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Prevent re-entering of temperature ISR

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If Marlin is inside the temperature ISR, the stepper ISR is enabled. If
a stepper event is now happening Marlin will proceed with the stepper
ISR. Now, at the end of the stepper ISR, the temperatre ISR gets enabled
again. While Marlin proceed the rest of the temperature ISR, it's now
vulnerable to a second ISR call.
This commit is contained in:
Sebastianv650 2017-02-12 18:00:14 +01:00 committed by Scott Lahteine
parent 1b59766fcb
commit 271ced7341
2 changed files with 12 additions and 1 deletions
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9
Marlin/temperature.cpp
View file

@ -1483,7 +1483,14 @@ void Temperature::set_current_temp_raw() {
*/
ISR(TIMER0_COMPB_vect) { Temperature::isr(); }
volatile bool Temperature::in_temp_isr = false;
void Temperature::isr() {
// The stepper ISR can interrupt this ISR. When it does it re-enables this ISR
// at the end of its run, potentially causing re-entry. This flag prevents it.
if (in_temp_isr) return;
in_temp_isr = true;
// Allow UART and stepper ISRs
CBI(TIMSK0, OCIE0B); //Disable Temperature ISR
sei();
@ -1949,5 +1956,7 @@ void Temperature::isr() {
}
#endif
cli();
in_temp_isr = false;
SBI(TIMSK0, OCIE0B); //re-enable Temperature ISR
}

2
Marlin/temperature.h
View file

@ -61,6 +61,8 @@ class Temperature {
current_temperature_bed_raw,
target_temperature_bed;
static volatile bool in_temp_isr;
#if ENABLED(TEMP_SENSOR_1_AS_REDUNDANT)
static float redundant_temperature;
#endif