* 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, write to the *
- * Free Software Foundation, Inc., *
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
+ * along with this program. If not, see <http://www.gnu.org/licenses/>. *
***************************************************************************/
-#ifndef BITBANG_H
-#define BITBANG_H
+#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 {
- /* low level callbacks (for bitbang)
- */
- int (*read)(void);
- void (*write)(int tck, int tms, int tdi);
- void (*reset)(int trst, int srst);
- void (*blink)(int on);
+ /** 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 /* BITBANG_H */
+#endif /* OPENOCD_JTAG_DRIVERS_BITBANG_H */