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authorNicolas Schodet2013-04-03 23:17:59 +0200
committerNicolas Schodet2013-04-03 23:17:59 +0200
commit7b230c04b3d4be2ac4d78414efe201dc11415c7c (patch)
tree6f9120ac9bdcafb587d036ef5991c560e0fc2a90 /src/platforms/dev2/swdptap.c
parent46898a71cea16b5e8159816f6c0a57e989900a3b (diff)
Add dev2 support.
This is used for APBTeam dev2 board. Black Magic runs on computer system and communicates with dev2 over usb, giving simple orders.
Diffstat (limited to 'src/platforms/dev2/swdptap.c')
-rw-r--r--src/platforms/dev2/swdptap.c171
1 files changed, 171 insertions, 0 deletions
diff --git a/src/platforms/dev2/swdptap.c b/src/platforms/dev2/swdptap.c
new file mode 100644
index 0000000..50f9bbb
--- /dev/null
+++ b/src/platforms/dev2/swdptap.c
@@ -0,0 +1,171 @@
+/*
+ * This file is part of the Black Magic Debug project.
+ *
+ * Copyright (C) 2011 Black Sphere Technologies Ltd.
+ * Written by Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * 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 3 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/>.
+ */
+
+/* This file implements the low-level SW-DP interface. */
+
+#include <stdio.h>
+
+#include "general.h"
+
+#include "swdptap.h"
+
+#include "gdb_packet.h"
+
+static void swdptap_turnaround(uint8_t dir)
+{
+ static uint8_t olddir = 0;
+
+ DEBUG("%s", dir ? "\n-> ":"\n<- ");
+
+ /* Don't turnaround if direction not changing */
+ if(dir == olddir) return;
+ olddir = dir;
+
+ uint8_t cmd[6];
+ int i = 0;
+
+ if(dir) {
+ cmd[i++] = DEV2_OP_DIR_IN;
+ cmd[i++] = SWDIO_PIN;
+ }
+ cmd[i++] = DEV2_OP_OUT_SET;
+ cmd[i++] = SWCLK_PIN;
+ cmd[i++] = DEV2_OP_OUT_RESET;
+ cmd[i++] = SWCLK_PIN;
+ if(!dir)
+ {
+ cmd[i++] = DEV2_OP_DIR_OUT;
+ cmd[i++] = SWDIO_PIN;
+ }
+ platform_buffer_write(cmd, i);
+}
+
+static uint8_t swdptap_bit_in(void)
+{
+ uint8_t cmd[] = {
+ DEV2_OP_IN,
+ DEV2_OP_OUT_SET, SWCLK_PIN,
+ DEV2_OP_OUT_RESET, SWCLK_PIN,
+ };
+ platform_buffer_write (cmd, sizeof (cmd));
+ uint8_t rep[1];
+ platform_buffer_read (rep, sizeof (rep));
+ int ret = rep[0] & SWDIO_PIN;
+
+ DEBUG("%d", ret?1:0);
+
+ return ret != 0;
+}
+
+static void swdptap_bit_out(uint8_t val)
+{
+ DEBUG("%d", val);
+
+ uint8_t cmd[] = {
+ DEV2_OP_OUT_CHANGE, SWDIO_PIN, (val ? SWDIO_PIN : 0),
+ DEV2_OP_OUT_SET, SWCLK_PIN,
+ DEV2_OP_OUT_RESET, SWCLK_PIN,
+ };
+ platform_buffer_write (cmd, sizeof (cmd));
+}
+
+int swdptap_init(void)
+{
+ /* This must be investigated in more detail.
+ * As described in STM32 Reference Manual... */
+ swdptap_reset();
+ swdptap_seq_out(0xE79E, 16); /* 0b0111100111100111 */
+ swdptap_reset();
+ swdptap_seq_out(0, 16);
+
+ return 0;
+}
+
+
+void swdptap_reset(void)
+{
+ swdptap_turnaround(0);
+ /* 50 clocks with TMS high */
+ for(int i = 0; i < 50; i++) swdptap_bit_out(1);
+}
+
+
+uint32_t swdptap_seq_in(int ticks)
+{
+ uint32_t index = 1;
+ uint32_t ret = 0;
+
+ swdptap_turnaround(1);
+
+ while(ticks--) {
+ if(swdptap_bit_in()) ret |= index;
+ index <<= 1;
+ }
+
+ return ret;
+}
+
+
+uint8_t swdptap_seq_in_parity(uint32_t *ret, int ticks)
+{
+ uint32_t index = 1;
+ uint8_t parity = 0;
+ *ret = 0;
+
+ swdptap_turnaround(1);
+
+ while(ticks--) {
+ if(swdptap_bit_in()) {
+ *ret |= index;
+ parity ^= 1;
+ }
+ index <<= 1;
+ }
+ if(swdptap_bit_in()) parity ^= 1;
+
+ return parity;
+}
+
+
+void swdptap_seq_out(uint32_t MS, int ticks)
+{
+ swdptap_turnaround(0);
+
+ while(ticks--) {
+ swdptap_bit_out(MS & 1);
+ MS >>= 1;
+ }
+}
+
+
+void swdptap_seq_out_parity(uint32_t MS, int ticks)
+{
+ uint8_t parity = 0;
+
+ swdptap_turnaround(0);
+
+ while(ticks--) {
+ swdptap_bit_out(MS & 1);
+ parity ^= MS;
+ MS >>= 1;
+ }
+ swdptap_bit_out(parity & 1);
+}
+