src/modules/tools/zprobe/ZProbe.cpp

   1 /*
   2       This file is part of Smoothie (http://smoothieware.org/). The motion control part is heavily based on Grbl (https://github.com/simen/grbl).
   3       Smoothie is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
   4       Smoothie is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
   5       You should have received a copy of the GNU General Public License along with Smoothie. If not, see <http://www.gnu.org/licenses/>.
   6 */
   7
   8 #include "ZProbe.h"
   9
  10 #include "Kernel.h"
  11 #include "BaseSolution.h"
  12 #include "Config.h"
  13 #include "Robot.h"
  14 #include "StepperMotor.h"
  15 #include "StreamOutputPool.h"
  16 #include "Gcode.h"
  17 #include "Conveyor.h"
  18 #include "checksumm.h"
  19 #include "ConfigValue.h"
  20 #include "SlowTicker.h"
  21 #include "Planner.h"
  22 #include "SerialMessage.h"
  23 #include "PublicDataRequest.h"
  24 #include "EndstopsPublicAccess.h"
  25 #include "PublicData.h"
  26 #include "LevelingStrategy.h"
  27 #include "StepTicker.h"
  28 #include "utils.h"
  29
  30 // strategies we know about
  31 #include "DeltaCalibrationStrategy.h"
  32 #include "ThreePointStrategy.h"
  33 #include "DeltaGridStrategy.h"
  34 #include "CartGridStrategy.h"
  35
  36 #define enable_checksum          CHECKSUM("enable")
  37 #define probe_pin_checksum       CHECKSUM("probe_pin")
  38 #define debounce_ms_checksum     CHECKSUM("debounce_ms")
  39 #define slow_feedrate_checksum   CHECKSUM("slow_feedrate")
  40 #define fast_feedrate_checksum   CHECKSUM("fast_feedrate")
  41 #define return_feedrate_checksum CHECKSUM("return_feedrate")
  42 #define probe_height_checksum    CHECKSUM("probe_height")
  43 #define gamma_max_checksum       CHECKSUM("gamma_max")
  44 #define max_z_checksum           CHECKSUM("max_z")
  45 #define reverse_z_direction_checksum CHECKSUM("reverse_z")
  46 #define dwell_before_probing_checksum CHECKSUM("dwell_before_probing")
  47
  48 // from endstop section
  49 #define delta_homing_checksum    CHECKSUM("delta_homing")
  50 #define rdelta_homing_checksum    CHECKSUM("rdelta_homing")
  51
  52 #define X_AXIS 0
  53 #define Y_AXIS 1
  54 #define Z_AXIS 2
  55
  56 #define STEPPER THEROBOT->actuators
  57 #define STEPS_PER_MM(a) (STEPPER[a]->get_steps_per_mm())
  58 #define Z_STEPS_PER_MM STEPS_PER_MM(Z_AXIS)
  59
  60 void ZProbe::on_module_loaded()
  61 {
  62     // if the module is disabled -> do nothing
  63     if(!THEKERNEL->config->value( zprobe_checksum, enable_checksum )->by_default(false)->as_bool()) {
  64         // as this module is not needed free up the resource
  65         delete this;
  66         return;
  67     }
  68
  69     // load settings
  70     this->config_load();
  71     // register event-handlers
  72     register_for_event(ON_GCODE_RECEIVED);
  73
  74     // we read the probe in this timer
  75     probing= false;
  76     THEKERNEL->slow_ticker->attach(1000, this, &ZProbe::read_probe);
  77 }
  78
  79 void ZProbe::config_load()
  80 {
  81     this->pin.from_string( THEKERNEL->config->value(zprobe_checksum, probe_pin_checksum)->by_default("nc" )->as_string())->as_input();
  82     this->debounce_ms    = THEKERNEL->config->value(zprobe_checksum, debounce_ms_checksum)->by_default(0  )->as_number();
  83
  84     // get strategies to load
  85     vector<uint16_t> modules;
  86     THEKERNEL->config->get_module_list( &modules, leveling_strategy_checksum);
  87     for( auto cs : modules ){
  88         if( THEKERNEL->config->value(leveling_strategy_checksum, cs, enable_checksum )->as_bool() ){
  89             bool found= false;
  90             LevelingStrategy *ls= nullptr;
  91
  92             // check with each known strategy and load it if it matches
  93             switch(cs) {
  94                 case delta_calibration_strategy_checksum:
  95                     ls= new DeltaCalibrationStrategy(this);
  96                     found= true;
  97                     break;
  98
  99                 case three_point_leveling_strategy_checksum:
 100                     // NOTE this strategy is mutually exclusive with the delta calibration strategy
 101                     ls= new ThreePointStrategy(this);
 102                     found= true;
 103                     break;
 104
 105                 case delta_grid_leveling_strategy_checksum:
 106                     ls= new DeltaGridStrategy(this);
 107                     found= true;
 108                     break;
 109
 110                 case cart_grid_leveling_strategy_checksum:
 111                     ls= new CartGridStrategy(this);
 112                     found= true;
 113                     break;
 114             }
 115             if(found) {
 116                 if(ls->handleConfig()) {
 117                     this->strategies.push_back(ls);
 118                 }else{
 119                     delete ls;
 120                 }
 121             }
 122         }
 123     }
 124
 125     // need to know if we need to use delta kinematics for homing
 126     this->is_delta = THEKERNEL->config->value(delta_homing_checksum)->by_default(false)->as_bool();
 127     this->is_rdelta = THEKERNEL->config->value(rdelta_homing_checksum)->by_default(false)->as_bool();
 128
 129     // default for backwards compatibility add DeltaCalibrationStrategy if a delta
 130     // may be deprecated
 131     if(this->strategies.empty()) {
 132         if(this->is_delta) {
 133             this->strategies.push_back(new DeltaCalibrationStrategy(this));
 134             this->strategies.back()->handleConfig();
 135         }
 136     }
 137
 138     this->probe_height  = THEKERNEL->config->value(zprobe_checksum, probe_height_checksum)->by_default(5.0F)->as_number();
 139     this->slow_feedrate = THEKERNEL->config->value(zprobe_checksum, slow_feedrate_checksum)->by_default(5)->as_number(); // feedrate in mm/sec
 140     this->fast_feedrate = THEKERNEL->config->value(zprobe_checksum, fast_feedrate_checksum)->by_default(100)->as_number(); // feedrate in mm/sec
 141     this->return_feedrate = THEKERNEL->config->value(zprobe_checksum, return_feedrate_checksum)->by_default(0)->as_number(); // feedrate in mm/sec
 142     this->reverse_z     = THEKERNEL->config->value(zprobe_checksum, reverse_z_direction_checksum)->by_default(false)->as_bool(); // Z probe moves in reverse direction
 143     this->max_z         = THEKERNEL->config->value(zprobe_checksum, max_z_checksum)->by_default(NAN)->as_number(); // maximum zprobe distance
 144     if(isnan(this->max_z)){
 145         this->max_z = THEKERNEL->config->value(gamma_max_checksum)->by_default(200)->as_number(); // maximum zprobe distance
 146     }
 147     this->dwell_before_probing = THEKERNEL->config->value(zprobe_checksum, dwell_before_probing_checksum)->by_default(0)->as_number(); // dwell time in seconds before probing
 148
 149 }
 150
 151 uint32_t ZProbe::read_probe(uint32_t dummy)
 152 {
 153     if(!probing || probe_detected) return 0;
 154
 155     // we check all axis as it maybe a G38.2 X10 for instance, not just a probe in Z
 156     if(STEPPER[X_AXIS]->is_moving() || STEPPER[Y_AXIS]->is_moving() || STEPPER[Z_AXIS]->is_moving()) {
 157         // if it is moving then we check the probe, and debounce it
 158         if(this->pin.get()) {
 159             if(debounce < debounce_ms) {
 160                 debounce++;
 161             } else {
 162                 // we signal the motors to stop, which will preempt any moves on that axis
 163                 // we do all motors as it may be a delta
 164                 for(auto &a : THEROBOT->actuators) a->stop_moving();
 165                 probe_detected= true;
 166                 debounce= 0;
 167             }
 168
 169         } else {
 170             // The endstop was not hit yet
 171             debounce= 0;
 172         }
 173     }
 174
 175     return 0;
 176 }
 177
 178 // single probe in Z with custom feedrate
 179 // returns boolean value indicating if probe was triggered
 180 bool ZProbe::run_probe(float& mm, float feedrate, float max_dist, bool reverse)
 181 {
 182     if(dwell_before_probing > .0001F) safe_delay_ms(dwell_before_probing*1000);
 183
 184     if(this->pin.get()) {
 185         // probe already triggered so abort
 186         return false;
 187     }
 188
 189     float maxz= max_dist < 0 ? this->max_z*2 : max_dist;
 190
 191     probing= true;
 192     probe_detected= false;
 193     debounce= 0;
 194
 195     // save current actuator position so we can report how far we moved
 196     float z_start_pos= THEROBOT->actuators[Z_AXIS]->get_current_position();
 197
 198     // move Z down
 199     bool dir= (!reverse_z != reverse); // xor
 200     float delta[3]= {0,0,0};
 201     delta[Z_AXIS]= dir ? -maxz : maxz;
 202     THEROBOT->delta_move(delta, feedrate, 3);
 203
 204     // wait until finished
 205     THECONVEYOR->wait_for_idle();
 206
 207     // now see how far we moved, get delta in z we moved
 208     // NOTE this works for deltas as well as all three actuators move the same amount in Z
 209     mm= z_start_pos - THEROBOT->actuators[2]->get_current_position();
 210
 211     // set the last probe position to the actuator units moved during this home
 212     THEROBOT->set_last_probe_position(std::make_tuple(0, 0, mm, probe_detected?1:0));
 213
 214     probing= false;
 215
 216     if(probe_detected) {
 217         // if the probe stopped the move we need to correct the last_milestone as it did not reach where it thought
 218         THEROBOT->reset_position_from_current_actuator_position();
 219     }
 220
 221     return probe_detected;
 222 }
 223
 224 // do probe then return to start position
 225 bool ZProbe::run_probe_return(float& mm, float feedrate, float max_dist, bool reverse)
 226 {
 227     float save_z_pos= THEROBOT->get_axis_position(Z_AXIS);
 228
 229     bool ok= run_probe(mm, feedrate, max_dist, reverse);
 230
 231     // move probe back to where it was
 232     float fr;
 233     if(this->return_feedrate != 0) { // use return_feedrate if set
 234         fr = this->return_feedrate;
 235     } else {
 236         fr = this->slow_feedrate*2; // nominally twice slow feedrate
 237         if(fr > this->fast_feedrate) fr = this->fast_feedrate; // unless that is greater than fast feedrate
 238     }
 239
 240     // absolute move back to saved starting position
 241     coordinated_move(NAN, NAN, save_z_pos, fr, false);
 242
 243     return ok;
 244 }
 245
 246 bool ZProbe::doProbeAt(float &mm, float x, float y)
 247 {
 248     // move to xy
 249     coordinated_move(x, y, NAN, getFastFeedrate());
 250     return run_probe_return(mm, slow_feedrate);
 251 }
 252
 253 void ZProbe::on_gcode_received(void *argument)
 254 {
 255     Gcode *gcode = static_cast<Gcode *>(argument);
 256
 257     if( gcode->has_g && gcode->g >= 29 && gcode->g <= 32) {
 258
 259         // make sure the probe is defined and not already triggered before moving motors
 260         if(!this->pin.connected()) {
 261             gcode->stream->printf("ZProbe pin not configured.\n");
 262             return;
 263         }
 264
 265         if(this->pin.get()) {
 266             gcode->stream->printf("ZProbe triggered before move, aborting command.\n");
 267             return;
 268         }
 269
 270         if( gcode->g == 30 ) { // simple Z probe
 271             // first wait for all moves to finish
 272             THEKERNEL->conveyor->wait_for_idle();
 273
 274             bool set_z= (gcode->has_letter('Z') && !is_rdelta);
 275             bool probe_result;
 276             bool reverse= (gcode->has_letter('R') && gcode->get_value('R') != 0); // specify to probe in reverse direction
 277             float rate= gcode->has_letter('F') ? gcode->get_value('F') / 60 : this->slow_feedrate;
 278             float mm;
 279
 280             // if not setting Z then return probe to where it started, otherwise leave it where it is
 281             probe_result = (set_z ? run_probe(mm, rate, -1, reverse) : run_probe_return(mm, rate, -1, reverse));
 282
 283             if(probe_result) {
 284                 // the result is in actuator coordinates moved
 285                 gcode->stream->printf("Z:%1.4f\n", THEKERNEL->robot->from_millimeters(mm));
 286
 287                 if(set_z) {
 288                     // set current Z to the specified value, shortcut for G92 Znnn
 289                     char buf[32];
 290                     int n = snprintf(buf, sizeof(buf), "G92 Z%f", gcode->get_value('Z'));
 291                     string g(buf, n);
 292                     Gcode gc(g, &(StreamOutput::NullStream));
 293                     THEKERNEL->call_event(ON_GCODE_RECEIVED, &gc);
 294                 }
 295
 296             } else {
 297                 gcode->stream->printf("ZProbe not triggered\n");
 298             }
 299
 300         } else {
 301             if(!gcode->has_letter('P')) {
 302                 // find the first strategy to handle the gcode
 303                 for(auto s : strategies){
 304                     if(s->handleGcode(gcode)) {
 305                         return;
 306                     }
 307                 }
 308                 gcode->stream->printf("No strategy found to handle G%d\n", gcode->g);
 309
 310             }else{
 311                 // P paramater selects which strategy to send the code to
 312                 // they are loaded in the order they are defined in config, 0 being the first, 1 being the second and so on.
 313                 uint16_t i= gcode->get_value('P');
 314                 if(i < strategies.size()) {
 315                     if(!strategies[i]->handleGcode(gcode)){
 316                         gcode->stream->printf("strategy #%d did not handle G%d\n", i, gcode->g);
 317                     }
 318                     return;
 319
 320                 }else{
 321                     gcode->stream->printf("strategy #%d is not loaded\n", i);
 322                 }
 323             }
 324         }
 325
 326     } else if(gcode->has_g && gcode->g == 38 ) { // G38.2 Straight Probe with error, G38.3 straight probe without error
 327         // linuxcnc/grbl style probe http://www.linuxcnc.org/docs/2.5/html/gcode/gcode.html#sec:G38-probe
 328         if(gcode->subcode != 2 && gcode->subcode != 3) {
 329             gcode->stream->printf("error:Only G38.2 and G38.3 are supported\n");
 330             return;
 331         }
 332
 333         // make sure the probe is defined and not already triggered before moving motors
 334         if(!this->pin.connected()) {
 335             gcode->stream->printf("error:ZProbe not connected.\n");
 336             return;
 337         }
 338
 339         if(this->pin.get()) {
 340             gcode->stream->printf("error:ZProbe triggered before move, aborting command.\n");
 341             return;
 342         }
 343
 344         // first wait for all moves to finish
 345         THEKERNEL->conveyor->wait_for_idle();
 346
 347         float x= NAN, y=NAN, z=NAN;
 348         if(gcode->has_letter('X')) {
 349             x= gcode->get_value('X');
 350         }
 351
 352         if(gcode->has_letter('Y')) {
 353             y= gcode->get_value('Y');
 354         }
 355
 356         if(gcode->has_letter('Z')) {
 357             z= gcode->get_value('Z');
 358         }
 359
 360         if(isnan(x) && isnan(y) && isnan(z)) {
 361             gcode->stream->printf("error:at least one of X Y or Z must be specified\n");
 362             return;
 363         }
 364
 365         probe_XYZ(gcode, x, y, z);
 366
 367         return;
 368
 369     } else if(gcode->has_m) {
 370         // M code processing here
 371         int c;
 372         switch (gcode->m) {
 373             case 119:
 374                 c = this->pin.get();
 375                 gcode->stream->printf(" Probe: %d", c);
 376                 gcode->add_nl = true;
 377                 break;
 378
 379             case 670:
 380                 if (gcode->has_letter('S')) this->slow_feedrate = gcode->get_value('S');
 381                 if (gcode->has_letter('K')) this->fast_feedrate = gcode->get_value('K');
 382                 if (gcode->has_letter('R')) this->return_feedrate = gcode->get_value('R');
 383                 if (gcode->has_letter('Z')) this->max_z = gcode->get_value('Z');
 384                 if (gcode->has_letter('H')) this->probe_height = gcode->get_value('H');
 385                 if (gcode->has_letter('I')) { // NOTE this is temporary and toggles the invertion status of the pin
 386                     invert_override= (gcode->get_value('I') != 0);
 387                     pin.set_inverting(pin.is_inverting() != invert_override); // XOR so inverted pin is not inverted and vice versa
 388                 }
 389                 if (gcode->has_letter('D')) this->dwell_before_probing = gcode->get_value('D');
 390                 break;
 391
 392             case 500: // save settings
 393             case 503: // print settings
 394                 gcode->stream->printf(";Probe feedrates Slow/fast(K)/Return (mm/sec) max_z (mm) height (mm) dwell (s):\nM670 S%1.2f K%1.2f R%1.2f Z%1.2f H%1.2f D%1.2f\n",
 395                     this->slow_feedrate, this->fast_feedrate, this->return_feedrate, this->max_z, this->probe_height, this->dwell_before_probing);
 396
 397                 // fall through is intended so leveling strategies can handle m-codes too
 398
 399             default:
 400                 for(auto s : strategies){
 401                     if(s->handleGcode(gcode)) {
 402                         return;
 403                     }
 404                 }
 405         }
 406     }
 407 }
 408
 409 // special way to probe in the X or Y or Z direction using planned moves, should work with any kinematics
 410 void ZProbe::probe_XYZ(Gcode *gcode, float x, float y, float z)
 411 {
 412     // enable the probe checking in the timer
 413     probing= true;
 414     probe_detected= false;
 415     THEROBOT->disable_segmentation= true; // we must disable segmentation as this won't work with it enabled (beware on deltas probing in X or Y)
 416
 417     // get probe feedrate in mm/min and convert to mm/sec if specified
 418     float rate = (gcode->has_letter('F')) ? gcode->get_value('F')/60 : this->slow_feedrate;
 419
 420     // do a regular move which will stop as soon as the probe is triggered, or the distance is reached
 421     coordinated_move(x, y, z, rate, true);
 422
 423     // coordinated_move returns when the move is finished
 424
 425     // disable probe checking
 426     probing= false;
 427     THEROBOT->disable_segmentation= false;
 428
 429     // if the probe stopped the move we need to correct the last_milestone as it did not reach where it thought
 430     // this also sets last_milestone to the machine coordinates it stopped at
 431     THEROBOT->reset_position_from_current_actuator_position();
 432     float pos[3];
 433     THEROBOT->get_axis_position(pos, 3);
 434
 435     uint8_t probeok= this->probe_detected ? 1 : 0;
 436
 437     // print results using the GRBL format
 438     gcode->stream->printf("[PRB:%1.3f,%1.3f,%1.3f:%d]\n", THEKERNEL->robot->from_millimeters(pos[X_AXIS]), THEKERNEL->robot->from_millimeters(pos[Y_AXIS]), THEKERNEL->robot->from_millimeters(pos[Z_AXIS]), probeok);
 439     THEROBOT->set_last_probe_position(std::make_tuple(pos[X_AXIS], pos[Y_AXIS], pos[Z_AXIS], probeok));
 440
 441     if(probeok == 0 && gcode->subcode == 2) {
 442         // issue error if probe was not triggered and subcode == 2
 443         gcode->stream->printf("ALARM: Probe fail\n");
 444         THEKERNEL->call_event(ON_HALT, nullptr);
 445     }
 446 }
 447
 448 // issue a coordinated move directly to robot, and return when done
 449 // Only move the coordinates that are passed in as not nan
 450 // NOTE must use G53 to force move in machine coordinates and ignore any WCS offsets
 451 void ZProbe::coordinated_move(float x, float y, float z, float feedrate, bool relative)
 452 {
 453     #define CMDLEN 128
 454     char *cmd= new char[CMDLEN]; // use heap here to reduce stack usage
 455
 456     if(relative) strcpy(cmd, "G91 G0 ");
 457     else strcpy(cmd, "G53 G0 "); // G53 forces movement in machine coordinate system
 458
 459     if(!isnan(x)) {
 460         size_t n= strlen(cmd);
 461         snprintf(&cmd[n], CMDLEN-n, " X%1.3f", x);
 462     }
 463     if(!isnan(y)) {
 464         size_t n= strlen(cmd);
 465         snprintf(&cmd[n], CMDLEN-n, " Y%1.3f", y);
 466     }
 467     if(!isnan(z)) {
 468         size_t n= strlen(cmd);
 469         snprintf(&cmd[n], CMDLEN-n, " Z%1.3f", z);
 470     }
 471
 472     {
 473         size_t n= strlen(cmd);
 474         // use specified feedrate (mm/sec)
 475         snprintf(&cmd[n], CMDLEN-n, " F%1.1f", feedrate * 60); // feed rate is converted to mm/min
 476     }
 477
 478     if(relative) strcat(cmd, " G90");
 479
 480     //THEKERNEL->streams->printf("DEBUG: move: %s: %u\n", cmd, strlen(cmd));
 481
 482     // send as a command line as may have multiple G codes in it
 483     THEROBOT->push_state();
 484     struct SerialMessage message;
 485     message.message = cmd;
 486     delete [] cmd;
 487
 488     message.stream = &(StreamOutput::NullStream);
 489     THEKERNEL->call_event(ON_CONSOLE_LINE_RECEIVED, &message );
 490     THEKERNEL->conveyor->wait_for_idle();
 491     THEROBOT->pop_state();
 492
 493 }
 494
 495 // issue home command
 496 void ZProbe::home()
 497 {
 498     Gcode gc(THEKERNEL->is_grbl_mode() ? "G28.2" : "G28", &(StreamOutput::NullStream));
 499     THEKERNEL->call_event(ON_GCODE_RECEIVED, &gc);
 500 }