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Merge pull request #7094 from thinkyhead/bf_fix_advance_rate

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Fix #5699 - LIN_ADVANCE freeze when ADV_RATE returns 0
This commit is contained in:
Scott Lahteine 2017-06-19 16:38:41 -05:00 committed by GitHub
commit 17f69f8ca2
1 changed files with 18 additions and 5 deletions
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23
Marlin/stepper.cpp
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@ -110,9 +110,22 @@ volatile uint32_t Stepper::step_events_completed = 0; // The number of step even
Stepper::advance;
#endif
#define ADV_RATE(T, L) (e_steps[TOOL_E_INDEX] ? (T) * (L) / abs(e_steps[TOOL_E_INDEX]) : ADV_NEVER)
/**
* See https://github.com/MarlinFirmware/Marlin/issues/5699#issuecomment-309264382
*
* This fix isn't perfect and may lose steps - but better than locking up completely
* in future the planner should slow down if advance stepping rate would be too high
*/
FORCE_INLINE uint16_t adv_rate(const int steps, const uint16_t timer, const uint8_t loops) {
if (steps) {
const uint16_t rate = (timer * loops) / abs(steps);
//return constrain(rate, 1, ADV_NEVER - 1)
return rate ? rate : 1;
}
return ADV_NEVER;
}
#endif
#endif // ADVANCE || LIN_ADVANCE
long Stepper::acceleration_time, Stepper::deceleration_time;
@ -743,7 +756,7 @@ void Stepper::isr() {
#endif // ADVANCE or LIN_ADVANCE
#if ENABLED(ADVANCE) || ENABLED(LIN_ADVANCE)
eISR_Rate = ADV_RATE(timer, step_loops);
eISR_Rate = adv_rate(e_steps[TOOL_E_INDEX], timer, step_loops);
#endif
}
else if (step_events_completed > (uint32_t)current_block->decelerate_after) {
@ -797,7 +810,7 @@ void Stepper::isr() {
#endif // ADVANCE or LIN_ADVANCE
#if ENABLED(ADVANCE) || ENABLED(LIN_ADVANCE)
eISR_Rate = ADV_RATE(timer, step_loops);
eISR_Rate = adv_rate(e_steps[TOOL_E_INDEX], timer, step_loops);
#endif
}
else {
@ -807,7 +820,7 @@ void Stepper::isr() {
if (current_block->use_advance_lead)
current_estep_rate[TOOL_E_INDEX] = final_estep_rate;
eISR_Rate = ADV_RATE(OCR1A_nominal, step_loops_nominal);
eISR_Rate = adv_rate(e_steps[TOOL_E_INDEX], OCR1A_nominal, step_loops_nominal);
#endif