关于GPIO口外部中断的设置问题（型号：TM4C123G）

PE3出发的也是PORTE的中断，然后进入中断后读取：

ulIntSta = GPIOIntStatus(GPIO_PORTE_BASE, false);

判断ulIntSta 的值。如果是PE3，则ulIntSta 会等于GPIO_PIN_3

看一下库函数吧：

//*****************************************************************************
//
//! Gets interrupt status for the specified GPIO port.
//!
//! \param ui32Port is the base address of the GPIO port.
//! \param bMasked specifies whether masked or raw interrupt status is
//! returned.
//!
//! If \e bMasked is set as \b true, then the masked interrupt status is
//! returned; otherwise, the raw interrupt status is returned.
//!
//! \return Returns the current interrupt status for the specified GPIO module.
//! The value returned is the logical OR of the \b GPIO_INT_* values that are
//! currently active.
//
//*****************************************************************************
uint32_t
GPIOIntStatus(uint32_t ui32Port, bool bMasked)
{
//
// Check the arguments.
//
ASSERT(_GPIOBaseValid(ui32Port));

//
// Return the interrupt status.
//
if(bMasked)
{
return(HWREG(ui32Port + GPIO_O_MIS));
}
else
{
return(HWREG(ui32Port + GPIO_O_RIS));
}
}