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HardwareTimer: set callback before enabling interrupt #835

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Merged
merged 1 commit into from
Dec 16, 2019
Merged

HardwareTimer: set callback before enabling interrupt #835

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4 changes: 2 additions & 2 deletions cores/arduino/HardwareTimer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -848,13 +848,13 @@ void HardwareTimer::setInterruptPriority(uint32_t preemptPriority, uint32_t subP
*/
void HardwareTimer::attachInterrupt(void (*callback)(HardwareTimer *))
{
callbacks[0] = callback;
if (callback != NULL) {
// Clear flag before enabling IT
__HAL_TIM_CLEAR_FLAG(&(_timerObj.handle), TIM_FLAG_UPDATE);
// Enable update interrupt only if callback is valid
__HAL_TIM_ENABLE_IT(&(_timerObj.handle), TIM_IT_UPDATE);
}
callbacks[0] = callback;
}

/**
Expand Down Expand Up @@ -885,13 +885,13 @@ void HardwareTimer::attachInterrupt(uint32_t channel, void (*callback)(HardwareT
Error_Handler(); // only channel 1..4 have an interrupt
}

callbacks[channel] = callback;
if (callback != NULL) {
// Clear flag before enabling IT
__HAL_TIM_CLEAR_FLAG(&(_timerObj.handle), interrupt);
// Enable interrupt corresponding to channel, only if callback is valid
__HAL_TIM_ENABLE_IT(&(_timerObj.handle), interrupt);
}
callbacks[channel] = callback;
}

/**
Expand Down