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path: root/src/avrdude/safemode.c
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+/*
+ * avrdude - A Downloader/Uploader for AVR device programmers
+ * avrdude is Copyright (C) 2000-2004 Brian S. Dean <bsd@bsdhome.com>
+ *
+ * This file: Copyright (C) 2005-2007 Colin O'Flynn <coflynn@newae.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include <stdio.h>
+
+#include "ac_cfg.h"
+
+#include "avrdude.h"
+#include "libavrdude.h"
+
+/* This value from ac_cfg.h */
+/*
+ * Writes the specified fuse in fusename (can be "lfuse", "hfuse", or
+ * "efuse") and verifies it. Will try up to tries amount of times
+ * before giving up
+ */
+int safemode_writefuse (unsigned char fuse, char * fusename, PROGRAMMER * pgm,
+ AVRPART * p, int tries)
+{
+ AVRMEM * m;
+ unsigned char fuseread;
+ int returnvalue = -1;
+
+ m = avr_locate_mem(p, fusename);
+ if (m == NULL) {
+ return -1;
+ }
+
+ /* Keep trying to write then read back the fuse values */
+ while (tries > 0) {
+ if (avr_write_byte(pgm, p, m, 0, fuse) != 0)
+ {
+ continue;
+ }
+ if (pgm->read_byte(pgm, p, m, 0, &fuseread) != 0)
+ {
+ continue;
+ }
+
+ /* Report information to user if needed */
+ avrdude_message(MSG_NOTICE, "%s: safemode: Wrote %s to %x, read as %x. %d attempts left\n",
+ progname, fusename, fuse, fuseread, tries-1);
+
+ /* If fuse wrote OK, no need to keep going */
+ if (fuse == fuseread) {
+ tries = 0;
+ returnvalue = 0;
+ }
+ tries--;
+ }
+
+ return returnvalue;
+}
+
+/*
+ * Reads the fuses three times, checking that all readings are the
+ * same. This will ensure that the before values aren't in error!
+ */
+int safemode_readfuses (unsigned char * lfuse, unsigned char * hfuse,
+ unsigned char * efuse, unsigned char * fuse,
+ PROGRAMMER * pgm, AVRPART * p)
+{
+
+ unsigned char value;
+ unsigned char fusegood = 0;
+ unsigned char allowfuseread = 1;
+ unsigned char safemode_lfuse;
+ unsigned char safemode_hfuse;
+ unsigned char safemode_efuse;
+ unsigned char safemode_fuse;
+ AVRMEM * m;
+
+ safemode_lfuse = *lfuse;
+ safemode_hfuse = *hfuse;
+ safemode_efuse = *efuse;
+ safemode_fuse = *fuse;
+
+
+ /* Read fuse three times */
+ fusegood = 2; /* If AVR device doesn't support this fuse, don't want
+ to generate a verify error */
+ m = avr_locate_mem(p, "fuse");
+ if (m != NULL) {
+ fusegood = 0; /* By default fuse is a failure */
+ if(pgm->read_byte(pgm, p, m, 0, &safemode_fuse) != 0)
+ {
+ allowfuseread = 0;
+ }
+ avrdude_message(MSG_DEBUG, "%s: safemode read 1, fuse value: %x\n",progname, safemode_fuse);
+ if(pgm->read_byte(pgm, p, m, 0, &value) != 0)
+ {
+ allowfuseread = 0;
+ }
+ avrdude_message(MSG_DEBUG, "%s: safemode read 2, fuse value: %x\n",progname, value);
+ if (value == safemode_fuse) {
+ if (pgm->read_byte(pgm, p, m, 0, &value) != 0)
+ {
+ allowfuseread = 0;
+ }
+ avrdude_message(MSG_DEBUG, "%s: safemode read 3, fuse value: %x\n",progname, value);
+ if (value == safemode_fuse)
+ {
+ fusegood = 1; /* Fuse read OK three times */
+ }
+ }
+ }
+
+ //Programmer does not allow fuse reading.... no point trying anymore
+ if (allowfuseread == 0)
+ {
+ return -5;
+ }
+
+ if (fusegood == 0) {
+ avrdude_message(MSG_INFO, "%s: safemode: Verify error - unable to read fuse properly. "
+ "Programmer may not be reliable.\n", progname);
+ return -1;
+ }
+ else if (fusegood == 1) {
+ avrdude_message(MSG_NOTICE, "%s: safemode: fuse reads as %X\n", progname, safemode_fuse);
+ }
+
+
+ /* Read lfuse three times */
+ fusegood = 2; /* If AVR device doesn't support this fuse, don't want
+ to generate a verify error */
+ m = avr_locate_mem(p, "lfuse");
+ if (m != NULL) {
+ fusegood = 0; /* By default fuse is a failure */
+ if (pgm->read_byte(pgm, p, m, 0, &safemode_lfuse) != 0)
+ {
+ allowfuseread = 0;
+ }
+ avrdude_message(MSG_DEBUG, "%s: safemode read 1, lfuse value: %x\n",progname, safemode_lfuse);
+ if (pgm->read_byte(pgm, p, m, 0, &value) != 0)
+ {
+ allowfuseread = 0;
+ }
+ avrdude_message(MSG_DEBUG, "%s: safemode read 2, lfuse value: %x\n",progname, value);
+ if (value == safemode_lfuse) {
+ if (pgm->read_byte(pgm, p, m, 0, &value) != 0)
+ {
+ allowfuseread = 0;
+ }
+ avrdude_message(MSG_DEBUG, "%s: safemode read 3, lfuse value: %x\n",progname, value);
+ if (value == safemode_lfuse){
+ fusegood = 1; /* Fuse read OK three times */
+ }
+ }
+ }
+
+ //Programmer does not allow fuse reading.... no point trying anymore
+ if (allowfuseread == 0)
+ {
+ return -5;
+ }
+
+
+ if (fusegood == 0) {
+ avrdude_message(MSG_INFO, "%s: safemode: Verify error - unable to read lfuse properly. "
+ "Programmer may not be reliable.\n", progname);
+ return -1;
+ }
+ else if (fusegood == 1) {
+ avrdude_message(MSG_DEBUG, "%s: safemode: lfuse reads as %X\n", progname, safemode_lfuse);
+ }
+
+ /* Read hfuse three times */
+ fusegood = 2; /* If AVR device doesn't support this fuse, don't want
+ to generate a verify error */
+ m = avr_locate_mem(p, "hfuse");
+ if (m != NULL) {
+ fusegood = 0; /* By default fuse is a failure */
+ if (pgm->read_byte(pgm, p, m, 0, &safemode_hfuse) != 0)
+ {
+ allowfuseread = 0;
+ }
+ avrdude_message(MSG_DEBUG, "%s: safemode read 1, hfuse value: %x\n",progname, safemode_hfuse);
+ if (pgm->read_byte(pgm, p, m, 0, &value) != 0)
+ {
+ allowfuseread = 0;
+ }
+ avrdude_message(MSG_DEBUG, "%s: safemode read 2, hfuse value: %x\n",progname, value);
+ if (value == safemode_hfuse) {
+ if (pgm->read_byte(pgm, p, m, 0, &value) != 0)
+ {
+ allowfuseread = 0;
+ }
+ avrdude_message(MSG_DEBUG, "%s: safemode read 3, hfuse value: %x\n",progname, value);
+ if (value == safemode_hfuse){
+ fusegood = 1; /* Fuse read OK three times */
+ }
+ }
+ }
+
+ //Programmer does not allow fuse reading.... no point trying anymore
+ if (allowfuseread == 0)
+ {
+ return -5;
+ }
+
+ if (fusegood == 0) {
+ avrdude_message(MSG_INFO, "%s: safemode: Verify error - unable to read hfuse properly. "
+ "Programmer may not be reliable.\n", progname);
+ return -2;
+ }
+ else if (fusegood == 1){
+ avrdude_message(MSG_NOTICE, "%s: safemode: hfuse reads as %X\n", progname, safemode_hfuse);
+ }
+
+ /* Read efuse three times */
+ fusegood = 2; /* If AVR device doesn't support this fuse, don't want
+ to generate a verify error */
+ m = avr_locate_mem(p, "efuse");
+ if (m != NULL) {
+ fusegood = 0; /* By default fuse is a failure */
+ if (pgm->read_byte(pgm, p, m, 0, &safemode_efuse) != 0)
+ {
+ allowfuseread = 0;
+ }
+ avrdude_message(MSG_DEBUG, "%s: safemode read 1, efuse value: %x\n",progname, safemode_efuse);
+ if (pgm->read_byte(pgm, p, m, 0, &value) != 0)
+ {
+ allowfuseread = 0;
+ }
+ avrdude_message(MSG_DEBUG, "%s: safemode read 2, efuse value: %x\n",progname, value);
+ if (value == safemode_efuse) {
+ if (pgm->read_byte(pgm, p, m, 0, &value) != 0)
+ {
+ allowfuseread = 0;
+ }
+ avrdude_message(MSG_DEBUG, "%s: safemode read 3, efuse value: %x\n",progname, value);
+ if (value == safemode_efuse){
+ fusegood = 1; /* Fuse read OK three times */
+ }
+ }
+ }
+
+ //Programmer does not allow fuse reading.... no point trying anymore
+ if (allowfuseread == 0)
+ {
+ return -5;
+ }
+
+ if (fusegood == 0) {
+ avrdude_message(MSG_INFO, "%s: safemode: Verify error - unable to read efuse properly. "
+ "Programmer may not be reliable.\n", progname);
+ return -3;
+ }
+ else if (fusegood == 1) {
+ avrdude_message(MSG_NOTICE, "%s: safemode: efuse reads as %X\n", progname, safemode_efuse);
+ }
+
+ *lfuse = safemode_lfuse;
+ *hfuse = safemode_hfuse;
+ *efuse = safemode_efuse;
+ *fuse = safemode_fuse;
+
+ return 0;
+}
+
+
+/*
+ * This routine will store the current values pointed to by lfuse,
+ * hfuse, and efuse into an internal buffer in this routine 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 pointed to be
+ * lfuse, hfuse, and efuse. This allows you to change the fuse bits if
+ * needed from another routine (ie: have it so if user requests fuse
+ * bits are changed, the requested value is now verified
+ */
+int safemode_memfuses (int save, unsigned char * lfuse, unsigned char * hfuse,
+ unsigned char * efuse, unsigned char * fuse)
+{
+ static unsigned char safemode_lfuse = 0xff;
+ static unsigned char safemode_hfuse = 0xff;
+ static unsigned char safemode_efuse = 0xff;
+ static unsigned char safemode_fuse = 0xff;
+
+ switch (save) {
+
+ /* Save the fuses as safemode setting */
+ case 1:
+ safemode_lfuse = *lfuse;
+ safemode_hfuse = *hfuse;
+ safemode_efuse = *efuse;
+ safemode_fuse = *fuse;
+
+ break;
+ /* Read back the fuses */
+ default:
+ *lfuse = safemode_lfuse;
+ *hfuse = safemode_hfuse;
+ *efuse = safemode_efuse;
+ *fuse = safemode_fuse;
+ break;
+ }
+
+ return 0;
+}
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