bissen21/Marlin_Firmware
1
0
Fork 0
Code Issues Pull Requests Projects Releases 4 Wiki Activity

Ensure smooth print moves even with LCD enabled

Browse Source 
lcd_update can take so much time that the block buffer gets drained if
there are only short segments. This leads to jerky printer movements for
example in circles and a bad print quality.

This change implements a simple check: Only if the block currently
executed is long enough, run lcd_update.
This also means the printer will not show actual values on the LCD nor
will it respond to buttons pressed. A option that keeps the menu
accessible is also available.
Aditionaly, slow down if a block would be so fast that adding a new
block to the buffer would take more time. In this case, the buffer would
drain until it's empty in worst case.
This commit is contained in:
Sebastianv650
2016-11-11 18:15:39 +01:00
committed by Scott Lahteine
parent 0be6167f14
commit de89dc9f04
4 changed files with 68 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
Marlin/planner.cpp
View File

@ -937,12 +937,24 @@ void Planner::_buffer_line(const float &a, const float &b, const float &c, const
if (segment_time < min_segment_time) {
// buffer is draining, add extra time. The amount of time added increases if the buffer is still emptied more.
inverse_mm_s = 1000000.0 / (segment_time + lround(2 * (min_segment_time - segment_time) / moves_queued));
#ifdef XY_FREQUENCY_LIMIT
#if defined(XY_FREQUENCY_LIMIT) || ENABLED(ENSURE_SMOOTH_MOVES)
segment_time = lround(1000000.0 / inverse_mm_s);
#endif
}
}
#endif
#if ENABLED(ENSURE_SMOOTH_MOVES)
#if DISABLED(SLOWDOWN)
unsigned long segment_time = lround(1000000.0 / inverse_mm_s);
#endif
if (segment_time < (MIN_BLOCK_TIME) * 1000UL) {
// buffer will be draining, set to MIN_BLOCK_TIME.
inverse_mm_s = 1000000.0 / (1000.0 * (MIN_BLOCK_TIME));
segment_time = (MIN_BLOCK_TIME) * 1000UL;
}
block->segment_time = segment_time;
#endif
block->nominal_speed = block->millimeters * inverse_mm_s; // (mm/sec) Always > 0
block->nominal_rate = ceil(block->step_event_count * inverse_mm_s); // (step/sec) Always > 0