66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
|
|
/***************************************************************************
|
|
* Copyright (C) 2005 by Dominic Rath *
|
|
* Dominic.Rath@gmx.de *
|
|
* *
|
|
* Copyright (C) 2007,2008 Øyvind Harboe *
|
|
* oyvind.harboe@zylin.com *
|
|
***************************************************************************/
|
|
|
|
#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 and return the value. */
|
|
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);
|
|
|
|
/** Blink led (optional). */
|
|
int (*blink)(int on);
|
|
|
|
/** Sample SWDIO and return the value. */
|
|
int (*swdio_read)(void);
|
|
|
|
/** Set direction of SWDIO. */
|
|
void (*swdio_drive)(bool on);
|
|
|
|
/** Set SWCLK and SWDIO to the given value. */
|
|
int (*swd_write)(int swclk, int swdio);
|
|
};
|
|
|
|
extern const struct swd_driver bitbang_swd;
|
|
|
|
int bitbang_execute_queue(void);
|
|
|
|
extern struct bitbang_interface *bitbang_interface;
|
|
|
|
#endif /* OPENOCD_JTAG_DRIVERS_BITBANG_H */
|