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Enable timer preload function to prevent output glitches #224

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Enable timer preload function to prevent output glitches #224

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9 changes: 8 additions & 1 deletion cores/arduino/HardwareTimer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -783,7 +783,14 @@ void HardwareTimer::setMode(uint32_t channel, TimerModes_t mode, PinName pin)

/* Configure some default values. Maybe overwritten later */
channelOC.TIM_OCMode = TIMER_NOT_USED; //set default value 0xFFFF


// Enable preload (shadow registers) for timer channel to prevent output glitches
// Ensures compare register updates only take effect at timer overflow/update events
TIM_OC1PreloadConfig(_timerObj.handle.Instance, TIM_OCPreload_Enable);
TIM_OC2PreloadConfig(_timerObj.handle.Instance, TIM_OCPreload_Enable);
TIM_OC3PreloadConfig(_timerObj.handle.Instance, TIM_OCPreload_Enable);
TIM_OC4PreloadConfig(_timerObj.handle.Instance, TIM_OCPreload_Enable);

// channelOC.Pulse = __HAL_TIM_GET_COMPARE(&(_timerObj.handle), timChannel); // keep same value already written in hardware register
channelOC.TIM_Pulse = (((timChannel) == TIM_Channel_1) ? (_timerObj.handle.Instance->CH1CVR) :\
((timChannel) == TIM_Channel_2) ? (_timerObj.handle.Instance->CH2CVR) :\
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