stm32l4xx_hal_comp.c

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/* Includes ------------------------------------------------------------------*/
#include "stm32l4xx_hal.h"

#ifdef HAL_COMP_MODULE_ENABLED

#if defined (COMP1) || defined (COMP2)

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Delay for COMP startup time.                                               */
/* Note: Delay required to reach propagation delay specification.             */
/* Literal set to maximum value (refer to device datasheet,                   */
/* parameter "tSTART").                                                       */
/* Unit: us                                                                   */
#define COMP_DELAY_STARTUP_US          (80UL) 
/* Delay for COMP voltage scaler stabilization time.                          */
/* Literal set to maximum value (refer to device datasheet,                   */
/* parameter "tSTART_SCALER").                                                */
/* Unit: us                                                                   */
#define COMP_DELAY_VOLTAGE_SCALER_STAB_US (200UL)  
#define COMP_OUTPUT_LEVEL_BITOFFSET_POS    (30UL)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Exported functions --------------------------------------------------------*/

HAL_StatusTypeDef HAL_COMP_Init(COMP_HandleTypeDef *hcomp)
{
  uint32_t tmp_csr;
  uint32_t exti_line;
  uint32_t comp_voltage_scaler_initialized; /* Value "0" if comparator voltage scaler is not initialized */
  __IO uint32_t wait_loop_index = 0UL;
  HAL_StatusTypeDef status = HAL_OK;

  /* Check the COMP handle allocation and lock status */
  if(hcomp == NULL)
  {
    status = HAL_ERROR;
  }
  else if(__HAL_COMP_IS_LOCKED(hcomp))
  {
    status = HAL_ERROR;
  }
  else
  {
    /* Check the parameters */
    assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));
    assert_param(IS_COMP_INPUT_PLUS(hcomp->Instance, hcomp->Init.NonInvertingInput));
    assert_param(IS_COMP_INPUT_MINUS(hcomp->Instance, hcomp->Init.InvertingInput));
    assert_param(IS_COMP_OUTPUTPOL(hcomp->Init.OutputPol));
    assert_param(IS_COMP_POWERMODE(hcomp->Init.Mode));
    assert_param(IS_COMP_HYSTERESIS(hcomp->Init.Hysteresis));
    assert_param(IS_COMP_BLANKINGSRC_INSTANCE(hcomp->Instance, hcomp->Init.BlankingSrce));
    assert_param(IS_COMP_TRIGGERMODE(hcomp->Init.TriggerMode));
#if defined(COMP2)
    assert_param(IS_COMP_WINDOWMODE(hcomp->Init.WindowMode));
#endif

    if(hcomp->State == HAL_COMP_STATE_RESET)
    {
      /* Allocate lock resource and initialize it */
      hcomp->Lock = HAL_UNLOCKED;

      /* Set COMP error code to none */
      COMP_CLEAR_ERRORCODE(hcomp);

      /* Init SYSCFG and the low level hardware to access comparators */
      /* Note: HAL_COMP_Init() calls __HAL_RCC_SYSCFG_CLK_ENABLE()            */
      /*       to enable internal control clock of the comparators.           */
      /*       However, this is a legacy strategy. In future STM32 families,  */
      /*       COMP clock enable must be implemented by user                  */
      /*       in "HAL_COMP_MspInit()".                                       */
      /*       Therefore, for compatibility anticipation, it is recommended   */
      /*       to implement __HAL_RCC_SYSCFG_CLK_ENABLE()                     */
      /*       in "HAL_COMP_MspInit()".                                       */
      __HAL_RCC_SYSCFG_CLK_ENABLE();

#if (USE_HAL_COMP_REGISTER_CALLBACKS == 1)
      /* Init the COMP Callback settings */
      hcomp->TriggerCallback = HAL_COMP_TriggerCallback; /* Legacy weak callback */

      if (hcomp->MspInitCallback == NULL)
      {
        hcomp->MspInitCallback = HAL_COMP_MspInit; /* Legacy weak MspInit  */
      }

      /* Init the low level hardware */
      hcomp->MspInitCallback(hcomp);
#else
      /* Init the low level hardware */
      HAL_COMP_MspInit(hcomp);
#endif /* USE_HAL_COMP_REGISTER_CALLBACKS */
    }

    /* Memorize voltage scaler state before initialization */
    comp_voltage_scaler_initialized = READ_BIT(hcomp->Instance->CSR, COMP_CSR_SCALEN);

    /* Set COMP parameters */
    tmp_csr = (  hcomp->Init.NonInvertingInput
               | hcomp->Init.InvertingInput
               | hcomp->Init.BlankingSrce
               | hcomp->Init.Hysteresis
               | hcomp->Init.OutputPol
               | hcomp->Init.Mode
              );

    /* Set parameters in COMP register */
    /* Note: Update all bits except read-only, lock and enable bits */
#if defined (COMP_CSR_INMESEL)
#if defined (COMP_CSR_WINMODE)
    MODIFY_REG(hcomp->Instance->CSR,
               COMP_CSR_PWRMODE  | COMP_CSR_INMSEL   | COMP_CSR_INPSEL  |
               COMP_CSR_WINMODE  | COMP_CSR_POLARITY | COMP_CSR_HYST    |
               COMP_CSR_BLANKING | COMP_CSR_BRGEN    | COMP_CSR_SCALEN  | COMP_CSR_INMESEL,
               tmp_csr
              );
#else
    MODIFY_REG(hcomp->Instance->CSR,
               COMP_CSR_PWRMODE  | COMP_CSR_INMSEL   | COMP_CSR_INPSEL  |
                                   COMP_CSR_POLARITY | COMP_CSR_HYST    |
               COMP_CSR_BLANKING | COMP_CSR_BRGEN    | COMP_CSR_SCALEN  | COMP_CSR_INMESEL,
               tmp_csr
              );
#endif
#else
    MODIFY_REG(hcomp->Instance->CSR,
               COMP_CSR_PWRMODE  | COMP_CSR_INMSEL   | COMP_CSR_INPSEL  |
               COMP_CSR_WINMODE  | COMP_CSR_POLARITY | COMP_CSR_HYST    |
               COMP_CSR_BLANKING | COMP_CSR_BRGEN    | COMP_CSR_SCALEN,
               tmp_csr
              );
#endif

#if defined(COMP2)
    /* Set window mode */
    /* Note: Window mode bit is located into 1 out of the 2 pairs of COMP     */
    /*       instances. Therefore, this function can update another COMP      */
    /*       instance that the one currently selected.                        */
    if(hcomp->Init.WindowMode == COMP_WINDOWMODE_COMP1_INPUT_PLUS_COMMON)
    {
      SET_BIT(COMP12_COMMON->CSR, COMP_CSR_WINMODE);
    }
    else
    {
      CLEAR_BIT(COMP12_COMMON->CSR, COMP_CSR_WINMODE);
    }
#endif /* COMP2 */

    /* Delay for COMP scaler bridge voltage stabilization */
    /* Apply the delay if voltage scaler bridge is required and not already enabled */
    if ((READ_BIT(hcomp->Instance->CSR, COMP_CSR_SCALEN) != 0UL) &&
        (comp_voltage_scaler_initialized == 0UL)               )
    {
      /* Wait loop initialization and execution */
      /* Note: Variable divided by 2 to compensate partially              */
      /*       CPU processing cycles, scaling in us split to not          */
      /*       exceed 32 bits register capacity and handle low frequency. */
      wait_loop_index = ((COMP_DELAY_VOLTAGE_SCALER_STAB_US / 10UL) * (SystemCoreClock / (100000UL * 2UL)));
      while(wait_loop_index != 0UL)
      {
        wait_loop_index--;
      }
    }

    /* Get the EXTI line corresponding to the selected COMP instance */
    exti_line = COMP_GET_EXTI_LINE(hcomp->Instance);

    /* Manage EXTI settings */
    if((hcomp->Init.TriggerMode & (COMP_EXTI_IT | COMP_EXTI_EVENT)) != 0UL)
    {
      /* Configure EXTI rising edge */
      if((hcomp->Init.TriggerMode & COMP_EXTI_RISING) != 0UL)
      {
        LL_EXTI_EnableRisingTrig_0_31(exti_line);
      }
      else
      {
        LL_EXTI_DisableRisingTrig_0_31(exti_line);
      }

      /* Configure EXTI falling edge */
      if((hcomp->Init.TriggerMode & COMP_EXTI_FALLING) != 0UL)
      {
        LL_EXTI_EnableFallingTrig_0_31(exti_line);
      }
      else
      {
        LL_EXTI_DisableFallingTrig_0_31(exti_line);
      }

      /* Clear COMP EXTI pending bit (if any) */
      LL_EXTI_ClearFlag_0_31(exti_line);

      /* Configure EXTI event mode */
      if((hcomp->Init.TriggerMode & COMP_EXTI_EVENT) != 0UL)
      {
        LL_EXTI_EnableEvent_0_31(exti_line);
      }
      else
      {
        LL_EXTI_DisableEvent_0_31(exti_line);
      }

      /* Configure EXTI interrupt mode */
      if((hcomp->Init.TriggerMode & COMP_EXTI_IT) != 0UL)
      {
        LL_EXTI_EnableIT_0_31(exti_line);
      }
      else
      {
        LL_EXTI_DisableIT_0_31(exti_line);
      }
    }
    else
    {
      /* Disable EXTI event mode */
      LL_EXTI_DisableEvent_0_31(exti_line);

      /* Disable EXTI interrupt mode */
      LL_EXTI_DisableIT_0_31(exti_line);
    }

    /* Set HAL COMP handle state */
    /* Note: Transition from state reset to state ready,                      */
    /*       otherwise (coming from state ready or busy) no state update.     */
    if (hcomp->State == HAL_COMP_STATE_RESET)
    {
      hcomp->State = HAL_COMP_STATE_READY;
    }
  }

  return status;
}

HAL_StatusTypeDef HAL_COMP_DeInit(COMP_HandleTypeDef *hcomp)
{
  HAL_StatusTypeDef status = HAL_OK;

  /* Check the COMP handle allocation and lock status */
  if(hcomp == NULL)
  {
    status = HAL_ERROR;
  }
  else if(__HAL_COMP_IS_LOCKED(hcomp))
  {
    status = HAL_ERROR;
  }
  else
  {
    /* Check the parameter */
    assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));

    /* Set COMP_CSR register to reset value */
    WRITE_REG(hcomp->Instance->CSR, 0x00000000UL);

#if (USE_HAL_COMP_REGISTER_CALLBACKS == 1)
    if (hcomp->MspDeInitCallback == NULL)
    {
      hcomp->MspDeInitCallback = HAL_COMP_MspDeInit; /* Legacy weak MspDeInit  */
    }

    /* DeInit the low level hardware: GPIO, RCC clock, NVIC */
    hcomp->MspDeInitCallback(hcomp);
#else
    /* DeInit the low level hardware: GPIO, RCC clock, NVIC */
    HAL_COMP_MspDeInit(hcomp);
#endif /* USE_HAL_COMP_REGISTER_CALLBACKS */

    /* Set HAL COMP handle state */
    hcomp->State = HAL_COMP_STATE_RESET;

    /* Release Lock */
    __HAL_UNLOCK(hcomp);
  }

  return status;
}

__weak void HAL_COMP_MspInit(COMP_HandleTypeDef *hcomp)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hcomp);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_COMP_MspInit could be implemented in the user file
   */
}

__weak void HAL_COMP_MspDeInit(COMP_HandleTypeDef *hcomp)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hcomp);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_COMP_MspDeInit could be implemented in the user file
   */
}

#if (USE_HAL_COMP_REGISTER_CALLBACKS == 1)

HAL_StatusTypeDef HAL_COMP_RegisterCallback(COMP_HandleTypeDef *hcomp, HAL_COMP_CallbackIDTypeDef CallbackID, pCOMP_CallbackTypeDef pCallback)
{
  HAL_StatusTypeDef status = HAL_OK;

  if (pCallback == NULL)
  {
    /* Update the error code */
    hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

    return HAL_ERROR;
  }

  if (HAL_COMP_STATE_READY == hcomp->State)
  {
    switch (CallbackID)
    {
      case HAL_COMP_TRIGGER_CB_ID :
        hcomp->TriggerCallback = pCallback;
        break;

      case HAL_COMP_MSPINIT_CB_ID :
        hcomp->MspInitCallback = pCallback;
        break;

      case HAL_COMP_MSPDEINIT_CB_ID :
        hcomp->MspDeInitCallback = pCallback;
        break;

      default :
        /* Update the error code */
        hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

        /* Return error status */
        status = HAL_ERROR;
        break;
    }
  }
  else if (HAL_COMP_STATE_RESET == hcomp->State)
  {
    switch (CallbackID)
    {
      case HAL_COMP_MSPINIT_CB_ID :
        hcomp->MspInitCallback = pCallback;
        break;

      case HAL_COMP_MSPDEINIT_CB_ID :
        hcomp->MspDeInitCallback = pCallback;
        break;

      default :
        /* Update the error code */
        hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

        /* Return error status */
        status = HAL_ERROR;
        break;
    }
  }
  else
  {
    /* Update the error code */
    hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

    /* Return error status */
    status =  HAL_ERROR;
  }

  return status;
}

HAL_StatusTypeDef HAL_COMP_UnRegisterCallback(COMP_HandleTypeDef *hcomp, HAL_COMP_CallbackIDTypeDef CallbackID)
{
  HAL_StatusTypeDef status = HAL_OK;

  if (HAL_COMP_STATE_READY == hcomp->State)
  {
    switch (CallbackID)
    {
      case HAL_COMP_TRIGGER_CB_ID :
        hcomp->TriggerCallback = HAL_COMP_TriggerCallback;         /* Legacy weak callback */
        break;

      case HAL_COMP_MSPINIT_CB_ID :
        hcomp->MspInitCallback = HAL_COMP_MspInit;                 /* Legacy weak MspInit */
        break;

      case HAL_COMP_MSPDEINIT_CB_ID :
        hcomp->MspDeInitCallback = HAL_COMP_MspDeInit;             /* Legacy weak MspDeInit */
        break;

      default :
        /* Update the error code */
        hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

        /* Return error status */
        status =  HAL_ERROR;
        break;
    }
  }
  else if (HAL_COMP_STATE_RESET == hcomp->State)
  {
    switch (CallbackID)
    {
      case HAL_COMP_MSPINIT_CB_ID :
        hcomp->MspInitCallback = HAL_COMP_MspInit;                 /* Legacy weak MspInit */
        break;

      case HAL_COMP_MSPDEINIT_CB_ID :
        hcomp->MspDeInitCallback = HAL_COMP_MspDeInit;             /* Legacy weak MspDeInit */
        break;

      default :
        /* Update the error code */
        hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

        /* Return error status */
        status =  HAL_ERROR;
        break;
    }
  }
  else
  {
    /* Update the error code */
    hcomp->ErrorCode |= HAL_COMP_ERROR_INVALID_CALLBACK;

    /* Return error status */
    status =  HAL_ERROR;
  }

  return status;
}

#endif /* USE_HAL_COMP_REGISTER_CALLBACKS */

HAL_StatusTypeDef HAL_COMP_Start(COMP_HandleTypeDef *hcomp)
{
  __IO uint32_t wait_loop_index = 0UL;
  HAL_StatusTypeDef status = HAL_OK;

  /* Check the COMP handle allocation and lock status */
  if(hcomp == NULL)
  {
    status = HAL_ERROR;
  }
  else if(__HAL_COMP_IS_LOCKED(hcomp))
  {
    status = HAL_ERROR;
  }
  else
  {
    /* Check the parameter */
    assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));

    if(hcomp->State == HAL_COMP_STATE_READY)
    {
      /* Enable the selected comparator */
      SET_BIT(hcomp->Instance->CSR, COMP_CSR_EN);

      /* Set HAL COMP handle state */
      hcomp->State = HAL_COMP_STATE_BUSY;

      /* Delay for COMP startup time */
      /* Wait loop initialization and execution */
      /* Note: Variable divided by 2 to compensate partially              */
      /*       CPU processing cycles, scaling in us split to not          */
      /*       exceed 32 bits register capacity and handle low frequency. */
      wait_loop_index = ((COMP_DELAY_STARTUP_US / 10UL) * (SystemCoreClock / (100000UL * 2UL)));
      while(wait_loop_index != 0UL)
      {
        wait_loop_index--;
      }
    }
    else
    {
      status = HAL_ERROR;
    }
  }

  return status;
}

HAL_StatusTypeDef HAL_COMP_Stop(COMP_HandleTypeDef *hcomp)
{
  HAL_StatusTypeDef status = HAL_OK;

  /* Check the COMP handle allocation and lock status */
  if(hcomp == NULL)
  {
    status = HAL_ERROR;
  }
  else if(__HAL_COMP_IS_LOCKED(hcomp))
  {
    status = HAL_ERROR;
  }
  else
  {
    /* Check the parameter */
    assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));

    /* Check compliant states: HAL_COMP_STATE_READY or HAL_COMP_STATE_BUSY    */
    /* (all states except HAL_COMP_STATE_RESET and except locked status.      */
    if(hcomp->State != HAL_COMP_STATE_RESET)
    {
      /* Disable the selected comparator */
      CLEAR_BIT(hcomp->Instance->CSR, COMP_CSR_EN);

      /* Set HAL COMP handle state */
      hcomp->State = HAL_COMP_STATE_READY;
    }
    else
    {
      status = HAL_ERROR;
    }
  }

  return status;
}

void HAL_COMP_IRQHandler(COMP_HandleTypeDef *hcomp)
{
  /* Get the EXTI line corresponding to the selected COMP instance */
  uint32_t exti_line = COMP_GET_EXTI_LINE(hcomp->Instance);

  /* Check COMP EXTI flag */
  if(LL_EXTI_IsActiveFlag_0_31(exti_line) != 0UL)
  {
#if defined(COMP2)
    /* Check whether comparator is in independent or window mode */
    if(READ_BIT(COMP12_COMMON->CSR, COMP_CSR_WINMODE) != RESET)
    {
      /* Clear COMP EXTI line pending bit of the pair of comparators          */
      /* in window mode.                                                      */
      /* Note: Pair of comparators in window mode can both trig IRQ when      */
      /*       input voltage is changing from "out of window" area            */
      /*       (low or high ) to the other "out of window" area (high or low).*/
      /*       Both flags must be cleared to call comparator trigger          */
      /*       callback is called once.                                       */
      LL_EXTI_ClearFlag_0_31((COMP_EXTI_LINE_COMP1 | COMP_EXTI_LINE_COMP2));
    }
    else
#endif /* COMP2 */
    {
      /* Clear COMP EXTI line pending bit */
      LL_EXTI_ClearFlag_0_31(exti_line);
    }

    /* COMP trigger user callback */
#if (USE_HAL_COMP_REGISTER_CALLBACKS == 1)
    hcomp->TriggerCallback(hcomp);
#else
    HAL_COMP_TriggerCallback(hcomp);
#endif /* USE_HAL_COMP_REGISTER_CALLBACKS */
  }
}

HAL_StatusTypeDef HAL_COMP_Lock(COMP_HandleTypeDef *hcomp)
{
  HAL_StatusTypeDef status = HAL_OK;

  /* Check the COMP handle allocation and lock status */
  if(hcomp == NULL)
  {
    status = HAL_ERROR;
  }
  else if(__HAL_COMP_IS_LOCKED(hcomp))
  {
    status = HAL_ERROR;
  }
  else
  {
    /* Check the parameter */
    assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));

    /* Set HAL COMP handle state */
    switch(hcomp->State)
    {
      case HAL_COMP_STATE_RESET:
        hcomp->State = HAL_COMP_STATE_RESET_LOCKED;
        break;
      case HAL_COMP_STATE_READY:
        hcomp->State = HAL_COMP_STATE_READY_LOCKED;
        break;
      default: /* HAL_COMP_STATE_BUSY */
        hcomp->State = HAL_COMP_STATE_BUSY_LOCKED;
        break;
    }
  }

  if(status == HAL_OK)
  {
    /* Set the lock bit corresponding to selected comparator */
    __HAL_COMP_LOCK(hcomp);
  }

  return status;
}

uint32_t HAL_COMP_GetOutputLevel(COMP_HandleTypeDef *hcomp)
{
  /* Check the parameter */
  assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));

  return (uint32_t)(READ_BIT(hcomp->Instance->CSR, COMP_CSR_VALUE)
                    >> COMP_OUTPUT_LEVEL_BITOFFSET_POS);
}

__weak void HAL_COMP_TriggerCallback(COMP_HandleTypeDef *hcomp)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hcomp);

  /* NOTE : This function should not be modified, when the callback is needed,
            the HAL_COMP_TriggerCallback should be implemented in the user file
   */
}


HAL_COMP_StateTypeDef HAL_COMP_GetState(COMP_HandleTypeDef *hcomp)
{
  /* Check the COMP handle allocation */
  if(hcomp == NULL)
  {
    return HAL_COMP_STATE_RESET;
  }

  /* Check the parameter */
  assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));

  /* Return HAL COMP handle state */
  return hcomp->State;
}

uint32_t HAL_COMP_GetError(COMP_HandleTypeDef *hcomp)
{
  /* Check the parameters */
  assert_param(IS_COMP_ALL_INSTANCE(hcomp->Instance));

  return hcomp->ErrorCode;
}

#endif /* COMP1 || COMP2 */

#endif /* HAL_COMP_MODULE_ENABLED */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/