New file. Safe Mode support.
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@442 81a1dc3b-b13d-400b-aceb-764788c761c2
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/*
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* avrdude - A Downloader/Uploader for AVR device programmers
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* avrdude is Copyright (C) 2000-2004 Brian S. Dean <bsd@bsdhome.com>
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*
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* This file: Copyright (C) 2005 Colin O'Flynn <coflynn@newae.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include "ac_cfg.h"
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#include "avr.h"
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#include "pgm.h"
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#include "safemode.h"
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/* This value from ac_cfg.h */
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char * progname = PACKAGE_NAME;
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/* Writes the specified fuse in fusename (can be "lfuse", "hfuse", or "efuse") and verifies it. Will try up to tries
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amount of times before giving up */
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int safemode_writefuse (unsigned char fuse, char * fusename, PROGRAMMER * pgm, AVRPART * p, int tries, int verbose)
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{
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AVRMEM * m;
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unsigned char fuseread;
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int returnvalue = -1;
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m = avr_locate_mem(p, fusename);
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if (m == NULL) {
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return -1;
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}
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/* Keep trying to write then read back the fuse values */
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while (tries > 0) {
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avr_write_byte(pgm, p, m, 0, fuse);
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avr_read_byte(pgm, p, m, 0, &fuseread);
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/* Report information to user if needed */
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if (verbose > 0) {
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fprintf(stderr, "%s: safemode: Wrote %s to %x, read as %x. %d attempts left\n",
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progname, fusename, fuse, fuseread, tries-1);
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}
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/* If fuse wrote OK, no need to keep going */
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if (fuse == fuseread) {
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tries = 0;
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returnvalue = 0;
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}
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tries--;
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}
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return returnvalue;
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}
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/* Reads the fuses three times, checking that all readings are the same. This will ensure that the before values aren't in error! */
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int safemode_readfuses (char * lfuse, char * hfuse, char * efuse, PROGRAMMER * pgm, AVRPART * p, int verbose)
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{
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unsigned char value;
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unsigned char fusegood = 0;
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unsigned char safemode_lfuse;
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unsigned char safemode_hfuse;
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unsigned char safemode_efuse;
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AVRMEM * m;
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safemode_lfuse = *lfuse;
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safemode_hfuse = *hfuse;
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safemode_efuse = *efuse;
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/* Read lfuse three times */
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fusegood = 2; /* If AVR device doesn't support this fuse, don't want
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to generate a verify error */
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m = avr_locate_mem(p, "lfuse");
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if (m != NULL) {
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fusegood = 0; /* By default fuse is a failure */
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avr_read_byte(pgm, p, m, 0, &safemode_lfuse);
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avr_read_byte(pgm, p, m, 0, &value);
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if (value == safemode_lfuse) {
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avr_read_byte(pgm, p, m, 0, &value);
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if (value == safemode_lfuse){
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fusegood = 1; /* Fuse read OK three times */
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}
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}
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}
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if (fusegood == 0) {
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fprintf(stderr,
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"%s: safemode: Verify error - unable to read lfuse properly. "
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"Programmer may not be reliable.\n", progname);
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return -1;
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}
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else if ((fusegood == 1) && (verbose > 0)) {
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printf("%s: safemode: lfuse reads as %X\n", progname, safemode_lfuse);
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}
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/* Read hfuse three times */
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fusegood = 2; /* If AVR device doesn't support this fuse, don't want
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to generate a verify error */
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m = avr_locate_mem(p, "hfuse");
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if (m != NULL) {
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fusegood = 0; /* By default fuse is a failure */
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avr_read_byte(pgm, p, m, 0, &safemode_hfuse);
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avr_read_byte(pgm, p, m, 0, &value);
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if (value == safemode_hfuse) {
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avr_read_byte(pgm, p, m, 0, &value);
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if (value == safemode_hfuse){
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fusegood = 1; /* Fuse read OK three times */
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}
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}
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}
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if (fusegood == 0) {
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fprintf(stderr,
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"%s: safemode: Verify error - unable to read hfuse properly. "
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"Programmer may not be reliable.\n", progname);
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return -2;
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}
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else if ((fusegood == 1) && (verbose > 0)){
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printf("%s: safemode: hfuse reads as %X\n", progname, safemode_hfuse);
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}
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/* Read efuse three times */
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fusegood = 2; /* If AVR device doesn't support this fuse, don't want
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to generate a verify error */
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m = avr_locate_mem(p, "efuse");
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if (m != NULL) {
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fusegood = 0; /* By default fuse is a failure */
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avr_read_byte(pgm, p, m, 0, &safemode_efuse);
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avr_read_byte(pgm, p, m, 0, &value);
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if (value == safemode_efuse) {
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avr_read_byte(pgm, p, m, 0, &value);
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if (value == safemode_efuse){
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fusegood = 1; /* Fuse read OK three times */
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}
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}
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}
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if (fusegood == 0) {
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fprintf(stderr,
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"%s: safemode: Verify error - unable to read efuse properly. "
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"Programmer may not be reliable.\n", progname);
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return -3;
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}
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else if ((fusegood == 1) && (verbose > 0)) {
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printf("%s: safemode: efuse reads as %X\n", progname, safemode_efuse);
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}
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*lfuse = safemode_lfuse;
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*hfuse = safemode_hfuse;
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*efuse = safemode_efuse;
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return 0;
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}
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/* This routine will store the current values pointed to by lfuse, hfuse, and efuse into an internal buffer in this routine
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when save is set to 1. When save is 0 (or not 1 really) it will copy the values from the internal buffer into the locations
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pointed to be lfuse, hfuse, and efuse. This allows you to change the fuse bits if needed from another routine (ie: have it so
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if user requests fuse bits are changed, the requested value is now verified */
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int safemode_memfuses (int save, unsigned char * lfuse, unsigned char * hfuse, unsigned char * efuse)
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{
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static unsigned char safemode_lfuse = 0xff;
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static unsigned char safemode_hfuse = 0xff;
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static unsigned char safemode_efuse = 0xff;
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switch (save) {
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/* Save the fuses as safemode setting */
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case 1:
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safemode_lfuse = *lfuse;
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safemode_hfuse = *hfuse;
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safemode_efuse = *efuse;
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break;
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/* Read back the fuses */
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default:
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*lfuse = safemode_lfuse;
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*hfuse = safemode_hfuse;
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*efuse = safemode_efuse;
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break;
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}
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return 0;
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}
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@ -0,0 +1,39 @@
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/*
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* avrdude - A Downloader/Uploader for AVR device programmers
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* avrdude is Copyright (C) 2000-2004 Brian S. Dean <bsd@bsdhome.com>
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*
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* This file: Copyright (C) 2005 Colin O'Flynn <coflynn@newae.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __safemode_h__
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#define __safemode_h__
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/* Writes the specified fuse in fusename (can be "lfuse", "hfuse", or "efuse") and verifies it. Will try up to tries
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amount of times before giving up */
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int safemode_writefuse (unsigned char fuse, char * fusename, PROGRAMMER * pgm, AVRPART * p, int tries, int verbose);
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/* Reads the fuses three times, checking that all readings are the same. This will ensure that the before values aren't in error! */
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int safemode_readfuses (char * lfuse, char * hfuse, char * efuse, PROGRAMMER * pgm, AVRPART * p, int verbose);
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/* This routine will store the current values pointed to by lfuse, hfuse, and efuse into an internal buffer in this routine
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when save is set to 1. When save is 0 (or not 1 really) it will copy the values from the internal buffer into the locations
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pointed to be lfuse, hfuse, and efuse. This allows you to change the fuse bits if needed from another routine (ie: have it so
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if user requests fuse bits are changed, the requested value is now verified */
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int safemode_memfuses (int save, unsigned char * lfuse, unsigned char * hfuse, unsigned char * efuse);
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#endif //__safemode_h
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