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/***************************************************************************
* Copyright (C) 2005 by Dominic Rath *
* Dominic.Rath@gmx.de *
* *
* Copyright (C) 2007,2008 Øyvind Harboe *
* oyvind.harboe@zylin.com *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
***************************************************************************/
#ifndef OPENOCD_JTAG_DRIVERS_BITBANG_H
#define OPENOCD_JTAG_DRIVERS_BITBANG_H
#include <jtag/swd.h>
typedef enum {
BB_LOW,
BB_HIGH,
BB_ERROR
} bb_value_t;
/** Low level callbacks (for bitbang).
*
* Either read(), or sample() and read_sample() must be implemented.
*
* The sample functions allow an interface to batch a number of writes and
* sample requests together. Not waiting for a value to come back can greatly
* increase throughput. */
struct bitbang_interface {
/** Sample TDO. */
bb_value_t (*read)(void);
/** The number of TDO samples that can be buffered up before the caller has
* to call read_sample. */
size_t buf_size;
/** Sample TDO and put the result in a buffer. */
int (*sample)(void);
/** Return the next unread value from the buffer. */
bb_value_t (*read_sample)(void);
/** Set TCK, TMS, and TDI to the given values. */
int (*write)(int tck, int tms, int tdi);
int (*reset)(int trst, int srst);
int (*blink)(int on);
int (*swdio_read)(void);
void (*swdio_drive)(bool on);
};
const struct swd_driver bitbang_swd;
extern bool swd_mode;
int bitbang_execute_queue(void);
extern struct bitbang_interface *bitbang_interface;
void bitbang_switch_to_swd(void);
int bitbang_swd_switch_seq(enum swd_special_seq seq);
#endif /* OPENOCD_JTAG_DRIVERS_BITBANG_H */
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