Contiki 2.6
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00001 /** 00002 * \file 00003 * Functions for reading and writing flash ROM. 00004 * \author Adam Dunkels <adam@sics.se> 00005 */ 00006 00007 /* Copyright (c) 2004 Swedish Institute of Computer Science. 00008 * All rights reserved. 00009 * 00010 * Redistribution and use in source and binary forms, with or without modification, 00011 * are permitted provided that the following conditions are met: 00012 * 00013 * 1. Redistributions of source code must retain the above copyright notice, 00014 * this list of conditions and the following disclaimer. 00015 * 2. Redistributions in binary form must reproduce the above copyright notice, 00016 * this list of conditions and the following disclaimer in the documentation 00017 * and/or other materials provided with the distribution. 00018 * 3. The name of the author may not be used to endorse or promote products 00019 * derived from this software without specific prior written permission. 00020 * 00021 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00022 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00023 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00024 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00025 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00026 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00027 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00028 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00029 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00030 * OF SUCH DAMAGE. 00031 * 00032 * $Id: flash.c,v 1.3 2010/11/15 21:52:54 adamdunkels Exp $ 00033 * 00034 * Author: Adam Dunkels <adam@sics.se> 00035 * 00036 */ 00037 00038 #include "contiki.h" 00039 #include "dev/flash.h" 00040 #include "dev/watchdog.h" 00041 00042 #define FLASH_TIMEOUT 30 00043 #define FLASH_REQ_TIMEOUT 150 00044 00045 static unsigned short ie1, ie2; 00046 00047 /*---------------------------------------------------------------------------*/ 00048 void 00049 flash_setup(void) 00050 { 00051 /* disable all interrupts to protect CPU 00052 during programming from system crash */ 00053 _DINT(); 00054 00055 /* Clear interrupt flag1. */ 00056 /* IFG1 = 0; */ 00057 /* The IFG1 = 0; statement locks up contikimac - not sure if this 00058 statement needs to be here at all. I've removed it for now, since 00059 it seems to work, but leave this little note here in case someone 00060 stumbles over this code at some point. */ 00061 00062 /* Stop watchdog. */ 00063 watchdog_stop(); 00064 00065 /* DCO(SMCLK) is 2,4576MHz, /6 = 409600 Hz 00066 select SMCLK for flash timing, divider 5+1 */ 00067 FCTL2 = 0xA5C5; 00068 00069 /* disable all NMI-Interrupt sources */ 00070 ie1 = IE1; 00071 ie2 = IE2; 00072 IE1 = 0x00; 00073 IE2 = 0x00; 00074 } 00075 /*---------------------------------------------------------------------------*/ 00076 void 00077 flash_done(void) 00078 { 00079 /* Enable interrupts. */ 00080 IE1 = ie1; 00081 IE2 = ie2; 00082 _EINT(); 00083 watchdog_start(); 00084 } 00085 /*---------------------------------------------------------------------------*/ 00086 void 00087 flash_clear(unsigned short *ptr) 00088 { 00089 FCTL3 = 0xA500; /* Lock = 0 */ 00090 while(FCTL3 & 0x0001) nop(); /* Wait for BUSY = 0, not needed 00091 unless run from RAM */ 00092 FCTL1 = 0xA502; /* ERASE = 1 */ 00093 *ptr = 0; /* erase Flash segment */ 00094 FCTL1 = 0xA500; /* ERASE = 0 automatically done?! */ 00095 FCTL3 = 0xA510; /* Lock = 1 */ 00096 } 00097 /*---------------------------------------------------------------------------*/ 00098 void 00099 flash_write(unsigned short *ptr, unsigned short word) 00100 { 00101 FCTL3 = 0xA500; /* Lock = 0 */ 00102 while(FCTL3 & 0x0001) nop(); /* Wait for BUSY = 0, not needed unless 00103 run from RAM */ 00104 FCTL1 = 0xA540; /* WRT = 1 */ 00105 *ptr = word; /* program Flash word */ 00106 FCTL1 = 0xA500; /* WRT = 0 */ 00107 FCTL3 = 0xA510; /* Lock = 1 */ 00108 } 00109 /*---------------------------------------------------------------------------*/