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Merge pull request #3438 from thinkyhead/rc_M109_residency_loop_fix

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Fix bug which can cause an infinite M109 loop
This commit is contained in:
Scott Lahteine 2016-04-08 21:36:30 -07:00
commit 6bd20371f0
1 changed files with 13 additions and 5 deletions
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18
Marlin/Marlin_main.cpp
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@ -4290,7 +4290,7 @@ inline void gcode_M109() {
#ifdef TEMP_RESIDENCY_TIME
long residency_start_ms = -1;
// Loop until the temperature has stabilized
#define TEMP_CONDITIONS (residency_start_ms < 0 || now < residency_start_ms + (TEMP_RESIDENCY_TIME) * 1000UL)
#define TEMP_CONDITIONS (residency_start_ms == -1 || now < residency_start_ms + (TEMP_RESIDENCY_TIME) * 1000UL)
#else
// Loop until the temperature is very close target
#define TEMP_CONDITIONS (isHeatingHotend(target_extruder))
@ -4307,7 +4307,7 @@ inline void gcode_M109() {
#endif
#ifdef TEMP_RESIDENCY_TIME
SERIAL_PROTOCOLPGM(" W:");
if (residency_start_ms >= 0) {
if (residency_start_ms != -1) {
long rem = (((TEMP_RESIDENCY_TIME) * 1000UL) - (now - residency_start_ms)) / 1000UL;
SERIAL_PROTOCOLLN(rem);
}
@ -4323,10 +4323,18 @@ inline void gcode_M109() {
refresh_cmd_timeout(); // to prevent stepper_inactive_time from running out
#ifdef TEMP_RESIDENCY_TIME
// Start the TEMP_RESIDENCY_TIME timer when we reach target temp for the first time.
// Restart the timer whenever the temperature falls outside the hysteresis.
if (labs(degHotend(target_extruder) - degTargetHotend(target_extruder)) > ((residency_start_ms < 0) ? TEMP_WINDOW : TEMP_HYSTERESIS))
float temp_diff = labs(degHotend(target_extruder) - degTargetHotend(target_extruder));
if (residency_start_ms == -1) {
// Start the TEMP_RESIDENCY_TIME timer when we reach target temp for the first time.
if (temp_diff < TEMP_WINDOW) residency_start_ms = millis();
}
else if (temp_diff > TEMP_HYSTERESIS) {
// Restart the timer whenever the temperature falls outside the hysteresis.
residency_start_ms = millis();
}
#endif //TEMP_RESIDENCY_TIME
} // while(!cancel_heatup && TEMP_CONDITIONS)