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- /***************************************************************************
- * Copyright (C) 2005 by Dominic Rath *
- * Dominic.Rath@gmx.de *
- * *
- * Copyright (C) 2007,2008 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. *
- ***************************************************************************/
- #ifndef JTAG_H
- #define JTAG_H
-
- #include <helper/binarybuffer.h>
- #include <helper/log.h>
-
- #ifdef _DEBUG_JTAG_IO_
- #define DEBUG_JTAG_IO(expr ...) \
- do { if (1) LOG_DEBUG(expr); } while (0)
- #else
- #define DEBUG_JTAG_IO(expr ...) \
- do { if (0) LOG_DEBUG(expr); } while (0)
- #endif
-
- #ifndef DEBUG_JTAG_IOZ
- #define DEBUG_JTAG_IOZ 64
- #endif
-
- /*-----</Macros>-------------------------------------------------*/
-
- /**
- * Defines JTAG Test Access Port states.
- *
- * These definitions were gleaned from the ARM7TDMI-S Technical
- * Reference Manual and validated against several other ARM core
- * technical manuals.
- *
- * FIXME some interfaces require specific numbers be used, as they
- * are handed-off directly to their hardware implementations.
- * Fix those drivers to map as appropriate ... then pick some
- * sane set of numbers here (where 0/uninitialized == INVALID).
- */
- typedef enum tap_state
- {
- TAP_INVALID = -1,
-
- #if BUILD_ZY1000
- /* These are the old numbers. Leave as-is for now... */
- TAP_RESET = 0, TAP_IDLE = 8,
- TAP_DRSELECT = 1, TAP_DRCAPTURE = 2, TAP_DRSHIFT = 3, TAP_DREXIT1 = 4,
- TAP_DRPAUSE = 5, TAP_DREXIT2 = 6, TAP_DRUPDATE = 7,
- TAP_IRSELECT = 9, TAP_IRCAPTURE = 10, TAP_IRSHIFT = 11, TAP_IREXIT1 = 12,
- TAP_IRPAUSE = 13, TAP_IREXIT2 = 14, TAP_IRUPDATE = 15,
-
- #else
- /* Proper ARM recommended numbers */
- TAP_DREXIT2 = 0x0,
- TAP_DREXIT1 = 0x1,
- TAP_DRSHIFT = 0x2,
- TAP_DRPAUSE = 0x3,
- TAP_IRSELECT = 0x4,
- TAP_DRUPDATE = 0x5,
- TAP_DRCAPTURE = 0x6,
- TAP_DRSELECT = 0x7,
- TAP_IREXIT2 = 0x8,
- TAP_IREXIT1 = 0x9,
- TAP_IRSHIFT = 0xa,
- TAP_IRPAUSE = 0xb,
- TAP_IDLE = 0xc,
- TAP_IRUPDATE = 0xd,
- TAP_IRCAPTURE = 0xe,
- TAP_RESET = 0x0f,
-
- #endif
- } tap_state_t;
-
- /**
- * Function tap_state_name
- * Returns a string suitable for display representing the JTAG tap_state
- */
- const char *tap_state_name(tap_state_t state);
-
- /// Provides user-friendly name lookup of TAP states.
- tap_state_t tap_state_by_name(const char *name);
-
- /// The current TAP state of the pending JTAG command queue.
- extern tap_state_t cmd_queue_cur_state;
-
- /**
- * This structure defines a single scan field in the scan. It provides
- * fields for the field's width and pointers to scan input and output
- * values.
- *
- * In addition, this structure includes a value and mask that is used by
- * jtag_add_dr_scan_check() to validate the value that was scanned out.
- *
- * The allocated, modified, and intmp fields are internal work space.
- */
- struct scan_field {
- /// A pointer to the tap structure to which this field refers.
- struct jtag_tap* tap;
-
- /// The number of bits this field specifies (up to 32)
- int num_bits;
- /// A pointer to value to be scanned into the device
- uint8_t* out_value;
- /// A pointer to a 32-bit memory location for data scanned out
- uint8_t* in_value;
-
- /// The value used to check the data scanned out.
- uint8_t* check_value;
- /// The mask to go with check_value
- uint8_t* check_mask;
-
- /// in_value has been allocated for the queue
- int allocated;
- /// Indicates we modified the in_value.
- int modified;
- /// temporary storage for performing value checks synchronously
- uint8_t intmp[4];
- };
-
- struct jtag_tap {
- const char* chip;
- const char* tapname;
- const char* dotted_name;
- int abs_chain_position;
- /// Is this TAP disabled after JTAG reset?
- bool disabled_after_reset;
- /// Is this TAP currently enabled?
- bool enabled;
- int ir_length; /**< size of instruction register */
- uint32_t ir_capture_value;
- uint8_t* expected; /**< Capture-IR expected value */
- uint32_t ir_capture_mask;
- uint8_t* expected_mask; /**< Capture-IR expected mask */
- uint32_t idcode; /**< device identification code */
- /** not all devices have idcode,
- * we'll discover this during chain examination */
- bool hasidcode;
-
- /// Array of expected identification codes */
- uint32_t* expected_ids;
- /// Number of expected identification codes
- uint8_t expected_ids_cnt;
-
- /// Flag saying whether to ignore version field in expected_ids[]
- bool ignore_version;
-
- /// current instruction
- uint8_t* cur_instr;
- /// Bypass register selected
- int bypass;
-
- struct jtag_tap_event_action *event_action;
-
- struct jtag_tap* next_tap;
- };
-
- void jtag_tap_init(struct jtag_tap *tap);
- void jtag_tap_free(struct jtag_tap *tap);
-
- struct jtag_tap* jtag_all_taps(void);
- const char *jtag_tap_name(const struct jtag_tap *tap);
- struct jtag_tap* jtag_tap_by_string(const char* dotted_name);
- struct jtag_tap* jtag_tap_by_jim_obj(Jim_Interp* interp, Jim_Obj* obj);
- struct jtag_tap* jtag_tap_next_enabled(struct jtag_tap* p);
- unsigned jtag_tap_count_enabled(void);
- unsigned jtag_tap_count(void);
-
-
- /*
- * - TRST_ASSERTED triggers two sets of callbacks, after operations to
- * reset the scan chain -- via TMS+TCK signaling, or deasserting the
- * nTRST signal -- are queued:
- *
- * + Callbacks in C code fire first, patching internal state
- * + Then post-reset event scripts fire ... activating JTAG circuits
- * via TCK cycles, exiting SWD mode via TMS sequences, etc
- *
- * During those callbacks, scan chain contents have not been validated.
- * JTAG operations that address a specific TAP (primarily DR/IR scans)
- * must *not* be queued.
- *
- * - TAP_EVENT_SETUP is reported after TRST_ASSERTED, and after the scan
- * chain has been validated. JTAG operations including scans that
- * target specific TAPs may be performed.
- *
- * - TAP_EVENT_ENABLE and TAP_EVENT_DISABLE implement TAP activation and
- * deactivation outside the core using scripted code that understands
- * the specific JTAG router type. They might be triggered indirectly
- * from EVENT_SETUP operations.
- */
- enum jtag_event {
- JTAG_TRST_ASSERTED,
- JTAG_TAP_EVENT_SETUP,
- JTAG_TAP_EVENT_ENABLE,
- JTAG_TAP_EVENT_DISABLE,
- };
-
- struct jtag_tap_event_action
- {
- /// The event for which this action will be triggered.
- enum jtag_event event;
- /// The interpreter to use for evaluating the @c body.
- Jim_Interp *interp;
- /// Contains a script to 'eval' when the @c event is triggered.
- Jim_Obj *body;
- // next action in linked list
- struct jtag_tap_event_action *next;
- };
-
- /**
- * Defines the function signature requide for JTAG event callback
- * functions, which are added with jtag_register_event_callback()
- * and removed jtag_unregister_event_callback().
- * @param event The event to handle.
- * @param prive A pointer to data that was passed to
- * jtag_register_event_callback().
- * @returns Must return ERROR_OK on success, or an error code on failure.
- *
- * @todo Change to return void or define a use for its return code.
- */
- typedef int (*jtag_event_handler_t)(enum jtag_event event, void* priv);
-
- int jtag_register_event_callback(jtag_event_handler_t f, void *x);
- int jtag_unregister_event_callback(jtag_event_handler_t f, void *x);
-
- int jtag_call_event_callbacks(enum jtag_event event);
-
-
- /// @returns The current JTAG speed setting.
- int jtag_get_speed(void);
-
- /**
- * Given a @a speed setting, use the interface @c speed_div callback to
- * adjust the setting.
- * @param speed The speed setting to convert back to readable KHz.
- * @returns ERROR_OK if the interface has not been initialized or on success;
- * otherwise, the error code produced by the @c speed_div callback.
- */
- int jtag_get_speed_readable(int *speed);
-
- /// Attempt to configure the interface for the specified KHz.
- int jtag_config_khz(unsigned khz);
-
- /**
- * Attempt to enable RTCK/RCLK. If that fails, fallback to the
- * specified frequency.
- */
- int jtag_config_rclk(unsigned fallback_speed_khz);
-
- /// Retreives the clock speed of the JTAG interface in KHz.
- unsigned jtag_get_speed_khz(void);
-
-
- enum reset_types {
- RESET_NONE = 0x0,
- RESET_HAS_TRST = 0x1,
- RESET_HAS_SRST = 0x2,
- RESET_TRST_AND_SRST = 0x3,
- RESET_SRST_PULLS_TRST = 0x4,
- RESET_TRST_PULLS_SRST = 0x8,
- RESET_TRST_OPEN_DRAIN = 0x10,
- RESET_SRST_PUSH_PULL = 0x20,
- RESET_SRST_NO_GATING = 0x40,
- };
-
- enum reset_types jtag_get_reset_config(void);
- void jtag_set_reset_config(enum reset_types type);
-
- void jtag_set_nsrst_delay(unsigned delay);
- unsigned jtag_get_nsrst_delay(void);
-
- void jtag_set_ntrst_delay(unsigned delay);
- unsigned jtag_get_ntrst_delay(void);
-
- void jtag_set_nsrst_assert_width(unsigned delay);
- unsigned jtag_get_nsrst_assert_width(void);
-
- void jtag_set_ntrst_assert_width(unsigned delay);
- unsigned jtag_get_ntrst_assert_width(void);
-
- /// @returns The current state of TRST.
- int jtag_get_trst(void);
- /// @returns The current state of SRST.
- int jtag_get_srst(void);
-
- /// Enable or disable data scan verification checking.
- void jtag_set_verify(bool enable);
- /// @returns True if data scan verification will be performed.
- bool jtag_will_verify(void);
-
- /// Enable or disable verification of IR scan checking.
- void jtag_set_verify_capture_ir(bool enable);
- /// @returns True if IR scan verification will be performed.
- bool jtag_will_verify_capture_ir(void);
-
- /**
- * Initialize interface upon startup. Return a successful no-op upon
- * subsequent invocations.
- */
- int jtag_interface_init(struct command_context* cmd_ctx);
-
- /// Shutdown the JTAG interface upon program exit.
- int jtag_interface_quit(void);
-
- /**
- * Initialize JTAG chain using only a RESET reset. If init fails,
- * try reset + init.
- */
- int jtag_init(struct command_context* cmd_ctx);
-
- /// reset, then initialize JTAG chain
- int jtag_init_reset(struct command_context* cmd_ctx);
- int jtag_register_commands(struct command_context* cmd_ctx);
- int jtag_init_inner(struct command_context *cmd_ctx);
-
- /**
- * @file
- * The JTAG interface can be implemented with a software or hardware fifo.
- *
- * TAP_DRSHIFT and TAP_IRSHIFT are illegal end states; however,
- * TAP_DRSHIFT/IRSHIFT can be emulated as end states, by using longer
- * scans.
- *
- * Code that is relatively insensitive to the path taken through state
- * machine (as long as it is JTAG compliant) can use @a endstate for
- * jtag_add_xxx_scan(). Otherwise, the pause state must be specified as
- * end state and a subsequent jtag_add_pathmove() must be issued.
- */
-
- /**
- * Generate an IR SCAN with a list of scan fields with one entry for
- * each enabled TAP.
- *
- * If the input field list contains an instruction value for a TAP then
- * that is used otherwise the TAP is set to bypass.
- *
- * TAPs for which no fields are passed are marked as bypassed for
- * subsequent DR SCANs.
- *
- */
- void jtag_add_ir_scan(int num_fields,
- struct scan_field* fields, tap_state_t endstate);
- /**
- * The same as jtag_add_ir_scan except no verification is performed out
- * the output values.
- */
- void jtag_add_ir_scan_noverify(int num_fields,
- const struct scan_field *fields, tap_state_t state);
- /**
- * Duplicate the scan fields passed into the function into an IR SCAN
- * command. This function assumes that the caller handles extra fields
- * for bypassed TAPs.
- */
- void jtag_add_plain_ir_scan(int num_fields,
- const struct scan_field* fields, tap_state_t endstate);
-
-
- /**
- * Set in_value to point to 32 bits of memory to scan into. This
- * function is a way to handle the case of synchronous and asynchronous
- * JTAG queues.
- *
- * In the event of an asynchronous queue execution the queue buffer
- * allocation method is used, for the synchronous case the temporary 32
- * bits come from the input field itself.
- */
- void jtag_alloc_in_value32(struct scan_field *field);
-
- /**
- * Generate a DR SCAN using the fields passed to the function.
- * For connected TAPs, the function checks in_fields and uses fields
- * specified there. For bypassed TAPs, the function generates a dummy
- * 1-bit field. The bypass status of TAPs is set by jtag_add_ir_scan().
- */
- void jtag_add_dr_scan(int num_fields,
- const struct scan_field* fields, tap_state_t endstate);
- /// A version of jtag_add_dr_scan() that uses the check_value/mask fields
- void jtag_add_dr_scan_check(int num_fields,
- struct scan_field* fields, tap_state_t endstate);
- /**
- * Duplicate the scan fields passed into the function into a DR SCAN
- * command. Unlike jtag_add_dr_scan(), this function assumes that the
- * caller handles extra fields for bypassed TAPs.
- */
- void jtag_add_plain_dr_scan(int num_fields,
- const struct scan_field* fields, tap_state_t endstate);
-
- /**
- * Defines the type of data passed to the jtag_callback_t interface.
- * The underlying type must allow storing an @c int or pointer type.
- */
- typedef intptr_t jtag_callback_data_t;
-
- /**
- * Defines a simple JTAG callback that can allow conversions on data
- * scanned in from an interface.
- *
- * This callback should only be used for conversion that cannot fail.
- * For conversion types or checks that can fail, use the more complete
- * variant: jtag_callback_t.
- */
- typedef void (*jtag_callback1_t)(jtag_callback_data_t data0);
-
- /// A simpler version of jtag_add_callback4().
- void jtag_add_callback(jtag_callback1_t, jtag_callback_data_t data0);
-
-
- /**
- * Defines the interface of the JTAG callback mechanism. Such
- * callbacks can be executed once the queue has been flushed.
- *
- * The JTAG queue can be executed synchronously or asynchronously.
- * Typically for USB, the queue is executed asynchronously. For
- * low-latency interfaces, the queue may be executed synchronously.
- *
- * The callback mechanism is very general and does not make many
- * assumptions about what the callback does or what its arguments are.
- * These callbacks are typically executed *after* the *entire* JTAG
- * queue has been executed for e.g. USB interfaces, and they are
- * guaranteeed to be invoked in the order that they were queued.
- *
- * If the execution of the queue fails before the callbacks, then --
- * depending on driver implementation -- the callbacks may or may not be
- * invoked.
- *
- * @todo Make that behavior consistent.
- *
- * @param data0 Typically used to point to the data to operate on.
- * Frequently this will be the data clocked in during a shift operation.
- * @param data1 An integer big enough to use as an @c int or a pointer.
- * @param data2 An integer big enough to use as an @c int or a pointer.
- * @param data3 An integer big enough to use as an @c int or a pointer.
- * @returns an error code
- */
- typedef int (*jtag_callback_t)(jtag_callback_data_t data0,
- jtag_callback_data_t data1,
- jtag_callback_data_t data2,
- jtag_callback_data_t data3);
-
- /**
- * Run a TAP_RESET reset where the end state is TAP_RESET,
- * regardless of the start state.
- */
- void jtag_add_tlr(void);
-
- /**
- * Application code *must* assume that interfaces will
- * implement transitions between states with different
- * paths and path lengths through the state diagram. The
- * path will vary across interface and also across versions
- * of the same interface over time. Even if the OpenOCD code
- * is unchanged, the actual path taken may vary over time
- * and versions of interface firmware or PCB revisions.
- *
- * Use jtag_add_pathmove() when specific transition sequences
- * are required.
- *
- * Do not use jtag_add_pathmove() unless you need to, but do use it
- * if you have to.
- *
- * DANGER! If the target is dependent upon a particular sequence
- * of transitions for things to work correctly(e.g. as a workaround
- * for an errata that contradicts the JTAG standard), then pathmove
- * must be used, even if some jtag interfaces happen to use the
- * desired path. Worse, the jtag interface used for testing a
- * particular implementation, could happen to use the "desired"
- * path when transitioning to/from end
- * state.
- *
- * A list of unambigious single clock state transitions, not
- * all drivers can support this, but it is required for e.g.
- * XScale and Xilinx support
- *
- * Note! TAP_RESET must not be used in the path!
- *
- * Note that the first on the list must be reachable
- * via a single transition from the current state.
- *
- * All drivers are required to implement jtag_add_pathmove().
- * However, if the pathmove sequence can not be precisely
- * executed, an interface_jtag_add_pathmove() or jtag_execute_queue()
- * must return an error. It is legal, but not recommended, that
- * a driver returns an error in all cases for a pathmove if it
- * can only implement a few transitions and therefore
- * a partial implementation of pathmove would have little practical
- * application.
- *
- * If an error occurs, jtag_error will contain one of these error codes:
- * - ERROR_JTAG_NOT_STABLE_STATE -- The final state was not stable.
- * - ERROR_JTAG_STATE_INVALID -- The path passed through TAP_RESET.
- * - ERROR_JTAG_TRANSITION_INVALID -- The path includes invalid
- * state transitions.
- */
- void jtag_add_pathmove(int num_states, const tap_state_t* path);
-
- /**
- * jtag_add_statemove() moves from the current state to @a goal_state.
- *
- * @param goal_state The final TAP state.
- * @return ERROR_OK on success, or an error code on failure.
- *
- * Moves from the current state to the goal \a state.
- * Both states must be stable.
- */
- int jtag_add_statemove(tap_state_t goal_state);
-
- /**
- * Goes to TAP_IDLE (if we're not already there), cycle
- * precisely num_cycles in the TAP_IDLE state, after which move
- * to @a endstate (unless it is also TAP_IDLE).
- *
- * @param num_cycles Number of cycles in TAP_IDLE state. This argument
- * may be 0, in which case this routine will navigate to @a endstate
- * via TAP_IDLE.
- * @param endstate The final state.
- */
- void jtag_add_runtest(int num_cycles, tap_state_t endstate);
-
- /**
- * A reset of the TAP state machine can be requested.
- *
- * Whether tms or trst reset is used depends on the capabilities of
- * the target and jtag interface(reset_config command configures this).
- *
- * srst can driver a reset of the TAP state machine and vice
- * versa
- *
- * Application code may need to examine value of jtag_reset_config
- * to determine the proper codepath
- *
- * DANGER! Even though srst drives trst, trst might not be connected to
- * the interface, and it might actually be *harmful* to assert trst in this case.
- *
- * This is why combinations such as "reset_config srst_only srst_pulls_trst"
- * are supported.
- *
- * only req_tlr_or_trst and srst can have a transition for a
- * call as the effects of transitioning both at the "same time"
- * are undefined, but when srst_pulls_trst or vice versa,
- * then trst & srst *must* be asserted together.
- */
- void jtag_add_reset(int req_tlr_or_trst, int srst);
-
-
- /**
- * Function jtag_set_end_state
- *
- * Set a global variable to \a state if \a state != TAP_INVALID.
- *
- * Return the value of the global variable.
- */
- tap_state_t jtag_set_end_state(tap_state_t state);
-
- /**
- * Function jtag_get_end_state
- *
- * Return the value of the global variable for end state
- */
- tap_state_t jtag_get_end_state(void);
-
- void jtag_add_sleep(uint32_t us);
-
- /**
- * Function jtag_add_clocks
- * first checks that the state in which the clocks are to be issued is
- * stable, then queues up num_cycles clocks for transmission.
- */
- void jtag_add_clocks(int num_cycles);
-
-
- /**
- * For software FIFO implementations, the queued commands can be executed
- * during this call or earlier. A sw queue might decide to push out
- * some of the jtag_add_xxx() operations once the queue is "big enough".
- *
- * This fn will return an error code if any of the prior jtag_add_xxx()
- * calls caused a failure, e.g. check failure. Note that it does not
- * matter if the operation was executed *before* jtag_execute_queue(),
- * jtag_execute_queue() will still return an error code.
- *
- * All jtag_add_xxx() calls that have in_handler != NULL will have been
- * executed when this fn returns, but if what has been queued only
- * clocks data out, without reading anything back, then JTAG could
- * be running *after* jtag_execute_queue() returns. The API does
- * not define a way to flush a hw FIFO that runs *after*
- * jtag_execute_queue() returns.
- *
- * jtag_add_xxx() commands can either be executed immediately or
- * at some time between the jtag_add_xxx() fn call and jtag_execute_queue().
- */
- int jtag_execute_queue(void);
-
- /// same as jtag_execute_queue() but does not clear the error flag
- void jtag_execute_queue_noclear(void);
-
- /// @returns the number of times the scan queue has been flushed
- int jtag_get_flush_queue_count(void);
-
- /// Report Tcl event to all TAPs
- void jtag_notify_event(enum jtag_event);
-
-
- /* can be implemented by hw + sw */
- int jtag_power_dropout(int* dropout);
- int jtag_srst_asserted(int* srst_asserted);
-
- /* JTAG support functions */
-
- /**
- * Execute jtag queue and check value with an optional mask.
- * @param field Pointer to scan field.
- * @param value Pointer to scan value.
- * @param mask Pointer to scan mask; may be NULL.
- * @returns Nothing, but calls jtag_set_error() on any error.
- */
- void jtag_check_value_mask(struct scan_field *field, uint8_t *value, uint8_t *mask);
-
- void jtag_sleep(uint32_t us);
-
- /*
- * The JTAG subsystem defines a number of error codes,
- * using codes between -100 and -199.
- */
- #define ERROR_JTAG_INIT_FAILED (-100)
- #define ERROR_JTAG_INVALID_INTERFACE (-101)
- #define ERROR_JTAG_NOT_IMPLEMENTED (-102)
- #define ERROR_JTAG_TRST_ASSERTED (-103)
- #define ERROR_JTAG_QUEUE_FAILED (-104)
- #define ERROR_JTAG_NOT_STABLE_STATE (-105)
- #define ERROR_JTAG_DEVICE_ERROR (-107)
- #define ERROR_JTAG_STATE_INVALID (-108)
- #define ERROR_JTAG_TRANSITION_INVALID (-109)
- #define ERROR_JTAG_INIT_SOFT_FAIL (-110)
-
- /**
- * jtag_add_dr_out() is a version of jtag_add_dr_scan() which
- * only scans data out. It operates on 32 bit integers instead
- * of 8 bit, which makes it a better impedance match with
- * the calling code which often operate on 32 bit integers.
- *
- * Current or end_state can not be TAP_RESET. end_state can be TAP_INVALID
- *
- * num_bits[i] is the number of bits to clock out from value[i] LSB first.
- *
- * If the device is in bypass, then that is an error condition in
- * the caller code that is not detected by this fn, whereas
- * jtag_add_dr_scan() does detect it. Similarly if the device is not in
- * bypass, data must be passed to it.
- *
- * If anything fails, then jtag_error will be set and jtag_execute() will
- * return an error. There is no way to determine if there was a failure
- * during this function call.
- *
- * This is an inline fn to speed up embedded hosts. Also note that
- * interface_jtag_add_dr_out() can be a *small* inline function for
- * embedded hosts.
- *
- * There is no jtag_add_dr_outin() version of this fn that also allows
- * clocking data back in. Patches gladly accepted!
- */
-
-
- /**
- * Set the current JTAG core execution error, unless one was set
- * by a previous call previously. Driver or application code must
- * use jtag_error_clear to reset jtag_error once this routine has been
- * called with a non-zero error code.
- */
- void jtag_set_error(int error);
- /// @returns The current value of jtag_error
- int jtag_get_error(void);
- /**
- * Resets jtag_error to ERROR_OK, returning its previous value.
- * @returns The previous value of @c jtag_error.
- */
- int jtag_error_clear(void);
-
- /**
- * Return true if it's safe for a background polling task to access the
- * JTAG scan chain. Polling may be explicitly disallowed, and is also
- * unsafe while nTRST is active or the JTAG clock is gated off.,
- */
- bool is_jtag_poll_safe(void);
-
- /**
- * Return flag reporting whether JTAG polling is disallowed.
- */
- bool jtag_poll_get_enabled(void);
-
- /**
- * Assign flag reporting whether JTAG polling is disallowed.
- */
- void jtag_poll_set_enabled(bool value);
-
-
- /* The minidriver may have inline versions of some of the low
- * level APIs that are used in inner loops. */
- #include <jtag/minidriver.h>
-
- #endif /* JTAG_H */
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