stm32l4xx_hal_exti.c

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

#ifdef HAL_EXTI_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private defines ------------------------------------------------------------*/
#define EXTI_MODE_OFFSET                    0x08u   /* 0x20: offset between MCU IMR/EMR registers */
#define EXTI_CONFIG_OFFSET                  0x08u   /* 0x20: offset between MCU Rising/Falling configuration registers */

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

HAL_StatusTypeDef HAL_EXTI_SetConfigLine(EXTI_HandleTypeDef *hexti, EXTI_ConfigTypeDef *pExtiConfig)
{
  __IO uint32_t *regaddr;
  uint32_t regval;
  uint32_t linepos;
  uint32_t maskline;
  uint32_t offset;

  /* Check null pointer */
  if ((hexti == NULL) || (pExtiConfig == NULL))
  {
    return HAL_ERROR;
  }

  /* Check parameters */
  assert_param(IS_EXTI_LINE(pExtiConfig->Line));
  assert_param(IS_EXTI_MODE(pExtiConfig->Mode));

  /* Assign line number to handle */
  hexti->Line = pExtiConfig->Line;

  /* Compute line register offset and line mask */
  offset = ((pExtiConfig->Line & EXTI_REG_MASK) >> EXTI_REG_SHIFT);
  linepos = (pExtiConfig->Line & EXTI_PIN_MASK);
  maskline = (1uL << linepos);

  /* Configure triggers for configurable lines */
  if ((pExtiConfig->Line & EXTI_CONFIG) != 0x00u)
  {
    assert_param(IS_EXTI_TRIGGER(pExtiConfig->Trigger));

    /* Configure rising trigger */
    regaddr = (&EXTI->RTSR1 + (EXTI_CONFIG_OFFSET * offset));
    regval = *regaddr;

    /* Mask or set line */
    if ((pExtiConfig->Trigger & EXTI_TRIGGER_RISING) != 0x00u)
    {
      regval |= maskline;
    }
    else
    {
      regval &= ~maskline;
    }

    /* Store rising trigger mode */
    *regaddr = regval;

    /* Configure falling trigger */
    regaddr = (&EXTI->FTSR1 + (EXTI_CONFIG_OFFSET * offset));
    regval = *regaddr;

    /* Mask or set line */
    if ((pExtiConfig->Trigger & EXTI_TRIGGER_FALLING) != 0x00u)
    {
      regval |= maskline;
    }
    else
    {
      regval &= ~maskline;
    }

    /* Store falling trigger mode */
    *regaddr = regval;

    /* Configure gpio port selection in case of gpio exti line */
    if ((pExtiConfig->Line & EXTI_GPIO) == EXTI_GPIO)
    {
      assert_param(IS_EXTI_GPIO_PORT(pExtiConfig->GPIOSel));
      assert_param(IS_EXTI_GPIO_PIN(linepos));

      regval = SYSCFG->EXTICR[linepos >> 2u];
      regval &= ~(SYSCFG_EXTICR1_EXTI0 << (SYSCFG_EXTICR1_EXTI1_Pos * (linepos & 0x03u)));
      regval |= (pExtiConfig->GPIOSel << (SYSCFG_EXTICR1_EXTI1_Pos * (linepos & 0x03u)));
      SYSCFG->EXTICR[linepos >> 2u] = regval;
    }
  }

  /* Configure interrupt mode : read current mode */
  regaddr = (&EXTI->IMR1 + (EXTI_MODE_OFFSET * offset));
  regval = *regaddr;

  /* Mask or set line */
  if ((pExtiConfig->Mode & EXTI_MODE_INTERRUPT) != 0x00u)
  {
    regval |= maskline;
  }
  else
  {
    regval &= ~maskline;
  }

  /* Store interrupt mode */
  *regaddr = regval;

  /* The event mode cannot be configured if the line does not support it */
  assert_param(((pExtiConfig->Line & EXTI_EVENT) == EXTI_EVENT) || ((pExtiConfig->Mode & EXTI_MODE_EVENT) != EXTI_MODE_EVENT));

  /* Configure event mode : read current mode */
  regaddr = (&EXTI->EMR1 + (EXTI_MODE_OFFSET * offset));
  regval = *regaddr;

  /* Mask or set line */
  if ((pExtiConfig->Mode & EXTI_MODE_EVENT) != 0x00u)
  {
    regval |= maskline;
  }
  else
  {
    regval &= ~maskline;
  }

  /* Store event mode */
  *regaddr = regval;

  return HAL_OK;
}


HAL_StatusTypeDef HAL_EXTI_GetConfigLine(EXTI_HandleTypeDef *hexti, EXTI_ConfigTypeDef *pExtiConfig)
{
  __IO uint32_t *regaddr;
  uint32_t regval;
  uint32_t linepos;
  uint32_t maskline;
  uint32_t offset;

  /* Check null pointer */
  if ((hexti == NULL) || (pExtiConfig == NULL))
  {
    return HAL_ERROR;
  }

  /* Check the parameter */
  assert_param(IS_EXTI_LINE(hexti->Line));

  /* Store handle line number to configuration structure */
  pExtiConfig->Line = hexti->Line;

  /* Compute line register offset and line mask */
  offset = ((pExtiConfig->Line & EXTI_REG_MASK) >> EXTI_REG_SHIFT);
  linepos = (pExtiConfig->Line & EXTI_PIN_MASK);
  maskline = (1uL << linepos);

  /* 1] Get core mode : interrupt */
  regaddr = (&EXTI->IMR1 + (EXTI_MODE_OFFSET * offset));
  regval = *regaddr;

  /* Check if selected line is enable */
  if ((regval & maskline) != 0x00u)
  {
    pExtiConfig->Mode = EXTI_MODE_INTERRUPT;
  }
  else
  {
    pExtiConfig->Mode = EXTI_MODE_NONE;
  }

  /* Get event mode */
  regaddr = (&EXTI->EMR1 + (EXTI_MODE_OFFSET * offset));
  regval = *regaddr;

  /* Check if selected line is enable */
  if ((regval & maskline) != 0x00u)
  {
    pExtiConfig->Mode |= EXTI_MODE_EVENT;
  }

  /* 2] Get trigger for configurable lines : rising */
  if ((pExtiConfig->Line & EXTI_CONFIG) != 0x00u)
  {
    regaddr = (&EXTI->RTSR1 + (EXTI_CONFIG_OFFSET * offset));
    regval = *regaddr;

    /* Check if configuration of selected line is enable */
    if ((regval & maskline) != 0x00u)
    {
      pExtiConfig->Trigger = EXTI_TRIGGER_RISING;
    }
    else
    {
      pExtiConfig->Trigger = EXTI_TRIGGER_NONE;
    }

    /* Get falling configuration */
    regaddr = (&EXTI->FTSR1 + (EXTI_CONFIG_OFFSET * offset));
    regval = *regaddr;

    /* Check if configuration of selected line is enable */
    if ((regval & maskline) != 0x00u)
    {
      pExtiConfig->Trigger |= EXTI_TRIGGER_FALLING;
    }

    /* Get Gpio port selection for gpio lines */
    if ((pExtiConfig->Line & EXTI_GPIO) == EXTI_GPIO)
    {
      assert_param(IS_EXTI_GPIO_PIN(linepos));

      regval = SYSCFG->EXTICR[linepos >> 2u];
      pExtiConfig->GPIOSel = ((regval << (SYSCFG_EXTICR1_EXTI1_Pos * (3uL - (linepos & 0x03u)))) >> 24);
    }
    else
    {
      pExtiConfig->GPIOSel = 0x00u;
    }
  }
  else
  {
    pExtiConfig->Trigger = EXTI_TRIGGER_NONE;
    pExtiConfig->GPIOSel = 0x00u;
  }

  return HAL_OK;
}


HAL_StatusTypeDef HAL_EXTI_ClearConfigLine(EXTI_HandleTypeDef *hexti)
{
  __IO uint32_t *regaddr;
  uint32_t regval;
  uint32_t linepos;
  uint32_t maskline;
  uint32_t offset;

  /* Check null pointer */
  if (hexti == NULL)
  {
    return HAL_ERROR;
  }

  /* Check the parameter */
  assert_param(IS_EXTI_LINE(hexti->Line));

  /* compute line register offset and line mask */
  offset = ((hexti->Line & EXTI_REG_MASK) >> EXTI_REG_SHIFT);
  linepos = (hexti->Line & EXTI_PIN_MASK);
  maskline = (1uL << linepos);

  /* 1] Clear interrupt mode */
  regaddr = (&EXTI->IMR1 + (EXTI_MODE_OFFSET * offset));
  regval = (*regaddr & ~maskline);
  *regaddr = regval;

  /* 2] Clear event mode */
  regaddr = (&EXTI->EMR1 + (EXTI_MODE_OFFSET * offset));
  regval = (*regaddr & ~maskline);
  *regaddr = regval;

  /* 3] Clear triggers in case of configurable lines */
  if ((hexti->Line & EXTI_CONFIG) != 0x00u)
  {
    regaddr = (&EXTI->RTSR1 + (EXTI_CONFIG_OFFSET * offset));
    regval = (*regaddr & ~maskline);
    *regaddr = regval;

    regaddr = (&EXTI->FTSR1 + (EXTI_CONFIG_OFFSET * offset));
    regval = (*regaddr & ~maskline);
    *regaddr = regval;

    /* Get Gpio port selection for gpio lines */
    if ((hexti->Line & EXTI_GPIO) == EXTI_GPIO)
    {
      assert_param(IS_EXTI_GPIO_PIN(linepos));

      regval = SYSCFG->EXTICR[linepos >> 2u];
      regval &= ~(SYSCFG_EXTICR1_EXTI0 << (SYSCFG_EXTICR1_EXTI1_Pos * (linepos & 0x03u)));
      SYSCFG->EXTICR[linepos >> 2u] = regval;
    }
  }

  return HAL_OK;
}


HAL_StatusTypeDef HAL_EXTI_RegisterCallback(EXTI_HandleTypeDef *hexti, EXTI_CallbackIDTypeDef CallbackID, void (*pPendingCbfn)(void))
{
  HAL_StatusTypeDef status = HAL_OK;

  switch (CallbackID)
  {
    case  HAL_EXTI_COMMON_CB_ID:
      hexti->PendingCallback = pPendingCbfn;
      break;

    default:
      status = HAL_ERROR;
      break;
  }

  return status;
}


HAL_StatusTypeDef HAL_EXTI_GetHandle(EXTI_HandleTypeDef *hexti, uint32_t ExtiLine)
{
  /* Check the parameters */
  assert_param(IS_EXTI_LINE(ExtiLine));

  /* Check null pointer */
  if (hexti == NULL)
  {
    return HAL_ERROR;
  }
  else
  {
    /* Store line number as handle private field */
    hexti->Line = ExtiLine;

    return HAL_OK;
  }
}


void HAL_EXTI_IRQHandler(EXTI_HandleTypeDef *hexti)
{
  __IO uint32_t *regaddr;
  uint32_t regval;
  uint32_t maskline;
  uint32_t offset;

  /* Compute line register offset and line mask */
  offset = ((hexti->Line & EXTI_REG_MASK) >> EXTI_REG_SHIFT);
  maskline = (1uL << (hexti->Line & EXTI_PIN_MASK));

  /* Get pending bit  */
  regaddr = (&EXTI->PR1 + (EXTI_CONFIG_OFFSET * offset));
  regval = (*regaddr & maskline);

  if (regval != 0x00u)
  {
    /* Clear pending bit */
    *regaddr = maskline;

    /* Call callback */
    if (hexti->PendingCallback != NULL)
    {
      hexti->PendingCallback();
    }
  }
}


uint32_t HAL_EXTI_GetPending(EXTI_HandleTypeDef *hexti, uint32_t Edge)
{
  __IO uint32_t *regaddr;
  uint32_t regval;
  uint32_t linepos;
  uint32_t maskline;
  uint32_t offset;

  /* Check parameters */
  assert_param(IS_EXTI_LINE(hexti->Line));
  assert_param(IS_EXTI_CONFIG_LINE(hexti->Line));
  assert_param(IS_EXTI_PENDING_EDGE(Edge));

  /* Compute line register offset and line mask */
  offset = ((hexti->Line & EXTI_REG_MASK) >> EXTI_REG_SHIFT);
  linepos = (hexti->Line & EXTI_PIN_MASK);
  maskline = (1uL << linepos);

  /* Get pending bit */
  regaddr = (&EXTI->PR1 + (EXTI_CONFIG_OFFSET * offset));

  /* return 1 if bit is set else 0 */
  regval = ((*regaddr & maskline) >> linepos);
  return regval;
}


void HAL_EXTI_ClearPending(EXTI_HandleTypeDef *hexti, uint32_t Edge)
{
  __IO uint32_t *regaddr;
  uint32_t maskline;
  uint32_t offset;

  /* Check parameters */
  assert_param(IS_EXTI_LINE(hexti->Line));
  assert_param(IS_EXTI_CONFIG_LINE(hexti->Line));
  assert_param(IS_EXTI_PENDING_EDGE(Edge));

  /* compute line register offset and line mask */
  offset = ((hexti->Line & EXTI_REG_MASK) >> EXTI_REG_SHIFT);
  maskline = (1uL << (hexti->Line & EXTI_PIN_MASK));

  /* Get pending register address */
  regaddr = (&EXTI->PR1 + (EXTI_CONFIG_OFFSET * offset));

  /* Clear Pending bit */
  *regaddr =  maskline;
}


void HAL_EXTI_GenerateSWI(EXTI_HandleTypeDef *hexti)
{
  __IO uint32_t *regaddr;
  uint32_t maskline;
  uint32_t offset;

  /* Check parameters */
  assert_param(IS_EXTI_LINE(hexti->Line));
  assert_param(IS_EXTI_CONFIG_LINE(hexti->Line));

  /* compute line register offset and line mask */
  offset = ((hexti->Line & EXTI_REG_MASK) >> EXTI_REG_SHIFT);
  maskline = (1uL << (hexti->Line & EXTI_PIN_MASK));

  regaddr = (&EXTI->SWIER1 + (EXTI_CONFIG_OFFSET * offset));
  *regaddr = maskline;
}


#endif /* HAL_EXTI_MODULE_ENABLED */

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