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Diffstat (limited to 'src/platforms/dev2/jtagtap.c')
-rw-r--r--src/platforms/dev2/jtagtap.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/src/platforms/dev2/jtagtap.c b/src/platforms/dev2/jtagtap.c
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+++ b/src/platforms/dev2/jtagtap.c
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+/*
+ * 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 JTAG TAP interface. */
+
+#include "general.h"
+
+#include "jtagtap.h"
+
+int jtagtap_init(void)
+{
+ /* Make sure TMS is still output (shared with SWDIO). */
+ uint8_t cmd[] = { DEV2_OP_DIR_OUT, TMS_PIN };
+ platform_buffer_write (cmd, sizeof (cmd));
+
+ /* Go to JTAG mode for SWJ-DP */
+ for(int i = 0; i <= 50; i++) jtagtap_next(1, 0); /* Reset SW-DP */
+ jtagtap_tms_seq(0xE73C, 16); /* SWD to JTAG sequence */
+ jtagtap_soft_reset();
+
+ return 0;
+}
+
+void jtagtap_reset(void)
+{
+ jtagtap_soft_reset();
+}
+
+void jtagtap_srst(bool assert)
+{
+ (void)assert;
+}
+
+inline uint8_t jtagtap_next(uint8_t dTMS, uint8_t dTDO)
+{
+ uint8_t cmd[] = {
+ DEV2_OP_OUT_CHANGE, TMS_PIN | TDI_PIN,
+ (dTMS ? TMS_PIN : 0) | (dTDO ? TDI_PIN : 0),
+ DEV2_OP_OUT_SET, TCK_PIN,
+ DEV2_OP_IN,
+ DEV2_OP_OUT_RESET, TCK_PIN,
+ };
+ platform_buffer_write (cmd, sizeof (cmd));
+ uint8_t rep[1];
+ platform_buffer_read (rep, sizeof (rep));
+ int ret = rep[0] & TDO_PIN;
+
+ DEBUG("jtagtap_next(TMS = %d, TDO = %d) = %d\n", dTMS, dTDO, ret);
+
+ return ret != 0;
+}
+
+
+
+#define PROVIDE_GENERIC_JTAGTAP_TMS_SEQ
+#define PROVIDE_GENERIC_JTAGTAP_TDI_TDO_SEQ
+#define PROVIDE_GENERIC_JTAGTAP_TDI_SEQ
+
+#include "jtagtap_generic.c"
+