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How to make a 1 us interrupt timer in stm32f103?

MohsenJanlou

Hello, i want to make a 1 us interrupt timer in for my stm32f103 in timer 2, i could make 10 us n 5 us, but in lower than that its not working truely! what should i do?!

/* 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 = 359;
	
  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__);
  }

}

it's workin with this for 5 us.

Parents
  • 0 in reply to MohsenJanlou
    MohsenJanlou said:
    I expect to get 1us,

    And how do arrive at that expectation?  How did you check you haven't reached it?

    Please note that looking at the input state every microsecond in an interrupt handler is hardly the optimal way of measuring a frequency at that input.  That's what timers have input capture modes (and corresponding input pins) for.

Reply
  • 0 in reply to MohsenJanlou
    MohsenJanlou said:
    I expect to get 1us,

    And how do arrive at that expectation?  How did you check you haven't reached it?

    Please note that looking at the input state every microsecond in an interrupt handler is hardly the optimal way of measuring a frequency at that input.  That's what timers have input capture modes (and corresponding input pins) for.

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