ManuelW/grbl-LPC-CoreXY
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added a fix for division by zero errors that would occur on very low feed rates (thanks to Arthur Wolf for hardcore investigation)

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Simen Svale Skogsrud 2011-05-31 18:37:37 +02:00
parent a25812f36b
commit f4c1cbac3c
1 changed files with 4 additions and 0 deletions
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planner.c
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@ -354,6 +354,10 @@ void plan_buffer_line(double x, double y, double z, double feed_rate, int invert
block->nominal_rate = ceil(block->step_event_count * multiplier); block->nominal_rate = ceil(block->step_event_count * multiplier);
block->entry_factor = 0.0; block->entry_factor = 0.0;
// This is a temporary fix to avoid a situation where very low nominal_speeds would be rounded
// down to zero and cause a division by zero. TODO: Grbl deserves a less patchy fix for this problem
if (block->nominal_speed < 60.0) { block->nominal_speed = 60.0; }
// Compute the acceleration rate for the trapezoid generator. Depending on the slope of the line // Compute the acceleration rate for the trapezoid generator. Depending on the slope of the line
// average travel per step event changes. For a line along one axis the travel per step event // average travel per step event changes. For a line along one axis the travel per step event
// is equal to the travel/step in the particular axis. For a 45 degree line the steppers of both // is equal to the travel/step in the particular axis. For a 45 degree line the steppers of both