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 * Author: Adam Dunkels <adam@sics.se> 00033 * 00034 */ 00035 00036 #include "contiki.h" 00037 #include "dev/flash.h" 00038 #include "dev/watchdog.h" 00039 00040 #define FLASH_TIMEOUT 30 00041 #define FLASH_REQ_TIMEOUT 150 00042 00043 static uint16_t sfrie; 00044 00045 /*---------------------------------------------------------------------------*/ 00046 void 00047 flash_setup(void) 00048 { 00049 /* disable all interrupts to protect CPU 00050 during programming from system crash */ 00051 dint(); 00052 00053 /* Clear interrupt flag1. */ 00054 SFRIFG1 = 0; 00055 /* The IFG1 = 0; statement locks up contikimac - not sure if this 00056 statement needs to be here at all. I've removed it for now, since 00057 it seems to work, but leave this little note here in case someone 00058 stumbles over this code at some point. */ 00059 00060 /* Stop watchdog. */ 00061 watchdog_stop(); 00062 00063 /* disable all NMI-Interrupt sources */ 00064 sfrie = SFRIE1; 00065 SFRIE1 = 0x00; 00066 } 00067 /*---------------------------------------------------------------------------*/ 00068 void 00069 flash_done(void) 00070 { 00071 /* Enable interrupts. */ 00072 SFRIE1 = sfrie; 00073 eint(); 00074 watchdog_start(); 00075 } 00076 /*---------------------------------------------------------------------------*/ 00077 void 00078 flash_clear(unsigned short *ptr) 00079 { 00080 uint8_t r; 00081 FCTL3 = 0xA500; /* Lock = 0 */ 00082 while(FCTL3 & 0x0001) r++; /* Wait for BUSY = 0, not needed 00083 unless run from RAM */ 00084 FCTL1 = 0xA502; /* ERASE = 1 */ 00085 *ptr = 0; /* erase Flash segment */ 00086 FCTL1 = 0xA500; /* ERASE = 0 automatically done?! */ 00087 FCTL3 = 0xA510; /* Lock = 1 */ 00088 } 00089 /*---------------------------------------------------------------------------*/ 00090 void 00091 flash_write(unsigned short *ptr, unsigned short word) 00092 { 00093 uint8_t r; 00094 FCTL3 = 0xA500; /* Lock = 0 */ 00095 while(FCTL3 & 0x0001) r++; /* Wait for BUSY = 0, not needed unless 00096 run from RAM */ 00097 FCTL1 = 0xA540; /* WRT = 1 */ 00098 *ptr = word; /* program Flash word */ 00099 FCTL1 = 0xA500; /* WRT = 0 */ 00100 FCTL3 = 0xA510; /* Lock = 1 */ 00101 } 00102 /*---------------------------------------------------------------------------*/