Fix bug which can cause an infinite M109 loop
Since residency_start_ms is -1 when entering the heatup while loop whilst the hotend temp is close to the target them already then it may not escape. Hence "Start the TEMP_RESIDENCY_TIME timer when we reach target temp for the first time."
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@ -4325,7 +4325,8 @@ inline void gcode_M109() {
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#ifdef TEMP_RESIDENCY_TIME
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// Start the TEMP_RESIDENCY_TIME timer when we reach target temp for the first time.
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// Restart the timer whenever the temperature falls outside the hysteresis.
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if (labs(degHotend(target_extruder) - degTargetHotend(target_extruder)) > ((residency_start_ms < 0) ? TEMP_WINDOW : TEMP_HYSTERESIS))
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if ((residency_start_ms <= 0 && labs(degHotend(target_extruder) - degTargetHotend(target_extruder)) < TEMP_WINDOW) ||
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(labs(degHotend(target_extruder) - degTargetHotend(target_extruder)) > ((residency_start_ms < 0) ? TEMP_WINDOW : TEMP_HYSTERESIS)))
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residency_start_ms = millis();
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#endif //TEMP_RESIDENCY_TIME
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