|
|
|
||
|
|
/* Stop watchdog. */
|
||
|
|
WDTCTL = 0x5A80;
|
||
|
|
|
||
|
|
/* DCO(SMCLK) is 2,4576MHz, /6 = 409600 Hz
|
||
|
|
select SMCLK for flash timing, divider 5+1 */
|
||
|
|
FCTL2 = 0xA5C5;
|
||
|
|
|
||
|
|
/* disable all interrupts to protect CPU
|
||
|
|
during programming from system crash */
|
||
|
|
_DINT();
|
||
|
|
|
||
|
|
/* disable all NMI-Interrupt sources */
|
||
|
|
ie1 = IE1;
|
||
|
|
ie2 = IE2;
|
||
|
|
IE1 = 0x00;
|
||
|
|
IE2 = 0x00;
|
||
|
|
}
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
void
|
||
|
|
flash_done(void)
|
||
|
|
{
|
||
|
|
/* Enable interrupts. */
|
||
|
|
IE1 = ie1;
|
||
|
|
IE2 = ie2;
|
||
|
|
_EINT();
|
||
|
|
}
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
void
|
||
|
|
flash_clear(unsigned short *ptr)
|
||
|
|
{
|
||
|
|
FCTL3 = 0xA500; /* Lock = 0 */
|
||
|
|
while(FCTL3 & 0x0001) nop(); /* Wait for BUSY = 0, not needed
|
||
|
|
unless run from RAM */
|
||
|
|
FCTL1 = 0xA502; /* ERASE = 1 */
|
||
|
|
*ptr = 0; /* erase Flash segment */
|
||
|
|
FCTL1 = 0xA500; /* ERASE = 0 automatically done?! */
|
||
|
|
FCTL3 = 0xA510; /* Lock = 1 */
|
||
|
|
}
|
||
|
|
/*---------------------------------------------------------------------------*/
|
||
|
|
void
|
||
|
|
flash_write(unsigned short *ptr, unsigned short word)
|
||
|
|
{
|
||
|
|
FCTL3 = 0xA500; /* Lock = 0 */
|
||
|
|
while(FCTL3 & 0x0001) nop(); /* Wait for BUSY = 0, not needed unless
|
||
|
|
run from RAM */
|
||
|
|
FCTL1 = 0xA540; /* WRT = 1 */
|
||
|
|
*ptr = word; /* program Flash word */
|
||
|
|
FCTL1 = 0xA500; /* WRT = 0 */
|
||
|
|
FCTL3 = 0xA510; /* Lock = 1 */
|
||
|
|
}
|
||
|
|
/*---------------------------------------------------------------------------*/
|