Reading STM32 timer value

Question

I am using a STM32F103 chip and I am trying to configure and use one of the timers. I have used STM32CubeMX to generation code which initializes Timer 2. I start the timer by calling HAL_TIM_Base_Start. Then, in a loop, I print out the current timer value via a call to htim2.Instance->CNT, or alternately by calling the macro __HAL_TIM_GetCounter (which I believe just returns the same value). However, no matter what I do, the count value shows up as zero. I have also tried calling __TIM2_CLK_ENABLE() at the beginning, but it makes no difference.

I have searched for a solution and have found a couple of questions about this issue, but have not found the solution.

Does anyone know what I am doing wrong?

Thanks.

Here is the routine that initializes the timer. This code was generated by STM32CubeMX and I have not modified it:

/* TIM2 init function */
static void MX_TIM2_Init(void)
{

  TIM_ClockConfigTypeDef sClockSourceConfig;
  TIM_MasterConfigTypeDef sMasterConfig;

  htim2.Instance = TIM2;
  htim2.Init.Prescaler = 0;
  htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim2.Init.Period = 0;
  htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
  {
    _Error_Handler(__FILE__, __LINE__);
  }

}

Then in the main I attempt to start the timer and attempt to print out it's value. This is the code that I use to do that:

__TIM2_CLK_ENABLE();;
HAL_TIM_Base_Start(&htim2);

while (true)
{
    Serial.println((long) __HAL_TIM_GetCounter(&htim2));
    delay(100);
}

The 'Serial' class is a class that I wrote which communicates with my PC via a USB serial port.

Answer 1

Try it without HAL, it's not complicated.

void start_TIM2() {
  RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;
  TIM2->CR1 |= TIM_CR1_EN;
}

uint16_t read_TIM2() {
  return TIM2->CNT;
}