mspdebug/drivers/device.c

88 lines
2.0 KiB
C

/* MSPDebug - debugging tool for MSP430 MCUs
* Copyright (C) 2009, 2010 Daniel Beer
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "device.h"
device_t device_default;
static int addbrk(device_t dev, uint16_t addr)
{
int i;
int which = -1;
struct device_breakpoint *bp;
for (i = 0; i < dev->max_breakpoints; i++) {
bp = &dev->breakpoints[i];
if (bp->flags & DEVICE_BP_ENABLED) {
if (bp->addr == addr)
return i;
} else if (which < 0) {
which = i;
}
}
if (which < 0)
return -1;
bp = &dev->breakpoints[which];
bp->flags = DEVICE_BP_ENABLED | DEVICE_BP_DIRTY;
bp->addr = addr;
return which;
}
static void delbrk(device_t dev, uint16_t addr)
{
int i;
for (i = 0; i < dev->max_breakpoints; i++) {
struct device_breakpoint *bp = &dev->breakpoints[i];
if ((bp->flags & DEVICE_BP_ENABLED) &&
bp->addr == addr) {
bp->flags = DEVICE_BP_DIRTY;
bp->addr = 0;
}
}
}
int device_setbrk(device_t dev, int which, int enabled, address_t addr)
{
if (which < 0) {
if (enabled)
return addbrk(dev, addr);
delbrk(dev, addr);
} else {
struct device_breakpoint *bp = &dev->breakpoints[which];
int new_flags = enabled ? DEVICE_BP_ENABLED : 0;
if (!enabled)
addr = 0;
if (bp->addr != addr ||
(bp->flags & DEVICE_BP_ENABLED) != new_flags) {
bp->flags = new_flags | DEVICE_BP_DIRTY;
bp->addr = addr;
}
}
return 0;
}