From 807e2adacb025af77bb53c03209e9c8e0d7a5f95 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Thu, 18 Dec 2008 00:18:50 -0800
Subject: Add ability to read/write arbitrary memory. Write LED blinker
 program.

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 ccdbg-memory.c | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 ccdbg-memory.c

(limited to 'ccdbg-memory.c')

diff --git a/ccdbg-memory.c b/ccdbg-memory.c
new file mode 100644
index 00000000..ffc09679
--- /dev/null
+++ b/ccdbg-memory.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright © 2008 Keith Packard <keithp@keithp.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, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include "ccdbg.h"
+
+/*
+ * Read and write arbitrary memory through the debug port
+ */
+
+#define MOV_dptr_data16		0x90
+
+static uint8_t	memory_init[] = {
+	3,	MOV_dptr_data16,	0,	0,
+#define HIGH_START	2
+#define LOW_START	3
+	0,
+};
+
+#define MOV_a_data	0x74
+#define MOVX_atdptr_a	0xf0
+#define MOVX_a_atdptr	0xe0
+#define INC_dptr	0xa3
+
+static uint8_t write8[] = {
+	2,	MOV_a_data,	0,
+#define DATA_BYTE	2
+	1,	MOVX_atdptr_a,
+	1,	INC_dptr,
+	0
+};
+
+static uint8_t read8[] = {
+	1,	MOVX_a_atdptr,
+	1,	INC_dptr,
+	0,
+};
+
+uint8_t
+ccdbg_write_memory(struct ccdbg *dbg, uint16_t addr, uint8_t *bytes, int nbytes)
+{
+	memory_init[HIGH_START] = addr >> 8;
+	memory_init[LOW_START] = addr;
+	(void) ccdbg_execute(dbg, memory_init);
+	while (nbytes-- > 0) {
+		write8[DATA_BYTE] = *bytes++;
+		ccdbg_execute(dbg, write8);
+	}
+	return 0;
+}
+
+uint8_t
+ccdbg_read_memory(struct ccdbg *dbg, uint16_t addr, uint8_t *bytes, int nbytes)
+{
+	memory_init[HIGH_START] = addr >> 8;
+	memory_init[LOW_START] = addr;
+	(void) ccdbg_execute(dbg, memory_init);
+	while (nbytes-- > 0)
+		*bytes++ = ccdbg_execute(dbg, read8);
+	return 0;
+}
-- 
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