1 /***************************************************************************
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2 * Copyright (C) 2007 by Pavel Chromy *
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5 * This program is free software; you can redistribute it and/or modify *
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6 * it under the terms of the GNU General Public License as published by *
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7 * the Free Software Foundation; either version 2 of the License, or *
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8 * (at your option) any later version. *
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10 * This program is distributed in the hope that it will be useful, *
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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13 * GNU General Public License for more details. *
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15 * You should have received a copy of the GNU General Public License *
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16 * along with this program; if not, write to the *
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17 * Free Software Foundation, Inc., *
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18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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19 ***************************************************************************/
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20 #ifdef HAVE_CONFIG_H
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26 /* project specific includes */
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30 #include "configuration.h"
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32 /* system includes */
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37 #include <sys/time.h>
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41 bitq_interface_t *bitq_interface; /* low level bit queue interface */
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43 bitq_state_t bitq_in_state; /* state of input queue */
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45 u8 *bitq_in_buffer; /* buffer dynamically reallocated as needed */
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46 unsigned long bitq_in_bufsize=32; /* min. buffer size */
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50 * input queue processing does not use jtag_read_buffer() to avoid unnecessary overhead
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51 * also the buffer for incomming data is reallocated only if necessary
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52 * no parameters, makes use of stored state information
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54 void bitq_in_proc(void)
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56 /* static information preserved between calls to increase performance */
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57 static u8 *in_buff; /* pointer to buffer for scanned data */
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58 static int in_idx; /* index of byte being scanned */
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59 static u8 in_mask; /* mask of next bit to be scanned */
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61 scan_field_t *field;
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64 /* loop through the queue */
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65 while (bitq_in_state.cmd) {
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66 /* only JTAG_SCAN command may return data */
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67 if (bitq_in_state.cmd->type==JTAG_SCAN) {
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68 /* loop through the fields */
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69 while (bitq_in_state.field_idx<bitq_in_state.cmd->cmd.scan->num_fields) {
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71 field=&bitq_in_state.cmd->cmd.scan->fields[bitq_in_state.field_idx];
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72 if ( field->in_value || field->in_handler) {
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74 if (bitq_in_state.bit_pos==0) {
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75 /* initialize field scanning */
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78 if (field->in_value) in_buff=field->in_value;
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80 /* buffer reallocation needed? */
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81 if (field->num_bits>bitq_in_bufsize*8) {
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82 /* buffer previously allocated? */
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83 if (bitq_in_buffer!=NULL) {
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85 free(bitq_in_buffer);
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86 bitq_in_buffer=NULL;
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88 /* double the buffer size until it fits */
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89 while (field->num_bits>bitq_in_bufsize*8) bitq_in_bufsize*=2;
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91 /* if necessary, allocate buffer and check for malloc error */
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92 if (bitq_in_buffer==NULL && (bitq_in_buffer=malloc(bitq_in_bufsize))==NULL) {
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93 ERROR("malloc error");
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96 in_buff=(void *)bitq_in_buffer;
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100 /* field scanning */
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101 while (bitq_in_state.bit_pos<field->num_bits) {
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102 if ((tdo=bitq_interface->in())<0) {
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103 #ifdef _DEBUG_JTAG_IO_
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104 DEBUG("bitq in EOF");
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108 if (in_mask==0x01) in_buff[in_idx]=0;
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109 if (tdo) in_buff[in_idx]|=in_mask;
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110 if (in_mask==0x80) {
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115 bitq_in_state.bit_pos++;
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119 if (field->in_handler && bitq_in_state.status==ERROR_OK) {
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120 bitq_in_state.status=(*field->in_handler)(in_buff, field->in_handler_priv, field);
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125 bitq_in_state.field_idx++; /* advance to next field */
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126 bitq_in_state.bit_pos=0; /* start next field from the first bit */
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130 bitq_in_state.cmd=bitq_in_state.cmd->next; /* advance to next command */
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131 bitq_in_state.field_idx=0; /* preselect first field */
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137 void bitq_io(int tms, int tdi, int tdo_req)
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139 bitq_interface->out(tms, tdi, tdo_req);
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140 /* check and process the input queue */
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141 if (bitq_interface->in_rdy()) bitq_in_proc();
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145 void bitq_end_state(enum tap_state state)
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147 if (state==-1) return;
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148 if (tap_move_map[state]==-1) {
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149 ERROR("BUG: %i is not a valid end state", state);
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156 void bitq_state_move(enum tap_state new_state)
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161 if (tap_move_map[cur_state]==-1 || tap_move_map[new_state]==-1) {
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162 ERROR("TAP move from or to unstable state");
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166 tms_scan=TAP_MOVE(cur_state, new_state);
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168 for (i=0; i<7; i++) {
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169 bitq_io(tms_scan&1, 0, 0);
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173 cur_state = new_state;
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177 void bitq_path_move(pathmove_command_t *cmd)
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181 for (i=0; i<=cmd->num_states; i++) {
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182 if (tap_transitions[cur_state].low == cmd->path[i]) bitq_io(0, 0, 0);
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183 else if (tap_transitions[cur_state].high == cmd->path[i]) bitq_io(1, 0, 0);
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185 ERROR("BUG: %s -> %s isn't a valid TAP transition", tap_state_strings[cur_state], tap_state_strings[cmd->path[i]]);
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189 cur_state = cmd->path[i];
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192 end_state = cur_state;
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196 void bitq_runtest(int num_cycles)
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200 /* only do a state_move when we're not already in RTI */
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201 if (cur_state != TAP_RTI) bitq_state_move(TAP_RTI);
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203 /* execute num_cycles */
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204 for (i = 0; i < num_cycles; i++)
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207 /* finish in end_state */
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208 if (cur_state != end_state) bitq_state_move(end_state);
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212 void bitq_scan_field(scan_field_t *field, int pause)
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220 if ( field->in_value || field->in_handler) tdo_req=1;
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223 if (field->out_value==NULL) {
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224 /* just send zeros and request data from TDO */
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225 for (bit_cnt=field->num_bits; bit_cnt>1; bit_cnt--)
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226 bitq_io(0, 0, tdo_req);
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227 bitq_io(pause, 0, tdo_req);
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230 /* send data, and optionally request TDO */
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232 out_ptr=field->out_value;
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233 for (bit_cnt=field->num_bits; bit_cnt>1; bit_cnt--) {
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234 bitq_io(0, ((*out_ptr)&out_mask)!=0, tdo_req);
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235 if (out_mask==0x80) {
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241 bitq_io(pause, ((*out_ptr)&out_mask)!=0, tdo_req);
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246 if (cur_state==TAP_SI) cur_state=TAP_PI;
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247 else if (cur_state==TAP_SD) cur_state=TAP_PD;
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252 void bitq_scan(scan_command_t *cmd)
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256 if (cmd->ir_scan) bitq_state_move(TAP_SI);
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257 else bitq_state_move(TAP_SD);
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259 for (i=0; i < cmd->num_fields-1; i++)
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260 bitq_scan_field(&cmd->fields[i], 0);
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261 bitq_scan_field(&cmd->fields[i], 1);
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265 int bitq_execute_queue(void)
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267 jtag_command_t *cmd = jtag_command_queue; /* currently processed command */
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269 bitq_in_state.cmd = jtag_command_queue;
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270 bitq_in_state.field_idx = 0;
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271 bitq_in_state.bit_pos = 0;
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272 bitq_in_state.status = ERROR_OK;
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276 switch (cmd->type) {
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278 case JTAG_END_STATE:
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279 #ifdef _DEBUG_JTAG_IO_
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280 DEBUG("end_state: %i", cmd->cmd.end_state->end_state);
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282 bitq_end_state(cmd->cmd.end_state->end_state);
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286 #ifdef _DEBUG_JTAG_IO_
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287 DEBUG("reset trst: %i srst %i", cmd->cmd.reset->trst, cmd->cmd.reset->srst);
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289 bitq_interface->reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
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290 if (bitq_interface->in_rdy()) bitq_in_proc();
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294 #ifdef _DEBUG_JTAG_IO_
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295 DEBUG("runtest %i cycles, end in %i", cmd->cmd.runtest->num_cycles, cmd->cmd.runtest->end_state);
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297 bitq_end_state(cmd->cmd.runtest->end_state);
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298 bitq_runtest(cmd->cmd.runtest->num_cycles);
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301 case JTAG_STATEMOVE:
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302 #ifdef _DEBUG_JTAG_IO_
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303 DEBUG("statemove end in %i", cmd->cmd.statemove->end_state);
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305 bitq_end_state(cmd->cmd.statemove->end_state);
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306 bitq_state_move(end_state); /* uncoditional TAP move */
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309 case JTAG_PATHMOVE:
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310 #ifdef _DEBUG_JTAG_IO_
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311 DEBUG("pathmove: %i states, end in %i", cmd->cmd.pathmove->num_states, cmd->cmd.pathmove->path[cmd->cmd.pathmove->num_states - 1]);
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313 bitq_path_move(cmd->cmd.pathmove);
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317 #ifdef _DEBUG_JTAG_IO_
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318 DEBUG("scan end in %i", cmd->cmd.scan->end_state);
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319 if (cmd->cmd.scan->ir_scan) DEBUG("scan ir");
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320 else DEBUG("scan dr");
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322 bitq_end_state(cmd->cmd.scan->end_state);
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323 bitq_scan(cmd->cmd.scan);
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324 if (cur_state != end_state) bitq_state_move(end_state);
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328 #ifdef _DEBUG_JTAG_IO_
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329 DEBUG("sleep %i", cmd->cmd.sleep->us);
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331 bitq_interface->sleep(cmd->cmd.sleep->us);
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332 if (bitq_interface->in_rdy()) bitq_in_proc();
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336 ERROR("BUG: unknown JTAG command type encountered");
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343 bitq_interface->flush();
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346 if (bitq_in_state.cmd) {
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347 ERROR("missing data from bitq interface");
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348 return ERROR_JTAG_QUEUE_FAILED;
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350 if (bitq_interface->in()>=0) {
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351 ERROR("extra data from bitq interface");
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352 return ERROR_JTAG_QUEUE_FAILED;
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355 return bitq_in_state.status;
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359 void bitq_cleanup(void)
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361 if (bitq_in_buffer!=NULL)
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363 free(bitq_in_buffer);
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364 bitq_in_buffer=NULL;
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