/**
  ******************************************************************************
  * @file stm8s_exti.c
  * @brief This file contains all the functions for the EXTI peripheral.
  * @author STMicroelectronics - MCD Application Team
  * @version V1.1.1
  * @date 06/05/2009
  ******************************************************************************
  *
  */

// Includes ------------------------------------------------------------------
#include "stm8s_exti.h"

// Private typedef -----------------------------------------------------------
// Private define ------------------------------------------------------------
// Private macro -------------------------------------------------------------
// Private variables ---------------------------------------------------------
// Private function prototypes -----------------------------------------------
// Private functions ---------------------------------------------------------

// Public functions ----------------------------------------------------------

  // * @addtogroup EXTI_Public_Functions

/**
  * @brief Deinitializes the external interrupt control registers to their default reset value.
  * @par Parameters:
  * None
  * @retval None
  */
void EXTI_DeInit(void)
{
    EXTI->CR1 = EXTI_CR1_RESET_VALUE;
    EXTI->CR2 = EXTI_CR2_RESET_VALUE;
}

/**
  * @brief Set the external interrupt sensitivity of the selected port.
  * @warning
  * - The modification of external interrupt sensitivity is only possible when the interrupts are disabled.
  * - The normal behavior is to disable the interrupts before calling this function, and re-enable them after.
  * @param[in] Port The port number to access.
  * @param[in] SensitivityValue The external interrupt sensitivity value to set.
  * @retval None
  * @par Required preconditions:
  * Global interrupts must be disabled before calling this function.
  */
void EXTI_SetExtIntSensitivity(EXTI_Port_TypeDef Port, EXTI_Sensitivity_TypeDef SensitivityValue)
{

    // Check function parameters 
    assert_param(IS_EXTI_PORT_OK(Port));
    assert_param(IS_EXTI_SENSITIVITY_OK(SensitivityValue));

    // Set external interrupt sensitivity 
    switch (Port)
    {
    case EXTI_PORT_GPIOA:
        EXTI->CR1 &= (u8)(~EXTI_CR1_PAIS);
        EXTI->CR1 |= (u8)(SensitivityValue);
        break;
    case EXTI_PORT_GPIOB:
        EXTI->CR1 &= (u8)(~EXTI_CR1_PBIS);
        EXTI->CR1 |= (u8)((u8)(SensitivityValue) << 2);
        break;
    case EXTI_PORT_GPIOC:
        EXTI->CR1 &= (u8)(~EXTI_CR1_PCIS);
        EXTI->CR1 |= (u8)((u8)(SensitivityValue) << 4);
        break;
    case EXTI_PORT_GPIOD:
        EXTI->CR1 &= (u8)(~EXTI_CR1_PDIS);
        EXTI->CR1 |= (u8)((u8)(SensitivityValue) << 6);
        break;
    case EXTI_PORT_GPIOE:
        EXTI->CR2 &= (u8)(~EXTI_CR2_PEIS);
        EXTI->CR2 |= (u8)(SensitivityValue);
        break;
    default:
        break;
    }
}

/**
  * @brief Set the TLI interrupt sensitivity.
  * @param[in] SensitivityValue The TLI interrupt sensitivity value.
  * @retval None
  * @par Required preconditions:
  * Global interrupts must be disabled before calling this function.
  */
void EXTI_SetTLISensitivity(EXTI_TLISensitivity_TypeDef SensitivityValue)
{

    // Check function parameters 
    assert_param(IS_EXTI_TLISENSITIVITY_OK(SensitivityValue));

    // Set TLI interrupt sensitivity 
    EXTI->CR2 &= (u8)(~EXTI_CR2_TLIS);
    EXTI->CR2 |= (u8)(SensitivityValue);

}

/**
  * @brief Get the external interrupt sensitivity of the selected port.
  * @param[in] Port The port number to access.
  * @retval EXTI_Sensitivity_TypeDef The external interrupt sensitivity of the selected port.
  */
EXTI_Sensitivity_TypeDef EXTI_GetExtIntSensitivity(EXTI_Port_TypeDef Port)
{

    u8 value = 0;

    // Check function parameters 
    assert_param(IS_EXTI_PORT_OK(Port));

    switch (Port)
    {
    case EXTI_PORT_GPIOA:
        value = (u8)(EXTI->CR1 & EXTI_CR1_PAIS);
        break;
    case EXTI_PORT_GPIOB:
        value = (u8)((EXTI->CR1 & EXTI_CR1_PBIS) >> 2);
        break;
    case EXTI_PORT_GPIOC:
        value = (u8)((EXTI->CR1 & EXTI_CR1_PCIS) >> 4);
        break;
    case EXTI_PORT_GPIOD:
        value = (u8)((EXTI->CR1 & EXTI_CR1_PDIS) >> 6);
        break;
    case EXTI_PORT_GPIOE:
        value = (u8)(EXTI->CR2 & EXTI_CR2_PEIS);
        break;
    default:
        break;
    }

    return((EXTI_Sensitivity_TypeDef)value);

}

/**
  * @brief Get the TLI interrupt sensitivity.
  * @par Parameters:
  * None
  * @retval EXTI_TLISensitivity_TypeDef The TLI interrupt sensitivity read.
  */
EXTI_TLISensitivity_TypeDef EXTI_GetTLISensitivity(void)
{

    u8 value;

    // Get TLI interrupt sensitivity 
    value = (u8)(EXTI->CR2 & EXTI_CR2_TLIS);

    return((EXTI_TLISensitivity_TypeDef)value);
}


