ffcc3470a3
- Significant improvements in the planner. Removed or reordered repetitive and expensive calculations by order of importance: recalculating unchanged blocks, trig functions [sin(), cos(), tan()], sqrt(), divides, and multiplications. Blocks long enough for nominal speed to be guaranteed to be reached ignored by planner. Done by introducing two uint8_t flags per block. Reduced computational overhead by an order of magnitude. - Arc motion generation completely re-written and optimized. Now runs with acceleration planner. Removed all but one trig function (atan2) from initialization. Streamlined computations. Segment target locations generated by vector transformation and small angle approximation. Arc path correction implemented for accumulated error of approximation and single precision calculation of Arduino. Bug fix in message passing.
78 lines
3.7 KiB
C
78 lines
3.7 KiB
C
/*
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planner.h - buffers movement commands and manages the acceleration profile plan
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Part of Grbl
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Copyright (c) 2009-2011 Simen Svale Skogsrud
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Modifications Copyright (c) 2011 Sungeun (Sonny) Jeon
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Grbl is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Grbl is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Grbl. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef planner_h
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#define planner_h
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#include <inttypes.h>
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// This struct is used when buffering the setup for each linear movement "nominal" values are as specified in
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// the source g-code and may never actually be reached if acceleration management is active.
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typedef struct {
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// Fields used by the bresenham algorithm for tracing the line
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uint32_t steps_x, steps_y, steps_z; // Step count along each axis
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uint8_t direction_bits; // The direction bit set for this block (refers to *_DIRECTION_BIT in config.h)
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int32_t step_event_count; // The number of step events required to complete this block
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uint32_t nominal_rate; // The nominal step rate for this block in step_events/minute
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// Fields used by the motion planner to manage acceleration
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double speed_x, speed_y, speed_z; // Nominal mm/minute for each axis
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double nominal_speed; // The nominal speed for this block in mm/min
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double entry_speed_sqr; // Square of entry speed at previous-current junction in (mm/min)^2
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double max_entry_speed_sqr; // Square of maximum allowable entry speed in (mm/min)^2
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double millimeters; // The total travel of this block in mm
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uint8_t recalculate_flag; // Planner flag to recalculate trapezoids on entry junction
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uint8_t nominal_length_flag; // Planner flag for nominal speed always reached
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// Settings for the trapezoid generator
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uint32_t initial_rate; // The jerk-adjusted step rate at start of block
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uint32_t final_rate; // The minimal rate at exit
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int32_t rate_delta; // The steps/minute to add or subtract when changing speed (must be positive)
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uint32_t accelerate_until; // The index of the step event on which to stop acceleration
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uint32_t decelerate_after; // The index of the step event on which to start decelerating
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} block_t;
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// Initialize the motion plan subsystem
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void plan_init();
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// Add a new linear movement to the buffer. x, y and z is the signed, absolute target position in
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// millimaters. Feed rate specifies the speed of the motion. If feed rate is inverted, the feed
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// rate is taken to mean "frequency" and would complete the operation in 1/feed_rate minutes.
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void plan_buffer_line(double x, double y, double z, double feed_rate, uint8_t invert_feed_rate);
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// Called when the current block is no longer needed. Discards the block and makes the memory
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// availible for new blocks.
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void plan_discard_current_block();
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// Gets the current block. Returns NULL if buffer empty
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block_t *plan_get_current_block();
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// Enables or disables acceleration-management for upcoming blocks
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void plan_set_acceleration_manager_enabled(uint8_t enabled);
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// Is acceleration-management currently enabled?
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int plan_is_acceleration_manager_enabled();
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// Reset the position vector
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void plan_set_current_position(double x, double y, double z);
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#endif |