Basic simulation implementation (memory IO only).

Makefile

@@ -26,7 +26,7 @@ clean:
 .SUFFIXES: .c .o
 
 mspdebug: main.o fet.o rf2500.o dis.o uif.o ihex.o elf32.o stab.o util.o \
-	  bsl.o
+	  bsl.o sim.o
 	$(CC) $(CFLAGS) -o $@ $^ -lusb
 
 .c.o:

device.h

@@ -54,4 +54,7 @@ const struct device *fet_open(const struct fet_transport *transport,
 /* MSP430 FET Bootloader implementation. */
 const struct device *fet_open_bl(const struct fet_transport *transport);
 
+/* Dummy/simulation implementation. */
+const struct device *sim_open(void);
+
 #endif

main.c

@@ -616,7 +616,7 @@ static void reader_loop(void)
 static void usage(const char *progname)
 {
 	fprintf(stderr,
-"Usage: %s [-u device] [-j] [-B] [-v voltage] [command ...]\n"
+"Usage: %s [-u device] [-j] [-B] [-s] [-v voltage] [command ...]\n"
 "\n"
 "    -u device\n"
 "        Open the given tty device (MSP430 UIF compatible devices).\n"
@@ -626,6 +626,8 @@ static void usage(const char *progname)
 "        Set the supply voltage, in millivolts.\n"
 "    -B\n"
 "        Debug the FET itself through the bootloader.\n"
+"    -s\n"
+"        Start in simulation mode (only memory IO is allowed).\n"
 "\n"
 "By default, the first RF2500 device on the USB bus is opened.\n"
 "\n"
@@ -642,6 +644,7 @@ int main(int argc, char **argv)
 	int flags = 0;
 	int want_jtag = 0;
 	int want_bootloader = 0;
+	int want_sim = 0;
 	int vcc_mv = 3000;
 
 	puts(
@@ -650,7 +653,8 @@ int main(int argc, char **argv)
 "This is free software; see the source for copying conditions.  There is NO\n"
 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n");
 
-	while ((opt = getopt(argc, argv, "u:jv:B")) >= 0)
+	/* Parse arguments */
+	while ((opt = getopt(argc, argv, "u:jv:Bs")) >= 0)
 		switch (opt) {
 		case 'u':
 			uif_device = optarg;
@@ -668,28 +672,38 @@ int main(int argc, char **argv)
 			want_bootloader = 1;
 			break;
 
+		case 's':
+			want_sim = 1;
+			break;
+
 		default:
 			usage(argv[0]);
 			return -1;
 		}
 
-	/* Open the appropriate transport */
-	if (uif_device)
-		trans = uif_open(uif_device);
-	else {
-		trans = rf2500_open();
-		flags |= FET_PROTO_RF2500;
-	}
-	if (!trans)
-		return -1;
+	/* Open a device */
+	if (want_sim) {
+		msp430_dev = sim_open();
+	} else {
+		/* Open the appropriate transport */
+		if (uif_device)
+			trans = uif_open(uif_device);
+		else {
+			trans = rf2500_open();
+			flags |= FET_PROTO_RF2500;
+		}
+		if (!trans)
+			return -1;
+
+		/* Then initialize the device */
+		if (!want_jtag)
+			flags |= FET_PROTO_SPYBIWIRE;
+		if (want_bootloader)
+			msp430_dev = fet_open_bl(trans);
+		else
+			msp430_dev = fet_open(trans, flags, vcc_mv);
+	}
 
-	/* Then initialize the device */
-	if (!want_jtag)
-		flags |= FET_PROTO_SPYBIWIRE;
-	if (want_bootloader)
-		msp430_dev = fet_open_bl(trans);
-	else
-		msp430_dev = fet_open(trans, flags, vcc_mv);
 	if (!msp430_dev)
 		return -1;
 

sim.c

@@ -0,0 +1,115 @@
+/* MSPDebug - debugging tool for the eZ430
+ * 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 <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include "device.h"
+
+#define MEM_SIZE	65536
+
+static u_int8_t *memory;
+
+static void sim_close(void)
+{
+	if (memory) {
+		free(memory);
+		memory = NULL;
+	}
+}
+
+static int sim_control(device_ctl_t action)
+{
+	switch (action) {
+	case DEVICE_CTL_ERASE:
+		memset(memory, 0xff, MEM_SIZE);
+		return 0;
+
+	case DEVICE_CTL_HALT:
+		return 0;
+
+	default:
+		fprintf(stderr, "sim: CPU control is not implemented\n");
+		break;
+	}
+
+	return -1;
+}
+
+static int sim_wait(void)
+{
+	return 0;
+}
+
+static int sim_breakpoint(u_int16_t addr)
+{
+	return 0;
+}
+
+static int sim_getregs(u_int16_t *regs)
+{
+	fprintf(stderr, "sim: register fetch is not implemented\n");
+	return -1;
+}
+
+static int sim_setregs(const u_int16_t *regs)
+{
+	fprintf(stderr, "sim: register store is not implemented\n");
+	return -1;
+}
+
+static int sim_readmem(u_int16_t addr, u_int8_t *mem, int len)
+{
+	if (addr + len > MEM_SIZE)
+		len = MEM_SIZE - addr;
+
+	memcpy(mem, memory + addr, len);
+	return 0;
+}
+
+static int sim_writemem(u_int16_t addr, const u_int8_t *mem, int len)
+{
+	if (addr + len > MEM_SIZE)
+		len = MEM_SIZE - addr;
+
+	memcpy(memory + addr, mem, len);
+	return 0;
+}
+
+static const struct device sim_device = {
+	.close		= sim_close,
+	.control	= sim_control,
+	.wait		= sim_wait,
+	.breakpoint	= sim_breakpoint,
+	.getregs	= sim_getregs,
+	.setregs	= sim_setregs,
+	.readmem	= sim_readmem,
+	.writemem	= sim_writemem
+};
+
+const struct device *sim_open(void)
+{
+	memory = malloc(MEM_SIZE);
+	if (!memory) {
+		perror("sim: can't allocate memory");
+		return NULL;
+	}
+
+	printf("Simulation started, 0x%x bytes of RAM\n", MEM_SIZE);
+	return &sim_device;
+}