-/***************************************************************************\r
- * Copyright (C) 2008 by Øyvind Harboe *\r
- * oyvind.harboe@zylin.com *\r
- * *\r
- * This program is free software; you can redistribute it and/or modify *\r
- * it under the terms of the GNU General Public License as published by *\r
- * the Free Software Foundation; either version 2 of the License, or *\r
- * (at your option) any later version. *\r
- * *\r
- * This program is distributed in the hope that it will be useful, *\r
- * but WITHOUT ANY WARRANTY; without even the implied warranty of *\r
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *\r
- * GNU General Public License for more details. *\r
- * *\r
- * You should have received a copy of the GNU General Public License *\r
- * along with this program; if not, write to the *\r
- * Free Software Foundation, Inc., *\r
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *\r
- ***************************************************************************/\r
-#ifdef HAVE_CONFIG_H\r
-#include "config.h"\r
-#endif\r
-\r
-#include "replacements.h"\r
-\r
-#include "jtag.h"\r
-#include "bitbang.h"\r
-\r
-\r
-/* my private tap controller state, which tracks state for calling code */\r
-static tap_state_t dummy_state = TAP_RESET;\r
-\r
-static int dummy_clock; /* edge detector */\r
-\r
-static tap_state_t tap_state_transition(tap_state_t cur_state, int tms);\r
-\r
-\r
-int dummy_speed(int speed);\r
-int dummy_register_commands(struct command_context_s *cmd_ctx);\r
-int dummy_init(void);\r
-int dummy_quit(void);\r
-static int dummy_khz(int khz, int *jtag_speed);\r
-static int dummy_speed_div(int speed, int *khz);\r
-\r
-\r
-/* The dummy driver is used to easily check the code path\r
- * where the target is unresponsive.\r
- */\r
-jtag_interface_t dummy_interface =\r
-{\r
- .name = "dummy",\r
-\r
- .execute_queue = bitbang_execute_queue,\r
-\r
- .speed = dummy_speed,\r
- .register_commands = dummy_register_commands,\r
- .khz = dummy_khz,\r
- .speed_div = dummy_speed_div,\r
-\r
- .init = dummy_init,\r
- .quit = dummy_quit,\r
-};\r
-\r
-int dummy_read(void);\r
-void dummy_write(int tck, int tms, int tdi);\r
-void dummy_reset(int trst, int srst);\r
-void dummy_led(int on);\r
-\r
-bitbang_interface_t dummy_bitbang =\r
-{\r
- .read = dummy_read,\r
- .write = dummy_write,\r
- .reset = dummy_reset,\r
- .blink = dummy_led\r
-};\r
-\r
-int dummy_read(void)\r
-{\r
- return 1;\r
-}\r
-\r
-\r
-void dummy_write(int tck, int tms, int tdi)\r
-{\r
- /* TAP standard: "state transitions occur on rising edge of clock" */\r
- if( tck != dummy_clock )\r
- {\r
- if( tck )\r
- {\r
- int old_state = dummy_state;\r
- dummy_state = tap_state_transition( dummy_state, tms );\r
- if( old_state != dummy_state )\r
- LOG_INFO( "dummy_tap=%s", jtag_state_name(dummy_state) );\r
- }\r
- dummy_clock = tck;\r
- }\r
-}\r
-\r
-void dummy_reset(int trst, int srst)\r
-{\r
- dummy_clock = 0;\r
- dummy_state = TAP_RESET;\r
- LOG_DEBUG( "reset to %s", jtag_state_name(dummy_state) );\r
-}\r
-\r
-static int dummy_khz(int khz, int *jtag_speed)\r
-{\r
- if (khz==0)\r
- {\r
- *jtag_speed=0;\r
- }\r
- else\r
- {\r
- *jtag_speed=64000/khz;\r
- }\r
- return ERROR_OK;\r
-}\r
-\r
-static int dummy_speed_div(int speed, int *khz)\r
-{\r
- if (speed==0)\r
- {\r
- *khz = 0;\r
- }\r
- else\r
- {\r
- *khz=64000/speed;\r
- }\r
-\r
- return ERROR_OK;\r
-}\r
-\r
-int dummy_speed(int speed)\r
-{\r
- return ERROR_OK;\r
-}\r
-\r
-int dummy_register_commands(struct command_context_s *cmd_ctx)\r
-{\r
- return ERROR_OK;\r
-}\r
-\r
-int dummy_init(void)\r
-{\r
- bitbang_interface = &dummy_bitbang;\r
-\r
- return ERROR_OK;\r
-}\r
-\r
-int dummy_quit(void)\r
-{\r
- return ERROR_OK;\r
-}\r
-\r
-void dummy_led(int on)\r
-{\r
-}\r
-\r
-\r
-/**\r
- * Function tap_state_transition\r
- * takes a current TAP state and returns the next state according to the tms value.\r
- *\r
- * Even though there is code to duplicate this elsewhere, we do it here a little\r
- * differently just to get a second opinion, i.e. a verification, on state tracking\r
- * in that other logic. Plus array lookups without index checking are no favorite thing.\r
- * This is educational for developers new to TAP controllers.\r
- */\r
-static tap_state_t tap_state_transition(tap_state_t cur_state, int tms)\r
-{\r
- tap_state_t new_state;\r
-\r
- if (tms)\r
- {\r
- switch (cur_state)\r
- {\r
- case TAP_RESET:\r
- new_state = cur_state;\r
- break;\r
- case TAP_IDLE:\r
- case TAP_DRUPDATE:\r
- case TAP_IRUPDATE:\r
- new_state = TAP_DRSELECT;\r
- break;\r
- case TAP_DRSELECT:\r
- new_state = TAP_IRSELECT;\r
- break;\r
- case TAP_DRCAPTURE:\r
- case TAP_DRSHIFT:\r
- new_state = TAP_DREXIT1;\r
- break;\r
- case TAP_DREXIT1:\r
- case TAP_DREXIT2:\r
- new_state = TAP_DRUPDATE;\r
- break;\r
- case TAP_DRPAUSE:\r
- new_state = TAP_DREXIT2;\r
- break;\r
- case TAP_IRSELECT:\r
- new_state = TAP_RESET;\r
- break;\r
- case TAP_IRCAPTURE:\r
- case TAP_IRSHIFT:\r
- new_state = TAP_IREXIT1;\r
- break;\r
- case TAP_IREXIT1:\r
- case TAP_IREXIT2:\r
- new_state = TAP_IRUPDATE;\r
- break;\r
- case TAP_IRPAUSE:\r
- new_state = TAP_IREXIT2;\r
- break;\r
- default:\r
- LOG_ERROR( "fatal: invalid argument cur_state=%d", cur_state );\r
- exit(1);\r
- break;\r
- }\r
- }\r
- else\r
- {\r
- switch (cur_state)\r
- {\r
- case TAP_RESET:\r
- case TAP_IDLE:\r
- case TAP_DRUPDATE:\r
- case TAP_IRUPDATE:\r
- new_state = TAP_IDLE;\r
- break;\r
- case TAP_DRSELECT:\r
- new_state = TAP_DRCAPTURE;\r
- break;\r
- case TAP_DRCAPTURE:\r
- case TAP_DRSHIFT:\r
- case TAP_DREXIT2:\r
- new_state = TAP_DRSHIFT;\r
- break;\r
- case TAP_DREXIT1:\r
- case TAP_DRPAUSE:\r
- new_state = TAP_DRPAUSE;\r
- break;\r
- case TAP_IRSELECT:\r
- new_state = TAP_IRCAPTURE;\r
- break;\r
- case TAP_IRCAPTURE:\r
- case TAP_IRSHIFT:\r
- case TAP_IREXIT2:\r
- new_state = TAP_IRSHIFT;\r
- break;\r
- case TAP_IREXIT1:\r
- case TAP_IRPAUSE:\r
- new_state = TAP_IRPAUSE;\r
- break;\r
- default:\r
- LOG_ERROR( "fatal: invalid argument cur_state=%d", cur_state );\r
- exit(1);\r
- break;\r
- }\r
- }\r
-\r
- return new_state;\r
-}\r
+/***************************************************************************
+ * Copyright (C) 2008 by Øyvind Harboe *
+ * oyvind.harboe@zylin.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. *
+ ***************************************************************************/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "interface.h"
+#include "bitbang.h"
+
+
+/* my private tap controller state, which tracks state for calling code */
+static tap_state_t dummy_state = TAP_RESET;
+
+static int dummy_clock; /* edge detector */
+
+static int clock_count; /* count clocks in any stable state, only stable states */
+
+static uint32_t dummy_data;
+
+
+static int dummy_speed(int speed);
+static int dummy_register_commands(struct command_context_s *cmd_ctx);
+static int dummy_init(void);
+static int dummy_quit(void);
+static int dummy_khz(int khz, int *jtag_speed);
+static int dummy_speed_div(int speed, int *khz);
+
+
+/* The dummy driver is used to easily check the code path
+ * where the target is unresponsive.
+ */
+jtag_interface_t dummy_interface =
+{
+ .name = "dummy",
+
+ .execute_queue = bitbang_execute_queue,
+
+ .speed = dummy_speed,
+ .register_commands = dummy_register_commands,
+ .khz = dummy_khz,
+ .speed_div = dummy_speed_div,
+
+ .init = dummy_init,
+ .quit = dummy_quit,
+};
+
+static int dummy_read(void);
+static void dummy_write(int tck, int tms, int tdi);
+static void dummy_reset(int trst, int srst);
+static void dummy_led(int on);
+
+static bitbang_interface_t dummy_bitbang =
+{
+ .read = dummy_read,
+ .write = dummy_write,
+ .reset = dummy_reset,
+ .blink = dummy_led
+};
+
+static int dummy_read(void)
+{
+ int data = 1 & dummy_data;
+ dummy_data = (dummy_data >> 1) | (1 << 31);
+ return data;
+}
+
+
+static void dummy_write(int tck, int tms, int tdi)
+{
+ /* TAP standard: "state transitions occur on rising edge of clock" */
+ if ( tck != dummy_clock )
+ {
+ if ( tck )
+ {
+ tap_state_t old_state = dummy_state;
+ dummy_state = tap_state_transition( old_state, tms );
+
+ if ( old_state != dummy_state )
+ {
+ if ( clock_count )
+ {
+ LOG_DEBUG("dummy_tap: %d stable clocks", clock_count);
+ clock_count = 0;
+ }
+
+ LOG_DEBUG("dummy_tap: %s", tap_state_name(dummy_state) );
+
+#if defined(DEBUG)
+ if (dummy_state == TAP_DRCAPTURE)
+ dummy_data = 0x01255043;
+#endif
+ }
+ else
+ {
+ /* this is a stable state clock edge, no change of state here,
+ * simply increment clock_count for subsequent logging
+ */
+ ++clock_count;
+ }
+ }
+ dummy_clock = tck;
+ }
+}
+
+static void dummy_reset(int trst, int srst)
+{
+ dummy_clock = 0;
+
+ if (trst || (srst && (jtag_get_reset_config() & RESET_SRST_PULLS_TRST)))
+ dummy_state = TAP_RESET;
+
+ LOG_DEBUG("reset to: %s", tap_state_name(dummy_state) );
+}
+
+static int dummy_khz(int khz, int *jtag_speed)
+{
+ if (khz==0)
+ {
+ *jtag_speed=0;
+ }
+ else
+ {
+ *jtag_speed=64000/khz;
+ }
+ return ERROR_OK;
+}
+
+static int dummy_speed_div(int speed, int *khz)
+{
+ if (speed==0)
+ {
+ *khz = 0;
+ }
+ else
+ {
+ *khz=64000/speed;
+ }
+
+ return ERROR_OK;
+}
+
+static int dummy_speed(int speed)
+{
+ return ERROR_OK;
+}
+
+static int dummy_register_commands(struct command_context_s *cmd_ctx)
+{
+ return ERROR_OK;
+}
+
+static int dummy_init(void)
+{
+ bitbang_interface = &dummy_bitbang;
+
+ return ERROR_OK;
+}
+
+static int dummy_quit(void)
+{
+ return ERROR_OK;
+}
+
+static void dummy_led(int on)
+{
+}
+
Code Review / openocd.git / blobdiff