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 */
47 void bitbang_end_state(enum tap_state state)
49 if (tap_move_map[state] != -1)
53 ERROR("BUG: %i is not a valid end state", state);
58 void bitbang_state_move(void) {
61 u8 tms_scan = TAP_MOVE(cur_state, end_state);
63 for (i = 0; i < 7; i++)
65 tms = (tms_scan >> i) & 1;
66 bitbang_interface->write(0, tms, 0);
67 bitbang_interface->write(1, tms, 0);
69 bitbang_interface->write(0, tms, 0);
71 cur_state = end_state;
74 void bitbang_path_move(pathmove_command_t *cmd)
76 int num_states = cmd->num_states;
83 if (tap_transitions[cur_state].low == cmd->path[state_count])
87 else if (tap_transitions[cur_state].high == cmd->path[state_count])
93 ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_strings[cur_state], tap_state_strings[cmd->path[state_count]]);
97 bitbang_interface->write(0, tms, 0);
98 bitbang_interface->write(1, tms, 0);
100 cur_state = cmd->path[state_count];
105 bitbang_interface->write(0, tms, 0);
107 end_state = cur_state;
110 void bitbang_runtest(int num_cycles)
114 enum tap_state saved_end_state = end_state;
116 /* only do a state_move when we're not already in RTI */
117 if (cur_state != TAP_RTI)
119 bitbang_end_state(TAP_RTI);
120 bitbang_state_move();
123 /* execute num_cycles */
124 bitbang_interface->write(0, 0, 0);
125 for (i = 0; i < num_cycles; i++)
127 bitbang_interface->write(1, 0, 0);
128 bitbang_interface->write(0, 0, 0);
131 /* finish in end_state */
132 bitbang_end_state(saved_end_state);
133 if (cur_state != end_state)
134 bitbang_state_move();
137 void bitbang_scan(int ir_scan, enum scan_type type, u8 *buffer, int scan_size)
139 enum tap_state saved_end_state = end_state;
142 if (!((!ir_scan && (cur_state == TAP_SD)) || (ir_scan && (cur_state == TAP_SI))))
145 bitbang_end_state(TAP_SI);
147 bitbang_end_state(TAP_SD);
149 bitbang_state_move();
150 bitbang_end_state(saved_end_state);
153 for (bit_cnt = 0; bit_cnt < scan_size; bit_cnt++)
155 /* if we're just reading the scan, but don't care about the output
156 * default to outputting 'low', this also makes valgrind traces more readable,
157 * as it removes the dependency on an uninitialised value
159 if ((type != SCAN_IN) && ((buffer[bit_cnt/8] >> (bit_cnt % 8)) & 0x1))
161 bitbang_interface->write(0, (bit_cnt==scan_size-1) ? 1 : 0, 1);
162 bitbang_interface->write(1, (bit_cnt==scan_size-1) ? 1 : 0, 1);
164 bitbang_interface->write(0, (bit_cnt==scan_size-1) ? 1 : 0, 0);
165 bitbang_interface->write(1, (bit_cnt==scan_size-1) ? 1 : 0, 0);
168 if (type != SCAN_OUT)
170 if (bitbang_interface->read())
171 buffer[(bit_cnt)/8] |= 1 << ((bit_cnt) % 8);
173 buffer[(bit_cnt)/8] &= ~(1 << ((bit_cnt) % 8));
178 bitbang_interface->write(0, 0, 0);
179 bitbang_interface->write(1, 0, 0);
180 bitbang_interface->write(0, 0, 0);
187 if (cur_state != end_state)
188 bitbang_state_move();
191 int bitbang_execute_queue(void)
193 jtag_command_t *cmd = jtag_command_queue; /* currently processed command */
199 if (!bitbang_interface)
201 ERROR("BUG: Bitbang interface called, but not yet initialized");
205 /* return ERROR_OK, unless a jtag_read_buffer returns a failed check
206 * that wasn't handled by a caller-provided error handler
210 if(bitbang_interface->blink)
211 bitbang_interface->blink(1);
218 #ifdef _DEBUG_JTAG_IO_
219 DEBUG("end_state: %i", cmd->cmd.end_state->end_state);
221 if (cmd->cmd.end_state->end_state != -1)
222 bitbang_end_state(cmd->cmd.end_state->end_state);
225 #ifdef _DEBUG_JTAG_IO_
226 DEBUG("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
228 if (cmd->cmd.reset->trst == 1)
232 bitbang_interface->reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
235 #ifdef _DEBUG_JTAG_IO_
236 DEBUG("runtest %i cycles, end in %i", cmd->cmd.runtest->num_cycles, cmd->cmd.runtest->end_state);
238 if (cmd->cmd.runtest->end_state != -1)
239 bitbang_end_state(cmd->cmd.runtest->end_state);
240 bitbang_runtest(cmd->cmd.runtest->num_cycles);
243 #ifdef _DEBUG_JTAG_IO_
244 DEBUG("statemove end in %i", cmd->cmd.statemove->end_state);
246 if (cmd->cmd.statemove->end_state != -1)
247 bitbang_end_state(cmd->cmd.statemove->end_state);
248 bitbang_state_move();
251 #ifdef _DEBUG_JTAG_IO_
252 DEBUG("pathmove: %i states, end in %i", cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
254 bitbang_path_move(cmd->cmd.pathmove);
257 #ifdef _DEBUG_JTAG_IO_
258 DEBUG("%s scan end in %i", (cmd->cmd.scan->ir_scan) ? "IR" : "DR", cmd->cmd.scan->end_state);
260 if (cmd->cmd.scan->end_state != -1)
261 bitbang_end_state(cmd->cmd.scan->end_state);
262 scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
263 type = jtag_scan_type(cmd->cmd.scan);
264 bitbang_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size);
265 if (jtag_read_buffer(buffer, cmd->cmd.scan) != ERROR_OK)
266 retval = ERROR_JTAG_QUEUE_FAILED;
271 #ifdef _DEBUG_JTAG_IO_
272 DEBUG("sleep %i", cmd->cmd.sleep->us);
274 jtag_sleep(cmd->cmd.sleep->us);
277 ERROR("BUG: unknown JTAG command type encountered");
282 if(bitbang_interface->blink)
283 bitbang_interface->blink(0);