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zy1000: jtag_add_dr_scan() performance improvement

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Reduce overhead in jtag_add_dr_scan() a bit.

Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
This commit is contained in:
Øyvind Harboe 2010-02-08 15:40:53 +01:00
parent c21c740a89
commit 90efc404f3
1 changed files with 15 additions and 8 deletions
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23
src/jtag/zy1000/zy1000.c
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@ -650,22 +650,29 @@ int interface_jtag_add_dr_scan(int num_fields, const struct scan_field *fields,
for (j = 0; j < num_fields; j++)
{
/* Find a range of fields to write to this tap */
if (tap == fields[j].tap)
{
found = 1;
int i;
for (i = j + 1; i < num_fields; i++)
{
if (tap != fields[j].tap)
{
break;
}
}
scanFields(1, fields+j, TAP_DRSHIFT, pause);
scanFields(i - j, fields + j, TAP_DRSHIFT, pause);
j = i;
}
}
if (!found)
{
struct scan_field tmp;
/* program the scan field to 1 bit length, and ignore it's value */
tmp.num_bits = 1;
tmp.out_value = NULL;
tmp.in_value = NULL;
scanFields(1, &tmp, TAP_DRSHIFT, pause);
/* Shift out a 0 for disabled tap's */
shiftValueInner(TAP_DRSHIFT, pause?TAP_DRPAUSE:TAP_DRSHIFT, 1, 0);
}
else
{