+/*
+ * 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;
+}