HAL_StatusTypeDef HAL_TIM_ConfigClockSource()

in CMake-armcc/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_tim.c [5290:5428]
94 lines of code
11 McCabe index (conditional complexity)

HAL_StatusTypeDef HAL_TIM_ConfigClockSource(TIM_HandleTypeDef *htim, TIM_ClockConfigTypeDef *sClockSourceConfig)
{
  uint32_t tmpsmcr;

  /* Process Locked */
  __HAL_LOCK(htim);

  htim->State = HAL_TIM_STATE_BUSY;

  /* Check the parameters */
  assert_param(IS_TIM_CLOCKSOURCE(sClockSourceConfig->ClockSource));

  /* Reset the SMS, TS, ECE, ETPS and ETRF bits */
  tmpsmcr = htim->Instance->SMCR;
  tmpsmcr &= ~(TIM_SMCR_SMS | TIM_SMCR_TS);
  tmpsmcr &= ~(TIM_SMCR_ETF | TIM_SMCR_ETPS | TIM_SMCR_ECE | TIM_SMCR_ETP);
  htim->Instance->SMCR = tmpsmcr;

  switch (sClockSourceConfig->ClockSource)
  {
    case TIM_CLOCKSOURCE_INTERNAL:
    {
      assert_param(IS_TIM_INSTANCE(htim->Instance));
      break;
    }

    case TIM_CLOCKSOURCE_ETRMODE1:
    {
      /* Check whether or not the timer instance supports external trigger input mode 1 (ETRF)*/
      assert_param(IS_TIM_CLOCKSOURCE_ETRMODE1_INSTANCE(htim->Instance));

      /* Check ETR input conditioning related parameters */
      assert_param(IS_TIM_CLOCKPRESCALER(sClockSourceConfig->ClockPrescaler));
      assert_param(IS_TIM_CLOCKPOLARITY(sClockSourceConfig->ClockPolarity));
      assert_param(IS_TIM_CLOCKFILTER(sClockSourceConfig->ClockFilter));

      /* Configure the ETR Clock source */
      TIM_ETR_SetConfig(htim->Instance,
                        sClockSourceConfig->ClockPrescaler,
                        sClockSourceConfig->ClockPolarity,
                        sClockSourceConfig->ClockFilter);

      /* Select the External clock mode1 and the ETRF trigger */
      tmpsmcr = htim->Instance->SMCR;
      tmpsmcr |= (TIM_SLAVEMODE_EXTERNAL1 | TIM_CLOCKSOURCE_ETRMODE1);
      /* Write to TIMx SMCR */
      htim->Instance->SMCR = tmpsmcr;
      break;
    }

    case TIM_CLOCKSOURCE_ETRMODE2:
    {
      /* Check whether or not the timer instance supports external trigger input mode 2 (ETRF)*/
      assert_param(IS_TIM_CLOCKSOURCE_ETRMODE2_INSTANCE(htim->Instance));

      /* Check ETR input conditioning related parameters */
      assert_param(IS_TIM_CLOCKPRESCALER(sClockSourceConfig->ClockPrescaler));
      assert_param(IS_TIM_CLOCKPOLARITY(sClockSourceConfig->ClockPolarity));
      assert_param(IS_TIM_CLOCKFILTER(sClockSourceConfig->ClockFilter));

      /* Configure the ETR Clock source */
      TIM_ETR_SetConfig(htim->Instance,
                        sClockSourceConfig->ClockPrescaler,
                        sClockSourceConfig->ClockPolarity,
                        sClockSourceConfig->ClockFilter);
      /* Enable the External clock mode2 */
      htim->Instance->SMCR |= TIM_SMCR_ECE;
      break;
    }

    case TIM_CLOCKSOURCE_TI1:
    {
      /* Check whether or not the timer instance supports external clock mode 1 */
      assert_param(IS_TIM_CLOCKSOURCE_TIX_INSTANCE(htim->Instance));

      /* Check TI1 input conditioning related parameters */
      assert_param(IS_TIM_CLOCKPOLARITY(sClockSourceConfig->ClockPolarity));
      assert_param(IS_TIM_CLOCKFILTER(sClockSourceConfig->ClockFilter));

      TIM_TI1_ConfigInputStage(htim->Instance,
                               sClockSourceConfig->ClockPolarity,
                               sClockSourceConfig->ClockFilter);
      TIM_ITRx_SetConfig(htim->Instance, TIM_CLOCKSOURCE_TI1);
      break;
    }

    case TIM_CLOCKSOURCE_TI2:
    {
      /* Check whether or not the timer instance supports external clock mode 1 (ETRF)*/
      assert_param(IS_TIM_CLOCKSOURCE_TIX_INSTANCE(htim->Instance));

      /* Check TI2 input conditioning related parameters */
      assert_param(IS_TIM_CLOCKPOLARITY(sClockSourceConfig->ClockPolarity));
      assert_param(IS_TIM_CLOCKFILTER(sClockSourceConfig->ClockFilter));

      TIM_TI2_ConfigInputStage(htim->Instance,
                               sClockSourceConfig->ClockPolarity,
                               sClockSourceConfig->ClockFilter);
      TIM_ITRx_SetConfig(htim->Instance, TIM_CLOCKSOURCE_TI2);
      break;
    }

    case TIM_CLOCKSOURCE_TI1ED:
    {
      /* Check whether or not the timer instance supports external clock mode 1 */
      assert_param(IS_TIM_CLOCKSOURCE_TIX_INSTANCE(htim->Instance));

      /* Check TI1 input conditioning related parameters */
      assert_param(IS_TIM_CLOCKPOLARITY(sClockSourceConfig->ClockPolarity));
      assert_param(IS_TIM_CLOCKFILTER(sClockSourceConfig->ClockFilter));

      TIM_TI1_ConfigInputStage(htim->Instance,
                               sClockSourceConfig->ClockPolarity,
                               sClockSourceConfig->ClockFilter);
      TIM_ITRx_SetConfig(htim->Instance, TIM_CLOCKSOURCE_TI1ED);
      break;
    }

    case TIM_CLOCKSOURCE_ITR0:
    case TIM_CLOCKSOURCE_ITR1:
    case TIM_CLOCKSOURCE_ITR2:
    case TIM_CLOCKSOURCE_ITR3:
      {
        /* Check whether or not the timer instance supports internal trigger input */
        assert_param(IS_TIM_CLOCKSOURCE_ITRX_INSTANCE(htim->Instance));

        TIM_ITRx_SetConfig(htim->Instance, sClockSourceConfig->ClockSource);
        break;
      }

    default:
      break;
  }
  htim->State = HAL_TIM_STATE_READY;

  __HAL_UNLOCK(htim);

  return HAL_OK;
}