cpu/msp430/flash.c

   1 /**
   2  * \file
   3  * Functions for reading and writing flash ROM.
   4  * \author Adam Dunkels <adam@sics.se>
   5  */
   6
   7 /* Copyright (c) 2004 Swedish Institute of Computer Science.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without modification,
  11  * are permitted provided that the following conditions are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright notice,
  14  *    this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright notice,
  16  *    this list of conditions and the following disclaimer in the documentation
  17  *    and/or other materials provided with the distribution.
  18  * 3. The name of the author may not be used to endorse or promote products
  19  *    derived from this software without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  22  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  23  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
  24  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
  26  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  29  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
  30  * OF SUCH DAMAGE.
  31  *
  32  * $Id: flash.c,v 1.2 2007/11/17 10:28:04 adamdunkels Exp $
  33  *
  34  * Author: Adam Dunkels <adam@sics.se>
  35  *
  36  */
  37
  38 #include <msp430x14x.h>
  39 #include <io.h>
  40 #include <signal.h>
  41
  42 #include "dev/flash.h"
  43 #include "dev/watchdog.h"
  44
  45 #define FLASH_TIMEOUT 30
  46 #define FLASH_REQ_TIMEOUT 150
  47
  48 static unsigned short ie1, ie2;
  49
  50 /*---------------------------------------------------------------------------*/
  51 void
  52 flash_setup(void)
  53 {
  54
  55   /* Disable all interrupts. */
  56
  57   /* Clear interrupt flag1. */
  58   IFG1 = 0;
  59
  60   /* Stop watchdog. */
  61   watchdog_stop();
  62
  63   /* DCO(SMCLK) is 2,4576MHz, /6 = 409600 Hz
  64      select SMCLK for flash timing, divider 5+1 */
  65   FCTL2 = 0xA5C5;
  66
  67   /* disable all interrupts to protect CPU
  68      during programming from system crash */
  69   _DINT();
  70
  71   /* disable all NMI-Interrupt sources */
  72   ie1 = IE1;
  73   ie2 = IE2;
  74   IE1 = 0x00;
  75   IE2 = 0x00;
  76 }
  77 /*---------------------------------------------------------------------------*/
  78 void
  79 flash_done(void)
  80 {
  81   /* Enable interrupts. */
  82   IE1 = ie1;
  83   IE2 = ie2;
  84   _EINT();
  85   watchdog_start();
  86 }
  87 /*---------------------------------------------------------------------------*/
  88 void
  89 flash_clear(unsigned short *ptr)
  90 {
  91   FCTL3 = 0xA500;               /* Lock = 0 */
  92   while(FCTL3 & 0x0001) nop();  /* Wait for BUSY = 0, not needed
  93                                    unless run from RAM */
  94   FCTL1 = 0xA502;               /* ERASE = 1 */
  95   *ptr  = 0;                    /* erase Flash segment */
  96   FCTL1 = 0xA500;               /* ERASE = 0 automatically done?! */
  97   FCTL3 = 0xA510;               /* Lock = 1 */
  98 }
  99 /*---------------------------------------------------------------------------*/
 100 void
 101 flash_write(unsigned short *ptr, unsigned short word)
 102 {
 103   FCTL3 = 0xA500;              /* Lock = 0 */
 104   while(FCTL3 & 0x0001) nop(); /* Wait for BUSY = 0, not needed unless
 105                                   run from RAM */
 106   FCTL1 = 0xA540;              /* WRT = 1 */
 107   *ptr  = word;                /* program Flash word */
 108   FCTL1 = 0xA500;              /* WRT = 0 */
 109   FCTL3 = 0xA510;              /* Lock = 1 */
 110 }
 111 /*---------------------------------------------------------------------------*/