HardwareTimer: set pin output to low after pausing the timer

[PerennialNovice]

I use hardware timers and on one pin I toggle a LED and at some point I want it to stop blinking and just be off.
Now, using myTim->pause() just stops the timer and depending on whatever state the LED was, it just stays there.

Now I simply do digitalWrite(myLED, LOW) afterwards, but somehow I am not convinced this is the best way to achieve my goal ...

What would be the "official" way to do this?

[fpistm]

How you toggle it? With digitalWrite in the timer callback? If yes then using digitalWrite low seems the best option

[PerennialNovice]

No, I toggle it using the timer functionality:

MyTim->setMode(2, TIMER_OUTPUT_COMPARE_TOGGLE, redLEDPin);
MyTim->setOverflow(1000000, MICROSEC_FORMAT);
MyTim->setCaptureCompare(2, 50, PERCENT_COMPARE_FORMAT);
MyTim->resume();

[fpistm]

By default pin is configured GPIO_PULLUP.
You can try to redefine the PinMap_TIM to set the pin as GPIO_PULLDOWN.
Example:

const PinMap PinMap_TIM[] = {
  {PA_0,      TIM2,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLDOWN, GPIO_AF1_TIM2, 1, 0)}, // TIM2_CH1
  {PA_0_ALT1, TIM5,  STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLDOWN, GPIO_AF2_TIM5, 1, 0)}, // TIM5_CH1
...
};

[PerennialNovice]

seems to have no effect
or I did it wrong?
I copied the PinMap part out of PeripheralPins.c into the .h of my project and removed the weak keyword and changed all GPIO_PULLUP to GPIO_PULLDOWN

BTW, digitalWrite did not work either

[PerennialNovice]

a not very elegant workaround:

while(digitalRead(redLEDPin) == HIGH);
MyTim->pause();

only possible because timing is not critical at all

[fpistm]

Could you be more precise on your setup?
Board used? Pin of the LED? How the LED is wired?

[PerennialNovice]

of course, sorry...

Nucleo-L412 slightly modified:

SB9 to ST-Link Reset removed
SB16 and SB18 removed to have SPI on PA4, PA5, PA6, PA7
SB12 removed to be able to enter USB DFU boot mode

LED is connected through 330Ohm resistor directly to PB3

[fpistm]

Hi @PerennialNovice
I found the correct way to do this.
In fact you don't need to pause the timer.
Simpy change the mode to

MyTim->setMode(2, TIMER_OUTPUT_COMPARE_FORCED_INACTIVE, redLEDPin);

Then to restore:
MyTim->setMode(2, TIMER_OUTPUT_COMPARE_TOGGLE, redLEDPin);

[PerennialNovice]

Thanks a lot @fpistm !

Works like a charm :)