/**
* @brief Clears the EXTI's line pending bits.
* @param EXTI_Line: specifies the EXTI lines to clear.
* This parameter can be any combination of EXTI_Linex where x can be (0..19).
* @retval None
*/
void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
{
/* Check the parameters */
assert_param(IS_EXTI_LINE(EXTI_Line));
EXTI->PR = EXTI_Line;
}
/**
* @brief Generates a Software interrupt.
* @param EXTI_Line: specifies the EXTI lines to be enabled or disabled.
* This parameter can be any combination of EXTI_Linex where x can be (0..19).
* @retval None
*/
void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
{
/* Check the parameters */
assert_param(IS_EXTI_LINE(EXTI_Line));
EXTI->SWIER |= EXTI_Line;
}
/*******************************************************************************
* Function Name : EXTI_ClearFlag
* Description : Clears the EXTI’s line pending flags.
* Input : - EXTI_Line: specifies the EXTI lines flags to clear.
* This parameter can be any combination of EXTI_Linex where
* x can be (0..18).
* Output : None
* Return : None
*******************************************************************************/
void EXTI_ClearFlag(u32 EXTI_Line)
{
/* Check the parameters */
assert_param(IS_EXTI_LINE(EXTI_Line));
EXTI->PR = EXTI_Line;
}
/*******************************************************************************
* Function Name : EXTI_Init
* Description : Initializes the EXTI peripheral according to the specified
* parameters in the EXTI_InitStruct.
* Input : - EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
* that contains the configuration information for the EXTI
* peripheral.
* Output : None
* Return : None
*******************************************************************************/
void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
{
/* Check the parameters */
assert(IS_EXTI_MODE(EXTI_InitStruct->EXTI_Mode));
assert(IS_EXTI_TRIGGER(EXTI_InitStruct->EXTI_Trigger));
assert(IS_EXTI_LINE(EXTI_InitStruct->EXTI_Line));
assert(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd));
if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
{
*(u32 *)(EXTI_BASE + (u32)EXTI_InitStruct->EXTI_Mode)|= EXTI_InitStruct->EXTI_Line;
/* Clear Rising Falling edge configuration */
EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line;
EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line;
/* Select the trigger for the selected external interrupts */
if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
{
/* Rising Falling edge */
EXTI->RTSR |= EXTI_InitStruct->EXTI_Line;
EXTI->FTSR |= EXTI_InitStruct->EXTI_Line;
}
else
{
*(u32 *)(EXTI_BASE + (u32)EXTI_InitStruct->EXTI_Trigger)|= EXTI_InitStruct->EXTI_Line;
}
}
else
{
/* Disable the selected external lines */
*(u32 *)(EXTI_BASE + (u32)EXTI_InitStruct->EXTI_Mode)&= ~EXTI_InitStruct->EXTI_Line;
}
}
/**
* @brief Generates a Software interrupt on selected EXTI line.
* @param EXTI_Line: specifies the EXTI line on which the software interrupt
* will be generated.
* This parameter can be any combination of EXTI_Linex where x can be (0..22)
* @retval None
*/
void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
{
/* Check the parameters */
uint32_t irq_flag;
irq_flag = local_irq_save();
assert_param(IS_EXTI_LINE(EXTI_Line));
EXTI->SWIER |= EXTI_Line;
local_irq_restore(irq_flag);
}
/**
* @brief Initializes the EXTI peripheral according to the specified
* parameters in the EXTI_InitStruct.
* @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
* that contains the configuration information for the EXTI peripheral.
* @retval None
*/
void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
{
uint32_t tmp = 0;
uint32_t irq_flag;
irq_flag = local_irq_save();
/* Check the parameters */
assert_param(IS_EXTI_MODE(EXTI_InitStruct->EXTI_Mode));
assert_param(IS_EXTI_TRIGGER(EXTI_InitStruct->EXTI_Trigger));
assert_param(IS_EXTI_LINE(EXTI_InitStruct->EXTI_Line));
assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd));
tmp = (uint32_t)EXTI_BASE;
if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
{
/* Clear EXTI line configuration */
EXTI->IMR &= ~EXTI_InitStruct->EXTI_Line;
EXTI->EMR &= ~EXTI_InitStruct->EXTI_Line;
tmp += EXTI_InitStruct->EXTI_Mode;
*(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
/* Clear Rising Falling edge configuration */
EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line;
EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line;
/* Select the trigger for the selected external interrupts */
if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
{
/* Rising Falling edge */
EXTI->RTSR |= EXTI_InitStruct->EXTI_Line;
EXTI->FTSR |= EXTI_InitStruct->EXTI_Line;
}
else
{
tmp = (uint32_t)EXTI_BASE;
tmp += EXTI_InitStruct->EXTI_Trigger;
*(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
}
}
else
{
tmp += EXTI_InitStruct->EXTI_Mode;
/* Disable the selected external lines */
*(__IO uint32_t *) tmp &= ~EXTI_InitStruct->EXTI_Line;
}
local_irq_restore(irq_flag);
}
