2 This file is part of Smoothie (http://smoothieware.org/). The motion control part is heavily based on Grbl (https://github.com/simen/grbl) with additions from Sungeun K. Jeon (https://github.com/chamnit/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/>.
10 #include "libs/Module.h"
11 #include "libs/Kernel.h"
14 #include "StepperMotor.h"
16 #include "checksumm.h"
17 #include "SlowTicker.h"
19 #include "ConfigValue.h"
26 #include "libs/nuts_bolts.h"
27 #include "libs/Hook.h"
31 #define acceleration_ticks_per_second_checksum CHECKSUM("acceleration_ticks_per_second")
32 #define minimum_steps_per_minute_checksum CHECKSUM("minimum_steps_per_minute")
34 // The stepper reacts to blocks that have XYZ movement to transform them into actual stepper motor moves
35 // TODO: This does accel, accel should be in StepperMotor
38 this->current_block
= NULL
;
40 this->trapezoid_generator_busy
= false;
41 this->force_speed_update
= false;
44 //Called when the module has just been loaded
45 void Stepper::on_module_loaded(){
46 this->register_for_event(ON_BLOCK_BEGIN
);
47 this->register_for_event(ON_BLOCK_END
);
48 this->register_for_event(ON_GCODE_EXECUTE
);
49 this->register_for_event(ON_GCODE_RECEIVED
);
50 this->register_for_event(ON_PLAY
);
51 this->register_for_event(ON_PAUSE
);
52 this->register_for_event(ON_HALT
);
55 this->on_config_reload(this);
57 // Acceleration ticker
58 this->acceleration_tick_hook
= THEKERNEL
->slow_ticker
->attach( this->acceleration_ticks_per_second
, this, &Stepper::trapezoid_generator_tick
);
60 // Attach to the end_of_move stepper event
61 THEKERNEL
->robot
->alpha_stepper_motor
->attach(this, &Stepper::stepper_motor_finished_move
);
62 THEKERNEL
->robot
->beta_stepper_motor
->attach( this, &Stepper::stepper_motor_finished_move
);
63 THEKERNEL
->robot
->gamma_stepper_motor
->attach(this, &Stepper::stepper_motor_finished_move
);
66 // Get configuration from the config file
67 void Stepper::on_config_reload(void* argument
){
69 this->acceleration_ticks_per_second
= THEKERNEL
->config
->value(acceleration_ticks_per_second_checksum
)->by_default(100 )->as_number();
70 this->minimum_steps_per_second
= THEKERNEL
->config
->value(minimum_steps_per_minute_checksum
)->by_default(3000 )->as_number() / 60.0F
;
72 // Steppers start off by default
73 this->turn_enable_pins_off();
76 // When the play/pause button is set to pause, or a module calls the ON_PAUSE event
77 void Stepper::on_pause(void* argument
){
79 THEKERNEL
->robot
->alpha_stepper_motor
->pause();
80 THEKERNEL
->robot
->beta_stepper_motor
->pause();
81 THEKERNEL
->robot
->gamma_stepper_motor
->pause();
84 // When the play/pause button is set to play, or a module calls the ON_PLAY event
85 void Stepper::on_play(void* argument
){
86 // TODO: Re-compute the whole queue for a cold-start
88 THEKERNEL
->robot
->alpha_stepper_motor
->unpause();
89 THEKERNEL
->robot
->beta_stepper_motor
->unpause();
90 THEKERNEL
->robot
->gamma_stepper_motor
->unpause();
93 void Stepper::on_halt(void* argument
)
95 this->turn_enable_pins_off();
98 void Stepper::on_gcode_received(void* argument
){
99 Gcode
* gcode
= static_cast<Gcode
*>(argument
);
100 // Attach gcodes to the last block for on_gcode_execute
101 if( gcode
->has_m
&& (gcode
->m
== 84 || gcode
->m
== 17 || gcode
->m
== 18 )) {
102 THEKERNEL
->conveyor
->append_gcode(gcode
);
106 // React to enable/disable gcodes
107 void Stepper::on_gcode_execute(void* argument
){
108 Gcode
* gcode
= static_cast<Gcode
*>(argument
);
111 if( gcode
->m
== 17 ){
112 this->turn_enable_pins_on();
114 if( (gcode
->m
== 84 || gcode
->m
== 18) && !gcode
->has_letter('E') ){
115 this->turn_enable_pins_off();
121 void Stepper::turn_enable_pins_on(){
122 for (StepperMotor
* m
: THEKERNEL
->robot
->actuators
)
124 this->enable_pins_status
= true;
128 void Stepper::turn_enable_pins_off(){
129 for (StepperMotor
* m
: THEKERNEL
->robot
->actuators
)
131 this->enable_pins_status
= false;
134 // A new block is popped from the queue
135 void Stepper::on_block_begin(void* argument
){
136 Block
* block
= static_cast<Block
*>(argument
);
138 // The stepper does not care about 0-blocks
139 if( block
->millimeters
== 0.0F
){ return; }
141 // Mark the new block as of interrest to us
142 if( block
->steps
[ALPHA_STEPPER
] > 0 || block
->steps
[BETA_STEPPER
] > 0 || block
->steps
[GAMMA_STEPPER
] > 0 ){
148 // We can't move with the enable pins off
149 if( this->enable_pins_status
== false ){
150 this->turn_enable_pins_on();
153 // Setup : instruct stepper motors to move
154 if( block
->steps
[ALPHA_STEPPER
] > 0 ){ THEKERNEL
->robot
->alpha_stepper_motor
->move( block
->direction_bits
[ALPHA_STEPPER
], block
->steps
[ALPHA_STEPPER
] ); }
155 if( block
->steps
[BETA_STEPPER
] > 0 ){ THEKERNEL
->robot
->beta_stepper_motor
->move( block
->direction_bits
[BETA_STEPPER
], block
->steps
[BETA_STEPPER
] ); }
156 if( block
->steps
[GAMMA_STEPPER
] > 0 ){ THEKERNEL
->robot
->gamma_stepper_motor
->move( block
->direction_bits
[GAMMA_STEPPER
], block
->steps
[GAMMA_STEPPER
] ); }
158 this->current_block
= block
;
160 // Setup acceleration for this block
161 this->trapezoid_generator_reset();
163 // Find the stepper with the more steps, it's the one the speed calculations will want to follow
164 this->main_stepper
= THEKERNEL
->robot
->alpha_stepper_motor
;
165 if( THEKERNEL
->robot
->beta_stepper_motor
->steps_to_move
> this->main_stepper
->steps_to_move
){ this->main_stepper
= THEKERNEL
->robot
->beta_stepper_motor
; }
166 if( THEKERNEL
->robot
->gamma_stepper_motor
->steps_to_move
> this->main_stepper
->steps_to_move
){ this->main_stepper
= THEKERNEL
->robot
->gamma_stepper_motor
; }
168 // Set the initial speed for this move
169 this->trapezoid_generator_tick(0);
171 // Synchronise the acceleration curve with the stepping
172 this->synchronize_acceleration(0);
176 // Current block is discarded
177 void Stepper::on_block_end(void* argument
){
178 this->current_block
= NULL
; //stfu !
181 // When a stepper motor has finished it's assigned movement
182 uint32_t Stepper::stepper_motor_finished_move(uint32_t dummy
){
184 // We care only if none is still moving
185 if( THEKERNEL
->robot
->alpha_stepper_motor
->moving
|| THEKERNEL
->robot
->beta_stepper_motor
->moving
|| THEKERNEL
->robot
->gamma_stepper_motor
->moving
){ return 0; }
187 // This block is finished, release it
188 if( this->current_block
!= NULL
){
189 this->current_block
->release();
196 // This is called ACCELERATION_TICKS_PER_SECOND times per second by the step_event
197 // interrupt. It can be assumed that the trapezoid-generator-parameters and the
198 // current_block stays untouched by outside handlers for the duration of this function call.
199 uint32_t Stepper::trapezoid_generator_tick( uint32_t dummy
) {
201 // Do not do the accel math for nothing
202 if(this->current_block
&& !this->paused
&& this->main_stepper
->moving
) {
204 // Store this here because we use it a lot down there
205 uint32_t current_steps_completed
= this->main_stepper
->stepped
;
207 // Do not accel, just set the value
208 if( this->force_speed_update
){
209 this->force_speed_update
= false;
210 this->set_step_events_per_second(this->trapezoid_adjusted_rate
);
214 // If we are accelerating
215 if(current_steps_completed
<= this->current_block
->accelerate_until
+ 1) {
217 this->trapezoid_adjusted_rate
+= this->current_block
->rate_delta
;
218 if (this->trapezoid_adjusted_rate
> this->current_block
->nominal_rate
) {
219 this->trapezoid_adjusted_rate
= this->current_block
->nominal_rate
;
221 this->set_step_events_per_second(this->trapezoid_adjusted_rate
);
223 // If we are decelerating
224 }else if (current_steps_completed
> this->current_block
->decelerate_after
) {
226 // NOTE: We will only reduce speed if the result will be > 0. This catches small
227 // rounding errors that might leave steps hanging after the last trapezoid tick.
228 if(this->trapezoid_adjusted_rate
> this->current_block
->rate_delta
* 1.5F
) {
229 this->trapezoid_adjusted_rate
-= this->current_block
->rate_delta
;
231 this->trapezoid_adjusted_rate
= this->current_block
->rate_delta
* 1.5F
;
233 if(this->trapezoid_adjusted_rate
< this->current_block
->final_rate
) {
234 this->trapezoid_adjusted_rate
= this->current_block
->final_rate
;
236 this->set_step_events_per_second(this->trapezoid_adjusted_rate
);
238 // If we are cruising
240 // Make sure we cruise at exactly nominal rate
241 if (this->trapezoid_adjusted_rate
!= this->current_block
->nominal_rate
) {
242 this->trapezoid_adjusted_rate
= this->current_block
->nominal_rate
;
243 this->set_step_events_per_second(this->trapezoid_adjusted_rate
);
253 // Initializes the trapezoid generator from the current block. Called whenever a new
255 inline void Stepper::trapezoid_generator_reset(){
256 this->trapezoid_adjusted_rate
= this->current_block
->initial_rate
;
257 this->force_speed_update
= true;
258 this->trapezoid_tick_cycle_counter
= 0;
261 // Update the speed for all steppers
262 void Stepper::set_step_events_per_second( float steps_per_second
)
264 // We do not step slower than this, FIXME shoul dbe calculated for the slowest axis not the fastest
265 //steps_per_second = max(steps_per_second, this->minimum_steps_per_second);
266 if( steps_per_second
< this->minimum_steps_per_second
){
267 steps_per_second
= this->minimum_steps_per_second
;
270 // Instruct the stepper motors
271 if( THEKERNEL
->robot
->alpha_stepper_motor
->moving
){ THEKERNEL
->robot
->alpha_stepper_motor
->set_speed( steps_per_second
* ( (float)this->current_block
->steps
[ALPHA_STEPPER
] / (float)this->current_block
->steps_event_count
) ); }
272 if( THEKERNEL
->robot
->beta_stepper_motor
->moving
){ THEKERNEL
->robot
->beta_stepper_motor
->set_speed( steps_per_second
* ( (float)this->current_block
->steps
[BETA_STEPPER
] / (float)this->current_block
->steps_event_count
) ); }
273 if( THEKERNEL
->robot
->gamma_stepper_motor
->moving
){ THEKERNEL
->robot
->gamma_stepper_motor
->set_speed( steps_per_second
* ( (float)this->current_block
->steps
[GAMMA_STEPPER
] / (float)this->current_block
->steps_event_count
) ); }
275 // Other modules might want to know the speed changed
276 THEKERNEL
->call_event(ON_SPEED_CHANGE
, this);
280 // This function has the role of making sure acceleration and deceleration curves have their
281 // rhythm synchronized. The accel/decel must start at the same moment as the speed update routine
282 // This is caller in "step just occured" or "block just began" ( step Timer ) context, so we need to be fast.
283 // All we do is reset the other timer so that it does what we want
284 uint32_t Stepper::synchronize_acceleration(uint32_t dummy
){
286 // No move was done, this is called from on_block_begin
287 // This means we setup the accel timer in a way where it gets called right after
288 // we exit this step interrupt, and so that it is then in synch with
289 if( this->main_stepper
->stepped
== 0 ){
290 // Whatever happens, we must call the accel interrupt asap
291 // Because it will set the initial rate
292 // We also want to synchronize in case we start accelerating or decelerating now
294 // Accel interrupt must happen asap
295 NVIC_SetPendingIRQ(TIMER2_IRQn
);
296 // Synchronize both counters
297 LPC_TIM2
->TC
= LPC_TIM0
->TC
;
299 // If we start decelerating after this, we must ask the actuator to warn us
300 // so we can do what we do in the "else" bellow
301 if( this->current_block
->decelerate_after
> 0 && this->current_block
->decelerate_after
< this->main_stepper
->steps_to_move
){
302 this->main_stepper
->attach_signal_step(this->current_block
->decelerate_after
, this, &Stepper::synchronize_acceleration
);
305 // If we are called not at the first steps, this means we are beginning deceleration
306 NVIC_SetPendingIRQ(TIMER2_IRQn
);
307 // Synchronize both counters
308 LPC_TIM2
->TC
= LPC_TIM0
->TC
;