diff options
| -rw-r--r-- | src/jtag/core.c | 88 | ||||
| -rw-r--r-- | src/jtag/jtag.h | 66 |
2 files changed, 77 insertions, 77 deletions
diff --git a/src/jtag/core.c b/src/jtag/core.c index 2786650..1c14c8e 100644 --- a/src/jtag/core.c +++ b/src/jtag/core.c @@ -476,6 +476,50 @@ void jtag_add_pathmove(int num_states, const tap_state_t *path) cmd_queue_cur_state = path[num_states - 1]; } +int jtag_add_statemove(tap_state_t goal_state) +{ + tap_state_t cur_state = cmd_queue_cur_state; + + LOG_DEBUG( "cur_state=%s goal_state=%s", + tap_state_name(cur_state), + tap_state_name(goal_state) ); + + + if (goal_state==cur_state ) + ; /* nothing to do */ + else if( goal_state==TAP_RESET ) + { + jtag_add_tlr(); + } + else if( tap_is_state_stable(cur_state) && tap_is_state_stable(goal_state) ) + { + unsigned tms_bits = tap_get_tms_path(cur_state, goal_state); + unsigned tms_count = tap_get_tms_path_len(cur_state, goal_state); + tap_state_t moves[8]; + assert(tms_count < DIM(moves)); + + for (unsigned i = 0; i < tms_count; i++, tms_bits >>= 1) + { + bool bit = tms_bits & 1; + + cur_state = tap_state_transition(cur_state, bit); + moves[i] = cur_state; + } + + jtag_add_pathmove(tms_count, moves); + } + else if( tap_state_transition(cur_state, true) == goal_state + || tap_state_transition(cur_state, false) == goal_state ) + { + jtag_add_pathmove(1, &goal_state); + } + + else + return ERROR_FAIL; + + return ERROR_OK; +} + void jtag_add_runtest(int num_cycles, tap_state_t state) { jtag_prelude(state); @@ -1249,50 +1293,6 @@ int jtag_srst_asserted(int *srst_asserted) return jtag->srst_asserted(srst_asserted); } -int jtag_add_statemove(tap_state_t goal_state) -{ - tap_state_t cur_state = cmd_queue_cur_state; - - LOG_DEBUG( "cur_state=%s goal_state=%s", - tap_state_name(cur_state), - tap_state_name(goal_state) ); - - - if (goal_state==cur_state ) - ; /* nothing to do */ - else if( goal_state==TAP_RESET ) - { - jtag_add_tlr(); - } - else if( tap_is_state_stable(cur_state) && tap_is_state_stable(goal_state) ) - { - unsigned tms_bits = tap_get_tms_path(cur_state, goal_state); - unsigned tms_count = tap_get_tms_path_len(cur_state, goal_state); - tap_state_t moves[8]; - assert(tms_count < DIM(moves)); - - for (unsigned i = 0; i < tms_count; i++, tms_bits >>= 1) - { - bool bit = tms_bits & 1; - - cur_state = tap_state_transition(cur_state, bit); - moves[i] = cur_state; - } - - jtag_add_pathmove(tms_count, moves); - } - else if( tap_state_transition(cur_state, true) == goal_state - || tap_state_transition(cur_state, false) == goal_state ) - { - jtag_add_pathmove(1, &goal_state); - } - - else - return ERROR_FAIL; - - return ERROR_OK; -} - enum reset_types jtag_get_reset_config(void) { return jtag_reset_config; diff --git a/src/jtag/jtag.h b/src/jtag/jtag.h index dcdad8e..9ce7347 100644 --- a/src/jtag/jtag.h +++ b/src/jtag/jtag.h @@ -508,6 +508,39 @@ extern void jtag_add_tlr(void); extern 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. + * + * This needs to be handled according to the xsvf spec, see the XSTATE + * command description. From the XSVF spec, pertaining to XSTATE: + * + * For special states known as stable states (Test-Logic-Reset, + * Run-Test/Idle, Pause-DR, Pause- IR), an XSVF interpreter follows + * predefined TAP state paths when the starting state is a stable state + * and when the XSTATE specifies a new stable state. See the STATE + * command in the [Ref 5] for the TAP state paths between stable + * states. + * + * For non-stable states, XSTATE should specify a state that is only one + * TAP state transition distance from the current TAP state to avoid + * undefined TAP state paths. A sequence of multiple XSTATE commands can + * be issued to transition the TAP through a specific state path. + * + * @note Unless @c tms_bits holds a path that agrees with [Ref 5] in the + * above spec, then this code is not fully conformant to the xsvf spec. + * This puts a burden on tap_get_tms_path() function from the xsvf spec. + * If in doubt, you should confirm that that burden is being met. + * + * Otherwise, @a goal_state must be immediately reachable in one clock + * cycle, and does not need to be a stable state. + */ +extern 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). @@ -674,39 +707,6 @@ extern void jtag_add_dr_out(jtag_tap_t* tap, tap_state_t end_state); -/** - * 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. - * - * This needs to be handled according to the xsvf spec, see the XSTATE - * command description. From the XSVF spec, pertaining to XSTATE: - * - * For special states known as stable states (Test-Logic-Reset, - * Run-Test/Idle, Pause-DR, Pause- IR), an XSVF interpreter follows - * predefined TAP state paths when the starting state is a stable state - * and when the XSTATE specifies a new stable state. See the STATE - * command in the [Ref 5] for the TAP state paths between stable - * states. - * - * For non-stable states, XSTATE should specify a state that is only one - * TAP state transition distance from the current TAP state to avoid - * undefined TAP state paths. A sequence of multiple XSTATE commands can - * be issued to transition the TAP through a specific state path. - * - * @note Unless @c tms_bits holds a path that agrees with [Ref 5] in the - * above spec, then this code is not fully conformant to the xsvf spec. - * This puts a burden on tap_get_tms_path() function from the xsvf spec. - * If in doubt, you should confirm that that burden is being met. - * - * Otherwise, @a goal_state must be immediately reachable in one clock - * cycle, and does not need to be a stable state. - */ -extern int jtag_add_statemove(tap_state_t goal_state); - /// @returns the number of times the scan queue has been flushed int jtag_get_flush_queue_count(void); |