[技术问答] 关于外部中断奇特现象

/**************************************************************************//**

 * [url=home.php?mod=space&uid=288409]@file[/url]     gpio.c

 * [url=home.php?mod=space&uid=895143]@version[/url]  V3.00

 * $Revision: 2 $

 * $Date: 15/05/04 3:27p $

 * [url=home.php?mod=space&uid=247401]@brief[/url]    GPIO driver source file

 *

 * @note

 * Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.

*****************************************************************************/



#include "NUC100Series.h"



/** @addtogroup Standard_Driver Standard Driver

  @{

*/



/** @addtogroup GPIO_Driver GPIO Driver

  @{

*/



/** @addtogroup GPIO_EXPORTED_FUNCTIONS GPIO Exported Functions

  @{

*/



/**

 * @brief       Set GPIO operation mode

 *

 * @param[in]   port        GPIO port. It could be PA, PB, PC, PD, PE or PF.

 * @param[in]   u32PinMask  The single or multiple pins of specified GPIO port.

 *                          It could be BIT0 ~ BIT15 for PA, PB, PC, PD and PE GPIO port.

 *                          It could be BIT0 ~ BIT3 for PF GPIO port.

 * @param[in]   u32Mode     Operation mode. . It could be \n

 *                          GPIO_PMD_INPUT, GPIO_PMD_OUTPUT, GPIO_PMD_OPEN_DRAIN, GPIO_PMD_QUASI.

 *

 * [url=home.php?mod=space&uid=266161]@return[/url]      None

 *

 * [url=home.php?mod=space&uid=1543424]@Details[/url]     This function is used to set specified GPIO operation mode.

 */

void GPIO_SetMode(GPIO_T *port, uint32_t u32PinMask, uint32_t u32Mode)

{

    uint32_t i;



    for(i = 0; i < GPIO_PIN_MAX; i++)

    {

        if(u32PinMask & (1 << i))

        {

            port->PMD = (port->PMD & ~(0x3 << (i << 1))) | (u32Mode << (i << 1));

        }

    }

}



/**

 * @brief       Enable GPIO interrupt

 *

 * @param[in]   port            GPIO port. It could be PA, PB, PC, PD, PE or PF.

 * @param[in]   u32Pin          The pin of specified GPIO port.

 *                              It could be 0 ~ 15 for PA, PB, PC, PD and PE GPIO port.

 *                              It could be 0 ~ 3 for PF GPIO port.

 * @param[in]   u32IntAttribs   The interrupt attribute of specified GPIO pin. It could be \n

 *                              GPIO_INT_RISING, GPIO_INT_FALLING, GPIO_INT_BOTH_EDGE, GPIO_INT_HIGH, GPIO_INT_LOW.

 *

 * @return      None

 *

 * @details     This function is used to enable specified GPIO pin interrupt.

 */

void GPIO_EnableInt(GPIO_T *port, uint32_t u32Pin, uint32_t u32IntAttribs)

{

    port->IMD |= (((u32IntAttribs >> 24) & 0xFFUL) << u32Pin);

    port->IEN |= ((u32IntAttribs & 0xFFFFFFUL) << u32Pin);

}





/**

 * @brief       Disable GPIO interrupt

 *

 * @param[in]   port        GPIO port. It could be PA, PB, PC, PD, PE or PF.

 * @param[in]   u32Pin      The pin of specified GPIO port.

 *                          It could be 0 ~ 15 for PA, PB, PC, PD and PE GPIO port.

 *                          It could be 0 ~ 3 for PF GPIO port.

 *

 * @return      None

 *

 * @details     This function is used to enable specified GPIO pin interrupt.

 */

void GPIO_DisableInt(GPIO_T *port, uint32_t u32Pin)

{

    port->IMD &= ~(1UL << u32Pin);

    port->IEN &= ~((0x00010001UL) << u32Pin);

}





/*@}*/ /* end of group GPIO_EXPORTED_FUNCTIONS */



/*@}*/ /* end of group GPIO_Driver */



/*@}*/ /* end of group Device_Driver */



/*** (C) COPYRIGHT 2014 Nuvoton Technology Corp. ***/