diff options
Diffstat (limited to 'src')
-rw-r--r-- | src/jtag/jtag.c | 87 | ||||
-rw-r--r-- | src/jtag/jtag.h | 10 | ||||
-rw-r--r-- | src/xsvf/xsvf.c | 103 |
3 files changed, 106 insertions, 94 deletions
diff --git a/src/jtag/jtag.c b/src/jtag/jtag.c index c9167f4..4ed0897 100644 --- a/src/jtag/jtag.c +++ b/src/jtag/jtag.c @@ -3719,3 +3719,90 @@ static int handle_tms_sequence_command(struct command_context_s *cmd_ctx, char * } /*-----</Cable Helper API>--------------------------------------*/ + + +/** + * Function jtag_add_statemove + * 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. + */ +int jtag_add_statemove(tap_state_t goal_state) +{ + int retval = ERROR_OK; + + tap_state_t moves[8]; + tap_state_t cur_state = cmd_queue_cur_state; + int i; + int tms_bits; + int tms_count; + + LOG_DEBUG( "cur_state=%s goal_state=%s", + tap_state_name(cur_state), + tap_state_name(goal_state) ); + + + /* 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. + */ + + 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) ) + { + /* note: unless tms_bits holds a path that agrees with [Ref 5] in 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. + */ + + tms_bits = tap_get_tms_path(cur_state, goal_state); + tms_count = tap_get_tms_path_len(cur_state, goal_state); + + assert( (unsigned) tms_count < DIM(moves) ); + + for (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 state must be immediately reachable in one clock cycle, and does not + need to be a stable state. + */ + else if( tap_state_transition(cur_state, true) == goal_state + || tap_state_transition(cur_state, false) == goal_state ) + { + /* move a single state */ + moves[0] = goal_state; + jtag_add_pathmove( 1, moves ); + } + + else + { + retval = ERROR_FAIL; + } + + return retval; +} + diff --git a/src/jtag/jtag.h b/src/jtag/jtag.h index 00a7bc8..989c088 100644 --- a/src/jtag/jtag.h +++ b/src/jtag/jtag.h @@ -894,4 +894,14 @@ static __inline__ void jtag_add_dr_out(jtag_tap_t* tap, int num_fields, const in } + + +/** + * Function jtag_add_statemove + * 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. + */ +extern int jtag_add_statemove(tap_state_t goal_state); + #endif /* JTAG_H */ diff --git a/src/xsvf/xsvf.c b/src/xsvf/xsvf.c index f2d3aa1..0ec9f4d 100644 --- a/src/xsvf/xsvf.c +++ b/src/xsvf/xsvf.c @@ -160,91 +160,6 @@ static tap_state_t xsvf_to_tap( int xsvf_state ) } -/** - * Function xsvf_add_statemove - * 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. - */ -static int xsvf_add_statemove(tap_state_t goal_state) -{ - int retval = ERROR_OK; - - tap_state_t moves[8]; - tap_state_t cur_state = cmd_queue_cur_state; - int i; - int tms_bits; - int tms_count; - - LOG_DEBUG( "cur_state=%s goal_state=%s", - tap_state_name(cur_state), - tap_state_name(goal_state) ); - - - /* 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. - */ - - 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) ) - { - /* note: unless tms_bits holds a path that agrees with [Ref 5] in 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. - */ - - tms_bits = tap_get_tms_path(cur_state, goal_state); - tms_count = tap_get_tms_path_len(cur_state, goal_state); - - assert( (unsigned) tms_count < DIM(moves) ); - - for (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 state must be immediately reachable in one clock cycle, and does not - need to be a stable state. - */ - else if( tap_state_transition(cur_state, true) == goal_state - || tap_state_transition(cur_state, false) == goal_state ) - { - /* move a single state */ - moves[0] = goal_state; - jtag_add_pathmove( 1, moves ); - } - - else - { - retval = ERROR_FAIL; - } - - return retval; -} - int xsvf_register_commands(struct command_context_s *cmd_ctx) { @@ -518,7 +433,7 @@ static int handle_xsvf_command(struct command_context_s *cmd_ctx, char *cmd, cha /* See page 19 of XSVF spec regarding opcode "XSDR" */ if (xruntest) { - xsvf_add_statemove(TAP_IDLE); + jtag_add_statemove(TAP_IDLE); if (runtest_requires_tck) jtag_add_clocks(xruntest); @@ -526,7 +441,7 @@ static int handle_xsvf_command(struct command_context_s *cmd_ctx, char *cmd, cha jtag_add_sleep(xruntest); } else if (xendir != TAP_DRPAUSE) /* we are already in TAP_DRPAUSE */ - xsvf_add_statemove(xenddr); + jtag_add_statemove(xenddr); } break; @@ -590,7 +505,7 @@ static int handle_xsvf_command(struct command_context_s *cmd_ctx, char *cmd, cha the XSTATE. */ - if( xsvf_add_statemove( mystate ) != ERROR_OK ) + if( jtag_add_statemove( mystate ) != ERROR_OK ) { /* For special states known as stable states (Test-Logic-Reset, Run-Test/Idle, Pause-DR, Pause- IR), @@ -794,9 +709,9 @@ static int handle_xsvf_command(struct command_context_s *cmd_ctx, char *cmd, cha } else { - xsvf_add_statemove( wait_state ); + jtag_add_statemove( wait_state ); jtag_add_sleep(delay); - xsvf_add_statemove( end_state ); + jtag_add_statemove( end_state ); } } break; @@ -847,13 +762,13 @@ static int handle_xsvf_command(struct command_context_s *cmd_ctx, char *cmd, cha unsupported = 1; } - xsvf_add_statemove( wait_state ); + jtag_add_statemove( wait_state ); jtag_add_clocks( clock_count ); jtag_add_sleep( usecs ); - xsvf_add_statemove( end_state ); + jtag_add_statemove( end_state ); } break; @@ -925,7 +840,7 @@ static int handle_xsvf_command(struct command_context_s *cmd_ctx, char *cmd, cha { scan_field_t field; - xsvf_add_statemove( loop_state ); + jtag_add_statemove( loop_state ); jtag_add_clocks(loop_clocks); jtag_add_sleep(loop_usecs); @@ -1003,7 +918,7 @@ static int handle_xsvf_command(struct command_context_s *cmd_ctx, char *cmd, cha LOG_DEBUG("xsvf failed, setting taps to reasonable state"); /* upon error, return the TAPs to a reasonable state */ - xsvf_add_statemove( TAP_IDLE ); + jtag_add_statemove( TAP_IDLE ); jtag_execute_queue(); break; } |