64f1f7b1c1
Previously for every bit scanned OpenOCD would write the bit, wait for that bit to be scanned, and then read the result. This involves at least 2 context switches. Most of the time the next bit scanned does not depend on the last bit we read, so with a buffer we now write a bunch of bits to be scanned all at once, and then we wait for them all to be scanned and have a result. This reduces the time for one testcase where OpenOCD connects to a simulator from 12.30s to 5.35s! Running all our tests went from 13m13s to 3m55s. Change-Id: Ie9fcea043ac1d7877a521125334ed47d4b3e1615 Signed-off-by: Tim Newsome <tim@sifive.com> Reviewed-on: http://openocd.zylin.com/4312 Tested-by: jenkins Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
71 lines
2.8 KiB
C
71 lines
2.8 KiB
C
/***************************************************************************
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* Copyright (C) 2005 by Dominic Rath *
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* Dominic.Rath@gmx.de *
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* *
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* Copyright (C) 2007,2008 Øyvind Harboe *
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* oyvind.harboe@zylin.com *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program. If not, see <http://www.gnu.org/licenses/>. *
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***************************************************************************/
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#ifndef OPENOCD_JTAG_DRIVERS_BITBANG_H
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#define OPENOCD_JTAG_DRIVERS_BITBANG_H
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#include <jtag/swd.h>
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typedef enum {
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BB_LOW,
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BB_HIGH,
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BB_ERROR
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} bb_value_t;
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/** Low level callbacks (for bitbang).
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*
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* Either read(), or sample() and read_sample() must be implemented.
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*
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* The sample functions allow an interface to batch a number of writes and
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* sample requests together. Not waiting for a value to come back can greatly
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* increase throughput. */
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struct bitbang_interface {
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/** Sample TDO. */
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bb_value_t (*read)(void);
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/** The number of TDO samples that can be buffered up before the caller has
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* to call read_sample. */
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size_t buf_size;
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/** Sample TDO and put the result in a buffer. */
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int (*sample)(void);
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/** Return the next unread value from the buffer. */
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bb_value_t (*read_sample)(void);
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/** Set TCK, TMS, and TDI to the given values. */
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int (*write)(int tck, int tms, int tdi);
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int (*reset)(int trst, int srst);
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int (*blink)(int on);
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int (*swdio_read)(void);
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void (*swdio_drive)(bool on);
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};
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const struct swd_driver bitbang_swd;
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extern bool swd_mode;
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int bitbang_execute_queue(void);
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extern struct bitbang_interface *bitbang_interface;
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void bitbang_switch_to_swd(void);
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int bitbang_swd_switch_seq(enum swd_special_seq seq);
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#endif /* OPENOCD_JTAG_DRIVERS_BITBANG_H */
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