1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
26 /* project specific includes */
30 #include "configuration.h"
40 bitbang_interface_t
*bitbang_interface
;
42 int bitbang_execute_queue(void);
44 /* The bitbang driver leaves the TCK 0 when in idle */
46 void bitbang_end_state(enum tap_state state
)
48 if (tap_move_map
[state
] != -1)
52 LOG_ERROR("BUG: %i is not a valid end state", state
);
57 void bitbang_state_move(void) {
60 u8 tms_scan
= TAP_MOVE(cur_state
, end_state
);
62 for (i
= 0; i
< 7; i
++)
64 tms
= (tms_scan
>> i
) & 1;
65 bitbang_interface
->write(0, tms
, 0);
66 bitbang_interface
->write(1, tms
, 0);
68 bitbang_interface
->write(0, tms
, 0);
70 cur_state
= end_state
;
73 void bitbang_path_move(pathmove_command_t
*cmd
)
75 int num_states
= cmd
->num_states
;
82 if (tap_transitions
[cur_state
].low
== cmd
->path
[state_count
])
86 else if (tap_transitions
[cur_state
].high
== cmd
->path
[state_count
])
92 LOG_ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_strings
[cur_state
], tap_state_strings
[cmd
->path
[state_count
]]);
96 bitbang_interface
->write(0, tms
, 0);
97 bitbang_interface
->write(1, tms
, 0);
99 cur_state
= cmd
->path
[state_count
];
104 bitbang_interface
->write(0, tms
, 0);
106 end_state
= cur_state
;
109 void bitbang_runtest(int num_cycles
)
113 enum tap_state saved_end_state
= end_state
;
115 /* only do a state_move when we're not already in RTI */
116 if (cur_state
!= TAP_RTI
)
118 bitbang_end_state(TAP_RTI
);
119 bitbang_state_move();
122 /* execute num_cycles */
123 bitbang_interface
->write(0, 0, 0);
124 for (i
= 0; i
< num_cycles
; i
++)
126 bitbang_interface
->write(1, 0, 0);
127 bitbang_interface
->write(0, 0, 0);
130 /* finish in end_state */
131 bitbang_end_state(saved_end_state
);
132 if (cur_state
!= end_state
)
133 bitbang_state_move();
136 void bitbang_scan(int ir_scan
, enum scan_type type
, u8
*buffer
, int scan_size
)
138 enum tap_state saved_end_state
= end_state
;
141 if (!((!ir_scan
&& (cur_state
== TAP_SD
)) || (ir_scan
&& (cur_state
== TAP_SI
))))
144 bitbang_end_state(TAP_SI
);
146 bitbang_end_state(TAP_SD
);
148 bitbang_state_move();
149 bitbang_end_state(saved_end_state
);
152 for (bit_cnt
= 0; bit_cnt
< scan_size
; bit_cnt
++)
154 /* if we're just reading the scan, but don't care about the output
155 * default to outputting 'low', this also makes valgrind traces more readable,
156 * as it removes the dependency on an uninitialised value
158 if ((type
!= SCAN_IN
) && ((buffer
[bit_cnt
/8] >> (bit_cnt
% 8)) & 0x1))
160 bitbang_interface
->write(0, (bit_cnt
==scan_size
-1) ? 1 : 0, 1);
161 bitbang_interface
->write(1, (bit_cnt
==scan_size
-1) ? 1 : 0, 1);
163 bitbang_interface
->write(0, (bit_cnt
==scan_size
-1) ? 1 : 0, 0);
164 bitbang_interface
->write(1, (bit_cnt
==scan_size
-1) ? 1 : 0, 0);
167 if (type
!= SCAN_OUT
)
170 TDO should be sampled on the rising edge, and will change
173 Because there is no way to read the signal exactly at the rising edge,
174 read after the rising edge.
176 This is plain IEEE 1149 JTAG - nothing specific to the OpenOCD or its JTAG
179 if (bitbang_interface
->read())
180 buffer
[(bit_cnt
)/8] |= 1 << ((bit_cnt
) % 8);
182 buffer
[(bit_cnt
)/8] &= ~(1 << ((bit_cnt
) % 8));
186 /* TAP_SD & TAP_SI are illegal end states, so we always transition to the pause
187 * state which is a legal stable state from which statemove will work.
191 bitbang_interface
->write(0, 0, 0);
192 bitbang_interface
->write(1, 0, 0);
193 bitbang_interface
->write(0, 0, 0);
200 if (cur_state
!= end_state
)
201 bitbang_state_move();
204 int bitbang_execute_queue(void)
206 jtag_command_t
*cmd
= jtag_command_queue
; /* currently processed command */
212 if (!bitbang_interface
)
214 LOG_ERROR("BUG: Bitbang interface called, but not yet initialized");
218 /* return ERROR_OK, unless a jtag_read_buffer returns a failed check
219 * that wasn't handled by a caller-provided error handler
223 if(bitbang_interface
->blink
)
224 bitbang_interface
->blink(1);
231 #ifdef _DEBUG_JTAG_IO_
232 LOG_DEBUG("end_state: %i", cmd
->cmd
.end_state
->end_state
);
234 if (cmd
->cmd
.end_state
->end_state
!= -1)
235 bitbang_end_state(cmd
->cmd
.end_state
->end_state
);
238 #ifdef _DEBUG_JTAG_IO_
239 LOG_DEBUG("reset trst: %i srst %i", cmd
->cmd
.reset
->trst
, cmd
->cmd
.reset
->srst
);
241 if ((cmd
->cmd
.reset
->trst
== 1) || (cmd
->cmd
.reset
->srst
&& (jtag_reset_config
& RESET_SRST_PULLS_TRST
)))
245 bitbang_interface
->reset(cmd
->cmd
.reset
->trst
, cmd
->cmd
.reset
->srst
);
248 #ifdef _DEBUG_JTAG_IO_
249 LOG_DEBUG("runtest %i cycles, end in %i", cmd
->cmd
.runtest
->num_cycles
, cmd
->cmd
.runtest
->end_state
);
251 if (cmd
->cmd
.runtest
->end_state
!= -1)
252 bitbang_end_state(cmd
->cmd
.runtest
->end_state
);
253 bitbang_runtest(cmd
->cmd
.runtest
->num_cycles
);
256 #ifdef _DEBUG_JTAG_IO_
257 LOG_DEBUG("statemove end in %i", cmd
->cmd
.statemove
->end_state
);
259 if (cmd
->cmd
.statemove
->end_state
!= -1)
260 bitbang_end_state(cmd
->cmd
.statemove
->end_state
);
261 bitbang_state_move();
264 #ifdef _DEBUG_JTAG_IO_
265 LOG_DEBUG("pathmove: %i states, end in %i", cmd
->cmd
.pathmove
->num_states
, cmd
->cmd
.pathmove
->path
[cmd
->cmd
.pathmove
->num_states
- 1]);
267 bitbang_path_move(cmd
->cmd
.pathmove
);
270 #ifdef _DEBUG_JTAG_IO_
271 LOG_DEBUG("%s scan end in %i", (cmd
->cmd
.scan
->ir_scan
) ? "IR" : "DR", cmd
->cmd
.scan
->end_state
);
273 if (cmd
->cmd
.scan
->end_state
!= -1)
274 bitbang_end_state(cmd
->cmd
.scan
->end_state
);
275 scan_size
= jtag_build_buffer(cmd
->cmd
.scan
, &buffer
);
276 type
= jtag_scan_type(cmd
->cmd
.scan
);
277 bitbang_scan(cmd
->cmd
.scan
->ir_scan
, type
, buffer
, scan_size
);
278 if (jtag_read_buffer(buffer
, cmd
->cmd
.scan
) != ERROR_OK
)
279 retval
= ERROR_JTAG_QUEUE_FAILED
;
284 #ifdef _DEBUG_JTAG_IO_
285 LOG_DEBUG("sleep %i", cmd
->cmd
.sleep
->us
);
287 jtag_sleep(cmd
->cmd
.sleep
->us
);
290 LOG_ERROR("BUG: unknown JTAG command type encountered");
295 if(bitbang_interface
->blink
)
296 bitbang_interface
->blink(0);
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