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added jtag_add_statemove() helper fn(actual fn written by Dick Hollonbeck, I just moved it).

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git-svn-id: svn://svn.berlios.de/openocd/trunk@1980 b42882b7-edfa-0310-969c-e2dbd0fdcd60
This commit is contained in:
oharboe 2009-06-01 19:58:20 +00:00
parent 414245c9ce
commit 7662bbeaa5
3 changed files with 106 additions and 94 deletions
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87
src/jtag/jtag.c
View File

@ -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;
}

10
src/jtag/jtag.h
View File

@ -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 */

103
src/xsvf/xsvf.c
View File

@ -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;
}