#include <stdlib.h>
#include <unistd.h>
+
+/**
+ * Function bitbang_stableclocks
+ * issues a number of clock cycles while staying in a stable state.
+ * Because the TMS value required to stay in the RESET state is a 1, whereas
+ * the TMS value required to stay in any of the other stable states is a 0,
+ * this function checks the current stable state to decide on the value of TMS
+ * to use.
+ */
+static void bitbang_stableclocks(int num_cycles);
+
+
bitbang_interface_t *bitbang_interface;
/* DANGER!!!! clock absolutely *MUST* be 0 in idle or reset won't work!
*/
#define CLOCK_IDLE() 0
-int bitbang_execute_queue(void);
/* The bitbang driver leaves the TCK 0 when in idle */
-
-void bitbang_end_state(enum tap_state state)
+static void bitbang_end_state(tap_state_t state)
{
- if (tap_move_map[state] != -1)
- end_state = state;
+ if (tap_is_state_stable(state))
+ tap_set_end_state(state);
else
{
LOG_ERROR("BUG: %i is not a valid end state", state);
}
}
-void bitbang_state_move(void) {
-
+static void bitbang_state_move(void)
+{
int i=0, tms=0;
- u8 tms_scan = TAP_MOVE(cur_state, end_state);
+ u8 tms_scan = tap_get_tms_path(tap_get_state(), tap_get_end_state());
for (i = 0; i < 7; i++)
{
}
bitbang_interface->write(CLOCK_IDLE(), tms, 0);
- cur_state = end_state;
+ tap_set_state(tap_get_end_state());
}
-void bitbang_path_move(pathmove_command_t *cmd)
+static void bitbang_path_move(pathmove_command_t *cmd)
{
int num_states = cmd->num_states;
int state_count;
state_count = 0;
while (num_states)
{
- if (tap_transitions[cur_state].low == cmd->path[state_count])
+ if (tap_state_transition(tap_get_state(), false) == cmd->path[state_count])
{
tms = 0;
}
- else if (tap_transitions[cur_state].high == cmd->path[state_count])
+ else if (tap_state_transition(tap_get_state(), true) == cmd->path[state_count])
{
tms = 1;
}
else
{
- LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_strings[cur_state], tap_state_strings[cmd->path[state_count]]);
+ LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_name(tap_get_state()), tap_state_name(cmd->path[state_count]));
exit(-1);
}
bitbang_interface->write(0, tms, 0);
bitbang_interface->write(1, tms, 0);
- cur_state = cmd->path[state_count];
+ tap_set_state(cmd->path[state_count]);
state_count++;
num_states--;
}
bitbang_interface->write(CLOCK_IDLE(), tms, 0);
- end_state = cur_state;
+ tap_set_end_state(tap_get_state());
}
-void bitbang_runtest(int num_cycles)
+static void bitbang_runtest(int num_cycles)
{
int i;
- enum tap_state saved_end_state = end_state;
+ tap_state_t saved_end_state = tap_get_end_state();
/* only do a state_move when we're not already in IDLE */
- if (cur_state != TAP_IDLE)
+ if (tap_get_state() != TAP_IDLE)
{
bitbang_end_state(TAP_IDLE);
bitbang_state_move();
/* finish in end_state */
bitbang_end_state(saved_end_state);
- if (cur_state != end_state)
+ if (tap_get_state() != tap_get_end_state())
bitbang_state_move();
}
-void bitbang_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size)
+
+static void bitbang_stableclocks(int num_cycles)
{
- enum tap_state saved_end_state = end_state;
+ int tms = (tap_get_state() == TAP_RESET ? 1 : 0);
+ int i;
+
+ /* send num_cycles clocks onto the cable */
+ for (i = 0; i < num_cycles; i++)
+ {
+ bitbang_interface->write(1, tms, 0);
+ bitbang_interface->write(0, tms, 0);
+ }
+}
+
+
+
+static void bitbang_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size)
+{
+ tap_state_t saved_end_state = tap_get_end_state();
int bit_cnt;
- if (!((!ir_scan && (cur_state == TAP_DRSHIFT)) || (ir_scan && (cur_state == TAP_IRSHIFT))))
+ if (!((!ir_scan && (tap_get_state() == TAP_DRSHIFT)) || (ir_scan && (tap_get_state() == TAP_IRSHIFT))))
{
if (ir_scan)
bitbang_end_state(TAP_IRSHIFT);
bitbang_interface->write(CLOCK_IDLE(), 0, 0);
if (ir_scan)
- cur_state = TAP_IRPAUSE;
+ tap_set_state(TAP_IRPAUSE);
else
- cur_state = TAP_DRPAUSE;
+ tap_set_state(TAP_DRPAUSE);
- if (cur_state != end_state)
+ if (tap_get_state() != tap_get_end_state())
bitbang_state_move();
}
{
case JTAG_END_STATE:
#ifdef _DEBUG_JTAG_IO_
- LOG_DEBUG("end_state: %i", cmd->cmd.end_state->end_state);
+ LOG_DEBUG("end_state: %s", tap_state_name(cmd->cmd.end_state->end_state) );
#endif
- if (cmd->cmd.end_state->end_state != -1)
+ if (cmd->cmd.end_state->end_state != TAP_INVALID)
bitbang_end_state(cmd->cmd.end_state->end_state);
break;
case JTAG_RESET:
#endif
if ((cmd->cmd.reset->trst == 1) || (cmd->cmd.reset->srst && (jtag_reset_config & RESET_SRST_PULLS_TRST)))
{
- cur_state = TAP_RESET;
+ tap_set_state(TAP_RESET);
}
bitbang_interface->reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
break;
case JTAG_RUNTEST:
#ifdef _DEBUG_JTAG_IO_
- LOG_DEBUG("runtest %i cycles, end in %i", cmd->cmd.runtest->num_cycles, cmd->cmd.runtest->end_state);
+ LOG_DEBUG("runtest %i cycles, end in %s", cmd->cmd.runtest->num_cycles, tap_state_name(cmd->cmd.runtest->end_state) );
#endif
- if (cmd->cmd.runtest->end_state != -1)
+ if (cmd->cmd.runtest->end_state != TAP_INVALID)
bitbang_end_state(cmd->cmd.runtest->end_state);
bitbang_runtest(cmd->cmd.runtest->num_cycles);
break;
+
+ case JTAG_STABLECLOCKS:
+ /* this is only allowed while in a stable state. A check for a stable
+ * state was done in jtag_add_clocks()
+ */
+ bitbang_stableclocks(cmd->cmd.stableclocks->num_cycles);
+ break;
+
case JTAG_STATEMOVE:
#ifdef _DEBUG_JTAG_IO_
- LOG_DEBUG("statemove end in %i", cmd->cmd.statemove->end_state);
+ LOG_DEBUG("statemove end in %s", tap_state_name(cmd->cmd.statemove->end_state));
#endif
- if (cmd->cmd.statemove->end_state != -1)
+ if (cmd->cmd.statemove->end_state != TAP_INVALID)
bitbang_end_state(cmd->cmd.statemove->end_state);
bitbang_state_move();
break;
case JTAG_PATHMOVE:
#ifdef _DEBUG_JTAG_IO_
- LOG_DEBUG("pathmove: %i states, end in %i", cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
+ LOG_DEBUG("pathmove: %i states, end in %s", cmd->cmd.pathmove->num_states,
+ tap_state_name(cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]));
#endif
bitbang_path_move(cmd->cmd.pathmove);
break;
case JTAG_SCAN:
#ifdef _DEBUG_JTAG_IO_
- LOG_DEBUG("%s scan end in %i", (cmd->cmd.scan->ir_scan) ? "IR" : "DR", cmd->cmd.scan->end_state);
+ LOG_DEBUG("%s scan end in %s", (cmd->cmd.scan->ir_scan) ? "IR" : "DR", tap_state_name(cmd->cmd.scan->end_state) );
#endif
- if (cmd->cmd.scan->end_state != -1)
+ if (cmd->cmd.scan->end_state != TAP_INVALID)
bitbang_end_state(cmd->cmd.scan->end_state);
scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
type = jtag_scan_type(cmd->cmd.scan);
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