/**
* see jtag_add_ir_scan()
*
*/
int interface_jtag_add_ir_scan(struct jtag_tap* active, const struct scan_field *in_fields, tap_state_t state)
{
size_t num_taps = jtag_tap_count_enabled();
struct jtag_command * cmd = cmd_queue_alloc(sizeof(struct jtag_command));
struct scan_command * scan = cmd_queue_alloc(sizeof(struct scan_command));
struct scan_field * out_fields = cmd_queue_alloc(num_taps * sizeof(struct scan_field));
jtag_queue_command(cmd);
cmd->type = JTAG_SCAN;
cmd->cmd.scan = scan;
scan->ir_scan = true;
scan->num_fields = num_taps; /* one field per device */
scan->fields = out_fields;
scan->end_state = state;
struct scan_field * field = out_fields; /* keep track where we insert data */
/* loop over all enabled TAPs */
for (struct jtag_tap * tap = jtag_tap_next_enabled(NULL); tap != NULL; tap = jtag_tap_next_enabled(tap))
{
/* search the input field list for fields for the current TAP */
if (tap == active)
{
/* if TAP is listed in input fields, copy the value */
tap->bypass = 0;
cmd_queue_scan_field_clone(field, in_fields);
} else
{
/* if a TAP isn't listed in input fields, set it to BYPASS */
tap->bypass = 1;
field->num_bits = tap->ir_length;
field->out_value = buf_set_ones(cmd_queue_alloc(DIV_ROUND_UP(tap->ir_length, 8)), tap->ir_length);
field->in_value = NULL; /* do not collect input for tap's in bypass */
}
/* update device information */
buf_cpy(field->out_value, tap->cur_instr, tap->ir_length);
field++;
}
assert(field == out_fields + num_taps); /* paranoia: jtag_tap_count_enabled() and jtag_tap_next_enabled() not in sync */
return ERROR_OK;
}
/**
* see jtag_add_plain_dr_scan()
*
*/
int interface_jtag_add_plain_dr_scan(int in_num_fields, const struct scan_field *in_fields, tap_state_t state)
{
struct jtag_command * cmd = cmd_queue_alloc(sizeof(struct jtag_command));
struct scan_command * scan = cmd_queue_alloc(sizeof(struct scan_command));
struct scan_field * out_fields = cmd_queue_alloc(in_num_fields * sizeof(struct scan_field));
jtag_queue_command(cmd);
cmd->type = JTAG_SCAN;
cmd->cmd.scan = scan;
scan->ir_scan = false;
scan->num_fields = in_num_fields;
scan->fields = out_fields;
scan->end_state = state;
for (int i = 0; i < in_num_fields; i++)
cmd_queue_scan_field_clone(out_fields + i, in_fields + i);
return ERROR_OK;
}
/**
* see jtag_add_dr_scan()
*
*/
int interface_jtag_add_dr_scan(struct jtag_tap* active, int in_num_fields, const struct scan_field *in_fields, tap_state_t state)
{
/* count devices in bypass */
size_t bypass_devices = 0;
for (struct jtag_tap * tap = jtag_tap_next_enabled(NULL); tap != NULL; tap = jtag_tap_next_enabled(tap))
{
if (tap->bypass)
bypass_devices++;
}
struct jtag_command * cmd = cmd_queue_alloc(sizeof(struct jtag_command));
struct scan_command * scan = cmd_queue_alloc(sizeof(struct scan_command));
struct scan_field * out_fields = cmd_queue_alloc((in_num_fields + bypass_devices) * sizeof(struct scan_field));
jtag_queue_command(cmd);
cmd->type = JTAG_SCAN;
cmd->cmd.scan = scan;
scan->ir_scan = false;
scan->num_fields = in_num_fields + bypass_devices;
scan->fields = out_fields;
scan->end_state = state;
struct scan_field * field = out_fields; /* keep track where we insert data */
/* loop over all enabled TAPs */
for (struct jtag_tap * tap = jtag_tap_next_enabled(NULL); tap != NULL; tap = jtag_tap_next_enabled(tap))
{
/* if TAP is not bypassed insert matching input fields */
if (!tap->bypass)
{
assert(active == tap);
#ifndef NDEBUG
/* remember initial position for assert() */
struct scan_field *start_field = field;
#endif /* NDEBUG */
for (int j = 0; j < in_num_fields; j++)
{
cmd_queue_scan_field_clone(field, in_fields + j);
field++;
}
assert(field > start_field); /* must have at least one input field per not bypassed TAP */
}
/* if a TAP is bypassed, generated a dummy bit*/
else
{
field->num_bits = 1;
field->out_value = NULL;
field->in_value = NULL;
field++;
}
}
assert(field == out_fields + scan->num_fields); /* no superfluous input fields permitted */
return ERROR_OK;
}