This is an automated email from Gerrit.
Andreas Fritiofson (andreas.fritiof...@gmail.com) just uploaded a new patch set
to Gerrit, which you can find at http://openocd.zylin.com/1999
-- gerrit
commit 5297c7be9c04cf8bdf128ddeacb5fa5b330b2344
Author: Andreas Fritiofson <andreas.fritiof...@gmail.com>
Date: Thu Feb 27 22:23:58 2014 +0100
ftdi: Optimize GPIO toggling
Only send the new I/O state for the bytes that changed.
Change-Id: I930edc9518e6019331e68e4756acc5e92dda25a4
Signed-off-by: Andreas Fritiofson <andreas.fritiof...@gmail.com>
diff --git a/src/jtag/drivers/ftdi.c b/src/jtag/drivers/ftdi.c
index 5617599..b13d6f8 100644
--- a/src/jtag/drivers/ftdi.c
+++ b/src/jtag/drivers/ftdi.c
@@ -182,14 +182,19 @@ static int ftdi_set_signal(const struct signal *s, char
value)
return ERROR_FAIL;
}
+ uint16_t old_output = output;
+ uint16_t old_direction = direction;
+
output = data ? output | s->data_mask : output & ~s->data_mask;
if (s->oe_mask == s->data_mask)
direction = oe ? direction | s->oe_mask : direction &
~s->oe_mask;
else
output = oe ? output | s->oe_mask : output & ~s->oe_mask;
- mpsse_set_data_bits_low_byte(mpsse_ctx, output & 0xff, direction &
0xff);
- mpsse_set_data_bits_high_byte(mpsse_ctx, output >> 8, direction >> 8);
+ if ((output & 0xff) != (old_output & 0xff) || (direction & 0xff) !=
(old_direction & 0xff))
+ mpsse_set_data_bits_low_byte(mpsse_ctx, output & 0xff,
direction & 0xff);
+ if ((output >> 8 != old_output >> 8) || (direction >> 8 !=
old_direction >> 8))
+ mpsse_set_data_bits_high_byte(mpsse_ctx, output >> 8, direction
>> 8);
return ERROR_OK;
}
--
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