How can I access registers directly?

[PerennialNovice]

I am trying to access HW registers directly, for example Timer 2

If I write

  TIM2->CCMR1 = 1;
  Serial.print("TIM2->CCMR1: ");
  Serial.println(TIM2->CCMR1);
  TIM2->CR1 = 1;
  Serial.print("TIM2->CR1: ");
  Serial.println(TIM2->CR1);

I get

TIM2->CCMR1: 0
TIM2->CR1: 0

but, when I use API functions first, like

  HardwareTimer *MyTim = new HardwareTimer(TIM2);
  MyTim->setMode(1, TIMER_INPUT_FREQ_DUTY_MEASUREMENT, PA5);
  Serial.print("TIM2->CCMR1: ");
  Serial.println(TIM2->CCMR1);
  Serial.print("TIM2->CR1: ");
  Serial.println(TIM2->CR1);

I get

TIM2->CCMR1: 513
TIM2->CR1: 128

Now I also can assign custom values to the registers directly...
It is even sufficient to cerate the HardwareTimer object

Do I have to "activate" the TIM2 register variable somehow?

[fpistm]

Hi @MasteringTheMess
As a first guess, I would recommend to enable the clock

__HAL_RCC_TIM2_CLK_ENABLE();

[PerennialNovice]

A very good guess, indeed :)

That did the trick, thank you.

can also be achieved by configuring the register directly:

RCC->APB1ENR1 |= RCC_APB1ENR1_TIM2EN;

[fpistm]

Welcome

[PerennialNovice]

the corresponding information is also in the datasheet, but not at the peripheral register description.
It is included at the peripheral clock enable register !